(;GM[1]FF[3]
VW[]
SO[]
EV[]
PC[]SZ[19]HA[0]ST[0]
DT[13.9.2007]
KM[0]
GN[Kogo's Joseki, Jeongseok, Di`ngshi` Dictionary]
CP[see below]
GC[No commercial distribution.
Please, no non-commercial distribution without
permission and a link to the KJD webpage.
Contact kogo@waterfire.us. or kogo on KGS
Updates available at: http://waterfire.us/joseki.htm.

Copyright 2006-2007 by Andre Ay.
Copyright 1998-2005 by Gary Odom.
Portions copyright 2000-2001 by Stefan Verstraeten. 
]
C[
Kogo's Joseki, Jeongseok, Di`ngshi` Dictionary
-------------------------------------------------

Variation 1: 3-3 Point = San-san = Sam-sam = San-san
Variation 2: 3-4 Point = Komoku = Somok = Xiao~mu`
Variation 3: 4-4 Point = Hoshi = Hwajeom, Seongjeom = Xingwei`
Variation 4: 5-3 Point = Mokuhazushi = Waemok = Wai`mu`
Variation 5: 5-4 Point = Takamoku = Gomok = Gaomu`
Variation 6: 6-3 Point = Oomokuhazushi
Variation 7: 6-4 Point = Ootakamoku = Chaogao
Variation 8: 5-5 Point = Go-no-go = Wu~wu~
Variation 9: Reducing against 10-3


Choosing a joseki:
Since josekis work effectively in a certain direction, examine
positions at adjacent corners and sides before choosing a joseki.
The opposite corner matters only if a ladder is involved. Some
guidelines:
1. Have support for a fight - A high position provides support,
a low position does not.
2. Take the side with most value.
2a. A juncture point for both sides is of great value.
2b. A side where making territory is uncertain is of little value.
3. Consider strategic balance.
4. Get sente, if there are more big points on the board.
5. If there are two variations with similar outcome, but one
with a ladder and one without, avoid the ladder, because you
don't need to risk an opponent's ladder breaker.

How to learn joseki:
If you don't know joseki or a specific joseki, which you want
to learn, don't try to remember every single branching, you find
here. Look first for the main and correct variations, which are
marked out with a '*', and try to remember the most easy ones
of them. You don't need to know each branching you find here.
When you learn a joseki, look also for the follow-ups in the
middle- and end-game.
Use a new learned joseki in your real games, immediately after
you learned it, until you can vizualize it coming onto the board
in a rush, without trying to stress your memory in search of
each next joseki-move.
If something goes wrong or you want to know more, look up the
variations of deviations, special strategies, trick plays and
mistakes here. To understand, why there are only for special
situations or mistakes anytime, compare their results with the
results of good variations in nearby branchings instead of looking
at their results for themselves. Open this file twice to put
two results beside each other on your screen.

-----------------------------------------------------------------------------------------------

Known mistakes:
Some variation references are wrong,
If you find a mistake in the content, contact me.
]
(;B[qc]
C[
San-San = Sam-Sam = San-San = 3-3 Point
---------------------------------------------

The san-san (3-3) point, emphasizing territory at the expense
of influence (especially following an approach at 'a'). 

All joseki for the 3-3 point are relatively simple.

White approaches are 'a *' to 'c *'. White 'b *' to 'e' are played
when the top side is favored (such as an extension).
]
LB[pc:f][nc:e][od:d][nd:c][oc:b][pd:a]
(;W[pd]
C[
Kata-tsuki (shoulder hit)
--------------------------

The shoulder-hit is the traditional answer to the 3-3.

The direction of Black 3 depends on the positions on the side.

Crawling once may be the premise for a follow-up move of sliding
with a knight's move in the opposite direction. If Black plays
3 at 'a' (to the right), the follow-on knight's move is then
played at the top. Black's knight's move reduces territory potential
on the side it is played. 

Given a White stone at top, White 2 would be a mistake. In such
a case, White should have played an extension from that stone,
rather than White 2.

Black joseki continues with 'a *'. Black 'b' and 'c' show a special
strategy.

For variations of Black playing elsewhere, see the 4-4 point
branch.
]
LB[ob:c][oc:b][qd:a]
(;B[qd]C[White continues with 'a *' or 'b *'. White 'c' is a mistake.]
LB[pc:c][pf:b][pe:a]
(;W[pe]
C[Black continues with 'a *', 'b *' or 'c'. Black 'd' is seen occasionally
in amateur games.

Black 'a' and 'b' favor the top, while Black 'c' (and 'd') emphasize
the right side (to the potential sacrifice of giving White thickness
at the top).

Black 'e' and 'f' are not recommended.

Black 'g' shows Black playing elsewhere.

g7, f6, e5, d4, c3, b2, a1]
LB[dp:g][nc:f][oc:e][qe:d][qf:c][pc:b][ob:a]
(;B[ob]
C[White continues with 'a *' or 'b *'.
If there is already a Black stone on the marked position, 'b'
is wrong, and White must play 'a'. If there is already a White
stone, 'a' is wrong, and White must play 'b'.

White 'c' is a mistake, as White's stones are disconnected.

White 'd' shows a special strategy.

White 'e' shows White playing elsewhere.]
LB[dp:e][pj:d][nc:c][qe:b][md:a]TR[qj]
(;W[md]
C[
niken-tobi (1-space jump)
-------------------------

Black continues with 'a *' to 'c'. Black 'b' and 'c' are played
if Black wants to emphasize the top.

Black may also play elsewhere ('d').]
LB[dp:d][qf:c][nd:b][rf:a]
(;B[rf];W[ph]C[
* GOOD VARIATION *])

(;B[nd];W[ne];B[nc];W[me];B[lc];W[qe])

(;B[qf]C[White continues with 'a' or 'b'.]LB[og:b][qe:a]
(;W[qe];B[re];W[rf];B[rg];W[pf];B[qg];W[pc];B[pb];W[rd];B[sf];W[qb];
B[rc];W[rb];B[sd];W[nb];B[nc];W[mb];B[oc];W[nd])

(;W[og]C[Black continues with 'a', or plays elsewhere.]LB[dp:b][qg:a]
(;B[qg])

(;B[tt]C[Black plays elsewhere.];W[qg];B[rf])
)
)

(;B[tt]C[Black plays elsewhere.];W[qe]
C[Black continues locally with 'a' or 'b'. Black may also play
elsewhere ('c').]
LB[dp:c][nc:b][nd:a]
(;B[nd];W[ne];B[nc];W[mf];B[le];W[me];B[lc];W[ld];B[kc])

(;B[nc];W[nd];B[lc])

(;B[tt]C[Black plays elsewhere.

White continues with 'a' or 'b'.]
LB[mb:b][nc:a]
(;W[nc];B[nb];W[mb];B[oc];W[od];B[tt]C[Black plays elsewhere.];W[re];
B[rb])

(;W[mb];B[re];W[rf];B[rd])
)
)
)

(;W[qe]
C[White emphasizes the top with 6.

Black continues with 'a *' or 'b'.

'c' shows continuation when Black plays elsewhere.]
LB[dp:c][pi:b][nd:a]
(;B[nd]
C[Black 7 is absolutely necessary. 

White continues with 'a *'. White 'b', an amateur innovation,
is a trick play. White 'c' is also possible.]
LB[ne:c][nc:b][qi:a]
(;W[qi]C[
* GOOD VARIATION *])

(;W[nc]C[White 8 is a trick play.];B[oc];W[mc];B[od];W[qi]
C[Now Black may harass the two White stones, or play elsewhere.])

(;W[ne];B[me]C[White continues with 'a' or 'b'.]LB[nf:b][mf:a]
(;W[mf]C[Black continues with 'a' or 'b'.]LB[nf:b][le:a]
(;B[le];W[ng])

(;B[nf];W[ng];B[oe];W[of];B[ne];W[og];B[mg];W[lf];B[mh];W[le];B[nc];
W[pj];B[kh])
)

(;W[nf];B[ld])
)
)

(;B[pi]C[White continues with 'a', possibly 'b'.]LB[qk:b][md:a]
(;W[md])

(;W[qk]C[White 8 works with support in the lower right corner.];B[nd];
W[pg];B[pk];W[qj];B[pj];W[qi];B[pl])
)

(;B[tt]C[Black plays elsewhere.];W[nc];B[oc];W[ne];B[nd])
)

(;W[nc]C[White 6 is a mistake.];B[qe]
C[White continues with 'a' or 'b'.]LB[pg:b][qf:a]
(;W[qf];B[pf]
C[Black 9 works however White decides to continue owing to White
6 lacking sufficient connection to White 2,4.]
;W[qg]C[A likely continuation by White.];B[oc];W[nd];B[od]
C[White may try 'a' or 'b'.]LB[oe:b][of:a]
(;W[of];B[oe]
C['a' and 'b' are miai. Black has a large corner and is out in
the center, while White has splintered groups.]
LB[ne:b][pg:a])

(;W[oe];B[ne]
C[Black must cut at 15. White may try 'a' or 'b'. Either way, Black
takes the two White stones at top or White suffers for trying
to save them.]
LB[of:b][nf:a]
(;W[nf];B[me];W[of];B[mc])

(;W[of];B[me]
C[White may try 'a' or 'b' to save the two top stones. Both leave
White at a loss.]
LB[ld:b][lc:a]
(;W[lc];B[ld]
C[Black's aim is 'a'. White continues with 'a' or 'b'. White 'c'
does not work.]
LB[kc:c][mb:b][mc:a]
(;W[mc];B[kc];W[kd];B[ke];W[kb];B[jd];W[jc];B[kd];W[ic])

(;W[mb]C[Black continues with 'a' to 'c'.]LB[kc:c][kd:b][mc:a]
(;B[mc];W[nb];B[kc];W[md];B[ke];W[kb];B[jc])

(;B[kd];W[kc];B[jc];W[jb];B[ic];W[ib];B[hc])

(;B[kc];W[kd];B[mc];W[md];B[le];W[kb];B[jc];W[jb];B[nb];W[mc];B[ma];
W[lb];B[ic])
)

(;W[kc]C[White 20 is a mistake, leading to a snapback capture.];B[mc];
W[mb];B[nb];W[md];B[mc])
)

(;W[ld];B[md];W[mc];B[lc]C[White cannot save the three stones.])
)
)
)

(;W[pg]C[ikken tobi (1-space jump)];B[qf])
)

(;W[pj]
C[White 6 puts emphasis on the lower right.

Black continues with 'a' or 'b'.]
LB[qf:b][qe:a]
(;B[qe];W[pf];B[qf];W[pg])

(;B[qf];W[pf];B[qg];W[pg];B[ph];W[qe];B[re];W[qh];B[oh];W[pc];B[pb];
W[rd];B[rf];W[rc];B[qb];W[qi];B[rh];W[me])
)

(;W[tt]C[White plays elsewhere.];B[nd];W[ph];B[pj];W[ne];B[me];W[mf];
B[nf];W[ng];B[oe];W[of];B[ne];W[nj];B[om];W[mg];B[ke])
)

(;B[pc]
C[Kitani Minoru invariably played this way. Black 5 is thicker
than the knight's move, but White also gets good shape. 'a *'
is joseki, 'b' and 'c' are not. White 'd' is an overplay.]
LB[md:d][oc:c][qe:b][nd:a]
(;W[nd];B[oc]
C[White continues with 'a *', 'c' or 'd'. White 'b' is unreasonable
without the preparation move at 'c'. White 'e' avoids probes,
but is not efficient shape.]
LB[ne:e][me:d][le:c][nc:b][mf:a]
(;W[mf]C[Black continues with 'a *' or 'b *'.]LB[qf:b][mc:a]
(;B[mc]
C[White continues with 'a *'. Variation 'b' shows White playing
elsewhere.]
LB[dp:b][qe:a]
(;W[qe]C[
* GOOD VARIATION *])

(;W[tt]C[White plays elsewhere.];B[md]
C[White plays 'a' to emphasize influence and get sente. With White
'b', White sacrifices for influence.]
LB[jd:b][me:a]
(;W[me];B[kd])

(;W[jd]C[White is prepared to sacrifice for influence.];B[nf];W[ng];
B[of];W[me];B[ne];W[og];B[pf];W[pg];B[qf];W[qg];B[rf];W[ke])
)
)

(;B[qf]
C[White continues with 'a *'. 'b' shows White playing elsewhere.]
LB[dp:b][nc:a]
(;W[nc]C[
* GOOD VARIATION *])

(;W[tt]C[White plays elsewhere.];B[pf]
C[White continues with 'a' or 'b'.]LB[of:b][nc:a]
(;W[nc])

(;W[of];B[og];W[nf];B[ph])
)
)
)

(;W[nc]C[White 8 is unreasonable.];B[od];W[oe];B[ne]
C[White is cut in two. Black has a secure corner and better prospects
in the fight ahead.])

(;W[le]C[Black continues with 'a' or 'b'.]LB[nc:b][qf:a]
(;B[qf];W[nc])

(;B[nc]C[White continues with 'a' to 'c'.]LB[md:c][nf:b][qe:a]
(;W[qe];B[md];W[me];B[od];W[oe];B[ne];W[nf])

(;W[nf];B[qf];W[lc];B[od];W[oe];B[md];W[ld];B[ne];W[me])

(;W[md];B[nf];W[ne];B[qf])
)
)

(;W[me];B[nf];W[ne];B[qf])

(;W[ne]
C[White 'e' avoids probing moves by Black, but is not otherwise
efficient shape.]
;B[qf])
)

(;W[qe];B[od];W[oe];B[nd];W[qi];B[jc])

(;W[oc]
C[White 6 is not recommended.

Black continues with 'a'. Black 'b' is submissive.

Black 'c' or 'd' are playable if Black wants the right side (and
abandon the top).]
LB[od:d][qf:c][ob:b][nc:a]
(;B[nc];W[ob];B[od]
C[White plays 'a' if the ladder to capture Black 9 is unfavorable,
and 'b' if the ladder is favorable.]
LB[nb:b][nd:a]
(;W[nd]C[White plays this way when the ladder is unfavorable.];B[oe]
C[White continues with 'a'. White 'b' is something of a trick play;
a ladder is involved.]
LB[pf:b][mc:a]
(;W[mc];B[ne];W[md];B[pf])

(;W[pf]
C[Black plays 'a' if the Black stones can be caught in a ladder,
or can play 'b' if not.]
LB[nb:b][ne:a]
(;B[ne];W[nb];B[mc];W[mb];B[lc];W[lb];B[kc];W[jb];B[kb];W[ka];B[jc];
W[ib];B[pb];W[qe];B[re];W[rf];B[sd])

(;B[nb]C[Black must have the ladder to play this way.];W[of];B[ne]
C[White 'a' and 'b' are the unpleasant alternatives.]LB[nf:b][md:a]
(;W[md];B[mf])

(;W[nf];B[me])
)
)
)

(;W[nb]C[White plays this way when the ladder is favorable.];B[mc]
C[White continues with 'a'. White 'b' is a mistake.]LB[mb:b][nd:a]
(;W[nd];B[oe];W[md]
C[Black continues with 'a'. Black 'b' gives White superior thickness.]
LB[mb:b][pf:a]
(;B[pf];W[lc])

(;B[mb]C[Black 15 is not recommended.];W[lc];B[lb];W[kb];B[kc];W[ld];
B[jb];W[of];B[ne];W[ka];B[ja];W[kd];B[pb];W[nf];B[me];W[lf];B[pf];
W[qe];B[oa];W[mf];B[na];W[le];B[oc];W[pg];B[jc];W[qf])
)

(;W[mb]C[White 12 is a mistake.];B[lc]
C[White continues with 'a'. White 'b' compounds the mistake.]
LB[qe:b][lb:a]
(;W[lb];B[qe]C[White continues with 'a' or 'b'.]LB[pf:b][kc:a]
(;W[kc];B[me])

(;W[pf];B[nd];W[kc];B[qf];W[nf];B[kd];W[jd];B[ke];W[je];B[kf];W[oh];
B[jf];W[qg];B[rg];W[qh])
)

(;W[qe]C[White 14 is a mistake.];B[lb]C[White's four stones are lost.])
)
)
)

(;B[ob]C[Black 7, crawling along the second line, is weak.];W[nc];
B[nb];W[mc];B[qf];W[og];B[qg])

(;B[qf];W[ob]C[Black plays simply with 'a', or pushes with 'b'.]
LB[pf:b][qg:a]
(;B[qg];W[ne])

(;B[pf];W[of];B[og];W[nf];B[ng];W[mf];B[qe];W[mg])
)

(;B[od];W[nc]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[nd:b][qf:a]
(;B[qf];W[pf];B[pg]
C[White continues with 'a'. White 'b' is a mistake.]LB[qe:b][ne:a]
(;W[ne];B[qe])

(;W[qe]C[White 12 is a fatal mistake.];B[re];W[rf];B[qg];W[rd];B[se];
W[sd];B[of];W[sf];B[re];W[se];B[oe];W[re];B[rc];W[rh];B[rg];W[sg];
B[sc];W[sh];B[qi];W[ri];B[rj])
)

(;B[nd]C[Black 9 is not recommended.];W[mc];B[md];W[lc];B[pf];W[oe];
B[qe];W[of];B[ld];W[kd];B[lf];W[ke];B[mg];W[pg];B[qf];W[oh])
)
)

(;W[md]
C[White 6 is an overplay. Depending on the side of value, Black
continues with 'a' or 'b' locally, or plays elsewhere.]
LB[mb:b][qf:a])
)

(;B[qf]
C[White continues with 'a', possibly 'b'. White 'c' is premature.

White 'd' shows continuation if White plays elsewhere.]
LB[dp:d][og:c][qe:b][pc:a]
(;W[pc]
C[Black possibilities are 'a' to 'd'. Black 'a' is solid, and recommended.
Black 'b' provokes White 'a', a rather unnecessary provocation.
Black 'c' has no advantage over 'a'. Black 'd' is recommended
only if the right side has no promise for Black, and 'd' could
be sente (because the top has value).]
LB[qb:d][qg:c][pf:b][qe:a]
(;B[qe];W[kc]
C[Black may play elsewhere, or locally at 'a', or around 'b' or
'c'.]
LB[qj:c][pj:b][og:a]
(;B[og]
C[Black 9 is one local possibility, depending on support in the
lower right.])

(;B[pj]
C[Black 9 is high, a nice extension from Black 5, but a bit thin.])

(;B[qj]C[Black 9 is low, but may make sense strategically.])
)

(;B[pf]
C[Black 7 provokes White to cut.

White continues with 'a', or shows restraint with 'b', depending
on support towards the top-left.]
LB[of:b][qe:a]
(;W[qe];B[re]C[White continues with 'a' or 'b'.]LB[rf:b][rd:a]
(;W[rd];B[rc];W[rf];B[sd]
C[White continues with 'a'. White 'b' is unreasonable.]LB[rg:b][of:a]
(;W[of];B[rg])

(;W[rg]C[White 14 is unreasonable.];B[of];W[md];B[qh];W[rh];B[qi];
W[ri];B[qj])
)

(;W[rf];B[rd];W[rg];B[pb];W[ob];B[qb]
C[White 'a' is solid. White 'b' and 'c' are also possible. White
'd', threatening to capture the two Black stones, is an overplay.]
LB[of:d][nd:c][nc:b][oc:a]
(;W[oc]C[Black runs with 'a' or 'b'.]LB[og:b][of:a])

(;W[nc]C[Black runs with 'a' or 'b'.]LB[og:b][of:a])

(;W[nd]C[Black runs with 'a' or 'b'.]LB[og:b][of:a])

(;W[of]C[White 16 is unreasonable.];B[nb]
C[White continues with 'a'. White 'b' only compounds the mistake.]
LB[oa:b][oc:a]
(;W[oc];B[oa])

(;W[oa]C[White 18 is a mistake.];B[oc]
C[Neither White 'a' nor 'b' work.]LB[od:b][nc:a]
(;W[nc];B[od];W[oe];B[nd])

(;W[od];B[nc])
)
)
)
)

(;W[of]
C[White 8 may be a reasonable strategy if White has support at
top, but otherwise the outcome favors Black.]
;B[og];W[ng];B[oh];W[nf];B[qe])
)

(;B[qg])

(;B[qb];W[pf];B[qg])
)

(;W[qe];B[re]
C[White continues with 'a'. White 'b' and 'c' are mistakes.]
LB[rd:c][rf:b][pc:a]
(;W[pc]
C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
LB[qg:c][rg:b][qb:a]
(;B[qb];W[og]
C[White later aims at 'a'. Black may play 'a' or 'b' to forestall
this, or play elsewhere.]
LB[qh:b][qg:a];B[qg];W[ld])

(;B[rg];W[pf];B[pg];W[og];B[ph];W[jd])

(;B[qg]C[Black 9 leaves undesirable aji.];W[rf];B[rd];W[kc])
)

(;W[rf]C[White 8 is a mistake.];B[rg];W[rd];B[sf];W[rc];B[rb];W[qb];
B[pc]
C[White continues with 'a'. White 'b' is a mistake, as it puts
unnecessary pressure on the three White outside stones.]
LB[pb:b][sb:a]
(;W[sb];B[pb];W[ra];B[sd])

(;W[pb]
C[White 16 is a mistake, as crawling along the second line usually
is.]
;B[oc];W[sb];B[sd];W[ra];B[nd])
)

(;W[rd]C[White 8 is a mistake.];B[rf]
C[White continues with 'a'. White 'b' is unreasonable.]LB[rc:b][pc:a]
(;W[pc];B[rc])

(;W[rc]C[White 10 is a mistake.];B[pb];W[pc];B[qb];W[ob];B[rb])
)
)

(;W[og]C[White 6 is too loose, as White is left open at the top.];
B[qg];W[pc];B[nd]C[Black 9 spoils White's attempt at thickness.])

(;W[tt]C[White plays elsewhere.];B[pf];W[md];B[pc])
)

(;B[qe]
C[White continues with 'a' or 'b'.

White 'c' is not recommended.]
LB[pg:c][pf:b][pc:a]
(;W[pc]C[Black continues with 'a' or 'b'.]LB[pf:b][pb:a]
(;B[pb];W[ob];B[qb];W[pf])

(;B[pf];W[qb];B[rb];W[pb];B[qg]C[Next, White extends to 'a' or 'b'.]
LB[kd:b][ld:a])
)

(;W[pf]
C['A' is joseki and emphasizes the right side.
'B' is inferior and emphasizes the top.]
LB[oc:B][pc:A]
(;B[pc]C[White continues with 'a' or 'b'.]LB[oc:b][nd:a]
(;W[nd];B[oc];W[mf])

(;W[oc]
(;B[qg];W[nd])

(;B[ob]C[Black 9 is not recommended.];W[nc];B[nb];W[lc];B[qg];W[oh];
B[qh]C[Black 15 avoids weakness at the marked intrusion point.]MA[qf])
)
)

(;B[oc];W[qf]
C[Only 'A' is possible now, 'B' as an example for all extensions
wider than A is wrong.]
LB[mc:B][nc:A]
(;B[nc]
C[To eliminate the possibility of White A, Black B, White C, Black
must play this very slow move and ends in gote. So Black 7 was
not joseki.]
LB[oc:7][qb:C][pb:B][pc:A];W[pj];B[jd])

(;B[mc];W[pj]
C[Black must play an extension on 'A', tenuki 'B' gives White a
group on the top.]
PL[2]
(;B[jd]
C[Still, Black 9 was wrong, so White cuts or gets a ladder break..]
LB[mc:9][dp:B][jd:A];W[pc];B[pb];W[qb];B[rb];W[ob];B[qa];W[nc];B[od];
W[nd];B[oe];W[ne];B[of];W[og]C[Ladder.])

(;B[dp];W[kc]C[Black should defend on'A', tenuki on 'B' is wrong.]
LB[cm:B][nc:A]
(;B[nc];W[hc])

(;B[cm];W[pc];B[pb];W[qb];B[rb];W[ob];B[qa];W[nc];B[od];W[nd];B[oe];
W[mb])
)
)
)
)

(;W[pg]C[White 6 is not recommended.];B[pf];W[of];B[qf];W[og]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[oe:b][nd:a]
(;B[nd];W[ne];B[pc];W[md];B[me])

(;B[oe];W[ne];B[od];W[nd];B[oc];W[nc];B[ob];W[qg])
)
)

(;B[oc]
C[Black 5 is not recommended.

White continues with 'a', possibly 'b'.]
LB[qe:b][pc:a]
(;W[pc];B[pb]C[White continues with 'a' or 'b'.]LB[qb:b][qe:a]
(;W[qe];B[nb];W[qi])

(;W[qb]
C[Black continues with 'a', or, if the ladder for White to capture
Black 5 is unfavorable, possibly 'b'.]
LB[rb:b][ob:a]
(;B[ob];W[rb];B[qe];W[qf];B[rf];W[qg];B[rg];W[rc];B[sd];W[qh];B[rh];
W[nd];B[mc]C[White continues with 'a'. White 'b' is an overplay.]
LB[ri:b][qi:a]
(;W[qi];B[ri];W[qj])

(;W[ri]
C[White 22 is an overplay that if played properly by Black, leads
White to doom.]
;B[qi];W[rj];B[pf];W[of];B[pg];W[ph];B[og];W[ng];B[oh];W[pi];B[od];
W[oe];B[nf];W[ne];B[mf];W[me];B[le];W[lf];B[mg];W[ld];B[ke];W[md];
B[kd];W[lc];B[pj];W[oi];B[nh];W[qj];B[kc];W[lb];B[mb];W[kb];B[jb])
)

(;B[rb];W[ob];B[qa];W[nc])
)
)

(;W[qe]
C[Forcing first at the marked location is generally recommended,
but White 6 as shown is also playable.]
MA[pc];B[pc];W[ne];B[md];W[pi])
)

(;B[nc]
C[Black 5 is not recommended.

White continues with 'a' to 'c'.]
LB[qe:c][ob:b][pc:a]
(;W[pc];B[pb]
C[White continues with 'a' or 'b', depending upon the side of interest.]
LB[qe:b][ob:a]
(;W[ob];B[qb];W[oc];B[qf];W[nd])

(;W[qe];B[ob];W[qi])
)

(;W[ob]
C[Black continues with 'a' or 'b'. Black 'c' is not recommended.]
LB[pc:c][qe:b][qb:a]
(;B[qb];W[oc];B[qf];W[nd])

(;B[qe];W[pf];B[qg];W[qb];B[qf];W[pc];B[pg])

(;B[pc]
C[Black 7 is the obvious blunt move, but is not recommended. Black
secures good outside influence, but at considerable sacrifice
in the corner.]
;W[oc];B[od];W[nb];B[mc];W[mb];B[oe];W[qe];B[lc];W[rd];B[rc];W[re];
B[of];W[pb];B[qg])
)

(;W[qe]
C[Pushing first at the marked location before playing White 6 is
recommended.]
MA[pc];B[pc];W[qi])
)

(;B[tt]C[Black plays elsewhere.

White continues with 'a' or 'b'.]
LB[qe:b][pc:a]
(;W[pc]C[Black continues with 'a' or 'b'.]LB[qe:b][rf:a]
(;B[rf])

(;B[qe];W[qf];B[rf];W[qb];B[qg];W[pf];B[rd])
)

(;W[qe];B[ob])
)
)

(;W[pf]
C[Black joseki continues with 'a' or 'b*'. Other continuations
show (at best) a special strategy.

'f' shows Black playing elsewhere.]
LB[dp:f][ob:e][nc:d][qe:c][pe:b][od:a]
(;B[od]C[White continues with 'a', possibly 'b'.]LB[nf:b][oe:a]
(;W[oe]C[Black continues with 'a', or 'b' to take sente.]
LB[oc:b][pc:a]
(;B[pc];W[nd];B[pe]
C[White continues with 'a'. White 'b' or 'c' are overplays that
start a fight where White is split disadvantageously.]
LB[oc:c][qe:b][nf:a]
(;W[nf]C[Black continues with 'a' or 'b'.]LB[nc:b][qf:a]
(;B[qf];W[pg];B[qg];W[ph];B[nc];W[md];B[mc];W[ld])

(;B[nc];W[md];B[mc];W[kd])
)

(;W[qe];B[ne]C[White continues with 'a' or 'b'.]LB[of:b][pd:a]
(;W[pd];B[oc];W[md]C[Black continues with 'a' or 'b'.]LB[re:b][nf:a]
(;B[nf];W[of];B[le];W[kc]C[Black continues with 'a' or 'b'.]
LB[nb:b][nh:a]
(;B[nh])

(;B[nb];W[ld];B[nh];W[ph];B[ke])
)

(;B[re];W[of];B[me];W[ld];B[le]
C[White continues with 'a'. White 'b' is a mistake.]
LB[se:c][ke:b][kd:a]
(;W[kd];B[qg])

(;W[ke]C[White 20 is too aggressive.];B[mg]
C[Black 21 weakens the White stones to the right.])
)
)

(;W[of];B[md];W[nc];B[me];W[lb])
)

(;W[oc];B[of];W[pd];B[qe];W[pg];B[nf];W[ne];B[oh];W[qi];B[lf])
)

(;B[oc]C[Black 7 is intended to take sente.];W[me])
)

(;W[nf]C[Black continues with 'a' or 'b'.]LB[pe:b][oe:a]
(;B[oe];W[of];B[md])

(;B[pe];W[qf];B[me];W[pk])
)
)

(;B[pe];W[oe];B[qe]
C[White continues with 'a *', or possibly the looser 'b'.]
LB[ng:b][of:a]
(;W[of]
C[Black continues with 'a *' or 'b *', depending upon the side
of interest. 

Black 'c' is a mistake.]
LB[oc:c][qg:b][nc:a]
(;B[nc];W[qf]C[
* GOOD VARIATION *])

(;B[qg]C[Black 9 emphasizes the right side.];W[nc]
C[
* GOOD VARIATION *])

(;B[oc]C[Black 9 is a mistake, as White can seal Black in.];W[nc])
)

(;W[ng]
C[Black continues with 'a' or 'b'.

Black 'a' leaves a fluid situation until later.
Black 'b' creates solid shapes, and is the more likely variation
of determined amateurs.]
LB[of:b][qg:a]
(;B[qg];W[nc])

(;B[of];W[nf];B[og];W[oh];B[pg];W[ph];B[qg];W[nh]
C[Black continues with 'a' or 'b'.]LB[ne:b][qh:a]
(;B[qh])

(;B[ne];W[me];B[od];W[md])
)
)
)

(;B[qe]
(;W[pe]C[Black continues locally with 'a' or 'b', or plays elsewhere.]
LB[oc:b][qg:a])

(;W[qf];B[pe];W[of];B[nd])
)

(;B[nc]C[White resists with 'a', or goes with the flow with 'b'.]
LB[qe:b][pc:a]
(;W[pc];B[pe];W[oe];B[qe];W[od];B[of];W[nf];B[og];W[me];B[kc]
C[Black tries to have his cake and eat it too.])

(;W[qe];B[pc];W[od])
)

(;B[ob]
C[Given just the local situation, there is no reason for Black
to play so low.])

(;B[tt]C[Black plays elsewhere.

White continues with 'a' or 'b'.]
LB[pc:b][qe:a]
(;W[qe];B[pc];W[od];B[oc];W[nd];B[mc])

(;W[pc];B[pe]LB[oe:b][qe:a]
(;W[qe];B[oe]C[White continues with 'a'. White 'b' is awkward.]
LB[re:b][qb:a]
(;W[qb];B[rb];W[pb];B[re];W[qf];B[rf];W[qh];B[rg];W[ng];B[me];W[mc];
B[ke])

(;W[re]C[White 9 leads to awkward shape for the White stones at top.];
B[pb];W[oc];B[ob];W[nc];B[rb])
)

(;W[oe]C[White 7 is not recommended.];B[qe];W[of]
C[Black continues with 'a' or 'b'.

Black 'a' is a consistent territory orientation. Black 'b' aims
to create a center position.]
LB[od:b][qf:a]
(;B[qf];W[ph];B[od];W[nd]
C[White sacrifices for thickeness, keeping to original strategy.];
B[oc];W[pb];B[nb];W[mb];B[ob];W[na];B[qb];W[lc]
C[Black has a tidy profit, while White's thickness is less than
perfect.])

(;B[od];W[oc];B[nd];W[nc];B[md];W[mc];B[ld];W[qf];B[pb];W[ob];B[qb];
W[kb])
)
)
)
)

(;W[pc]AW[jc]
C[White 4 is a mistake, even with support at top as shown.];B[pe]
C[Black responds to White's mistake at 4.];W[oe];B[of]
C[White continues with 'a'. White 'b' is a mistake.]LB[qe:b][pf:a]
(;W[pf];B[qe];W[ne];B[nf];W[me];B[pg]
C[The black hane at 'a' plus connection remains sente.]LB[pb:a])

(;W[qe];B[pf];W[re];B[pb];W[ob];B[qb];W[od];B[rd];W[rg];B[qf];W[rf];
B[qh];W[rh];B[qi];W[ri];B[qj];W[rj];B[rk];W[qg];B[pg];W[qk];B[rl];
W[ph];B[oh];W[pi];B[pj];W[oi];B[oj];W[ni];B[nf];W[se];B[sj];W[sb];
B[sd];W[pa];B[ra];W[rb];B[si]C[Neither 'a' nor 'b' work.]
LB[sa:b][sh:a]
(;W[sh];B[sk])

(;W[sa];B[sh])
)
)
)

(;B[oc];W[pc];B[pb]C[White continues with 'a' to 'c'.]
LB[ob:c][qb:b][qd:a]
(;W[qd];B[rb];W[rc];B[qb];W[pf])

(;W[qb];B[rb];W[ob];B[qa];W[nc]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[qe:b][pe:a]
(;B[pe]
C[Black 11 is a tesuji.

White continues with 'a'. White resistance with 'b' is futile.]
LB[qd:b][od:a]
(;W[od];B[qd])

(;W[qd]C[White tries to resist Black's tesuji, a mistake.];B[od]
C[White is at a loss as to a good next move.])
)

(;B[qe]C[Black 11 is not recommended.];W[od])
)

(;W[ob];B[nb];W[qb];B[oa];W[rc];B[od];W[qd];B[of])
)

(;B[ob];W[qd];B[rc]C[White continues with 'a' or 'b'.]
LB[md:c][nd:b][qh:a]
(;W[qh];B[nd])

(;W[nd]C[Black continues with 'a' or 'b'.]LB[oc:b][mc:a]
(;B[mc];W[le])

(;B[oc];W[od];B[rd];W[qf])
)

(;W[md]C[White 6 is an overplay.];B[nd];W[ne];B[nc];W[me];B[oe];W[of];
B[pe];W[pf];B[qe];W[qf];B[re]
C[White has given up too much for thickness.])
)
)

(;W[oc]
C[
Ikken Kakari = Hankan Keolch'im = Yi Gua` Jiao~ = 1-Space Approach
-------------------------------------------------------------------

Black continues with 'a *' to 'f'. Black 'g' shows Black playing
elsewhere.

e5,d4,c3,b2,a1
]
LB[dp:g][ld:f][qe:e][od:d][pf:c][qf:b][pe:a]
(;B[pe]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

White continues with 'a' or 'b*'.
]
LB[lc:b][md:a]
(;W[md];B[qi];W[ic])

(;W[lc];B[qi]C[
* GOOD VARIATION *];W[oe]
C[Black continues with 'a' or 'b'.]LB[pf:b][of:a]
(;B[of];W[pd];B[qd];W[pf];B[qe];W[ne];B[pg];W[nf];B[og])

(;B[pf];W[qb];B[rb];W[pb];B[pd];W[od])
)
)

(;B[qf]
C[
Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
-------------------------------------------------------------

Black 3 is mild.

White continues with 'a' to 'c'. White 'd' show White playing
elsewhere.

d4, c3, b2, a1
]
LB[of:c][oe:b][lc:a]
(;W[lc];B[tt]C[Black plays elsewhere.];W[qb]
C[White 6 looks like an endgame move, but is more threatening than
that.]
;B[rb]C[White continues with the fiesty 'a', or 'b'.]LB[pb:b][qd:a]
(;W[qd]C[Black 8 is a clamping tesuji, and an invitation to a fight.];
B[pc];W[pd];B[od])

(;W[pb];B[tt]C[Black plays elsewhere.];W[qh];B[of];W[rd];B[rc];W[rf];
B[qe];W[re];B[qd];W[oh])
)

(;W[oe]
C[Black continues with 'a' to 'c'. Black 'd' shows Black playing
elsewhere.

e5, d4, c3, b2, a1]
LB[dp:e][of:d][kd:c][pd:b][pg:a]
(;B[pg];W[qb];B[rb];W[qd];B[rd];W[pc];B[rc];W[kd])

(;B[pd];W[od];B[pg];W[kc])

(;B[kd]
C[White continues with 'a'. White 'b' is not recommended, as it
can start a slippery slope to disaster.]
LB[pg:b][qb:a]
(;W[qb];B[rb];W[qd];B[rd];W[pc];B[rc];W[qe];B[re];W[pf];B[qg])

(;W[pg]C[White 6 is an overplay.];B[pf];W[of];B[og];W[pi];B[ng];W[qg];
B[pd];W[od];B[me];W[rd];B[qd];W[rc];B[rb];W[sb];B[ra];W[rf];B[re];
W[se];B[qe];W[qb];B[pb];W[rg];B[ob];W[md];B[nc];W[nd];B[ld];W[mc];
B[nb])
)

(;B[of];W[nf];B[og];W[qe];B[re];W[pe];B[rg];W[kd])

(;B[tt]C[Black plays elsewhere.];W[pg];B[qg];W[ph];B[qh];W[pi])
)

(;W[of];B[ph];W[jd])

(;W[tt]C[White plays elsewhere.];B[ld];W[oe];B[pd];W[od];B[pg];W[mg]
C[White 12 is a tesuji. Black immediately playing at 'b' weakens
Black 7, so is not advised.

Black 'a' is one possible continuation.]
LB[nf:b][id:a]
(;B[id]C[Black 11 is one possible extension.])

(;B[nf]C[Black 11 is not recommended.];W[qe];B[pe];W[of];B[og];W[pf]
C[Black may try 'a' or 'b'.]LB[re:b][qg:a]
(;B[qg];W[qb];B[rb];W[pb];B[rd];W[me];B[ng];W[id])

(;B[re];W[qg];B[rf];W[ng];B[qh];W[me])
)
)
)

(;B[pf]
C[
Oogeima = Nunmokcha = Da` Fei = Large Knight's Move
----------------------------------------------------

White continues with 'a'. White 'b' is not recommended.
]
LB[qd:c][lc:b][kd:a]
(;W[kd]C[White plays large like Black. This is appropriate.])

(;W[lc]
C[White 4 is too short an extension.

White continues locally with 'a', or plays elsewhere ('b').]
LB[dp:b][pc:a]
(;B[pc];W[od];B[ph])

(;B[tt]C[Black plays elsewhere.];W[qh]
C[Black continues with 'a'. 'b' shows Black playing elsewhere.]
LB[dp:b][qf:a]
(;B[qf])

(;B[tt]C[Black plays elsewhere.];W[qe]
C[Black continues with 'a' or 'b'.]LB[pd:b][pe:a]
(;B[pe]C[White continues with 'a' or 'b'.]LB[pd:b][qd:a]
(;W[qd];B[pd];W[pc];B[qf];W[rc])

(;W[pd];B[qd];W[re];B[ob];W[nb];B[pb];W[nd];B[rb])
)

(;B[pd]
C[White continues with 'a' for territory on both sides, or 'b'
to push into the center at the sacrifice of the group at top.]
LB[pe:b][qf:a]
(;W[qf];B[pg];W[ph];B[od];W[nc];B[oh];W[oi];B[nh];W[qg];B[nf])

(;W[pe];B[od];W[oe];B[nc];W[ne];B[tt]C[Black plays elsewhere.];W[nb];
B[nd];W[ob];B[ld];W[kc];B[me];W[mf];B[lf];W[mg])
)
)
)
)

(;W[qd]C[White 4 is not recommended, as it gives Black good shape.];
B[pd];W[pc];B[qe];W[qb];B[rd];W[rb];B[md];W[mb])
)

(;B[od]C[
Ue-zuke (attach on top)
--------------------------
];W[nd]
C[Black continues with 'a' or 'b'.]LB[oe:b][pd:a]
(;B[pd]C[White continues with 'a' to 'c'. White 'd' shows tenuki.]
LB[dp:d][nc:c][mc:b][ne:a]
(;W[ne];B[nc];W[mc];B[nb]
C[White continues with 'a' to emphasize the top, 'b' to target
the right side.]
LB[ld:b][mb:a]
(;W[mb];B[ob];W[le])

(;W[ld];B[ob]C[Black 11 is honte (the proper move).];W[pf])
)

(;W[mc]
C[Black continues with 'a' or 'b'. 'c' shows Black playing elsewhere.]
LB[dp:c][pg:b][ne:a]
(;B[ne];W[me]C[Black continues with 'a'. Black 'b' is an overplay.]
LB[mf:b][nf:a]
(;B[nf])

(;B[mf]C[Black 9 is an overplay.];W[nf];B[oe]
C[White continues with 'a'. White 'b' is a mistake.]LB[ng:b][le:a]
(;W[le];B[ng];W[lf];B[mg]C[White 10 has aji, and White is more solid.])

(;W[ng]C[White 12 is an overplay.];B[le];W[md];B[lf];W[kd];B[pg];W[ni]
C[Black's three stones in the center can escape with relative ease.

Black can press the White center stones for profit.])
)
)

(;B[pg];W[jd])

(;B[tt]
C[White continues with 'a'. White 'b' is an unreasonable overplay.]
LB[pf:b][nf:a]
(;W[nf];B[qf])

(;W[pf]C[White 8 is unreasonable.];B[of];W[oe];B[pe];W[ne];B[pg];W[qf]
;B[qg];W[qe];B[rf];W[re];B[rg];W[rc];B[rd])
)
)

(;W[nc]
C[White 6 is a bit slow, but playable.

Black continues with 'a' to 'c'.]
LB[of:c][jd:b][ne:a]
(;B[ne];W[me]C[Black continues with 'a' or 'b'.]LB[mf:b][nf:a]
(;B[nf];W[mf];B[ng])

(;B[mf];W[le];B[nf];W[id])
)

(;B[jd]C[White continues with 'a', or plays elsewhere ('b').]
LB[dp:b][nf:a]
(;W[nf];B[pg])

(;W[tt]C[White plays elsewhere.];B[ne];W[me];B[mf];W[nf];B[oe];W[le];
B[mg])
)

(;B[of];W[ne];B[jd])
)

(;W[tt]C[Black continues with 'a', or, with support at right, 'b'.]
LB[ne:b][nc:a]
(;B[nc];W[mc];B[nb];W[md];B[ob])

(;B[ne]AB[pj]C[Black plays 7 as shown with support at right.]MA[pj];
W[md];B[me];W[ld];B[kf])
)
)

(;B[oe]
C[White continues with 'a'. White 'b' and 'c' are not recommended.
White 'd' gives away too much territory.]
LB[ne:d][nc:c][mc:b][pc:a]
(;W[pc];B[qd])

(;W[mc]C[White 6 is slow.];B[pc];W[ob]
C[Black continues with 'a' to 'c'.]LB[ld:c][ne:b][pi:a]
(;B[pi])

(;B[ne];W[me];B[mf];W[le];B[lf];W[ke];B[pj])

(;B[ld]C[White continues with 'a' or 'b'.]LB[lc:b][ne:a]
(;W[ne];B[of];W[nf];B[og];W[lf];B[id];W[kb])

(;W[lc];B[jd];W[le];B[ph])
)
)

(;W[nc]
C[White 6 is slow.

Black continues with 'a'. Variation 'b' shows Black playing elsewhere.]
LB[dp:b][kd:a]
(;B[kd]
C[White continues with 'a'. White 'b' is unreasonable. White 'c'
is not good either.]
LB[qe:c][pd:b][ne:a]
(;W[ne];B[of];W[mg];B[oh])

(;W[pd]C[White 8 is unreasonable.];B[pc];W[pe];B[pf];W[of];B[ne];W[qf]
;B[pg];W[rd];B[rc];W[re];B[ob];W[nb];B[pb];W[me];B[nf])

(;W[qe]C[White 8 is not recommended.];B[qd];W[re];B[pc];W[ne];B[of];
W[qh];B[oh];W[lf];B[qi];W[ri];B[qg];W[rg];B[ph];W[rh];B[qj])
)

(;B[tt]C[Black plays elsewhere.];W[qe]
C[Black continues with 'a'. Black 'b' is not recommended. Black
'c' is a mistake, as is Black 'd'.]
LB[pg:d][qf:c][pd:b][qd:a]
(;B[qd];W[re];B[pc];W[qh];B[ne];W[me];B[mf];W[le])

(;B[pd]C[Black 9 is not recommended.];W[qh])

(;B[qf]C[Black 9 is a mistake.

White continues with 'a' or 'b'.]
LB[rf:b][pf:a]
(;W[pf];B[pe];W[qd];B[pd]C[Black's shape simply could not be worse.];
W[rf];B[qg];W[pc];B[rc];W[re];B[rg];W[nf]
C[White 20 starts building great thickness the sacrifice of the
four White stones]
;B[of];W[og];B[pg];W[ne];B[pf];W[oh])

(;W[rf];B[qg];W[pc];B[qd];W[pd];B[re];W[pe];B[rd];W[og])
)

(;B[pg];W[pc];B[qd];W[pd];B[pe];W[re];B[rb];W[rd];B[rc];W[qh];B[pb];
W[ob];B[pa];W[ne])
)
)

(;W[ne]
C[White 6 gives away too much territory.

Black 'a' takes advantage of White's mistake, whereas 'b' lets
White move seem playable.]
LB[nf:b][nc:a]
(;B[nc]C[White continues with 'a' or 'b', neither favorable.]
LB[pc:b][mc:a]
(;W[mc];B[nb];W[mb];B[ob];W[nf];B[pg])

(;W[pc];B[pd];W[qb];B[qd];W[nb];B[mc];W[mb];B[lc];W[rb];B[nf];W[me];
B[jd];W[mf];B[ng])
)

(;B[nf]
C[Black 7 is not recommended.

White continues with 'a' or 'b'.]
LB[nc:b][pc:a]
(;W[pc];B[qd])

(;W[nc];B[of];W[jc];B[pc])
)
)
)
)

(;B[qe]
C[
Ikken Biraki = Hankan Peollim = Chai Yi = 1-Space Extension
------------------------------------------------------------
]
;W[lc]C[A is a continuation for Black]LB[qi:A])

(;B[ld]
C[
Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia = 2-Space High Pincer
-----------------------------------------------------------------------------

'A' or 'B'.
]
LB[oe:B][qd:A]
(;W[qd]C['A' or 'B'.]LB[pc:B][rd:A]
(;B[rd];W[pd];B[re];W[qb];B[rc];W[pg])

(;B[pc];W[pd];B[od];W[oe];B[nd];W[rc];B[rb];W[rd];B[nc];W[qh]
C[Aji for White on A and B.]LB[lb:B][ob:A])
)

(;W[oe];B[qe];W[og];B[qg];W[id])
)

(;B[tt]
C[Black plays elsewhere. This is not recommended. Black will be
forced low to live.]
;W[pe];B[pd];W[od];B[qe];W[qf];B[rf]
C[White continues with 'a'. White 'b' is a mistake.]LB[re:b][pf:a]
(;W[pf];B[rd];W[pc];B[qd];W[jd])

(;W[re]C[White 10 is an overplay.];B[qd];W[pf];B[rg])
)
)

(;W[nd]
C[
Nikken Takagakari = Dukan Nop'dakeolch'im = E`r Gaogua`jiao~ = 2-Space High Approach
-------------------------------------------------------------------------------------

Black continues with 'a *' or 'b *'. Black 'a' works well when
Black is in the lower right (so an extension in the middle works
both ways). The more conservative 'b' is makes a slightly tighter
shape (better for a fight).

Black 'c' is possible if Black has an extension on the right
side. 

Black 'd' may be best if White has a stone on the right side
that blocks extension.

Black 'e' and 'f' threaten an invasion on the top.

Black 'g' plays elsewhere.
]
LB[dp:g][pd:f][qe:e][qf:d][jd:c][pe:b][pf:a]
(;B[pf]
C[
Oogeima = Nunmokcha = Da` Fei = Large Knight's Move
----------------------------------------------------
]
;W[jc]
C[The Black extension 'A *' is joseki. Tenuki 'B' is possible,
although not recommended.]
LB[dp:B][qj:A]
(;B[qj]
C[
* GOOD VARIATION *

'A' and 'B' are good continuations. 'C' is disadvantageous. 'D'
is wrong.]
LB[qe:D][pc:C][nf:B][oc:A]
(;W[oc]C[Black continues on 'A'. Tenuki 'B' is disadvantageous.]
LB[dp:B][pc:A]
(;B[pc];W[nf])

(;B[dp];W[qb]C['A' is right. 'B' is a mistake.]LB[rb:B][qd:A]
(;B[qd];W[rb])

(;B[rb];W[qd];B[pd];W[pc];B[rc];W[pe];B[qe];W[od];B[rd])
)
)

(;W[nf]LB[pc:B][oc:A])

(;W[pc]C[White settles the corner in sente, but solidifies Black.];
B[pd];W[oc];B[qb];W[nf];B[ph]C[Black is better off.])

(;W[qe];B[pe];W[qd];B[pd];W[rc];B[qf];W[pc];B[qb];W[rb];B[re];W[rd];
B[oc];W[pb];B[ob];W[qa];B[od]
C[White has eleven points, but Black has huge influence, and the
White stones on top are hurt.])
)

(;B[dp];W[qh];B[qf];W[pc];B[pd];W[oc];B[qb];W[oh])
)

(;B[pe]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

White continues with 'a *'. White 'b' is possible with support
at right.
]
LB[qg:b][jc:a]
(;W[jc]
C['A *' is joseki, tenuki 'B' and the invasion 'C' are possible.]
LB[lc:C][dp:B][qi:A]
(;B[qi]C[
* GOOD VARIATION *];W[pc]
C[Black continues with 'a'. Black 'b' gives White the corner in
sente, a local loss.]
LB[oc:b][pd:a]
(;B[pd];W[oc];B[qb];W[nf];B[pg])

(;B[oc]
C[Black 7 is not recommended.

White continues with 'a'. White 'b' is a mistake.]
LB[od:b][pd:a]
(;W[pd];B[od];W[qd];B[qe];W[rd];B[oe]
C['A' secures the White corner. 'B' does the same, but strenghens
Black.]
LB[ob:B][re:A]
(;W[re])

(;W[ob];B[nb];W[pb];B[nc])
)

(;W[od]C[White 8 is a mistake.];B[pd];W[pb];B[ob];W[qb];B[rb];W[rc];
B[qd];W[ra];B[sb];W[sc];B[pa];W[sa];B[rb];W[sb];B[oa];W[qa];B[rd];
W[nc];B[sd];W[nb];B[rb])
)
)

(;B[dp];W[qg];B[of];W[pi];B[rf])

(;B[lc];W[ld];B[mc];W[md];B[nc];W[od];B[pc];W[kc])
)

(;W[qg]AW[qj]C[In this case, Black 3 was a mistake.];B[of]
C[Black must play 5 to get to the center.];W[kd]
C['a' and 'b' are local vital points.]LB[oc:b][re:a])
)

(;B[jd]AB[qj]
C[A pincer around Black 3 is possible if Black has support such
as the stone shown on the right side.]
;W[pd];B[qd];W[pf]C[White aims to settle himself playing loosely.];
B[qe];W[ng];B[qg];W[hd]AW[dd]
C[White 10 is a checking extension. This play makes sense if White
has support in the top right corner, as shown.])

(;B[qf]AW[qj]
C[
Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
-------------------------------------------------------------

Black plays 3 if White has a stone as shown that blocks Black
from extending down the right side.
])

(;B[qe]
C[
Ikken Biraki = Hankan Peollim = Chai Yi = 1-Space Extension
------------------------------------------------------------
]
;W[jc]
C[Black wants to take away White's base on 'A' or not and plays
tenuki 'B'.]
LB[dp:B][lc:A]
(;B[lc]C['A' or 'B'.]LB[pc:B][ld:A]
(;W[ld];B[mc];W[md]C['A' is right, 'B' leads to overconcentration.]
LB[nc:B][ob:A]
(;B[ob];W[kc])

(;B[nc];W[kc];B[od];W[oe];B[pd]
C[Now, the triangled stone is too near.]TR[qe])
)

(;W[pc];B[pd];W[oc]
C[Black gives White a safe group and takes much influence on 'A'
or hunts on 'B'.]
LB[le:B][qb:A]
(;B[qb];W[kd];B[me];W[ld];B[md];W[mc];B[ne];W[lb])

(;B[le];W[qb];B[rc])
)
)

(;B[dp];W[pc];B[pd];W[oc];B[qb])
)

(;B[pd]
C[
Kosumi = Ibkucha = Jian = Diagonal
-----------------------------------
]
;W[jc]C[Black 'A' or 'B'.]LB[qh:B][lc:A]
(;B[lc];W[ld];B[mc];W[md];B[nc];W[kc];B[od])

(;B[qh];W[oc])
)

(;B[dp]C[
Tenuki
-------

White on 'A' or 'B'.
]LB[pe:B][qe:A]
(;W[qe]C[Black continues on 'A', 'B' and 'C' are mistakes.]
LB[pe:C][oc:B][nb:A]
(;B[nb]
C[White makes a light extension on 'A' or gives Black the choice
on 'B'.]
LB[mb:B][pj:A]
(;W[pj])

(;W[mb]
C[Black outside and gives away the corner on 'A' or lives in the
corner without being fully enclosed on 'B'.]
LB[ob:B][mc:A]
(;B[mc];W[nc];B[lb];W[ob];B[ma];W[pc];B[le])

(;B[ob];W[mc];B[pe];W[qf];B[qd];W[ph])
)
)

(;B[oc];W[nc];B[pe]C['A' or 'B'.]LB[pd:B][qf:A]
(;W[qf];B[qd];W[pf];B[oe];W[ng];B[mf];W[kd])

(;W[pd];B[qd];W[pf];B[oe];W[od];B[qf];W[re];B[of];W[rf];B[pg];W[qh];
B[rd];W[qg]
C[Black isn't yet alive in the corner and heavy in the center.])
)

(;B[pe];W[pd];B[qd];W[re];B[pf];W[pc];B[pb];W[ob];B[qb];W[qg]
C[The Black corner is dead.])
)

(;W[pe]C[Black lives on 'A' or 'B'.]LB[re:B][nb:A]
(;B[nb])

(;B[re])
)
)
)

(;W[od]
C[
Ikken Takagakari = Hankan Nop'dakeolch'im = Yi Gaokeolch'im = 1-Space High Approach
------------------------------------------------------------------------------------

White 2 is a high tight attack with a direction bias.

White continues with 'a'. Tactically, any other response is less
advantageous.
]
LB[oc:e][pd:d][qf:c][qe:b][pe:a]
(;B[pe]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

White continues with 'a' to 'd'. White 'e' indicates a special
strategy of influence toward the top-left. Variation 'f' covers
White playing elsewhere.
]
LB[dp:f][nf:e][ph:d][jd:c][kd:b][oe:a]
(;W[oe];B[pf];W[pc];B[qb]
C[White continues with 'a', or plays on a large scale with 'b'.]
LB[of:b][kd:a]
(;W[kd])

(;W[of];B[pg];W[nh])
)

(;W[kd];B[oe];W[oc];B[ne];W[md];B[pj]C[The joseki concludes.];W[qb]
C[A later continuation.];B[rb];W[pb];B[rd])

(;W[jd]
C[Black continues with 'a' 'b'. Black 'c' is not recommended.

Black 'd' shows Black playing elsewhere.]
LB[pj:e][dp:d][ld:c][oe:b][pg:a]
(;B[pg]C[White continues with 'a'. White 'b' is a mistake.]
LB[pc:b][oc:a]
(;W[oc])

(;W[pc]C[White 6 is a mistake, as it lets Black solidify the corner.];
B[qb];W[oe];B[of];W[me])
)

(;B[oe];W[md])

(;B[ld]C[Black 5 is unreasonable.

White continues with 'a' or 'b'.]
LB[nf:b][oe:a]
(;W[oe]C[White 6 builds thickness for an attack on Black 5.];B[pf];
W[of];B[pg];W[ke];B[mf];W[me];B[le];W[lf];B[md];W[mg];B[ne];W[nf])

(;W[nf]C[White 6 is a light way of playing.];B[lf];W[pd];B[qd];W[pf];
B[oe];W[ne];B[qe];W[nh])
)

(;B[tt]C[Black plays elsewhere.

White continues with 'a' to 'd'.]
LB[qi:d][qh:c][pg:b][qg:a]
(;W[qg]C[Black continues with 'a' or 'b'.]LB[pj:b][oe:a]
(;B[oe]
C[White plays 'a' to preserve position at top, or 'b' to emphasize
the right side.]
LB[nd:b][md:a]
(;W[md];B[ph];W[qi];B[qh];W[rh];B[pg];W[qf];B[ri];W[rj];B[pi];W[qj];
B[rg];W[si];B[rf])

(;W[nd]
C[White 7 emphasizes the right side, as Black launches a splitting
attack.]
;B[og];W[pi];B[ld];W[ne];B[ke];W[mf];B[nh])
)

(;B[pj];W[og];B[oe];W[md]C[White continues with 'a' or 'b'.]
LB[oc:b][ne:a]
(;B[ne];W[mg];B[nd];W[nc];B[mc];W[lc];B[mb];W[nb];B[lb];W[kc];B[me];
W[ld];B[oc];W[ob];B[pb];W[pc];B[pd];W[kb];B[oc])

(;B[oc];W[mf])
)
)

(;W[pg];B[oe];W[md]C[Black continues with 'a' or 'b'.]LB[nf:b][og:a]
(;B[og];W[pi];B[qg];W[qh];B[pf];W[ph];B[rg])

(;B[nf];W[pj];B[oc])
)

(;W[qh];B[qf])

(;W[qi];B[qg]C[White continues with 'a' or 'b'.]LB[pc:b][oe:a]
(;W[oe];B[pf];W[pc];B[qb])

(;W[pc];B[qb];W[pf]C[Black continues with 'a' or 'b'.]LB[oe:b][qf:a]
(;B[qf];W[oe];B[pg];W[qe];B[of];W[qd]
C[But there is still aji in the corner....];B[pb];W[ob];B[rd];W[re];
B[sc];W[rb];B[ra]C['a' and 'b' are miai.]LB[pa:b][sb:a])

(;B[oe];W[qf];B[nd];W[nc];B[mc];W[md];B[ne];W[lc];B[mb];W[nb];B[lb];
W[kc];B[me];W[ld];B[ob];W[pb];B[pa];W[na];B[pd];W[kb];B[oc];W[la])
)
)
)
)

(;W[ph]C[Black gets out with 'a' or settles shape locally with 'b'.]
LB[qf:b][oe:a]
(;B[oe]C[Black keeps White separated.];W[md];B[ne];W[me];B[mf];W[lf];
B[mg];W[lg];B[mh];W[pk])

(;B[qf]C[Black settles his shape in sente.];W[kd])
)

(;W[nf]
C[White aims for influence at top, but gives away a large corner.];
B[oe];W[ne];B[nd];W[md];B[nc];W[mc];B[nb];W[mb];B[pg])

(;W[tt];B[kd];W[md];B[pg];W[mf];B[kf];W[mh])
)

(;B[qe]
C[
Ikken Biraki = Hankan Peollim = Chai Yi = 1-Space Extension
------------------------------------------------------------
]
;W[pc]C[Black continues with 'a' or 'b'.]LB[pd:b][qb:a]
(;B[qb]C[White continues with 'a' to 'c'.]LB[pf:c][of:b][ld:a]
(;W[ld])

(;W[of]C[Black continues with 'a', or plays elsewhere ('b').]
LB[dp:b][pg:a]
(;B[pg];W[kd])

(;B[tt]C[Black plays elsewhere.];W[qf];B[rf];W[pe];B[qd];W[qg];B[rg];
W[qh])
)

(;W[pf]
C[Black continues with 'a', or the fighting move (finally) of 'b'.]
(;B[qf];W[pg];B[qg];W[ph])

(;B[pe];W[oe];B[of]
C[White continues with 'a' or 'b'. White 'c' is not recommended.]
LB[pg:c][ph:b][qf:a]
(;W[qf];B[rf];W[rg];B[re];W[ph];B[og];W[pi];B[mf];W[md];B[mi])

(;W[ph]
C[White 10 is a tesuji.

Black continues with 'a'. Black 'b' is a mistake.]
LB[pg:b][nf:a]
(;B[nf];W[qf];B[rf]
C[White continues with 'a' or the fierce move at 'b'.]LB[rg:b][md:a]
(;W[md];B[rg];W[qh];B[nh];W[pk];B[jd])

(;W[rg];B[md];W[rd]C[White 16 is the vital point.];B[qd];W[re]
C[Black may try 'a' or 'b'.]LB[nc:b][ob:a]
(;B[ob];W[nc];B[oc];W[nd];B[mc];W[nb];B[pd];W[oa];B[pb];W[mb];B[lb];
W[lc];B[ld];W[kc];B[kb];W[jb];B[jc];W[kd];B[ib];W[me];B[le];W[mf]
C[White 40 is the vital point.])

(;B[nc];W[pb];B[rc];W[ra];B[qa];W[pa];B[oc];W[pd];B[sc];W[sf]
C[Black loses the capturing race.])
)
)

(;B[pg]C[Black 11 is a mistake.];W[og];B[qf];W[nf];B[oh];W[pf];B[qg];
W[pi];B[nh];W[oj];B[lh];W[lf])
)

(;W[pg]
C[White 10 is not recommended, as it is unnecessarily heavy. Variation
'a', the one-space jump, gives a more favorable result to White.]
;B[nf];W[md];B[oh];W[qi];B[rf];W[rg];B[mh];W[jd];B[pj];W[qj];B[pk])
)
)
)

(;B[pd];W[oc];B[oe];W[ne];B[of];W[qb])
)

(;B[qf]
C[
Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
-------------------------------------------------------------
])

(;B[pd]
C[
Kosumi-Tsuke = Diagonal Attach
-------------------------------

White continues with 'a' or 'b'. White 'c' is a mistake.
]
LB[pe:c][oc:b][oe:a]
(;W[oe]LB[pf:b][oc:a]
(;B[oc];W[nc];B[ob];W[pe];B[qe];W[qf];B[re];W[me])

(;B[pf];W[oc]LB[kc:b][pe:a];B[kc];W[pe];B[qe];W[qf];B[qg];W[rf];B[pg];
W[qb];B[rb];W[rd];B[qd];W[rc];B[pb];W[pc];B[qa];W[re];B[qb];W[ob];
B[rg];W[sb];B[sc];W[sd];B[sf];W[oa];B[sa];W[ra])
)

(;W[oc];B[pe];W[kc])

(;W[pe]C[White 4 is a mistake.];B[qe];W[pc];B[qd];W[oc];B[pf];W[oe]
C[Black extends with 'a' to 'c', depending upon the situation in
the lower right, or thwarts White at the top with 'd'.]
LB[jc:d][ph:c][qh:b][qi:a]
(;B[qi])

(;B[qh])

(;B[ph])

(;B[jc]
C[Black cannot afford to be any closer to the thick White stones.])
)
)

(;B[oc]C[
Tsuke
------

'A' or 'B'.
]LB[nc:B][pd:A]
(;W[pd];B[pc];W[nd];B[re];W[pg])

(;W[nc];B[nd];W[oe];B[mc];W[pc];B[nb];W[ob];B[nc];W[pd];B[pb];W[qb];
B[oa];W[rc])
)
)

(;W[nc]
C[
Nikken Kakari = Dukan Keolch'im = E`r Gua`jiao~ = 2-Space Low Approach
-----------------------------------------------------------------------

Black can thwart White's strategy with a play at 'a', ignore
White 2 ('b') or simply extend on 'c'.
]
LB[pe:c][dp:b][kd:a]
(;B[kd]
C[
Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia = 2-Space High Pincer
-----------------------------------------------------------------------------

White continues with 'a' or 'b'.
]
LB[qd:b][pd:a]
(;W[pd]C[Black continues with 'a' or 'b'.]LB[re:b][pc:a]
(;B[pc]C[White continues with 'a' or 'b'. White 'b' is tough-minded.]
LB[qd:b][oc:a]
(;W[oc];B[re];W[pf];B[qg];W[oh])

(;W[qd]C[White 6 provokes a fight.];B[oc];W[od];B[nd];W[md];B[ne];
W[mb];B[rd];W[re];B[rc];W[me];B[nf];W[pf];B[ob])
)

(;B[re];W[pc];B[qb])
)

(;W[qd];B[pd];W[pc];B[qe];W[rd];B[oc];W[pb];B[pe])
)

(;B[tt]C[
Tenuki
--------

Black plays elsewhere.
];W[qe]
C[Black continues locally with 'a', or Black can ignore White again,
and still live in the corner ('b').]
LB[dp:b][pd:a]
(;B[pd];W[pe];B[nd];W[md];B[ne])

(;B[tt]C[Black plays elsewhere again.];W[oe];B[ob];W[nb];B[oc];W[od];
B[rd];W[re];B[rb])
)

(;B[pe]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------
]
;W[kc];B[qi])
)

(;W[pc]C[White 2 is not recommended.];B[pd]
C[White 'a' is sensible (a change of strategy from the silliness
of White 2), but White 'b' is to be expected.]
LB[qd:b][oc:a]
(;W[oc];B[qd];W[od];B[qh];W[kc]
C[Of course, either player could have played on the fourth line
instead.])

(;W[qd]
C[Chances are that White had complications in mind with White 2,
hence the cross-cut.]
;B[rc]
C[Black could have as well played R18 rather than S17 (as shown).

Regardless of continuation, Black captures either White 2 or
White 4.]
;W[qe];B[oc])
)
)

(;B[qd]
C[
Komoku = Somok = Xiao~mu` = 3-4 Point
---------------------------------------------

The komoku (3-4) point is the traditional corner enclosure move.
White approaches with 'a *', 'b *', 'c *' or 'd *'. 

'e' covers enclosure (shimari) joseki.

White 'f', 'g' and 'h' are special strategies, usually against
the Chinese Fuseki.

'i' is not joseki, but simply an invasion to take the corner
after Black made a shimari-less moyo on top disabling the other
moves.

g7, f6, e5, d4, c3, b2, a1
]
LB[qc:i][qf:h][pg:g][qj:f][dp:e][od:d][nd:c][nc:b][oc:a]
(;W[oc]
C[
Ikken Kakari = Hankan Keolch'im = Yi Gua`jiao~ = 1-Space Low Pincer
--------------------------------------------------------------------

The small knight move is the basic approach move to the 3-4 point
stone. It has been continually used for over four centuries.
There are limitless variations, with new moves constantly being
discovered. White 2 opens the door to a treaure store of joseki.

Black responds with 'a *', 'b *', 'c', 'd *', 'e *', 'f' *, 'g
*', 'h *', 'i *', 'j', 'k' or plays elsewhere 'n'.
'a *' is the Shusaku joseki.
Black 'l' indicates a special strategy 
based upon favorable local position.
The variations after 'h' are manyfold, so this branching is as
complicated as the avalanche or taisha joseki.

'k' is somewhat a trick play. Black must have the ladder.

'm' is a trick play.

m13, l12, k11, j10, i9, h8, g7, f6, e5, d4, c3, b2, a1

outcomes:
a1, b2, c3, j10, k12 - Black right
d4, e5, g7, h8, i9 - White choice
f6 - variable
k11 - Black thick outside, White big corner
m13 - Black right high, White top territory
]
PL[1]
LB[oe:m][pc:l][nd:k][od:j][kd:i][ld:h][md:g][kc:f][lc:e][mc:d][qg:c][pf:b][pe:a][dp:n]
(;B[pe]
C[
Shusaku Kosumi = Shusaku's Diagonal Move
-----------------------------------------

Black 3, the famous Shusaku diagonal move, is a steady way of
responding to White's kakari. Black can now aim to press against
the lone White stone with 'a'.

White's possible local responses are 'a *' through 'd' or 'h'.
White 'a *': White must be prepared to fight.
White 'b *': secure.
White 'c *': invites sacrifice.
White 'd': played as an extension from the top left; invites
invasion.
'e'.

Variation 'f' shows Black continuations when White plays elsewhere.

White 'g' is an Edo period (1600-1867) joseki that has since
been abandoned as unfavorable to White.

f6, e5, d4, c3, b2, a1
]
LB[qc:h][nd:g][dp:f][qi:e][jc:d][kc:c][lc:b][md:a]
(;W[md]
C[White must be prepared for a fight. Black finishes the joseki
with 'a *', or starts a fight with 'b'.]
LB[kc:b][qj:a]
(;B[qj];W[ic]C[
* GOOD VARIATION *];B[pc]
C[Continuation. The difference between Black and White playing
here (White at R18) is nearly 20 points. This is a large endgame
move.]
;W[od];B[pb])

(;B[kc]
C[Black must consider the upper left corner when playing this way.
Without support this is an overplay for Black.

White attacks the lone Black stone with 'a' (joseki), or slides
in the corner with 'b', which is not joseki, as 'b' has problems.]
LB[qb:b][hd:a]
(;W[hd];B[ke];W[mf])

(;W[qb]C[The slide of White 6 is not recommended.];B[qi]
C[White doesn't have a good follow-up. Black 'a' is intolerable,
but White 'b', Black 'c' is not favorable to White.]
LB[kd:c][lc:b][mb:a])
)
)

(;W[lc]
C[Black continues with 'a' or possibly 'b *'. Playing elsewhere
('c'; tenuki) is not joseki.

c3, b2, a1]
LB[dp:c][qj:b][pc:a]
(;B[pc];W[od];B[pg])

(;B[qj]
C[White continues with 'a *'. White 'b' gives Black a chance for
moyo.]
LB[qb:b][ne:a]
(;W[ne];B[pc];W[ob];B[pg]C[
* GOOD VARIATION *])

(;W[qb];B[nd];W[nc];B[le])
)

(;B[tt]C[Black plays elsewhere (not joseki).];W[qb]
C[White makes ideal shape if Black plays elsewhere.];B[qi])
)

(;W[kc]
C[The three-space extension is a light move and is most often used
in actual games.
'A *' is joseki, 'B is a mistake.]
LB[pc:B][mc:A]
(;B[mc]
C[White continues with 'a *' or 'b'. White 'a' leads to capture
of Black 5 at top. White 'b' leads to thickness at the loss of
territory.]
LB[mb:b][oe:a]
(;W[oe];B[of];W[ne]C['A *' is correct, 'B' is wrong.]LB[pc:B][pg:A]
(;B[pg];W[ld];B[pc];W[ob]C[
* GOOD VARIATION *])

(;B[pc];W[ob];B[pg]
C[White can now tenuki, because Black played his moves in the wrong
order.])
)

(;W[mb]
C[Black continues with 'a' or 'c'. Black 'b' is a mistake.
'd' is a trick play.]
LB[pc:d][qj:c][nb:b][lb:a]
(;B[lb];W[lc];B[nb];W[md];B[nc];W[nd]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[kb:b][od:a]
(;B[od];W[ob];B[ma];W[oa];B[na];W[kb];B[pc];W[oe];B[pd];W[of])

(;B[kb]C[Black 13 is a mistake.];W[ob];B[ma];W[oe]
C[No matter what Black does, White can play at 'a' or 'b', either
of which are severe.]
LB[of:b][jc:a])
)

(;B[nb]C[Black 7 is a mistake in direction.];W[nc];B[lb];W[md];B[lc];
W[ld];B[ob];W[kb];B[ma];W[ke];B[pc]
C[White has made good shape in sente. If Black cuts at 'a', White
sacrifices the two White stones.]
LB[nd:a])

(;B[qj];W[md];B[pc];W[ob])

(;B[pc]C['A' is correct, 'B' or 'C' is getting tricked.]
LB[ob:C][od:B][md:A]
(;W[md])

(;W[od];B[pb])

(;W[ob];B[od])
)
)
)

(;B[pc];W[od]C[White gets an ideal extension.])
)

(;W[jc]
C[The four-space extension of White 4 is often played in relation
to stones in the upper left corner. This extension, however,
is quite wide and if Black invades, it is impossible to determine
how the sequence will develop, so White must be ready for anything.

Black continues with 'a' or 'b'.]
LB[lc:b][nd:a]
(;B[nd];W[nc]C[Joseki continues with Black 'a', not 'b'.]
LB[md:b][ld:a]
(;B[ld]C[White continues with 'a', not 'b'.]LB[od:b][mc:a]
(;W[mc];B[ne];W[lc];B[qj])

(;W[od]C[White 8 is vulgar.];B[oe];W[md];B[me];W[ne];B[nf]
C[White must play at 'a', not 'b'.]LB[le:b][lc:a]
(;W[lc];B[nd];W[mc])

(;W[le]C[White 14 is a mistake.];B[nd];W[mc];B[kd]
C[Black has thickness and White must still defend the left side.])
)
)

(;B[md]C[Black 7 is poor.];W[mc];B[ld];W[lc]
C['a' and 'b' are miai, to Black's disadvantage.]LB[qj:b][kd:a])
)

(;B[lc];W[oe];B[of];W[ne]
C[Black continues with 'a'. Black 'b' is unreasonable.]LB[le:b][pc:a]
(;B[pc]C[White continues with 'a'. Black 'b' is not as favorable.]
LB[nb:b][pb:a]
(;W[pb];B[qb];W[le];B[qj]C[Later Black wants to play A.]LB[kd:A])

(;W[nb])
)

(;B[le]C[Black 9 is unreasonable.];W[pf]LB[pg:B][og:A]
(;B[og];W[qf])

(;B[pg];W[qf];B[qg];W[re]
C[White captures the two Black stones by playing 'a' or 'b'.]
LB[rd:b][rg:a])
)
)
)

(;W[qi]
C['A' is the usual variaton, 'B' and tenuki 'C' are possible. 'D'
is a mistake.]
LB[nd:D][dp:C][pc:B][lc:A]
(;B[lc]LB[md:D][oe:C][qb:B][nd:A]
(;W[nd];B[pc];W[id];B[le];W[nf];B[lg];W[nh])

(;W[qb];B[nd];W[nc];B[md];W[rc])

(;W[oe];B[of];W[ne];B[pc];W[pb];B[qb];W[id];B[le])

(;W[md];B[ld];W[me];B[le];W[mf];B[pc])
)

(;B[pc];W[od];B[ld];W[nf])

(;B[dp];W[qf];B[pf];W[qg];B[pc];W[od];B[qe])

(;B[nd];W[nc];B[md];W[mc];B[ld];W[kc]
C[The Black wall is senseless with White 4.]LB[qi:4])
)

(;W[tt]
C[White plays elsewhere. Black continues with 'a' to 'c'.

Black 'a': gives White territory.
Black 'b', 'c': White choice of territory or outside fighting.]
LB[kc:c][lc:b][nd:a]
(;B[nd]
C[White continues with 'a'. White 'b' is slow and produces a heavy
shape.]
LB[nc:b][mc:a]
(;W[mc]
C[The exchange of the pressing play of Black 5 and White 6 is the
classical way of handling this position. Nowadays, however, players
do not like to give White secure territory so this joseki is
not used very often.

Black can play elsewhere or continue locally with 'a', 'b', 'c'
or 'd'.]
LB[nc:d][qj:c][kc:b][ld:a]
(;B[ld]
C[White continues with 'a' or 'd'. White 'b' leads to a trap. White
'c' gives White life in sente.]
LB[lc:d][qc:c][md:b][lb:a]
(;W[lb];B[md];W[jc])

(;W[md];B[me];W[le];B[lc]
C[White continues with 'a'. White 'b' is a mistake. White 'c' confines
White completely.]
LB[mb:c][ne:b][nc:a]
(;W[nc];B[ne];W[lb];B[kb];W[ma];B[jd];W[qb])

(;W[ne]C[White 12 is a mistake.];B[mf];W[od];B[nf];W[oe];B[mb]
C[White continues with 'a'. White 'b' is a mistake.]LB[of:b][nc:a]
(;W[nc];B[of])

(;W[of]C[White 18 is a mistake.];B[nc];W[pf];B[qf];W[qg];B[rg]
C[White continues with 'a'. White 'b' is unreasonable.]LB[rf:b][qh:a]
(;W[qh];B[rh];W[qi];B[ri];W[qj];B[qc])

(;W[rf]C[White 24 is unreasonable.];B[qe];W[rh];B[pg];W[qh];B[og];
W[qc];B[rc];W[qb];B[rb];W[re];B[rd];W[ob];B[ra]
C[Black must play 37, not 'a'. White cannot save the stones in
the corner.]
LB[qa:a])
)
)

(;W[mb];B[ke];W[lf];B[lb]
C[White may try the cut at 'a' or attachment at 'b'.]LB[qc:b][ne:a]
(;W[ne];B[mf];W[nf];B[mg];W[od];B[ng]
C[White may try 'a' or 'b'. Neither work.]LB[pf:b][of:a]
(;W[of];B[pg])

(;W[pf];B[qf];W[pg];B[qg];W[ph];B[of];W[oe];B[og];W[qb];B[pi]
C[Black 31 is the nose attachment (hana-tsuke) tesuji.];W[qh];B[qi];
W[oh];B[rh]C[The five White stones will have trouble.])
)

(;W[qc];B[rc];W[pc];B[nf];W[rb];B[rd];W[sb];B[kf];W[lg];B[kg];W[lh];
B[nh])
)
)

(;W[qc];B[rc];W[pb];B[qb];W[pc]C[Black continues with 'a', not 'b'.]
LB[rb:b][md:a]
(;B[md];W[rb];B[sb];W[ra];B[re])

(;B[rb]C[Black 13 is a mistake.];W[oe]C[White escapes to the center.])
)

(;W[lc]
C[The move was played by Kim Shujun 7P against Iyama Yuta 4P in
the first game of the Shinjin-O-title 2005]
;B[kd];W[kc];B[jd];W[md];B[me];W[jc];B[id];W[hc]
C[Later, White has a kikashi on A.]PL[2]LB[of:A];W[of];B[ne])
)

(;B[kc]
C[Black plays this way to emphasize the top. White continues with
'a' or 'b' ('b' to thwart Black's plan).]
LB[ic:b][md:a]
(;W[md]LB[ke:B][hc:A]
(;B[hc])

(;B[ke];W[ne];B[pc])
)

(;W[ic];B[ld];W[qc]C[White tries to live.];B[rc];W[rb])
)

(;B[qj])

(;B[nc];W[nb]C['A' or 'B'.]LB[ob:B][mb:A]
(;B[mb];W[lb];B[ob];W[ma];B[od])

(;B[ob];W[pb];B[mb];W[oa];B[lc];W[od];B[ne];W[oe];B[of];W[pf])
)
)

(;W[nc]C[White 6 is poor.];B[md]
C[White continues with 'a'. White 'b' involves a ladder.]
LB[lc:b][mc:a]
(;W[mc];B[ld];W[kc];B[qj])

(;W[lc]C[Black plays 'a' with a favorable ladder, Black if not.]
LB[ld:b][mc:a]
(;B[mc]C[Black must have the ladder to play this way.];W[mb];B[nb]
C[Black plays this way then the ladder to capture 8 is favorable.
White continues with 'a' or 'b'.]
LB[lb:b][ob:a]
(;W[ob];B[lb];W[na];B[kc])

(;W[lb];B[ob];W[pc];B[pb];W[qc];B[qb];W[rb];B[rc];W[rd];B[sc];W[sd];
B[re];W[sb];B[rc]C[White loses.])
)

(;B[ld];W[kc];B[mc];W[mb];B[lb];W[nb];B[jc]
C[Black 15 is a tesuji. White must play 'a', not 'b'.]LB[kd:b][kb:a]
(;W[kb];B[kd])

(;W[kd]
C[White 16 is a mistake. The White stones below will be captured.];
B[kb])
)
)
)
)

(;B[lc]C[White continues with 'a' or 'b'. White 'c' is a mistake.]
LB[oe:c][qb:b][nd:a]
(;W[nd]C[Black continues with 'a' or 'b'.]LB[ic:b][pc:a]
(;B[pc];W[id];B[le];W[nf];B[lg];W[nh])

(;B[ic];W[qb];B[qi];W[rc])
)

(;W[qb];B[nd];W[nc];B[md];W[rc])

(;W[oe]C[White 6 is a mistake.];B[of];W[ne];B[le];W[nf];B[og])
)

(;B[kc]
C[White continues with 'a' or 'b'. White 'c' is also possible if
White greatly favors the top.]
LB[ic:c][qb:b][mc:a]
(;W[mc];B[pc];W[me];B[ke];W[mg])

(;W[qb];B[nd];W[nc];B[md];W[lb];B[kb];W[lc];B[ld];W[rc];B[je])

(;W[ic];B[nd];W[mc];B[ld]
C[The same as variation as Black 7 and White 8 are played before
Black 5 and White 6..]
LB[ic:6][kc:5][mc:8][nd:7];W[qc];B[rc];W[rb])
)
)

(;W[nd]
C[White 4, known as the "double diagonal move", is no longer joseki,
as Black gets a favorably thick shape.]
;B[ne];W[me];B[nf];W[kc];B[mf])

(;W[qc];B[rc];W[pc];B[re];W[lc])
)

(;B[pf]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

The knight's move of Black 3 is a quiet response to White's kakari.
It is not as solid as the diagonal play but it is more flexible,
since Black can make a wider extension along the right side.

The main difference between the diagonal play and the knight's
move is that White has the option of attaching at 'a *'. White
'b' through 'd' are other options, depending upon strategic considerations.

Variation 5 illustrates White playing elsewhere.

e5, d4, c3, b2, a1
]
LB[dp:e][qh:d][kc:c][lc:b][qc:a]
(;W[qc];B[rc];W[pd]C[Black continues with 'a *' or 'b *'.]
LB[qb:b][qe:a]
(;B[qe];W[qb];B[qj]C[
* GOOD VARIATION *])

(;B[qb]C[White continues with 'a *'. White 'b' creates bad shape.]
LB[pc:b][qe:a]
(;W[qe];B[pc];W[rd]
C[Black continues with 'a *'. Black 'b', provoking a ko, is unreasonable.]
LB[od:b][qc:a]
(;B[qc];W[pe];B[od];W[oe];B[nd];W[lc];B[ne];W[of];B[nc]
C[
* GOOD VARIATION *])

(;B[od]C[Black 11 is unreasonable. There is no ko threat big enough.];
W[qc])
)

(;W[pc]C[White 8 is not recommended.];B[qe];W[lc])
)
)

(;W[lc]
C[Black continues with 'a'. There is no reason to immediately play
'b'.]
LB[qj:b][pc:a]
(;B[pc];W[od];B[ph])

(;B[qj]C[Black 5 is premature.];W[qc];B[rc];W[pd];B[qe]
C[White can play elsewhere or 'a'. If Black 'a', White 'b'.]
LB[pb:b][qb:a])
)

(;W[kc]C[Black continues with 'a' or 'b'.]LB[mc:b][ic:a]
(;B[ic];W[qc];B[rc];W[pd];B[qe];W[qb];B[qj])

(;B[mc]C[Black continues with 'a', or may try 'b'.]LB[qc:b][mb:a]
(;W[mb];B[lb];W[lc];B[nb];W[md];B[nc];W[nd];B[od];W[ob];B[ma];W[oa];
B[na];W[kb];B[pc];W[oe];B[pd])

(;W[qc];B[rc];W[pd]C[Black continues with 'a'. Black 'b' is weak.]
LB[qe:b][qb:a]
(;B[qb];W[qe];B[pc];W[rd];B[qc];W[pe];B[od];W[oe];B[nd])

(;B[qe]C[Black 9 is weak.];W[mb])
)
)
)

(;W[qh]
C[White plays this way when the right is important.
'A' or 'B'.]
LB[kc:B][mc:A]
(;B[mc];W[md];B[ld];W[nd];B[pc];W[pb];B[qb];W[pd];B[qc];W[lc];B[kc];
W[lb];B[kd];W[mb])

(;B[kc]C[Black plays 2 or 'a', depending on whole board strategy.]
LB[pk:a])
)

(;W[tt]
C[White plays elsewhere (tenuki). Black 'a' and 'b' are possible
follow-ups.]
LB[pc:b][kc:a]
(;B[kc]C[White continues with 'a' to 'c'.]LB[ld:c][mc:b][qc:a])

(;B[pc]
C[White 'a' is a light move; White could also play elsewhere. White
'b' is a mistake.]
LB[od:b][kc:a]
(;W[kc])

(;W[od]C[White 6 is a mistake. White creates a target for attack.];
B[ld])
)
)
)

(;B[qg]
C[
Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
-------------------------------------------------------------

The primary objective of Black 3 is to ensure his own safety
rather than attack White. If White is thick at the bottom, Black
3 serves to forestall an attack while erasing that thickness.
That this is a negative attitude is undeniable.

White's local responses include 'a' through 'c'. Playing elsewhere
is also usual, as Black has already played submissively.
]
LB[jc:c][kc:b][pf:a]
(;W[pf];B[qf];W[qc];B[rc];W[pd]
C[Black continues with 'a'. Black 'b' is unreasonable.]LB[qb:b][qe:a]
(;B[qe];W[qb])

(;B[qb];W[qe];B[pc];W[rd];B[qc];W[rf];B[od];W[pe];B[nc]
C[Black position is weak as White can aim at extending at 'a'.]
LB[ob:a];W[qi])
)

(;W[kc];B[mc]C[White continues with 'a' or 'b'.]LB[pf:b][mb:a]
(;W[mb];B[lb];W[lc];B[nb];W[md];B[nc];W[nd];B[od];W[ob];B[ma];W[oa];
B[na];W[kb];B[pc];W[oe];B[pd])

(;W[pf]C[Black continues with 'a' or 'b'.]LB[od:b][qf:a]
(;B[qf];W[mb]C[Black continues with 'a'. Black 'b' is reckless.]
LB[lb:b][pe:a]
(;B[pe];W[md])

(;B[lb]C[Black 9 won't work.];W[lc];B[nb];W[md];B[nc];W[nd];B[od];
W[pd];B[oe];W[pe])
)

(;B[od]C[White continues with 'a'. White 'b' is not joseki.]
LB[nd:b][qf:a]
(;W[qf];B[pc]
C[The swap is locally favorable for Black, but given White thickness
at right-bottom, White should be okay.])

(;W[nd];B[oe];W[nc];B[pc]
C[Black 11 makes nice shape.
White continues with 'a'. White 'b' is unreasonable.]
LB[qf:b][md:a]
(;W[md];B[qf])

(;W[qf]C[White 12 is unreasonable.];B[ne];W[md];B[rf];W[re];B[rh]
C[If White 'a', Black 'b', and White is in trouble.]LB[og:b][qe:a])
)
)
)
)

(;W[jc];B[lc]C[White continues with 'a' to 'c'.]LB[of:c][gc:b][pf:a]
(;W[pf]C[Black continues with 'a'. Black 'b' is bad.]LB[od:b][qf:a]
(;B[qf];W[qc];B[rc];W[pd]C[Black continues with 'a' or 'b'.]
LB[qb:b][qe:a]
(;B[qe];W[qb];B[le])

(;B[qb];W[qe];B[pc];W[rd];B[qc];W[rf];B[od];W[pe];B[nd])
)

(;B[od]C[Black 7 is a mistake.];W[nd];B[oe];W[pc];B[nc];W[ne]
C[White 12 makes miai of 'a' and 'b'. Black is in trouble.]
LB[pd:b][mc:a])
)

(;W[gc];B[pc];W[od];B[pf];W[me];B[le];W[lf];B[ke];W[mg])

(;W[of]
C[This reverts to the variation where Black 5 and White 6 are played
before Black 3 and White 4.]
LB[jc:4][of:6][lc:5][qg:3];B[me])
)
)

(;B[mc]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

This is the severest attacking move, emphasizing Black's advantage
from playing first in the corner. The feature of the one-space
pincer is that it does not permit White to swtich lightly elsewhere.
Many top-flight professionals are fond of this move.

White's possible responses are 'a *', 'b *', 'c *', 'd *', 'e
*' to 'f'. 'f' is not joseki.

White 'g' is sometimes seen in amateur games, and is not joseki.

g7, f6, e5, d4, c3, b2, a1

outcomes:
a1, b2 - White takes the top
c3 - different outcomes
d4 - White gets the corner or right, depending on Black
]
LB[pd:g][ne:f][dp:e][qc:d][md:c][oe:b][pe:a]
(;W[pe]
C[The point of White 4 is to block at 'b' if Black plays elsewhere.

Black continues with 'a *' or 'b' in joseki.

Black 'c' is a trick play, the aim to induce White 'b' and use
the Black corner stone as a sacrifice in order to squeeze White.

Black 'd' is a mistake.]
LB[qf:d][qg:c][qe:b][pd:a]
(;B[pd];W[od];B[oe]
C['A *' is joseki, 'B' is questionable. 'C' takes sente.]
LB[md:C][qe:B][ne:A]
(;W[ne];B[of];W[md]
C[Black continues with 'a *' or 'b'.
'c' is a trick play.]
LB[pb:c][ld:b][pf:a]
(;B[pf];W[lc]
C[
* GOOD VARIATION *

Black continues at 'a'. To play elsewhere ('b') invites White
to gain influence in the center. 'a' is a junction point for
both players.]
LB[dp:b][nf:a]
(;B[nf]
C[White must continue at 'a'. Black will dominate if White plays
elsewhere ('b').]
LB[dp:b][mf:a]
(;W[mf];B[mg];W[lf];B[lg];W[kf];B[qk])

(;W[tt]C[White plays elsewhere, a mistake.];B[me];W[nd];B[le];W[ld];
B[ke])
)

(;B[dp]C[Black plays elsewhere, a mistake.];W[nf]
C[Black continues at 'a'. The hane of Black 'b' is unreasonable.]
LB[ng:b][oh:a]
(;B[oh];W[ng];B[ph]
C[Black should not play 17 at 'a', as it leaves 'b' for White to
aim at.]
LB[qh:b][pi:a])

(;B[ng]C[Black 15 is unreasonable.];W[og];B[oh];W[pg];B[qf];W[qg]
C[Black may try 'a' or 'b'.]LB[pi:b][rf:a]
(;B[rf];W[pi])

(;B[pi];W[rf];B[qe];W[rh];B[qi];W[ri]
C[Black is at a loss for continuation. If Black 'a', White takes
Black's eye in the corner with 'b' and Black loses the fight.
If Black 'b', White 'a'. Black's tactics have not worked out.]
LB[qb:b][qk:a])
)
)
)

(;B[ld]LB[le:A][lc:B]C['A' is correct, 'B' is a mistake.
]
(;W[le];B[kd];W[ke];B[jd]
C['A' is the modern Korean variation, 'B' a similar older Japanese
variation.]
LB[re:B][je:A]
(;W[je];B[id];W[re];B[qb];W[qe];B[ob];W[pc];B[qc];W[pb];B[nc];W[nd];
B[pa];W[nb];B[oa];W[mb];B[lc];W[nf];B[og];W[rc];B[ra];W[rb];B[lb];
W[rd];B[qa];W[ng];B[oh];W[qh];B[nh];W[mh];B[mi];W[lh];B[li];W[kh];
B[qi];W[rh];B[oj])

(;W[re]C[A tesuji.];B[qb]C[White continues with 'a' or 'b'.]
LB[pf:b][qe:a]
(;W[qe];B[ob];W[pc];B[qc];W[pb];B[nc]LB[nd:A][nb:B]
C['A' is joseki, 'B' -> disadvantageous ko.
]
(;W[nd];B[pa];W[nb];B[oa];W[mb];B[lc]LB[nf:A][rc:B]
C[Playing 'A' is important now, playing 'B' now is bad.
]
(;W[nf];B[og];W[rc]
C[Black continues with the tesuji of 'a'.
Black 'b' leads to collapse.
Black 'c' gives White a favorable ko or huge influence..
Black 'd' leads to the same ko.
]
LB[lb:c][rd:b][ra:a][rb:d]
(;B[ra]LB[ng:A][rd:B]TR[pj]
C['A' is usual. 'B' enlargens the White eye space, if there is an additional Black stone, e.g. on the triangled position.
]
(;W[ng];B[oh];W[qh])

(;AB[pj];W[rd];B[lb];W[rb];B[qa];W[qh];B[ph];W[qi];B[qj])
)

(;B[rd];W[rb];B[sd];W[ra];B[qa];W[se])

(;B[lb]C[Black 33 ends in Black gote, at best.];W[ra]
C[Black 'a' is correct. Black 'b' leads to an unecessary ko.]
LB[rb:b][qa:a]
(;B[qa];W[rb];B[ma];W[rd];B[na];W[ng]
C[Whtie is alive in the corner and can strongly attack the Black central group.
]
;B[oh];W[nh];B[oi];W[nk];B[rf]C[Later, this is sente for Black.
];
W[se];B[rh])

(;B[rb]C[Black 35 leads to an unnecessary ko.];W[rd];B[qa];W[sb])
)

(;B[rb];W[rd]LB[lb:A][sb:B]C['A' gises a less bad result than 'B'.
]
(;B[lb];W[sb];B[qa];W[ra];B[sa])

(;B[sb];W[ra];B[lb];W[qa];B[sa];W[qa])
)
)

(;W[rc];B[nf];W[me];B[ra])
)

(;W[nb];B[nd];W[oa];B[mb];W[qa];B[ra];W[rb];B[pa]
C[The ko is bad for White.
])
)

(;W[pf];B[og];W[pc];B[qc]
C[White continues with 'a', or 'b' to prevent connection.]
LB[pb:b][qh:a]
(;W[qh];B[nc];W[nd];B[ob];W[pi])

(;W[pb]
C[White prevents connection of the two Black groups. Played properly
by Black, White loses points in the corner.]
;B[qe];W[qf];B[rf];W[rg];B[sf]
C[White continues with 'a'. Capturing the two Black stones ('b'
or 'c') leads to a loss for White, as Black throws in at Black
25.]
LB[se:c][sg:b][ph:a];W[ph];B[rd];W[qi])
)
)
)

(;W[lc];B[kc];W[lb];B[kd];W[mb];B[me];W[nd];B[nf])
)

(;B[pb];W[qe];B[re];W[qf];B[nf];W[mf];B[mg];W[lg]
C[White avoided being tricked.];B[mh];W[rf];B[rd];W[oh];B[nh];W[oi];
B[lf];W[me];B[kf];W[lc];B[kh])
)

(;W[qe]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.]
;B[re];W[rf];B[rd])

(;W[md]C['A' is ok. 'B' is possible.]LB[ld:B][ne:A]
(;B[ne];W[lc];B[pf])

(;B[ld];W[me]C['A' is better than 'B'.]LB[kc:B][pf:A]
(;B[pf];W[ne];B[of];W[lc];B[kc];W[lb];B[kd];W[mb])

(;B[kc];W[qe];B[re];W[rf];B[rd];W[qg];B[pb];W[of])
)
)
)

(;B[qe];W[pf];B[qg]
C[White continues with 'a'. White 'b' takes the corner and tries
to avoid a large scale fight.]
LB[qc:b][jc:a]
(;W[jc];B[me];W[pg];B[qh];W[ph];B[pi];W[qf];B[rf];W[rg];B[rh];W[re];
B[sg];W[qc];B[rd];W[oi])

(;W[qc]
C['A' aims to attack the lower right corner, 'B' initiates furikawari.]
LB[pd:B][pg:A]
(;B[pg]C['A' is correct, 'B' possible.]LB[pd:B][rc:A]
(;W[rc])

(;W[pd]C[Later, 'A' and 'B' are sente aiming at 'C'.]
LB[rc:C][qi:B][rh:A])
)

(;B[pd]
(;W[od];B[pc];W[pb];B[qb];W[qf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[rf:b][ob:a]
(;B[ob];W[rg])

(;B[rf]C[Black cannot afford to play 'b'.];W[rc];B[rd];W[rb]
C[White make small life in the corner and has some thickness.])
)

(;W[pc]
C[White 10 is a mistake: Black's resulting thickness is excellent.];
B[od];W[nc];B[nd];W[mb];B[lc];W[lb];B[kc])
)
)
)

(;B[qg]
C[Black 5 is a trick play.

White naturally wants to reply at 'a', which is okay given the
proper follow-up.

The light move at 'b' is also feasible. White 'c' is interesting
as well.]
LB[md:c][me:b][qe:a]
(;W[qe]C[Black may try 'a' or 'b'.]LB[re:b][pd:a]
(;B[pd];W[od];B[re]C[White 'a' is bad. White has to defend with 'b'.]
LB[of:b][rf:a]
(;W[rf];B[rd];W[qf];B[oe];W[of];B[ne];W[qb];B[rg]
C[White 'a' and 'b' are both bad.]LB[sg:b][sf:a]
(;W[sf];B[pg];W[pf];B[pc];W[pb];B[ob];W[nb];B[nc];W[oa];B[nd];W[ob];
B[ng];W[rc];B[nf];W[sd];B[og];W[se];B[sg];W[qc])

(;W[sg];B[pg];W[pf];B[rb];W[qc];B[rc]
C[Neither White 'a' nor 'b' work.]LB[ra:b][nb:a]
(;W[nb];B[se];W[sf];B[ra]
C[White must find life for the five White stones in the corner.];W[mb]
C[Crawling along the second line is terrible.];B[lc];W[lb];B[kc];W[kb]
;B[jc])

(;W[ra];B[pc];W[pb];B[ob];W[nb];B[oa];W[na];B[nc];W[pa];B[ob];W[oa];
B[nd])
)
)

(;W[of];B[rc]C[Black 11 is necessary.];W[ld]
C[White gets thick with 12.])
)

(;B[re]
C[White continues with 'a' or 'b'. 

Shusaku played White 'c' when Ota Yuzo played this trick play
against him. An exchange results, but the position is not desirable
for either player.

White must not hane at 'd'.]
LB[rf:d][md:c][ne:b][pd:a]
(;W[pd];B[rd];W[qc];B[rc];W[qb])

(;W[ne];B[rc];W[ld])

(;W[md];B[pd];W[lc];B[oe])

(;W[rf]
C[White falls into what is known as the "nineteen point trick move".
White's profit is 19 points in gote, but in the process gives
Black walls of steel. The dangerous thing about this trick is
that White's moves along the way seem natural.]
;B[rd];W[qf];B[pd];W[od];B[oe];W[of];B[ne];W[qb];B[pc];W[pb];B[ob];
W[nb];B[nc];W[oa];B[nd];W[ob];B[rg];W[sf];B[pg];W[pf];B[ng];W[rc];
B[og];W[qc];B[nf];W[sd])
)
)

(;W[me];B[qe];W[jd])

(;W[md];B[ld];W[me];B[nc];W[nd];B[kc];W[qe];B[ob];W[pc])
)

(;B[qf]C[Black 5 is a mistake.]
(;W[qe];B[re];W[pd]
C[Black plays 'a' and surrenders the corner, or 'b' and gives White
influence for some territory.]
LB[rd:b][qc:a]
(;B[qc]C[Black 9 is a sacrifice.];W[rf];B[rg];W[rd];B[sf];W[rc])

(;B[rd]C[Black 9 aims to keep Black's stones together.];W[ph];B[qh];
W[pi];B[qi];W[pj])
)

(;W[pf]
C[White 6 lets Black correct the defect in shape (the gap between
Black 1 and 5).]
;B[qg];W[pg];B[qh])
)
)

(;W[oe]
C[The one-space jump of White 4 is the smoothest move and is very
common in actual play. White 4 is a good start to a counter attack.

Black continues with 'a *'. 

Black 'b' is slow.

Black 'c' is a trick play.

Black 'd' is an overplay.]
LB[pg:d][pc:c][qg:b][pf:a]
(;B[pf]
C[Black 5 is the only possible good response by Black. White continues
with 'a *' or 'b *'. White 'b' is servere.

White 'c' is a trick play.]
LB[qc:c][ph:b][ld:a]
(;W[ld]
C[Joseki continues with 'a *' or 'b'.
'c' is similar to 'a' and avoids the possibilities of complications.]
LB[lc:c][md:b][pc:a]
(;B[pc]
C[White continues with 'a' or 'b *'. White 'b' can lead to complications.]
LB[ob:b][pb:a]
(;W[pb];B[qb];W[pd];B[qc];W[md])

(;W[ob]
C[Black continues with 'a *' or 'b'. Black should only play 'b'
if the right is very important, because Black 'b', White 'a',
and White is better off locally.

Black 'c' is a mistake.]
LB[md:c][of:b][lc:a]
(;B[lc];W[kd];B[md];W[me]C[Joseki continues with 'a *'.]LB[nd:b][kc:a]
(;B[kc];W[jd]C[Black continues with 'a *' or 'b'. 'c' is a mistake.]
LB[nd:c][jc:b][ic:a]
(;B[ic];W[nd];B[ph]C[
* GOOD VARIATION *])

(;B[jc]
C[White must play 'a', not 'b'. While White 'a' lets Black extend
on the fourth line, a minus for White, White's followup extension
at 'b' is a considerable minus for Black, so balance is maintained.]
LB[id:b][of:a]
(;W[of]C[Black continues with 'a' or 'b'.]LB[id:b][pg:a]
(;B[pg];W[id];B[hc])

(;B[id];W[pg];B[qg];W[pe];B[qf];W[qe];B[re];W[qh]
C[White's superiority on the right is assured, whatever Black does.
This variation is a kind of exchange.])
)

(;W[id]C[White 16 is a mistake.];B[ne]
C[After Black 17, there is no way White can salvage the situation.

White 'a' is about the best response, resulting in a Black ponnuki
toward the center.

White 'b' leaves cutting points, so is hopeless.

White 'c' looks more promising than it is. Black gets great outside
influence.]
LB[nd:c][nf:b][pe:a]
(;W[pe];B[qe];W[of];B[mf]
C[White 'a' gives Black a center-facing ponnuki (in sente). White
'b' and White lives in the corner in sente, but mistakes in the
order of moves can yield frightening results. Neither result
is favorable for White.]
LB[le:b][pg:a]
(;W[pg];B[qf];W[og];B[le])

(;W[le];B[od];W[pd];B[nd];W[qc];B[og];W[pb];B[nf];W[pc];B[pg])
)

(;W[nf];B[nd]C[White has cutting points at 'a' and 'b'.]LB[of:b][od:a])

(;W[nd];B[nf];W[of];B[og];W[ng];B[mf];W[pg];B[oh];W[pe];B[qf];W[qe];
B[re]C[Black has defects but White is short of liberties.];W[rf];B[qg]
;W[rd];B[od];W[se];B[pd];W[re];B[ph]
C[Black gets overwhelming outside influence.

White can play atari at 'a' to squeeze Black to get life in the
corner, but this is small compensation for White.]
LB[pb:a])
)
)

(;B[nd];W[od];B[ne];W[of];B[mf];W[pg])
)

(;B[nd]
C[Black 13 is not described in the joseki books. Variations are
possible, even likely.]
;W[od];B[ne];W[of];B[nf];W[pg];B[qg];W[ng];B[mf];W[qe];B[ph];W[og];
B[re];W[pd];B[qc];W[rf];B[qf];W[pe];B[sd];W[qh];B[rg];W[rh];B[sf];
W[pi])
)

(;B[of];W[lc]
C[It is regrettable for Black to let White settle his stones with
White 10, so this variation is only playable if Black 9 works
extremely well on the right side.])

(;B[md]C[Black 9 is a mistake.]LB[me:b][lc:a]
(;W[lc]C[Black may try 'a' or 'b'.]LB[lb:b][me:a]
(;B[me];W[mb];B[of];W[kb]
C[White 14 ensures connection.

The three Black stones are worthless.])

(;B[lb];W[me];B[kc];W[le]C[Black's shape is thin.])
)

(;W[me]C[White 10 lets Black get away with the mistake of playing 9.];
B[lc];W[kd];B[kc];W[jd];B[ic])
)
)
)

(;B[md];W[me]C['A' is usual. 'B' is disadvantageous.]LB[le:B][lc:A]
(;B[lc];W[kd];B[kc];W[jd];B[ic];W[he];B[hc]
C[Later, Black cutting on 'A' or 'B' helps White.]PL[2]LB[ne:B][nd:A]
(;B[nd];W[ne];B[od];W[pe];B[pd];W[qe])

(;B[ne];W[nf];B[nd];W[of];B[od];W[pe];B[qe];W[pd];B[pc];W[qc];B[pb];
W[rc];B[ob];W[qf])
)

(;B[le]
C[White continues with 'a' or 'b' if the ladder to catch Black
9 is favorable, or with 'c' if the ladder is unfavorable.]
LB[of:c][ke:b][lc:a]
(;W[lc]C[Black may try 'a' or 'b'.]LB[lb:b][ne:a]
(;B[ne];W[mf];B[nd];W[nf];B[od];W[mb];B[pc];W[ke])

(;B[lb];W[mb];B[nb];W[nc];B[ma];W[nd];B[mb];W[jc]
C[Black must crawl along the second line to live, but this is like
trying to lose.])
)

(;W[ke]C['A' or 'B'.]LB[lf:B][ne:A]
(;B[ne];W[lf]C['A' or 'B'.]LB[nd:B][mf:A]
(;B[mf])

(;B[nd];W[nf];B[od];W[lc])
)

(;B[lf];W[mf];B[kd];W[lc];B[kc];W[lb];B[mb];W[kb];B[jb];W[jc];B[jd];
W[lg];B[kf];W[je];B[id];W[jf])
)

(;W[of];B[pg];W[lc])
)
)

(;B[lc];W[kd];B[kc];W[jd];B[md];W[me];B[ic];W[nd])
)

(;W[ph];B[of];W[md]C['A *' or 'B'.]LB[pc:B][lc:A]
(;B[lc];W[nf]C[Black continues with 'a *' or 'b'.]LB[oh:b][ng:a]
(;B[ng]
C[White continues with 'a *' or the very tough 'b'. White 'b' was
introduced by Fujisawa Shuko = Fujisawa Hideyuki in the 1971 Meijin Title against
Rin Kaiho.]
LB[og:b][mf:a]
(;W[mf]
C[White 6 shows the severity of modern Go. When playing like this,
it is desirable to have White stones in the top left corner.]
;B[oh]
C[White could continue with 'a *' or 'b', depending on the side
with support (the right for 'a', the top for 'b').]
LB[ic:b][pj:a]
(;W[pj];B[pc];W[nc]C['A *' or 'B'.]LB[le:B][ic:A]
(;B[ic]C[
* GOOD VARIATION *])

(;B[le];W[me];B[ic])
)

(;W[ic])
)

(;W[og]
C[Black 'a' was played originally in the 1971 Meijin Title: Fujisawa
Shuko vs. Rin Kaiho. Subsequent research revealed Black 'b' is
better.]
LB[pg:b][pe:a]
(;B[pe];W[mf];B[nh];W[pj];B[pc];W[od];B[jd];W[lg])

(;B[pg];W[oh];B[ne];W[mf];B[nd];W[qc];B[od];W[rd];B[pd];W[mh]
C[The sequence ends. Later, Black may play 'a', or possibly 'b'.]
LB[re:b][pc:a]
(;B[pc];W[rb];B[qb];W[rc];B[pb];W[rf];B[rg];W[qh];B[qg];W[qe];B[pe];
W[ra])

(;B[re];W[pc])
)
)
)

(;B[oh]C[White continues with 'a' or 'b'.]LB[pj:b][pe:a]
(;W[pe];B[qe];W[og];B[ng];W[pg];B[qf];W[mf];B[pi];W[nh];B[oi];W[mg];
B[qh];W[ic])

(;W[pj];B[ng];W[mf];B[pc];W[nc];B[ic])
)
)

(;B[pc];W[nc];B[mf];W[kd])
)

(;W[qc]
C[White 'c' is a trick play that should not work. Black continues
with 'a'. Black 'b' is weak.]
LB[rc:b][pd:a]
(;B[pd]C[White may try 'a' or 'b'.]LB[nc:b][pc:a]
(;W[pc];B[od];W[nd];B[nc];W[rd];B[re];W[rc];B[qg]
C[Black gets a superior result.])

(;W[nc]C[White 8 is not good.];B[pc];W[md];B[lc]
C[White has gained nothing.])
)

(;B[rc]C[Black 7 is weak, and lets White succeed.];W[qb];B[pd];W[nc];
B[md];W[ne])
)
)

(;B[qg]
C[Black 5 is slow.

White can playing the forcing move of 'a', then settle his shape,
or stake out the top with 'b' or 'c' at some risk to the White
corner stones.]
LB[jc:c][jd:b][pf:a]
(;W[pf];B[qf];W[qc]
C[Black continues with 'a'. Black 'b' is a trick play.]LB[pd:b][rc:a]
(;B[rc];W[pd];B[qe];W[qb]C[White is settled.];B[jc])

(;B[pd]C[Black 9 is a trick play.]
(;W[od];B[pc];W[pb]
C[Black continues with 'a'. Black 'b' is unreasonable.]LB[qb:b][rc:a]
(;B[rc];W[qb])

(;B[qb]C[Black 13 is unreasonable.];W[rc];B[ob];W[qe]
(;B[rd];W[re])

(;B[re]C[Black 17 is a mistake.];W[rd];B[pa];W[pe];B[pb];W[rf])
)
)

(;W[pc]C[White 10 is a mistake.];B[od];W[nd];B[nc];W[rd];B[qe];W[ne];
B[kd])
)
)

(;W[jd]AW[cc]C[White plays a high extension/pincer from the corner.];
B[me];W[og])

(;W[jc]AW[dd]C[White plays a low extension/pincer.];B[pc]
C[White continues with 'a' or 'b'.]LB[pd:b][ob:a]
(;W[ob]C[White 8 keeps the Black stones separated.];B[me];W[og];B[je];
W[hc])

(;W[pb];B[qb];W[pd];B[qc]
C[White continues with 'a'. White 'b' is not recommended.]
LB[ld:b][og:a]
(;W[og];B[le];W[lg];B[je];W[hc])

(;W[ld];B[ob];W[nb];B[pa];W[nc]C[White is overconcentrated.])
)
)
)

(;B[pc]
C[Black 5 is a trick play.

White replies with 'a'. White 'b' is not good.]
LB[ob:b][pb:a]
(;W[pb]C[Black may try 'a' or 'b'.]LB[od:b][qb:a]
(;B[qb];W[pd];B[qc];W[qe];B[re];W[qf];B[rf];W[qg])

(;B[od];W[nd];B[pd];W[nc];B[ne];W[md];B[nf];W[qb])
)

(;W[ob]C[White 6 is not recommended.];B[pf]
C[Black plays 7 and Black 5 is left as an effective forcing move.])
)

(;B[pg]
C[Black 4 is an overplay; too thin.

White continues with 'a'. White 'b' is unreasonable.]
LB[qe:b][nc:a]
(;W[nc]
C[White 6 looks slow, but it is the move.

Black may try 'a' or 'b'.]
LB[md:b][pe:a]
(;B[pe];W[md]C[White 8 makes good shape at top.])

(;B[md];W[qe];B[pe];W[pd];B[pf];W[qc];B[rd];W[re];B[rc];W[rb]
C[White 16 is the tesuji.];B[qb];W[pc];B[ra];W[sb])
)

(;W[qe]C[White 6 is not recommended.];B[pd];W[pe];B[od];W[nd];B[nc];
W[rd];B[pb]
C[Black 13 is the tesuji to save the Black stones.

This result favors Black.])
)
)

(;W[md];B[ld]C[White continues with 'a *' or 'b *'.]LB[me:b][nd:a]
(;W[nd]
C[Black continues with 'a *' or 'b *', though Black should only
play 'b' with a favorable ladder off 'a'.]
LB[kc:b][qg:a]
(;B[qg];W[lc];B[kc];W[lb]
C[Black connects at 'a *'. Black 'b' leaves a cutting point (at
'a'), which Black must take care of in gote.]
LB[kb:b][kd:a];B[kd]
C[White continues with 'a *'. White 'b' is disadvantageous.]
LB[kb:b][mb:a]
(;W[mb]C[
* GOOD VARIATION *])

(;W[kb]C[White 12 is a mistake, even with a favorable ladder.];B[jb];
W[jc];B[ib]C[Black 15 assuming the ladder does not work.];W[mb];B[id]
C[Even though Black has ended in gote, Black is solid. White should
not play this way.])
)

(;B[kc]
C[White continues with 'a *', 'b *' to 'd'. White must have the
ladder to play 'a'.

White 'e' is not recommended.]
LB[qg:e][qe:d][qf:c][pg:b][pf:a]
(;W[pf]
C[White must have the ladder to play this way.

Black continues with 'a *'. Black 'b' is not recommended.]
LB[pe:b][qf:a]
(;B[qf];W[qg];B[pg];W[qe];B[rf];W[of]
C[Black 'a *' is joseki. Black 'b' invites a loss in the corner.]
LB[qh:b][re:a]
(;B[re];W[ph];B[qb];W[og]C[
* GOOD VARIATION *])

(;B[qh]C[Black 15 gives the corner away.];W[re];B[rg];W[pd])
)

(;B[pe]
C[Black 9 is not recommended.

White continues with 'a'. White 'b' is a mistake, as Black gets
territory while White builds thickness for nothing.]
LB[oe:b][of:a]
(;W[of]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[oe:b][qf:a]
(;B[qf];W[qg];B[rf];W[ph];B[qb]
C[Black 15 is necessary to live in the corner.];W[lf])

(;B[oe]C[Black 11 is a forcing play that is not recommended.];W[nf];
B[ne];W[me];B[mf];W[le]C[White 16 gets White out of trouble. 

Black];
B[qf];W[ph];B[qg];W[oi])
)

(;W[oe]C[White 8 is a mistake.];B[qf];W[pg];B[qg];W[ph];B[ri]
C[White's wall is not very useful.])
)
)

(;W[pg]C[Black continues with 'a *' or 'b *'.]LB[pe:b][pc:a]
(;B[pc];W[pb];B[qb];W[pd];B[qc];W[pe];B[rf];W[qh]
C[
* GOOD VARIATION *])

(;B[pe];W[nf];B[pc];W[ob];B[pb];W[lf]C[
* GOOD VARIATION *])
)

(;W[qf];B[pf]C[White continues with 'a'. White 'b' is unreasonable.]
LB[qe:b][pg:a]
(;W[pg];B[pe]C[White continues with 'a' (gote), or 'b' to have sente.]
LB[mf:b][og:a]
(;W[og];B[qg];W[qh];B[rg];W[rh];B[rf];W[mf])

(;W[mf];B[qg];W[qh];B[rg];W[ph];B[rf])
)

(;W[qe]C[White 10 is unreasonable.];B[pe];W[pd];B[qc]
C[It would be hard to kill the two Black stones in the corner.
If White attempts it, Black will sacrifice them to gain outside
thickness. In any event, Black has an easy fight.])
)

(;W[qe]C[Black continues with 'a'. Black 'b' is vulgar.]LB[pd:b][re:a]
(;B[re];W[pd];B[qf];W[pe];B[qc]
C[White cuts at 'a' if the ladder to capture 11 is favorable, 'b'
if the ladder is unfavorable.]
LB[rf:b][rd:a]
(;W[rd]
C[White plays 14 when the ladder to capture Black 11 is favorable.];
B[rc];W[rf];B[sd];W[qg])

(;W[rf]C[White plays 14 when the ladder is unfavorable.];B[rg];W[rd];
B[sf];W[rc]C[White captures the two Black stones in the corner.])
)

(;B[pd]C[Black 9 is a mistake.];W[pe]C[Black 'a' is better than 'b'.]
LB[re:b][od:a]
(;B[od];W[oe];B[nc];W[rd]
C[Black 'a' is best, Black 'b' and 'c' inferior.]LB[ob:c][pc:b][pb:a]
(;B[pb];W[qc];B[pc];W[qb];B[ob];W[qj])

(;B[pc];W[pb])

(;B[ob];W[qc])
)

(;B[re];W[rf];B[oe];W[od];B[rd];W[pg])
)
)

(;W[qg]C[White 8 is not recommended, as White is split.];B[pf];W[pg];
B[of];W[qf];B[qe];W[mf];B[og])
)
)

(;W[me]
C[Attaching and extending is more positive than attaching and drawing
back.]
;B[nc]
C[White continues with 'a' or 'b'. White should have the ladder
to play 'b'.]
LB[pe:b][od:a]
(;W[od]
C[White builds influence and aims at attacking Black on both sides.

Black continues with 'a* ', 'b *', 'c' or 'e'. Black 'd' is not
recommended, as the corner stone suffers attack.

Black 'c' is direct and forceful. Black sacrifices the corner.
Black must be confident in the fight that follows.]
LB[qg:e][ic:d][nd:c][qf:b][pf:a]
(;B[pf];W[of];B[pg]C['A *' or 'B'.]LB[qc:B][jd:A]
(;W[jd];B[le];W[lf];B[ke]C['A' aims for safety, 'B' for a fight.]
LB[kb:B][qc:A]
(;W[qc];B[rc];W[rd]C['A *' is joseki, 'B' is possible.]LB[re:B][qb:A]
(;B[qb]C[White continues with 'a *'. White 'b' is a mistake.]
LB[pc:b][ob:a]
(;W[ob];B[pc];W[lc];B[kc];W[lb];B[jc];W[mb];B[id]
C[
* GOOD VARIATION *])

(;W[pc]C[White 20 is a mistake.];B[re];W[rb];B[sd]
C[White cannot make two eyes, as the following sequence shows.];W[sb]
C[White cannot make two eyes.];B[ra];W[pb];B[qa])
)

(;B[re];W[qe];B[sd];W[pd];B[rd];W[pe];B[qf])
)

(;W[kb];B[lc];W[hd])
)

(;W[qc];B[rc];W[rd];B[re];W[qe];B[sd];W[pd];B[rd];W[pe];B[rf];W[jd];
B[le];W[lf];B[ke])
)

(;B[qf];W[pe];B[ic]C[White continues with 'a *' to 'c'.]
LB[qh:c][pg:b][qe:a]
(;W[qe];B[re];W[rd]C[Black continues with 'a *' or 'b *'.]
LB[rf:b][rc:a]
(;B[rc];W[rf];B[sd];W[qg];B[qb];W[pf]C[
* GOOD VARIATION *])

(;B[rf];W[qc];B[qj]C[
* GOOD VARIATION *])
)

(;W[pg];B[qh];W[qe];B[re];W[rd];B[rf];W[qc])

(;W[qh];B[qe];W[oh];B[qb])
)

(;B[nd]C[Black 9 is a fighting move.];W[ne];B[oe];W[pe];B[of];W[pd];
B[kc];W[mg];B[oh];W[qe];B[kf];W[ng];B[og];W[mi];B[oj])

(;B[ic]
C[Black 9 is not recommended. The corner stone comes under attack.];
W[qe];B[re];W[qf];B[rf];W[qg];B[qc];W[kf])

(;B[qg];W[pe]C['A' is correct, 'B' is bad.]LB[ic:B][qe:A]
(;B[qe];W[jd];B[le];W[lf];B[ke];W[mg])

(;B[ic];W[qe];B[re];W[rf];B[rd];W[qf];B[qb];W[pb];B[rb];W[pj])
)
)

(;W[pe]
C[White 8 is somewhat a trick play. This move was researched and
used in games around 1910.

Black continues with the simple 'a', or 'b' to risk a fight.]
LB[qe:b][ob:a]
(;B[ob];W[pc];B[pb];W[qc])

(;B[qe];W[pf]
C[Black continues with 'a'. Black must not jump to 'b', as he cannot
afford the cut.

White must have the ladder to succeed.]
LB[qg:b][qf:a]
(;B[qf]C[White can play at 'a', but 'b' is preferable.]LB[nd:b][pg:a]
(;W[pg];B[qh])

(;W[nd]
C[Black 'a' leads to fighting. Black 'b' sacrifices the two Black
stones (3 & 7) for the right.]
LB[pd:b][kc:a]
(;B[kc];W[qh]C[Black continues with 'a' or 'b'.]LB[qg:b][qc:a]
(;B[qc];W[pb];B[qg]C[The push and cut by Black are unwise.];W[pg];
B[ph];W[qi];B[oh];W[le])

(;B[qg];W[pg]C[Black continues with 'a'. Black 'b' is cowardly.]
LB[rh:b][qi:a]
(;B[qi];W[rh];B[ph]
C[Black has 'a' and 'b' available, so the fight should be favorable
if missteps are avoided.]
LB[oh:b][pd:a])

(;B[rh]C[Black crawls along "the line of defeat".];W[qi];B[ri];W[qj])
)
)

(;B[pd];W[od];B[pg];W[lc];B[pb];W[ob])
)
)

(;B[qg]C[Black 11 is a mistake.];W[ob]
C[Neither Black 'a' nor 'b' work if White has the ladder.

White captures Black 3,7 if Black 'b'.]
LB[qb:b][kc:a]
(;B[kc];W[qf]C[White must have the ladder to play this way.];B[rf];
W[re]C[Black 'a' is a mistake. White needs a ladder if Black 'b'.]
LB[rd:b][rg:a]
(;B[rg];W[rd];B[qc];W[rc];B[rb];W[qb];B[pb];W[qa];B[ra];W[pc];B[pa];
W[qb];B[qa];W[pd])

(;B[rd];W[rg];B[se];W[qh])
)

(;B[qb];W[lc];B[kc];W[lb];B[kb];W[mb])
)
)
)
)
)

(;W[qc]
C[The aim of White's 3-3 contact play is to settle the situation
quickly.
'A *' is joseki, 'B' another variation.]
LB[pd:B][rc:A]
(;B[rc]
C[White continues with 'a *'. White 'b' gives Black excellent thickness.]
LB[rb:b][pd:a]
(;W[pd]C[Black continues with 'a *' or 'b *'.]LB[qb:b][qe:a]
(;B[qe];W[qb]C['A *' is joseki, 'B' is a mistake.]LB[qh:B][pg:A]
(;B[pg]
C[White continues with 'a'. Playing elsewhere ('b') is not recommended,
as White is threatened and Black strengthened in sente.]
LB[dp:b][rb:a]
(;W[rb]C[
* GOOD VARIATION *];B[qk])

(;W[tt]C[White 10, playing elsewhere, is a mistake.];B[rb];W[md];B[ld]
;W[nd];B[kc];W[pe];B[pf];W[nf])
)

(;B[qh];W[pe];B[pf];W[of];B[pg]C[The marked stone is weakened now.]
TR[mc])
)

(;B[qb];W[qe];B[pc]
C[White continues with 'a *'. White 'b' is a mistake.]LB[pb:b][rd:a]
(;W[rd]C[Black continues with 'a *'. Black 'b' is unreasonable.]
LB[od:b][qc:a]
(;B[qc]C['A *' is correct, 'B' is inferior.]LB[oe:B][pe:A]
(;W[pe];B[ob];W[qi]C[
* GOOD VARIATION *])

(;W[oe];B[nd];W[od];B[ob];W[qi]C[Black aji on A.]LB[pf:A])
)

(;B[od]C[Black cuts, but cannot fight the ko. Black 11 is a mistake.];
W[qc];B[pb];W[pe]C[Black continues with 'a' or 'b'.]LB[nd:b][oe:a]
(;B[oe];W[of];B[me];W[qi])

(;B[nd];W[qi])
)
)

(;W[pb]C[White 10 is a mistake. Black punishes with 'A' or 'B'.]
LB[pe:B][qc:A]
(;B[qc]C['A', 'B' or 'C' don't help.]LB[pe:C][od:B][oe:A]
(;W[oe]PL[2];B[pf];W[pe];B[nd];W[od];B[ph])

(;W[od];B[qf];W[pe];B[re])

(;W[pe];B[nc])
)

(;B[pe];W[qc];B[rd]
C[White 'a' is the best move available. White 'b' is not as good,
and White 'c' bad.]
LB[oe:c][od:b][md:a]
(;W[md];B[oe];W[lc];B[od];W[nc];B[pc])

(;W[od];B[qf])

(;W[oe]C[No good will come for White from White 14.];B[pf];W[qf];B[pc]
;W[od];B[qg];W[pg];B[of])
)
)
)
)

(;W[rb]C[White 6 is a mistake. Black gets wonderful thickness.];B[pc];
W[qb];B[pd];W[pb];B[od];W[nc];B[nd])
)

(;B[pd];W[pc];B[od];W[nd];B[nc];W[rd];B[re];W[rc];B[pf];W[ne];B[kd])
)

(;W[tt]
C[White plays elsewhere. To do so without a favorable ladder is
to invite a loss.

Black continues with 'a *' or 'b'.]
LB[pc:b][od:a]
(;B[od]
C[White plays 'a *' if the ladder is favorable. If the ladder is
not favorable, White must play 'b', proving that White should
not play elsewhere if the ladder is unfavorable.

'c' show Black's follow-up if White again plays elsewhere.]
LB[cq:c][pc:b][pd:a]
(;W[pd]
C[Black usually plays 'a *'. Black can play 'b' in which case a ladder is helpful but not required.
]
LB[pc:b][pe:a]
(;B[pe];W[pc];B[nd];W[qc]C['A' or 'B'.]LB[re:B][qe:A]
(;B[qe])

(;B[re]C[White continues with 'a*'. White 'b' is sente, but risky.]
LB[rd:b][rc:a]
(;W[rc]
C[
* GOOD VARIATION *

White plays 12 to ensure life in the corner.])

(;W[rd]C[White 12 is not recommended.];B[qe];W[cq]
C[White plays elsewhere.];B[rc];W[rb];B[sd];W[sb];B[pa]
C[Black 19 is a tesuji.];W[nb];B[mb];W[oa]
C[Black can now play 'a' and 'b' in sente. The value of the cutting
point at 'c' has disappeared.]
LB[oe:c][ma:b][nc:a])
)
)

(;B[pc];W[pe]LB[qc:A][oe:B]C['A' if the ladder works, 'B' if not.
]
(;B[qc];W[nd];B[ob];W[oe])

(;B[oe];W[qc];B[pb];W[of];B[nf]LB[qe:A][pf:B]
C['A' is possible, but gives Black sente. If White has a position in the upper left corner, White might prefer taking sente with 'B'.
]
(;W[qe];B[rd];W[pf];B[rc];W[ng];B[mf];W[mg];B[lf];W[oh]LB[qk:A]
C[If White has a position on the right side the result might be nice, but if not, a Black approach on or near 'A' puts White in an inferior position.
]
;B[qk])

(;AW[ec][cd];W[pf];B[rc];W[ng];B[mf];W[mg];B[lf];W[lg];B[kf];W[kg];
B[jf]
C[Pushing Black to sixth-line-territory is ok, if its already reduced by the White stones in the upper left.
]
;W[qn]C[Somewhere here, White plays a very far extension.
])
)
)
)

(;W[pc];B[pd]
C[White continues wtih 'a'. White 'b' only makes the loss greater.]
LB[nc:b][qc:a]
(;W[qc];B[nc];W[rd];B[re];W[rc];B[qf])

(;W[nc]C[White 8 is a mistake.];B[nd];W[mb];B[lc];W[lb];B[kc];W[qc])
)

(;W[tt]C[White plays elsewhere again.];B[nc]
C[White 'a' is answered by Black 'b'.]LB[qc:b][pc:a])
)

(;B[pc];W[od];B[pf];W[ne];B[ph];W[ld];B[jc]
C[Black trying to put Black 3 into play is greedy. Black 11 or
'a' is recommended.]
LB[ic:a];W[lc])
)

(;W[ne]
C[White 4 appeared in the late 1920's, but the move is odd, hardly
joseki. Black continues 'a' or 'b'.]
LB[od:b][pf:a]
(;B[pf]C[White continues with 'a' or 'b'.]LB[qc:b][ld:a]
(;W[ld];B[pc];W[od];B[ph])

(;W[qc]C[Black continues with 'a'. Black 'b' is weak.]LB[rc:b][pd:a]
(;B[pd];W[pc];B[od]
C[If White 'a' and Black 'b', White has to go back and make the
corner alive. Consequently, White will leave things as they are
and play 'c' to erase Black's thickness, but it is enough for
Black to push through at 'a'.]
LB[pj:c][nc:b][nd:a])

(;B[rc]C[Black 'b' is submissive.];W[pd];B[qe];W[ld])
)
)

(;B[od];W[nd];B[nc];W[pd];B[oe];W[pe];B[of];W[pc];B[pf];W[qe];B[qf]
C[If Black plays 'a' instead of 15, White turns at 15, increasing
his territory, and this result is not necessarily favorable for
Black. If White 'b' in answer to Black 11, then Black 'a' is
alright.]
LB[re:b][mf:a];W[lf];B[re];W[rd];B[rf];W[rc];B[kd];W[nf];B[qj]
C[Black 21 and 23 apply pressure on both sides to White's floating
stones. With 23 Black gets territory equal to White's corner
and can torment White's center stones for more profit.])
)

(;W[pd]
C[White 4 is not joseki.
'a' is correct, 'b' fails to punish the mistake.]
LB[qe:b][qc:a]
(;B[qc];W[qe];B[pe]
C[The cut punishes because White can't kill the corner.
White may try 'a' or 'b'. Neither work.]
LB[oe:b][re:a]
(;W[re];B[ob]
C[After Black 9, there is nothing White can do to cause a favorable
result.]
;W[nb];B[pb];W[nc];B[rd];W[rb];B[qb];W[ra];B[oa];W[sc];B[sd]
C[White's corner stones die. Neither 'a' nor 'b' works for White.]
LB[rc:b][qa:a]
(;W[qa];B[sb])

(;W[rc];B[qa])
)

(;W[oe];B[pf];W[qf];B[qg];W[rg];B[pg];W[rd];B[rc];W[re];B[pc];W[od];
B[ob];W[nb];B[pb];W[nc];B[rh];W[sd];B[sg];W[sc];B[rb];W[sb];B[qa];
W[oa];B[rf])
)

(;B[qe];W[qc];B[rc];W[qb];B[pg];W[rb]
C[Black failed to use 3 to put White in trouble.]LB[mc:3])
)
)

(;B[lc]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

The low two-space pincer used to be the most popular. With modern
Go emphasis on influence, the two-space high pincer has replaced
it.

Possible White reponses range from 'a', 'b *', 'c *', 'd *',
'e *' to 'g *', or elsewhere 'h *'. White must have the ladder
to play 'd' or play elsewhere (h8).

Note, in contrast to the one-space pincer, the one-space jump
(shown at 'i') is not joseki.

'j' and 'k' are mistakes.

k11, j10, i9, h8, g7, f6, e5, d4, c3, b2, a1

outcomes:
a1 - White pincer at top; White gets out
b2, c3 - different outcomes
d4 - White takes the right
e5 - White gets out, takes part of the corner
f6 - White takes the right
g7 - initial loss, generally White takes the right
]
LB[pd:k][qb:j][oe:i][dp:h][ld:g][me:f][nd:e][qg:d][qc:c][pe:b][of:a]
(;W[of]C['A' or 'B' are ok.]LB[oe:B][qg:A]
(;B[qg]LB[jc:B][ic:A]
(;W[ic];B[me]
C[Black 7 is a vital point.

White continues with 'a' or 'b'. Many continuations are the same
as with the two-space high pincer; consult those variations.]
LB[pd:b][qc:a])

(;W[jc]C['A' or 'B'.]LB[me:B][le:A]
(;B[le]C['A' is joseki, 'B' is a mistake.]LB[qc:B][pd:A]
(;W[pd]C['A' or 'B'.]LB[qe:B][qc:A]
(;B[qc];W[qe];B[re];W[rf];B[qf];W[pe];B[rd];W[oh])

(;B[qe];W[qc];B[rc];W[qb])
)

(;W[qc];B[rc];W[pd];B[qb];W[qe];B[pc];W[rd];B[qc];W[oe];B[ob]
C[The exchange of the triangled stones is now bad for Black.]
TR[le][jc])
)

(;B[me])
)
)

(;B[oe];W[ne];B[pe];W[mc]C['A' is correct, 'B' and 'C' are mistakes.]
LB[mb:C][ld:B][nf:A]
(;B[nf];W[me];B[og];W[ld])

(;B[ld];W[nf];B[nd];W[md];B[od];W[le])

(;B[mb];W[ld];B[nf];W[me];B[og];W[kc];B[lb];W[kb];B[nc];W[nb];B[md];
W[nd];B[mc];W[ma])
)
)

(;W[pe]
C[The White pressing move was popular in Edo period (1600-1867)
games. White aims to build influence then attack with a pincer
of his own. The idea is the same as the two-space jump, but more
forceful.

Black continues with 'a *' or 'b *'. 'b' leads to a difficult
joseki.]
LB[pd:b][qe:a]
(;B[qe];W[pf];B[qg];W[jc];B[le]
C[
* GOOD VARIATION *

White continues with 'a' or 'b'.]LB[je:b][pg:a]
(;W[pg];B[qh];W[ph];B[pi];W[oi]C[Black continues with 'a' or 'b'.]
LB[oj:b][pj:a]
(;B[pj];W[qf];B[rf];W[rg]C[Black continues with 'a' or 'b'.]
LB[rh:b][re:a]
(;B[re];W[je];B[lg];W[nh])

(;B[rh];W[re];B[sg];W[qc];B[rd];W[je])
)

(;B[oj];W[qf];B[rf];W[re];B[rg];W[qc]
C[Black continues with 'a' or 'b'.]LB[ni:b][rd:a]
(;B[rd];W[pj];B[qi];W[ni];B[je])

(;B[ni];W[rd];B[oh])
)
)

(;W[je]
C[Black continues with 'a' (joseki). Black 'b' allows White good
shape.]
LB[lg:b][ne:a]
(;B[ne]
C[White continues with 'a'. White gets sealed in if he plays 'b'.]
LB[pd:b][qf:a]
(;W[qf];B[rf];W[pg]C[Black continues with 'a' or 'b'.]LB[qh:b][pd:a]
(;B[pd];W[od];B[oe];W[rg];B[re];W[qh])

(;B[qh];W[pd];B[qc]C[Black 17 is a strategic point.];W[md])
)

(;W[pd]C[White 12 is a mistake.];B[pg];W[qf];B[rf];W[qc];B[og];W[rc])
)

(;B[lg]C[Black 11 is slack.];W[nf])
)
)

(;B[pd];W[od];B[oe]
C[Neither side can afford a mistake. White continues with 'a *'.
White 'b' is a mistake.]
LB[qe:b][pf:a]
(;W[pf]
C[White 8 is the only move.

Black continues with 'a *', not 'b'. 'c' is inferior.]
LB[nd:c][ne:b][of:a]
(;B[of]C[Black 9 is the only move.];W[pg];B[og]
C[White continues with 'a *'. White 'b' is a mistake.]LB[ph:b][re:a]
(;W[re]C[Black continues with 'a' or 'b *'.]LB[pc:b][rd:a]
(;B[rd]C[White continues at 'a'. White 'b' is slack.]LB[qb:b][pc:a]
(;W[pc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qb:b][qc:a]
(;B[qc];W[qb];B[rb];W[pa];B[rf];W[qe];B[se];W[ph];B[nd];W[sc];B[sd];
W[ra];B[sb];W[nc];B[mc];W[rg];B[nb];W[ob];B[na];W[oa];B[lb];W[ne];
B[md];W[qf];B[mf];W[sf];B[rc]
C[The result in the corner is a seki. The result overall is considered
slightly favorable to White.])

(;B[qb]C[Black 15 is a mistake.];W[qc];B[rc];W[rb];B[sb];W[ra];B[qa];
W[sd]C[White wins by throwing in at White 18 after Black captures.])
)

(;W[qb]
C[White 14 is a mistake. Black discards the corner for superior
thickness.]
;B[ph];W[rf];B[rb];W[qc];B[rc];W[ra];B[md]
C[White must play 'a', not another move (such as 'b').]LB[qh:b][pc:a]
(;W[pc];B[oi])

(;W[qh]C[White 22 is a mistake.];B[pc];W[pb];B[ob];W[nb];B[oa];W[na];
B[nc];W[pa];B[ob];W[oa];B[nd];W[ob];B[mb])
)
)

(;B[pc];W[md];B[ph];W[qh];B[qi];W[rd];B[ob];W[mc];B[qb];W[rh];B[ri];
W[rg];B[rc];W[nb];B[oa]
C['A *' is necessary, just playing 'B' without it is failure.]
LB[mf:B][sb:A]
(;W[sb]
C[A tesuji by White, ensuring life for the group on the right side.
Joseki continues with Black 'a *'. Black 'b' doesn't work as
a life threat against the White group.]
LB[sc:b][oh:a]
(;B[oh]C[Black does not need to answer, so reinforces at Black 29.]
PL[2];W[jc]C[
* GOOD VARIATION *])

(;B[sc];W[mf];B[oh];W[jc];B[sh];W[qe];B[sd];W[se];B[rb];W[sg])
)

(;W[mf];B[oh];W[jc];B[qf];W[qe];B[sd];W[se];B[sh];W[sb];B[rb])
)
)

(;W[ph]C[White 12 is a mistake.];B[nd];W[nc];B[mc];W[qb];B[rb];W[ne];
B[md];W[oh];B[mf];W[ra]C[White sets up a ko he cannot win.];B[pb];
W[pc];B[qc];W[pa];B[qa];W[ng];B[nf];W[qb];B[ob];W[nb];B[qa])
)

(;B[ne]C[Black 9 is a mistake.];W[pb];B[rf];W[md]
C[If Black 'a', White gives way with 'b'. Black has a difficult
fight ahead.]
LB[mc:b][nd:a])

(;B[nd]
C[Black 9 is a recent variation, whose outcome is not as favorable 
to Black as the joseki of Black 9 onto the marked point, as White 
gets better thickness to the right.

Black requires a favorable ladder to the lower left to play Black
9.

The sequence that follows is complex. A miscalculation on either
side could have disasterous consequences.]
LB[nd:9]MA[of];W[nc];B[md];W[qb];B[rb];W[pb];B[rf];W[rg];B[re];W[ne];
B[of];W[pg];B[rc];W[mc];B[ld];W[ng]
C[White 24 would be played only if White did not have a favorable
ladder to capture the two Black stones.]
;B[nf];W[mf];B[me];W[og];B[ne];W[lb];B[kb];W[la];B[jc];W[ra];B[sd];
W[nb])
)

(;W[qe]C[White 8 is unreasonable.];B[re]
C[White may try 'a' or 'b'. Neither work.]LB[rd:b][rf:a]
(;W[rf];B[rd])

(;W[rd]
C[White 10 was played by Kitani Minoru (White) against Mukai Kazuo
(Black) in April 1924.]
;B[rc];W[qc];B[sd];W[pc];B[rd];W[pg];B[ne];W[qg];B[rb];W[md];B[me];
W[ld];B[nd];W[mc];B[nc];W[nb];B[ob]
C[White continues with 'a'. White 'b' is less favorable.]
LB[pb:b][lb:a]
(;W[lb];B[na];W[mb];B[pb])

(;W[pb];B[mb];W[oa]
C[Black continues with 'a' if the ladder is favorable, 'b' if not.]
LB[kb:b][kd:a]
(;B[kd]C[Black must have the ladder to play this way.])

(;B[kb];W[le];B[mg];W[qa];B[jc]C[Black lets White live in the corner.]
;W[qb];B[rg]
C[Black 37 to ensure life.

White has two floating groups to look after in the fighting ahead.])
)
)
)
)
)

(;W[qc];B[rc];W[pd]C[Black continues with 'a *' or 'b'.]LB[qb:b][qe:a]
(;B[qe];W[qb];B[pg]
C[
* GOOD VARIATION *

White continues with 'a' or 'b'. If Black 'a', White 'd' to make
shape.

Playing elsewhere ('d'), gives Black an opportunity.]
LB[nd:d][dp:c][qk:b][rb:a]
(;W[rb])

(;W[qk];B[rb];W[nd])

(;W[tt]C[White plays elsewhere. 'a' and 'b' are miai.]LB[rb:b][nd:a]
(;B[nd]C[Black emphasizes the center.];W[pe];B[pf];W[rb]
C[If White 'a', Black 'b'.]LB[mf:b][oe:a])

(;B[rb];W[nd])
)
)

(;B[qb]
C[Black 7 is possible, although Black drawing back at  a  is
more common with the low two-space pincer.

White continues with 'a' or 'b'.]
LB[pe:b][qe:a]
(;W[qe];B[pc];W[rd]
C[Joseki continues with Black 'a'. Black 'b' is less favorable.]
LB[od:b][qc:a]
(;B[qc];W[oe]
C[Black will leave the corner. Playing Black 'a', White 'b', Black
'c' is too low ("the second line is the line of defeat").]
LB[nb:c][nc:b][ob:a])

(;B[od];W[qc];B[pb];W[pe];B[nc];W[oe];B[nd];W[qi]
C[White also has the cut at 'a' to look forward to.]LB[rb:a])
)

(;W[pe]C[White must have the ladder to play this way.];B[pc];W[pb];
B[qc];W[qf];B[ic];W[nd])
)
)

(;W[qg]
C[White must have the ladder to play this way. Black continues
with 'a *' or 'b'.]
LB[od:b][pe:a]
(;B[pe];W[qj]C[Black continues with 'a *' or 'b'.]LB[pc:b][nd:a]
(;B[nd]
C[
* GOOD VARIATION *

Although the White stone is sealed in, it is not yet dead because
White can play 'a'. The ensuing sequence will make Black thick,
however, so timing is important. 

Variation 2 ('b') show White playing elsewhere.]
LB[dp:b][qb:a]
(;W[qb]C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
LB[rc:c][rb:b][nc:a]
(;B[nc]C[White continues with 'a' or 'b'.]LB[ob:b][rc:a]
(;W[rc];B[ob];W[re])

(;W[ob];B[rc];W[rb];B[sb];W[od];B[oe];W[nb];B[mb];W[qc];B[re];W[pa])
)

(;B[rb];W[rc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qc:b][pb:a]
(;B[pb];W[ra];B[sb];W[sc];B[pc];W[re])

(;B[qc]C[Black 11 is a mistake.];W[ra];B[sb];W[sc];B[pb];W[sa];B[pc];
W[rf])
)

(;B[rc]C[Black 9 is a mistake. Black cannot capture White.];W[mb];
B[lb];W[od];B[oe];W[rb];B[sb];W[qc];B[re];W[nc];B[mc];W[ma])
)

(;W[tt]C[White plays elsewhere.];B[rd]
C[Black 8 is quite big. 'a' instead of 1 is solid but Black becomes
over concentrated. Black 1 at 'b' has been seen.]
LB[re:b][pc:a])
)

(;B[pc]C[Black 7 is territory oriented.];W[pb];B[qb];W[of]
C[White 10 works on a moyo. White 8 was a throw away, leaving 'a'
as a peep.]
LB[rc:a];B[nd])
)

(;B[od]C[White 'a' is joseki. White 'b' is disadvantageous.]
LB[qj:b][pd:a]
(;W[pd]
C[White must have the ladder. If so, Black plays 'a'. If White
does not have the ladder, Black plays 'b'.]
LB[pc:b][pe:a]
(;B[pe];W[pc]
C[Black 'a' is tesuji (and joseki). Black 'b' and 'c' result in
a loss.]
LB[qc:c][oe:b][re:a]
(;B[re]C[White continues with 'a' or 'b'.]LB[nd:b][mc:a]
(;W[mc]C[Black continues with 'a' or 'b'.]LB[nd:b][ld:a]
(;B[ld]C[White 'b' is joseki. White 'b' leads to difficulty.]
LB[oe:b][me:a]
(;W[me]
C[Black continues with 'a' to establish a base. Black 'b' is heavy.]
LB[oe:b][qc:a]
(;B[qc];W[oe];B[of];W[nd];B[pf])

(;B[oe]C[Black 13 is heavy.];W[md])
)

(;W[oe];B[nd];W[md];B[ne];W[me];B[of]
C[White continues with 'a' or 'b'.]LB[jd:b][mf:a]
(;W[mf];B[id])

(;W[jd];B[mf]C[Black discards the two stones.])
)
)

(;B[nd]C[Black plays 11 if the ladder favors him.];W[md];B[nc];W[nb];
B[ob];W[lb];B[pb];W[mf])
)

(;W[nd]C[White 10 is a fighting move.];B[oe];W[ne];B[nf];W[ld];B[kd];
W[le];B[mc];W[nc];B[qb];W[id])
)

(;B[oe]C[Black 9 is a mistake.];W[qe];B[qf];W[re];B[rf];W[rd];B[pg])

(;B[qc]C[Black 9 is a mistake.];W[qe])
)

(;B[pc]
C[Black plays 7 if the ladder is not favorable to White. White
is in serious trouble if White does not have the ladder.]
;W[pe];B[qc]
C[White plays 'a' if the ladder is favorable, in which case Black
has made a mistake.]
LB[nd:a];W[nd];B[ob]
C[Black must play 11 if the ladder works for White, though the
result favors white.]
;W[nc];B[nb])
)

(;W[qj]C[White 6 is not recommended.];B[pc]
C[Black has a better result locally.])
)
)

(;W[nd]
C[Black continues with 'a *' or 'b'. Black 'c' is not recommended,
as White squeezes the corner stone. Black 'd' is not recommended,
as White easily settles.]
LB[le:c][pc:b][pf:a]
(;B[pf]C['A *' is ok, 'B' is questionable.]LB[qc:B][qb:A]
(;W[qb];B[qj]C[
* GOOD VARIATION *];W[dp]
C[White plays elsewhere.

Black may continue at 'a' to press White and build a moyo. The
drawback is the at stones on the right becomes weakened.]
LB[me:a];B[me];W[ne];B[mf];W[nf];B[mg])

(;W[qc]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.]
;B[rc];W[pd];B[qe];W[qb])
)

(;B[pc];W[pb];B[qb];W[pd];B[qc];W[pe];B[qf])

(;B[le]
C[Black 5 is not recommended.

White continues with 'a'. White 'b' is a mistake. White 'c' is
an overplay.]
LB[qf:c][pe:b][pf:a]
(;W[pf];B[pc];W[pb];B[qb];W[pd];B[qc];W[qe])

(;W[pe]C[White 6 lets Black live on the right side.];B[qe];W[pf];B[qg])

(;W[qf]C[White 6 is an overplay.];B[pe]
C[White loses control of the situation.])
)

(;B[oe]
C[White easily settles into the corner with 'a'. White 'b' is a
bad move.]
LB[ne:b][qb:a]
(;W[qb]C[Black continues with 'a'. Black 'b' is unreasonable.]
LB[me:b][pj:a]
(;B[pj]
C[This is not a favorable result for Black. Black is loose on the
right, and with the White group secure, the pincer of Black 3
is subject to attack.])

(;B[me]C[Black 7 is unreasonable.];W[ne];B[nf];W[md];B[ld];W[of])
)

(;W[ne]
C[White 6 is a mistake, as Black gets good shape on both sides.];B[of]
;W[le];B[jd])
)
)

(;W[me]
C[The gap at 'c' is intentional. Black playing there (variation
'c') is just what White wants.

Black continues with 'a' or 'b'.

Black 'c' and 'd' are not recommended.

d4, c3, b2, a1]
LB[pe:d][nd:c][le:b][od:a]
(;B[od]C[White 'a' is joseki. White 'b' gives bad shape.]
LB[nd:b][mc:a]
(;W[mc]
C[Joseki continues with Black 'a'. Black 'b' is a potential mistake.]
LB[ld:b][pc:a]
(;B[pc];W[ld]
C[As for continuation, Black 'a' is recommended. Black cannot easily
move out with 'b'.]
LB[kc:b][nc:a]
(;B[nc])

(;B[kc]C[Black 9 is not recommended.];W[id])
)

(;B[ld]C[White continues with 'a' . White 'b' is a mistake.]
LB[md:b][pd:a]
(;W[pd];B[pe];W[pc];B[oe];W[md];B[qc];W[jd];B[ke];W[mg])

(;W[md]C[White 8 is a mistake.];B[pc];W[jd];B[ke]
C[White's stones are weak all over.])
)
)

(;W[nd]C[White 6 is a mistake.];B[oe];W[pc];B[qc]
C[White 4 should be at the red dot.

Black now has an effective move at 'a', aiming at the cut at
'b'. White lacks a good continuation.]
LB[nc:b][ld:a]CR[ne])
)

(;B[le];W[lf];B[ke];W[md];B[qg];W[ld];B[kd];W[kc];B[jc];W[kb];B[jb];
W[lb];B[id])

(;B[nd]
C[This is not joseki.

White continues with 'a'. White 'b' is a hurried mistake.]
LB[md:b][pe:a]
(;W[pe]
C[Black 'a' is better than 'b'. Black 'c' is foolishly suicidal.]
LB[od:c][ne:b][qe:a]
(;B[qe];W[pf];B[qg];W[ne])

(;B[ne]
C[Black 7 is not recommended.

White continues with 'a' or 'b'.]
LB[qe:b][pd:a]
(;W[pd];B[qe];W[qf];B[qc];W[pf])

(;W[qe];B[mf];W[rd]C[White 10 secures a large corner.])
)

(;B[od]C[Black 7 is a mistake.];W[pd];B[pc];W[nc];B[md];W[qc];B[pb];
W[qb])
)

(;W[md]C[White 6 is a mistake.];B[nc];W[mc];B[mb];W[lb];B[ob];W[kc];
B[of]
C[Black 13 yields a huge corner. This is a great result for Black.])
)

(;B[pe]C[Black 5 is slow.];W[mc];B[ld];W[md];B[hc];W[qb])
)

(;W[ld]
C[Black continues with 'a *' if the top is favored, and yields
a good result. Black 'b' is balanced. Black 'c' is also possible;
Black should have the ladder to play 'c'.]
LB[md:c][mc:b][kd:a]
(;B[kd]
C[White 4 is peculiar to the 2-space low pincer. As it has the
drawback of an initial loss, it is seldom played.]
;W[mc];B[kc]
C[White continues with 'a *', 'b' or 'c *'. White must have the
ladder to play 'a'. 'd' is a mistake.]
LB[qf:d][qg:c][pg:b][pf:a]
(;W[pf]C[Black continues with 'a *' to 'c'. Black 'd' is bad style.]
LB[od:d][pc:c][pe:b][qf:a]
(;B[qf];W[qg];B[pg];W[qe];B[rf];W[of];B[re];W[ph]
C[White must have the ladder to play 16.];B[pb];W[og]
C[
* GOOD VARIATION *])

(;B[pe];W[oe];B[qf]C[White continues with 'a', not 'b'.]LB[pg:b][pd:a]
(;W[pd];B[qe];W[qc];B[rc];W[rb];B[pg];W[of]
C[Black continues with 'a'. Black 'b' is an overplay.]LB[qb:b][rd:a]
(;B[rd])

(;B[qb]C[Black 19 is an overplay.];W[pc];B[sb];W[qg];B[qh];W[rg];B[ra]
;W[qi]C[White 8 is a tesuji.];B[og];W[rh])
)

(;W[pg]
C[White 12 gives Black territory and White influence that is negated
by the three Black stones on the side.]
;B[qg];W[ph];B[qh];W[pi];B[qj])
)

(;B[pc];W[oe];B[rf];W[qg];B[rg];W[qi])

(;B[od]C[Black 9 approaches an enemy concentration needlessly.];W[pc];
B[pd];W[nd]C['a' and 'b' are miai; either gives White good shape.]
LB[qc:b][le:a])
)

(;W[pg];B[pe];W[me];B[pc];W[ng]C[A followup Black move at 'a' is big.]
LB[rg:a])

(;W[qg];B[pf]
C[White continues with 'a *'. White 'b' splits White into two groups
while Black solidifies.]
LB[pg:b][qc:a]
(;W[qc]C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[rc:b][qf:a]
(;B[qf];W[pd];B[re];W[rd];B[sd];W[qe];B[rg]C[
* GOOD VARIATION *])

(;B[rc]C[Black 11 is not recommended.];W[pd];B[qe];W[pg];B[of];W[le]
C[If Black plays 'a', White fights the ko.]LB[qb:a])
)

(;W[pg];B[of]C[White may try 'a' or 'b'.]LB[qf:b][le:a]
(;W[le];B[pc];W[od];B[qf])

(;W[qf];B[od];W[pc];B[pd];W[md];B[qc];W[lf];B[og])
)
)

(;W[qf];B[pe];W[pf];B[oe])
)

(;B[mc];W[oe]
C[Black continues with 'a'. Black 'b' is playable only if it works
well with the top-left, as the top-right corner and right side
suffers.]
LB[kd:b][pf:a]
(;B[pf];W[kd])

(;B[kd];W[qf])
)

(;B[md];W[mc]
C[Same variation of Black 5 and White 6 played before Black 3 and 
White 4, see there for continuation.]
LB[lc:3][ld:4][md:5][mc:6])
)

(;W[tt]
C[White plays elsewhere. White must have the ladder to play this
way. Black continues with 'a *' or 'b *'.]
LB[pc:b][od:a]
(;B[od]
C[White continues with 'a *' if the ladder is favorable, or 'b'
if not. White 'c', avoiding the ladder, gives black magnificant
thickness.]
LB[pc:c][nd:b][pd:a]
(;W[pd];B[pe];W[pc];B[nd];W[qc];B[re]
C[Both 'A *' and 'B' live, but only 'A' is joseki. White 'C' is
the older form of this joseki, and can lead to less favorable
results.]
LB[nc:C][rc:B][rb:A]
(;W[rb]C[
* GOOD VARIATION *

White is alive and can tenuki.];B[nc]
C[White still can tenuki.];W[tt];B[rc];W[sc];B[rd];W[qa]
C[White has kikashi on 'A' and 'B'.]LB[of:B][qf:A])

(;W[rc];B[nc];W[tt];B[ob];W[pb];B[nb];W[rd];B[qe];W[ra]
C[Because of White 12, White does not now have the kikashi on A.]
LB[rc:12][qf:A])

(;W[nc]
C[Black continues with 'a' to 'c'. The difference between 'a' and
'b' is the possibility of cutting points.]
LB[rc:c][md:b][mc:a]
(;B[mc];W[rc])

(;B[md];W[rd]
C[White 14 lets White live in sente. Since he cannot cut (because
of Black 13), making Black solid outside with White 14 does not
matter.]
;B[qe])

(;B[rc]C[Black 14 forces White low.];W[mc];B[md];W[lb];B[kc];W[kb];
B[jc])
)
)

(;W[nd];B[nc]
C[White continues with 'a'. White 'b' is a vulgar mistake.]
LB[pd:b][mc:a]
(;W[mc];B[nb];W[pd];B[oe];W[pe];B[pc];W[of]
C[Black continues with 'a' or 'b'.]LB[ob:b][ne:a]
(;B[ne];W[qc];B[ob];W[qe];B[pf];W[rd];B[pg];W[rg])

(;B[ob];W[ne];B[oc];W[nf];B[pf];W[pg];B[qf];W[qg];B[rf])
)

(;W[pd]C[White 8 is a mistake.];B[oe];W[pc];B[pe];W[nb];B[mc]
C[White continues with 'a'. White 'b' is unreasonable.]LB[qe:b][qc:a]
(;W[qc];B[re];W[rd];B[qe])

(;W[qe]C[White 14 doesn't work.];B[qc])
)
)

(;W[pc]C[White 6 give Black great thickness.];B[pd];W[mc];B[md];W[nc];
B[ld];W[qc];B[rd];W[rc];B[qj])
)

(;B[pc];W[od];B[pf]
C[White continues with 'a *'. White 'b' is less favorable.]
LB[le:b][me:a]
(;W[me]
C[After 'A *', the White stones are still light and open to attack.
After 'B' they become settled and safe, while Black gets a wall
in the middle of the top side.]
LB[le:B][kd:A]
(;B[kd];W[kf];B[ph]C[
* GOOD VARIATION *])

(;B[le];W[lf];B[ke];W[md]
C[Black continues with 'a', or if the ladder is favorable off 'a',
Black may continue with 'b'.]
LB[ic:b][ph:a]
(;B[ph];W[ld];B[kd];W[kc];B[jc];W[kb];B[jb];W[lb];B[kf])

(;B[ic]C[Black must have the ladder off Black 7 to play this way.];
W[qe]
C[Black continues with 'a' only with a favorable ladder, otherwise
Black must play 'b'.]
LB[qf:b][pe:a]
(;B[pe]C[Black must have the ladder to play this way.];W[pd]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[qf:b][qc:a]
(;B[qc];W[qf];B[pg];W[qg];B[qh];W[rh];B[ri]
C[White 'a' and Black captures the three White stones on the right.
White 'b' is a disaster for Black if Black does not have the
ladder.]
LB[ph:b][qi:a]
(;W[qi];B[ph];W[rj];B[rg];W[si];B[re])

(;W[ph];B[qi];W[og];B[oh];W[pi];B[of];W[ng];B[nf];W[mf];B[nh];W[mg];
B[pj])
)

(;B[qf]C[Black 17 is a mistake.];W[qc])
)

(;B[qf];W[pe];B[re];W[rf];B[rd];W[of];B[rg];W[pg];B[qg];W[ph])
)
)
)

(;W[le]
C[White cannot aim at 'a' by playing the capping play of White
8.]
LB[qe:a];B[jd];W[qe]
C[White 10 does not work. The sequence that follows shows why.];B[pe];
W[pd];B[qc];W[qf];B[ne]
C[Black 15 is sente, so Black can continue with ni-dan bane (2
step hane).]
;W[md]C[White must play 16 to stay connected.];B[qg];W[rg];B[rh])
)
)

(;W[oe]C[White 4 is not joseki with the two-space low pincer.];B[pf]
C['A' or 'B'.]LB[jc:B][ic:A]
(;W[ic];B[le];W[of]
C[White is pushing Black from behind, which is hopeless.];B[pg])

(;W[jc];B[le];W[of];B[pg])
)

(;W[qb]C[White 4 is too low for the first response.];B[od]
C[White continues with 'a'. White 'b' is a mistake.]LB[nd:b][pd:a]
(;W[pd];B[pe];W[pc];B[nd];W[qe];B[qf];W[re];B[pf];W[rd])

(;W[nd]C[White 6 is an overplay.];B[pc];W[pb];B[nc];W[ob];B[nb];W[oe];
B[pd])
)

(;W[pd]
C[White 4 is a mistake.

Black continue with 'a'. Black 'b' is weak.]
LB[qe:b][qc:a]
(;B[qc]C[White continues wtih 'a'. White 'b' is an overplay.]
LB[qe:b][pf:a]
(;W[pf];B[qe];W[nf];B[qg]C[White stones are thin.])

(;W[qe]C[White 6 is an overplay.];B[pe];W[re];B[oe];W[pc];B[qb]
C[Black 11 ensures that the three White stones are dead.];W[rd];B[nc];
W[nb];B[od])
)

(;B[qe]C[Black 5 is timid.];W[qc];B[rc];W[qb])
)
)

(;B[kc]
C[
Sangen Basami = Sekan Hyeopgong = San Jia = 3-Space Low Pincer
---------------------------------------------------------------

Black 1 is a pincer play said to have been developed by the 4th
Honinbo Dosaku (1645-1702). This move maintains overall balance
while attacking the White kakari stone. It is often used when
there is a White stone on the top-left star-point.

White's responses range from 'a *', 'b *', 'c *', 'd *', 'e *'.'f'
or g', and include playing elsewhere 'h *'.

White may need the ladder to play 'c'.

White reply at 'i' comes from a 19th century Japanese game.

'j' was played professionally.

'k' is possible.

i9, h8, g7, f6, e5, d4, c3, b2, a1

outcomes:
a1, b2, d4 - Black choice
c3 - White choice
e5 - Taisha
f6 - Black top, White right
g7 - White far top, right; Black corner, near right
h8 - White top
]
LB[pg:k][ld:j][ke:i][dp:h][ic:g][qg:f][pf:e][of:d][pe:c][pd:b][qc:a]
(;W[qc]C[Black continues with 'a *'. Black 'b' is an overplay.]
LB[pc:b][rc:a]
(;B[rc];W[pd]C[Black continues with 'a *' or 'b'.]LB[qb:b][qe:a]
(;B[qe];W[qb]C[Black continues with 'a *' or 'b'.]LB[qh:b][pg:a]
(;B[pg]C[
* GOOD VARIATION *])

(;B[qh];W[pe];B[pf];W[of];B[pg])
)

(;B[qb];W[qe];B[pc]
C[White continues with 'a'. White 'b' is a mistake.]LB[pb:b][rd:a]
(;W[rd];B[qc];W[oe];B[tt]C[Black plays elsewhere.];W[nb]
C[White 13 is better than White 'a'. This forces Black to capture
White 10.]
LB[ob:a];B[re];W[rf];B[sd];W[qf])

(;W[pb]
C[White 10 is a mistake. The pincer of Black 3 is still effective.

Black continues with 'a'. Black 'b' is a mistake.]
LB[qc:b][pe:a]
(;B[pe];W[qc];B[rd]
C[White continues with 'a'. White 'b' is a bit unreasonable.]
LB[qf:b][od:a]
(;W[od];B[qf]
C[Black 5 takes profit while the pincer of Black 3 still has meaning.])

(;W[qf]
C[White 14 is not recommended. White has created two weak groups.];
B[oe]
C[Black 15 helps Black's weak stone. Black has an advantage in
the coming fight: White cannot start the ko to attack Black's
corner. Thus, White has two weak groups.])
)

(;B[qc]C[Black 11 is a mistake.];W[oe]
C[Now White 10 is more effective than having been played on the
other side. Black's pincer now looks lonely.])
)
)
)

(;B[pc]
C[Black 5 is overly aggressive.

White continues with 'a'. White 'b' is a mistake.]
(;W[pd];B[pb];W[qe];B[rd];W[qb]C[Black 'a' is better than 'b'.]
LB[pe:b][ob:a]
(;B[ob];W[re];B[od];W[pe])

(;B[pe]
C[Black 11 is not as favorable as playing x. At best, Black 11
represents a special strategy.]
MA[ob];W[od];B[qf])
)

(;W[pb]C[White 6 is weak.];B[pd];W[rb];B[rc];W[qb];B[od];W[nc];B[nd])
)
)

(;W[pd]
C[Black continues with 'a' or 'b *'. 
Black 'c' is an overplay.
Black 'd' is an odd move.

outcomes:
a1 - Black right, White corner
b2 - Black top, White big corner]
LB[pf:d][pe:c][qc:b][qe:a]
(;B[qe];W[qc];B[rc];W[qb];B[pg]
C[Later in the followup, as the marked stone is far, A and B are
miai.]
LB[mc:B][rb:A]TR[kc])

(;B[qc];W[qe]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[re:b][pe:a]
(;B[pe];W[re];B[oe];W[pc];B[qb]
C['A *' and 'B' are joseki, 'C' is a mistake.]LB[mc:C][nd:B][rd:A]
(;W[rd]C['A' or 'B'.]LB[mc:B][nc:A]
(;B[nc];W[nb]
C['A' is ok, 'B' encloses or crushes White with the ladder.]
LB[mb:B][mc:A]
(;B[mc];W[mb]
C[The two space high pincer has the same variation, refer to that
joseki.]
;B[lb];W[pb]C[
* GOOD VARIATION *])

(;B[mb];W[nd];B[mc];W[od];B[me];W[ne]
C[This move doesn't work without the ladder.];B[nf];W[of];B[pf];W[og];
B[pg];W[ph];B[qg];W[mf];B[ng];W[oh];B[md];W[mg];B[ob]
C[Without the ladder, Black can get a good result here.];W[nh];B[nf])
)

(;B[mc];W[pb];B[nc];W[rb])
)

(;W[nd]C['A' or 'B'.]LB[ne:B][mc:A]
(;B[mc];W[ld])

(;B[ne];W[rd];B[md];W[mc];B[lc];W[mb];B[qf];W[rf];B[qg];W[me];B[ld];
W[rb];B[mf])
)

(;W[mc]
C[Black can choose, if he wants to enclose White on 'A' or live
in the corner and keep White separerated on 'B'.]
LB[rd:B][qf:A]
(;B[qf];W[rf];B[qg];W[rg];B[qh];W[rd];B[rc];W[sb];B[le])

(;B[rd];W[qg];B[pb];W[ob];B[sb])
)
)

(;B[re]C[Black 7 is weak.];W[rf];B[qf];W[pe]
C[Black must play 'a'. Black 'b' is unreasonable regardless of
the ladder.]
LB[rd:b][rg:a]
(;B[rg];W[rd];B[sf];W[rc])

(;B[rd]C[Black 11 is unreasonable.];W[rg]
C[Black must play to live in the corner, allowing White to capture
Black 9 and gaining great position.])
)
)

(;B[pe]
C[Black 5 is an overplay.

White continues with 'a'. White 'b' is not as favorable.]
LB[qe:b][qc:a]
(;W[qc]C[Black continues with 'a'. Black 'b' is crude.]LB[od:b][qe:a]
(;B[qe];W[oe];B[of];W[ne];B[rc];W[qb];B[qh]
C[Black gets a result better than joseki.])

(;B[od]C[Black 7 is crude.];W[pc];B[nd];W[re]
C[White 10 is a tesuji, allowing White to connect underneath, thus
giving White a good result.])
)

(;W[qe]
C[White 6 reverts to joseki, but in doing so, White has missed
an opportunity for a better result.]
;B[qc]
C[For continuation, see the variaton of Black 7 played before 5.]
LB[qc:7][pe:5])
)

(;B[pf]C[White continues with 'a'. White 'b' is a mistake.]
LB[qe:b][qc:a]
(;W[qc]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pe:b][qe:a]
(;B[qe];W[rc])

(;B[pe]C[Black 7 is not recommended.];W[rd];B[qe];W[nd])
)

(;W[qe]C[White 6 is an overplay.];B[pe];W[qc];B[rd];W[re];B[od];W[pc];
B[rf]C[Black 13 give Black nice thickness.])
)
)

(;W[pe]
C[White may need the ladder to play this way.

Black continues with 'a *'. 

Black 'b' is not recommended unless cirucumstances favor it,
the variation shown in 'c'.]
LB[qj:c][pd:b][qe:a]
(;B[qe]C[White continues with 'a *' or 'b *'.]LB[qc:b][pf:a]
(;W[pf]C['A' is usual, 'B' is possible.]LB[qf:B][qg:A]
(;B[qg]C['A' or 'B'.]LB[qc:B][ic:A]
(;W[ic];B[ke]C[
* GOOD VARIATION *];W[qc]
C[White must have the ladder to play 1.

Black continues at 'a'. Black 'b' is a mistake.]
LB[rc:b][pg:a]
(;B[pg];W[pd];B[ng];W[qf];B[rf];W[rc])

(;B[rc]C[Black 11 is a mistake.];W[qf];B[rf];W[rg];B[re];W[qh])
)

(;W[qc]C['A' or 'B'.]LB[pd:B][pg:A]
(;B[pg];W[pd];B[ng];W[qf];B[rf];W[rg];B[rh])

(;B[pd];W[od];B[pc];W[qf];B[rf];W[pb];B[qb];W[rc];B[re];W[rb];B[ob];
W[qa];B[oe];W[nb];B[ne])
)
)

(;B[qf];W[pg];B[qh];W[ic];B[ke])
)

(;W[qc]C[Black continues with 'a' or 'b *'. Black 'c' is a mistake.]
LB[pd:c][pf:b][rc:a]
(;B[rc]
(;W[pf];B[pd];W[od];B[pc];W[nf];B[hc])

(;W[qb]C[White 8, a natural move, is not correct.];B[pf];W[pd];B[qg]
C[This result is favorable to Black.])
)

(;B[pf]C[White continues at 'A *'. White 'B' solidifies Black more.]
LB[pd:B][pc:A]
(;W[pc]C[White 8 is too weak.];B[qi]C[
* GOOD VARIATION *])

(;W[pd]
C[Black continues with 'a'. Black 'b' leads to a fight Black may
not like.]
LB[rc:b][qg:a]
(;B[qg];W[rf];B[qf];W[rc];B[qj])

(;B[rc]C[Black 9 is a tough move that may be an overplay.];W[qf];B[qb]
;W[pc];B[re];W[rf];B[se];W[qh];B[of];W[ld])
)
)

(;B[pd]C[ Black 7 is a mistake.];W[pc];B[od];W[nd];B[ne];W[md]
C[White gets a favorable result.])
)
)

(;B[pd]
C[Black 5 is inconsistent with the leisurely distance of the pincer.
White should not have a problem settling himself.]
;W[od];B[oe];W[pf];B[ne];W[qb];B[rf];W[qg];B[rb];W[pb];B[rc];W[md];
B[rg];W[qi])

(;B[qj]
C[Black may push through with 'a' if he has support such as at
Black 5.]
LB[pd:a];W[pi]
C[The shoulder hit at White 6 is helpful if Black pushes through
and cuts at 'a'.]
LB[pd:a];B[pd];W[od];B[oe];W[pf];B[ne];W[qb];B[rf])
)

(;W[of]C[Black continues with 'a *', 'b *' or 'c'.]
LB[hc:c][oe:b][qg:a]
(;B[qg];W[ic]C[Black continues with 'a *' or 'b'.]LB[mc:b][ke:a]
(;B[ke];W[ie];B[kg]C[White continues with 'a *' or 'b'.]LB[ig:b][qc:a]
(;W[qc];B[rc]
C[White continues with 'a *'. White 'b' is not recommended.]
LB[rd:b][pd:a]
(;W[pd]C[Black continues with 'a *' or 'b'.]LB[qb:b][qe:a]
(;B[qe];W[qb]C[
* GOOD VARIATION *])

(;B[qb];W[qe];B[pc];W[rd];B[qc];W[qf];B[od];W[nd];B[pe];W[pf];B[ne];
W[qi];B[me])
)

(;W[rd]
C[White 12 is selfish. Black plays 'a' while White hopes for 'b'.]
LB[re:b][qe:a]
(;B[qe];W[rb];B[pc];W[qb];B[od];W[pb];B[nd];W[pd];B[pe])

(;B[re]C[Black 13 is a mistake.];W[pd];B[qe];W[rb])
)
)

(;W[ig];B[pc]C[White continues with 'a' or 'b'.]LB[pe:b][od:a]
(;W[od];B[pe];W[oe];B[ph];W[mh];B[ki];W[oh];B[pj];W[mj])

(;W[pe];B[qe];W[pb]C[Black continues with 'a' or 'b'.]LB[nc:b][qb:a]
(;B[qb];W[pd];B[qc];W[mc])

(;B[nc];W[qc];B[pd];W[od];B[nb];W[ob];B[qb];W[oh])
)
)
)

(;B[mc]C[White continues with 'a' or 'b'.]LB[pd:b][qc:a]
(;W[qc];B[rc]C['A' is correct, 'B' is questionable.]LB[qb:B][pd:A]
(;W[pd];B[qb];W[qe];B[pc];W[rd];B[qc];W[qf];B[od];W[nd];B[pe];W[pf];
B[nc];W[qi])

(;W[qb]C[Black A is questionable.]LB[od:A];B[od];W[nd];B[pd];W[nc])
)

(;W[pd];B[qc];W[qe];B[re];W[rf];B[qf];W[pe];B[rd];W[oh])
)
)

(;B[oe];W[ne];B[pe]C[White continues with 'a *' or 'b'.]LB[lc:b][nd:a]
(;W[nd];B[nf]C['A *' is joseki, 'B' is bad.]LB[mf:B][og:A]
(;W[og]C[Black continues with 'A *' or 'B'.]LB[mf:B][ng:A]
(;B[ng];W[oh]C['A *' is joseki, 'B' is a less favorable variation.]
LB[nh:B][lf:A]
(;B[lf];W[qb];B[qg]C[
* GOOD VARIATION *])

(;B[nh];W[qf];B[pf];W[qg];B[qe];W[pg];B[pc];W[le])
)

(;B[mf];W[ld])
)

(;W[mf];B[ng];W[le];B[og]
C[The marked stone is not surrounded, so the position is not equal.]
TR[kc])
)

(;W[lc]C[Black continues with 'a' or 'b'.]LB[kd:b][nf:a]
(;B[nf]C['A' is correct, 'B' is questionable.]LB[kd:B][me:A]
(;W[me];B[og];W[mf];B[ng];W[kb])

(;W[kd]
C['A' leaves White without a good answer. If he is weak, Black
can be satisfied with 'B'.]
LB[og:B][jc:A]
(;B[jc])

(;B[og];W[jc])
)
)

(;B[kd];W[nf]C[Black continues with 'a' or 'b'.]LB[lb:b][qg:a]
(;B[qg];W[lb])

(;B[lb];W[mc];B[qg];W[hd])
)
)
)

(;B[hc];W[qf]
C[Black continues at 'a' or 'c'.

Even if Black plays elsewhere ('b'), the 3-4 stone retains aji.]
LB[od:c][dp:b][pc:a]
(;B[pc];W[od];B[ob];W[nb];B[pb])

(;B[dp]C['A' or 'B'.]LB[lc:B][qc:A]
(;W[qc];B[pc]C[White continues with 'a'. White 'b' fails.]
LB[pd:b][pb:a]
(;W[pb];B[pd];W[qb];B[od]C[Black escapes.];W[nc];B[nd];W[md]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[ne:b][me:a]
(;B[me]C[White continues with 'a'. White 'b' is not recommended.]
LB[ne:b][lc:a]
(;W[lc];B[nf];W[kd])

(;W[ne]C[White 18 starts a fight White is likely to lose.];B[mc];W[ld]
;B[mb])
)

(;B[ne]C[Black 17 is not recommended.];W[mc];B[pg];W[pf];B[nf];W[og];
B[le])
)

(;W[pd]C[White 10 is a mistake.];B[pb]
C['A' is correct, 'B' is a mistake.]LB[ob:B][qb:A]
(;W[qb];B[od];W[pe];B[ob];W[nc];B[nb]
C[White 'a' and Black captures the corner with 'b'. White 'b' and
Black captures two White stones (2 & 16).]
LB[rd:b][mc:a]
(;W[mc];B[rd])

(;W[rd];B[nd])
)

(;W[ob];B[pe];W[od];B[qe];W[rc];B[pf])
)
)

(;W[lc];B[ld];W[mc];B[kd];W[qb])
)

(;B[od]C['A' or 'B'.]LB[pc:B][nd:A]
(;W[nd];B[pc];W[oe];B[pd];W[ob];B[pb];W[mc];B[re])

(;W[pc];B[pd];W[nd];B[qc];W[mc];B[rf];W[rg];B[re])
)
)
)

(;W[pf]
C[White 4 introduces the taisha, but there are not as many variations
as with the 5-3 point.
Both 'A *' and 'B *' are joseki. 'C' is similar to 'A', but inferior.]
LB[qf:C][od:B][pe:A]
(;B[pe];W[oe]C['A *' is joseki. 'B' is a mistake,]LB[od:B][qf:A]
(;B[qf];W[pg];B[qg];W[ph]
C[Black on 'A *' is joseki, 'B' is a mistake.]LB[qi:B][qh:A]
(;B[qh];W[pi];B[qj];W[ic]C[
* GOOD VARIATION *])

(;B[qi];W[pd];B[qe];W[qc];B[rc];W[rb];B[qb];W[pc];B[sb];W[qh];B[rh];
W[ri])
)

(;B[od];W[nd];B[pd];W[ne];B[nc];W[mc];B[nb];W[lc];B[ob];W[kd]
C[The marked stone is wasted now.]TR[kc])
)

(;B[od]
C[White continues with 'a *' or 'b *'. White can only play 'b'
with a favorable ladder.]
LB[nd:b][pd:a]
(;W[pd];B[pe];W[pc];B[qe];W[oe];B[nd];W[qc]
C[Black continues with 'a *' to 'c'.

c3, b2, a1]LB[re:c][rc:b][qf:a]
(;B[qf];W[of];B[qh]
C[White continues with 'a *', or if the ladder is favorable, may
play 'b'.]
LB[mc:b][mb:a]
(;W[mb];B[ld];W[oh];B[pj];W[lg]C['A *' or 'B'.]LB[id:B][je:A]
(;B[je]C[
* GOOD VARIATION *])

(;B[id])
)

(;W[mc]C[White must have the ladder to play this way.];B[md];W[ld]
C[Black continues with 'a'. Black 'b' falls into a trap.]
LB[nc:b][lc:a]
(;B[lc];W[nc]
C[Black must not be able to capture White 18 by playing 'a' for
White to play this way.]
LB[le:a])

(;B[nc]C[Black 19 is a mistake.];W[nb];B[mb];W[lc];B[ob];W[na]
C[Black may try 'a' or 'b'. Both fail, though 'b' may be preferable.]
LB[me:b][ma:a]
(;B[ma];W[me];B[oa];W[nb];B[na];W[ne];B[nb];W[lb];B[rc];W[qb];B[rb];
W[pa])

(;B[me];W[lb];B[rc];W[pb])
)
)
)

(;B[rc];W[rb];B[qg];W[mb];B[ld];W[of];B[rd]
C[Joseki continues with White 'a'.

White 'b' was played by Akaboshi Intetsu in 1835 against Honinbo
Jowa. This game was nicknamed "Intetsu's blood-vomiting game",
because of a stomach hemorrhage Intetsu had (and died of a month
later).]
LB[qi:b][ph:a]
(;W[ph];B[qh];W[pi];B[rj];W[lg];B[je])

(;W[qi]C[White 18 is not joseki; Black gains a favorable position.];
B[ph];W[pi];B[oh];W[mf];B[qb]
C[Black 6 is a clever move. White continues with 'a'. White 'b'
is less favorable.]
LB[qa:b][pb:a]
(;W[pb];B[ra]
C[White continues with 'a'. White 'b' gives a flower-viewing ko
(nothing to lose), inviting defeat.]
LB[sb:b][nc:a]
(;W[nc];B[me];W[sb];B[lf];W[mg];B[lg];W[mh];B[oi];W[lh];B[pk])

(;W[sb]C[White 28 is premature, and a mistake.];B[nc];W[nb];B[pa])
)

(;W[qa]C[White 26 eliminates ko potential, but at a cost.];B[sb];W[ra]
;B[nb];W[nc];B[mc];W[ob];B[lb];W[na])
)
)

(;B[re]C[White continues with 'a'. White 'b' is less favorable.]
LB[rc:b][mb:a];W[mb];B[md];W[nf];B[rc];W[rb];B[sb];W[ra];B[qh]
C[White continues with 'a'. White 'b' and White suffers a squeeze
in sente on the corner stones.]
LB[lf:b][mc:a]
(;W[mc];B[le];W[lg])

(;W[lf]C[White 22 is a mistake.];B[qb];W[pb];B[nb];W[nc];B[mc];W[lb];
B[pa];W[qa];B[oa];W[ma];B[kb];W[na])
)
)

(;W[nd]C[White must have the ladder to play 6.];B[oe];W[pc]
C[Black continues with 'a *' if the ladder is unfavorable (Black
5 & 7 can be captured in a ladder), or 'b' if the ladder works
for Black. White should not have played White 6 if the ladder
works for Black.

Black 'c' was played by Hashimoto Utaro against Kajiwara in 1974.]
LB[of:c][qc:b][qe:a]
(;B[qe];W[qc];B[qi]C[
* GOOD VARIATION *])

(;B[qc];W[pd];B[pe];W[qe];B[qf];W[re];B[rf];W[of])

(;B[of]
C[White continues with 'a'. White 'b' and 'c' are unreasonable.]
LB[pd:c][pg:b][qc:a]
(;W[qc];B[re]
C[White continues with 'a', which is better than White 'b'.]
LB[rc:b][rd:a]
(;W[rd];B[qe];W[mc])

(;W[rc]
C[Black can aim at the cutting point of 'a' later if the ladder
favors him.]
LB[nc:a])
)

(;W[pg];B[qc]
C[White cannot push through and cut as the ladder no longer exists.])

(;W[pd]C[White 10 is unreasonable.];B[pe];W[qe];B[qf];W[re]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[pg:b][nc:a]
(;B[nc]C[White continues with 'a', not 'b'.]LB[qc:b][rd:a]
(;W[rd];B[pb]C[Black 17 is a tesuji.];W[qc];B[pg];W[mc];B[nb];W[mb];
B[md];W[ne];B[ob])

(;W[qc]C[White 16 is a mistake.];B[rf];W[rd];B[pg];W[mc];B[nb];W[mb];
B[md];W[ne];B[mf])
)

(;B[pg]C[Black 15 is a mistake.];W[rd])
)
)
)
)

(;B[qf];W[pe];B[qe];W[pg];B[qh];W[ic])
)

(;W[qg];B[pe];W[qj]C[Black continues with 'a' or 'b'.]LB[pc:b][nd:a]
(;B[nd];W[mc]C[Black continues with 'a' to 'c'.]LB[ld:c][md:b][nc:a]
(;B[nc];W[nb];B[md];W[lc];B[ld];W[kb];B[jb];W[jc];B[kd];W[lb];B[ic]
C[Black needs the ladder.];W[qb];B[pc];W[pb];B[od]
C[White continues with 'a'. White 'b' is a mistake.]LB[rc:b][ob:a]
(;W[ob];B[jd])

(;W[rc]C[White 24 is a mistake.];B[ob];W[oa];B[ma];W[na];B[ka];W[mb]
C[If White now plays 'a', Black can play 'b'.]LB[hb:b][jd:a])
)

(;B[md];W[lc]C[Black continues with 'a'. Black 'b' is an overplay.]
LB[kd:b][ld:a]
(;B[ld];W[kb]C[Black continues with 'a'. Black 'b' is weak.]
LB[jc:b][jb:a]
(;B[jb];W[jc];B[kd]
C[White continues with 'a'. White 'b' is less favorable.]
LB[lb:b][ib:a]
(;W[ib];B[nc])

(;W[lb];B[ic];W[qb];B[rb]C[White 'a' is better than White 'b'.]
LB[pb:b][qc:a]
(;W[qc];B[rc];W[re];B[rd];W[pc]
C[If the Black 'a', White 'b' exchange had been made, White 24
would not be necessary. As it is, without White 24, Black 'c'
kills the White group.]
LB[qa:c][nb:b][nc:a])

(;W[pb];B[qc]
C[White must play 'a'. White cannot afford to play elsewhere ('b').]
LB[dp:b][nc:a]
(;W[nc])

(;W[tt]C[White plays elsewhere, and will be killed for it.];B[nb];
W[nc];B[ka];W[la];B[oa])
)
)
)

(;B[jc]C[Black 13 is weak.];W[jb];B[ic];W[pb])
)

(;B[kd]C[Black 11 is an overplay.];W[kb];B[jb];W[ld];B[le];W[ke];B[lf]
;W[lb];B[id];W[qc];B[rc];W[pc];B[re]
C[Black must play 23 to defend against White 'a'.]LB[oe:a])
)

(;B[ld]C['A' is correct, 'B' is inferior.]LB[qc:B][qb:A]
(;W[qb];B[rb];W[kb];B[jb]
C[White continues with 'a'. White 'b' is premature, and leads to
ko.]
LB[lb:b][md:a]
(;W[md];B[me];W[lb];B[jc];W[qc];B[rc];W[pc];B[ne]C[The joseki ends.];
W[tt]C[White plays elsewhere.];B[nc];W[nb];B[ka]
C[White continues with 'a'. White 'b' is a deadly mistake.]
LB[la:b][ma:a]
(;W[ma];B[lc];W[oa])

(;W[la]C[White 25 is a mistake.];B[oa];W[pa];B[ob];W[na];B[mb])
)

(;W[lb]C[White 14 is a mistake.];B[md]C[White must add a stone.];W[tt]
C[White plays elsewhere, a mistake.];B[nc];W[nb];B[ka];W[ma];B[lc];
W[oa];B[mb]C[White must fight the ko for life.])
)

(;W[qc];B[rc];W[rb];B[pc];W[qb];B[od];W[rd];B[re];W[sc])
)
)

(;B[pc]C[White continues with 'a' or 'b'. White 'c' is heavy.]
LB[od:c][ld:b][pb:a]
(;W[pb];B[qb];W[of];B[nd]C[Later, White can play on A.]LB[rc:A])

(;W[ld];B[kd];W[le];B[ke];W[lf];B[jg];W[lh])

(;W[od]C[White 8 is heavy.];B[md];W[oe];B[pf];W[nf];B[pg])
)
)

(;W[ic]
C[White 4 may be appropriate when White has support at top left.

Black continues with 'a'. Black 'b' is slow. 'c' is inferior.]
LB[pc:c][pe:b][pf:a]
(;B[pf]C['A' is correct, tenuki 'B' is inferior.]LB[dp:B][qc:A]
(;W[qc];B[rc]LB[qb:B][pd:A]
(;W[pd]LB[qb:B][qe:A]
(;B[qe];W[qb])

(;B[qb];W[qe];B[pc];W[rd];B[qc];W[pe];B[od]
C[White continues with 'a' or 'b', 'a' if the ladder is favorable,
'b' if not.]
LB[oe:b][of:a]
(;W[of]
C[White must have the ladder from Black 15 (at 'b') to play this
way.

Black continues with 'a'. Black 'b' is weak.]
LB[nd:b][oe:a]
(;B[oe];W[qf];B[pg];W[og];B[oh];W[nh]
C[Black continues with 'a'. Black 'b' is a mistake. 

Black 'c' gives White superior thickness for 20 points of Black
territory.]
LB[ng:c][md:b][nf:a]
(;B[nf];W[ng];B[mi];W[mf];B[nc];W[nd];B[ob];W[ne];B[oc];W[oi];B[ph];
W[pi];B[rg];W[rh];B[qg];W[ni]C[The result slightly favors Black.])

(;B[md]C[Black 23, trying to block White's ladder, is a mistake.];
W[ph];B[qg];W[rg];B[qh];W[qi];B[pi];W[rh])

(;B[ng]
C[Black 23 gives Black about 20 points of territory, but White
has superior thickness.]
;W[nf];B[mf];W[mg];B[ne];W[ng];B[qg];W[rg];B[rh];W[me];B[nd];W[mc];
B[nc];W[nb];B[ob];W[md];B[oc];W[oi];B[qh];W[lf])
)

(;B[nd]C[Black 17 is submissive, and give White good shape.];W[pg];
B[ld])
)

(;W[oe]C[White 16 if ladders are unfavorable.];B[nd]
C[White continues with 'a' or 'b'.]LB[ld:b][of:a]
(;W[of];B[ld])

(;W[ld]
C[White 18 is a preference in style compared to the previous variation.
White 18 is intended to annoy and for later aji.]
;B[ne];W[of];B[kd];W[le];B[nf];W[og];B[lc])
)
)
)

(;W[qb];B[pd];W[mc])
)

(;W[dp];B[pc];W[od];B[ke];W[mf])
)

(;B[pe]
C[Black 5 was popular around 1800, when Genjo and Chitoku were
playing. It is a slow way of playing.]
;W[nd];B[ke];W[ld];B[kd];W[qb])

(;B[pc];W[od];B[pf];W[ke])
)

(;W[tt]C[White plays elsewhere.
'A *' is correct, 'B' is inferior.]
LB[od:B][pc:A]
(;B[pc]C['A *' is correct, 'B' is bad.]LB[pe:B][od:A]
(;W[od];B[pf]
C[White continues with 'a *' or 'b'. White 'c' is not recommended.]
LB[ld:c][ke:b][le:a]
(;W[le]C[Black continues with 'a *', 'b *' or 'c'.]
LB[hc:c][ke:b][jd:a]
(;B[jd];W[jf];B[ph]C[
* GOOD VARIATION *])

(;B[ke];W[kf];B[je];W[ld];B[lc];W[mc]C[
* GOOD VARIATION *];B[hc];
W[lg];B[ph])

(;B[hc];W[id];B[ic];W[lc];B[lb];W[kd];B[jc];W[mc];B[ph])
)

(;W[ke]C[Black continues with 'a' or 'b'.]LB[id:b][le:a]
(;B[le];W[lf];B[me];W[of]C['A' or 'B'.]LB[mf:B][kf:A]
(;B[kf];W[pg];B[qf];W[qg];B[je];W[pd];B[qc];W[rf];B[re];W[qe];B[pe];
W[oe];B[qe];W[nh])

(;B[mf];W[pe];B[qe];W[kf];B[kd];W[oh];B[mg];W[pg];B[qf];W[qg])
)

(;B[id];W[lc]C[Black starts a fight with 'a'. Black 'b' is too mild.]
LB[lb:b][ld:a]
(;B[ld]
C[Black starts a fight with 11.

White continues with 'a'. White 'b' is a mistake.]
LB[kd:b][pd:a]
(;W[pd]C[Black continues with 'a' or 'b'.]LB[qc:b][qe:a]
(;B[qe]C[White continues with 'a'. White 'b' is a mistake.]
LB[kd:b][qc:a]
(;W[qc];B[rc];W[pb];B[mc];W[rb])

(;W[kd]C[White 14 is a mistake.];B[mc];W[lb];B[mb];W[md];B[le];W[kb];
B[jc];W[jb];B[ib];W[nb];B[me];W[nd];B[pb];W[of];B[kf];W[og];B[qh])
)

(;B[qc];W[kd];B[mc];W[lb];B[mb]
C[White continues with 'a'. White 'b' is a mistake.]LB[kb:b][md:a]
(;W[md];B[le];W[kb];B[jc];W[jb];B[ib];W[nb];B[me];W[nd];B[nf];W[pb];
B[qb];W[pa];B[qg]C[Black 31, to prevent White 'a', cannot be omitted.]
LB[qe:a];W[jf])

(;W[kb]C[White 18 is a mistake.];B[me];W[jc];B[nf])
)
)

(;W[kd]C[White 12 is a mistake.];B[mc];W[lb];B[mb];W[md];B[le];W[kb];
B[jc];W[jb];B[ib];W[nb];B[me];W[nd];B[nf];W[pd];B[qe];W[qc];B[rc];
W[pb];B[kf])
)

(;B[lb]C[Black 11 is too mild.];W[ld]
C[Black 'a' is honte (proper), but gives White a start on a favorable
fight. Black 'b' gives White Black 11. Thus Black 11 is bad.]
LB[ph:b][jb:a]
(;B[jb];W[qe]
C[White provokes a fight with 14.
Black continues with 'a'. Black 'b' is unbearably submissive.]
LB[qf:b][pe:a]
(;B[pe];W[pd]C[Black continues with 'a'. Black 'b' gives up too much.]
LB[qf:b][qc:a]
(;B[qc];W[qf]C[A fight where Black's prospects are not great.])

(;B[qf]C[Black 17 is bad.];W[qc];B[re];W[rc])
)

(;B[qf];W[pe];B[re]C[White continues with 'a' or 'b'.]LB[rd:b][rf:a])
)

(;B[ph];W[jc];B[jd];W[kb];B[kd];W[ib])
)
)
)

(;W[ld]C[White 8 does not work well.];B[kd];W[le];B[ke];W[lf]
C[Black continues with 'a' or 'b'.]LB[jg:b][gc:a]
(;B[gc];W[qe];B[qf];W[pe];B[re];W[rf]
C[Black continues with 'a' to keep the corner or 'b' to emphasize
the side.]
LB[rg:b][rd:a]
(;B[rd];W[of];B[rg])

(;B[rg];W[rd];B[sf];W[qc]C[Black extends somewhere around 'a' to 'c'.]
LB[oh:c][pi:b][ph:a])
)

(;B[jg];W[qe];B[qf];W[pe];B[re];W[rf];B[rd];W[of];B[rg])
)
)

(;W[pe];B[pd];W[oe];B[od];W[qe];B[ne];W[nf];B[me])
)

(;B[od];W[nd];B[oe];W[pc];B[qc];W[mc]
C[The space of the White group is already limited by the marked
stone.]
TR[kc])
)

(;W[ke]AB[dc][dq][cp][bq][cr][do][fo][fn]
AW[fm][gn][go][fp][ep][eq][pq]
C[White 4 was played in an 1822 game between Honinbo Jowa (White)
and Toyama Sansetsu (Black).]
;B[je];W[jf];B[jd];W[if];B[he];W[pe];B[qe];W[pg];B[pf];W[of];B[qf];
W[qh]
C[White 16 is usually unreasonable, as Black can cut, but White's
thickness in the center (White 4, 6, 8, and stones on the lower
left) makes it possible in this instance.]
;B[pc]C[Black 17 is necessary to live in the corner.];W[pn]
C[White starts a moyo, revealing the logic for White 16.];B[kq];W[mq];
B[hq];W[dl];B[dm];W[em];B[dn];W[ip];B[mr];W[iq];B[nq];W[no];B[mp];
W[ln];B[pr];W[mf];B[hf];W[de];B[ce];W[cf];B[cd];W[hg];B[gg];W[hh];
B[gh];W[gi];B[eh];W[ci];B[qq];W[dg];B[ef];W[eg];B[ff];W[df];B[fi];
W[ec];B[ed];W[dd];B[cc];W[ee];B[fd];W[fe];B[ge];W[gd];B[fc];W[ie];
B[hd];W[gc];B[eb];W[id];B[hc];W[ic];B[ib];W[gj];B[rn];W[ro];B[qi];
W[pi];B[qj];W[rh];B[qn];W[qo];B[pm];W[pp];B[on];W[po];B[om];W[ql];
B[rl];W[or];B[oo];W[qr];B[pj];W[np];B[nr];W[op];B[jr];W[ir];B[lp];
W[oi];B[pl];W[ob];B[od];W[mc];B[pb]
C[Move 103 in the diagram (actual move: 119) was the last move
of the game. This game is known as "the eternally unfinished
game".])

(;W[ld]
C[Played by Cho U Honinbo against Yoda Norimoto Meijin in the 5th
game of the 29th Meijin title match 2004.]
;B[lc];W[mc];B[kd];W[le];B[ke];W[lf]C['A' or 'B'.]LB[pe:B][qg:A]
(;B[qg])

(;B[pe])
)

(;W[pg];B[pe];W[mg];B[nd]
C[White 6 is only good for building a moyo on the right, that means,
if there are additional White stones in the lower right. Later,
White will use the aji of White 2 to make a small life with it.]
LB[oc:2][mg:6])
)

(;B[md]
C[
Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia = 1-Space High Pincer
----------------------------------------------------------------------------

Black 3 is typical of the severity of modern Go. White cannot
afford to play elsewhere ('f'). Responses range from 'a *', 'b
*', 'c *' to 'd *'. White 'e' is a trick play, not joseki. 'g'
and 'h' are special strategies.

f6, e5, d4, c3, b2, a1
]
LB[pd:h][qh:g][dp:f][pe:e][mc:d][qc:c][ne:b][oe:a]
(;W[oe];B[pf]
C[White continues with 'a *' to 'c'. White 'b' does not work very
well with the high pincer, so is not recommended.
'd' is a mistake.]
LB[qc:d][me:c][ph:b][kd:a]
(;W[kd]
C['A *' and 'B *' are joseki, 'C' is possible with a strong Black
position in the upper left and aims at sacrificing to close in
a small White area. 'D' is questionable.]
PL[2]LB[mc:D][mb:C][pc:B][mf:A]
(;B[mf]
C[White continues with 'a *'. White 'b' is bad, as it gives Black
solidity on the fourth line.]
LB[of:b][mc:a]
(;W[mc];B[nd];W[nc];B[od]
C[Joseki continues with White 'a *'. White 'b' is unreasonable
resistance.]
LB[pd:b][pc:a]
(;W[pc]
C[Black continues with 'a *' or 'b'. Black 'a' as joseki is recent.
Black 'b' is the old pattern - Black takes more area, but may
end in gote and loses the hane at the red dot.]
LB[qc:b][pd:a]CR[lc]
(;B[pd]C[
* GOOD VARIATION *])

(;B[qc];W[pd];B[pe];W[ld];B[of])
)

(;W[pd]
C[Black 'a' is best, as White 12 is unreasonable. If Black 'b',
White 'a', and the old joseki pattern starting with White 12
on a results.]
LB[pe:b][pc:a];B[pc];W[pe];B[qe];W[of];B[og]
C[White may try 'a' or 'b'. Neither are favorable for White.]
LB[qc:b][qf:a]
(;W[qf];B[nf];W[pg];B[ne];W[pf];B[qc]C['a' and 'b' are miai.]
LB[ph:b][lc:a])

(;W[qc];B[pb];W[qf];B[nf];W[pg];B[ne];W[pf];B[rc];W[ld];B[ph];W[oh];
B[ng];W[qh];B[pi];W[re];B[rd];W[rg];B[se];W[rf];B[ri];W[qi];B[qj];
W[pj];B[oi];W[rj];B[qk];W[rh];B[rk];W[si];B[nh]C[White is sealed in.])
)
)

(;W[of]C[White 8 is a mistake.];B[pg]
C[White has lost the connection under at 'a', and is at a loss
for a good move. A White push at 'b' and Black replies with 'c',
increasing White's loss.]
LB[ph:c][og:b][mc:a])
)

(;B[pc];W[ob];B[mf];W[lc];B[of]C[
* GOOD VARIATION *])

(;B[mb]C['A' or 'B'.]LB[of:B][me:A]
(;W[me];B[nd];W[pe];B[qe];W[qc];B[pd];W[od];B[pc];W[pb];B[qb];W[nb];
B[pa];W[ob];B[qg];W[mc])

(;W[of];B[pg];W[og];B[ph];W[lc];B[mc];W[le];B[pc];W[pd];B[pb];W[ob];
B[jc];W[kc];B[jb];W[kb])
)

(;B[mc];W[of];B[pg];W[lf])
)

(;W[ph]C[Black continues with 'a' or 'b'. Black 'a' is better.]
LB[pg:b][of:a]
(;B[of];W[ne]C['A' and 'B' have the same result.]LB[ng:B][pc:A]
(;B[pc];W[ob];B[ng];W[me]
C[Next, Black can play at 'a', 'b' or 'c'. 'c' leads to immediate
fighting.]
LB[kd:c][pk:b][oi:a])

(;B[ng]C['A' or 'B'.]LB[qc:B][me:A]
(;W[me];B[pc];W[ob])

(;W[qc]C['A' or 'B'.]LB[pd:B][rc:A]
(;B[rc]LB[qb:A][pd:B]
C['A' gives some points.
After 'A' there's aji inside Black, after 'B' it's inside White.
]
(;W[qb];B[pd];W[nc];B[pj]LB[kd:A][re:B]
C['A' settles the position, 'B' starts a fight.
]
(;W[kd])

(;W[re];B[rd];W[rg];AW[qo][dp][pq]AB[cd][jq]
C[The continuation shows in reversed color and twice mirrored, how the groups ran out in the first game of the 6th Meijin, Cho Chikun 9P - Kato Masao 9P, Sep 9th-10th, 1891.
]
;B[qf];W[oi];B[ri];W[qh];B[rh];W[qg];B[mc];W[me];B[mh];W[nf];B[oh];
W[pi];B[le];W[lf];B[ke];W[kf];B[je];W[kh];B[ki];W[ji];B[kj];W[qj];
B[qk];W[pk];B[oj];W[rk];B[ql];W[rj];B[ni];W[pl];B[pm];W[nj];B[ok];
W[ol];B[nk];W[om];B[jf];W[jg];B[lg];W[kg];B[mk];W[hg];B[hf];W[gg];
B[gf])
)

(;W[pd];B[qe];W[qb];B[pj];W[kd])
)

(;B[pd];W[pc];B[me];W[nc];B[nf];W[lc];B[pk])
)
)
)

(;B[pg];W[oh];B[nf];W[qc];B[rc];W[ne]
C[Black continues with 'a'. Black 'b' is unreasonable.]LB[me:b][ng:a]
(;B[ng];W[me];B[pc];W[ob])

(;B[me]C[Black 13 is unreasonable.];W[of];B[og];W[ng];B[mf];W[qe]
C[Black cannot save his three stones.])
)
)

(;W[me];B[le];W[mf]
C['A' emphasizes the top side and corner, 'B' the right side.]
LB[pc:B][kd:A]
(;B[kd];W[ph];B[of];W[nd];B[mc];W[nh];B[qb];W[lh])

(;B[pc];W[ob];B[ld];W[ph];B[of];W[nd];B[oh])
)

(;W[qc];B[pd];W[pc];B[od];W[nd]C['A' is correct, 'B' is a mistake.]
LB[ne:B][nc:A]
(;B[nc];W[ne];B[nb];W[rd];B[re];W[rc];B[qg];W[ob];B[lc])

(;B[ne];W[nc];B[nf];W[lc])
)
)

(;W[ne]
C[Black continues with 'a *' to 'c'. 

Black 'd' is not recommended, but may work depending upon surrounding
conditions.]
LB[me:d][pe:c][qg:b][pf:a]
(;B[pf]C[White continues with 'a', 'b *' or 'c'.]LB[ld:c][qc:b][me:a]
(;W[me]C['A' leaves more aji than 'B'.]LB[pc:B][kd:A]
(;B[kd];W[mc])

(;B[pc];W[od];B[ph];W[jd])
)

(;W[qc]C[Black continues with 'a *' or 'b'.]LB[pd:b][rc:a]
(;B[rc];W[pd];B[qe]C[White continues with 'a *' or 'b'.]LB[me:b][qb:a]
(;W[qb]
C[Black continues by making an extension such as 'a *'. Black 'b'
is also possible depending upon circumstances.]
LB[me:b][qj:a]
(;B[qj]C[
* GOOD VARIATION *];W[dp]C[White plays elsewhere.];B[me];
W[og];B[pg];W[oh];B[ph];W[oi])

(;B[me];W[of];B[og];W[pe];B[nf];W[qf];B[oe];W[rf];B[qg];W[rg];B[qh];
W[rh];B[qi])
)

(;W[me])
)

(;B[pd];W[pc];B[nd];W[od];B[oe]
C[This is a strong way to play. 

Fujisawa Shuko = Fujisawa Hideyuki and Sakata Eio played this sequence often in their
Meijin tournament matches in the 1960's.]
;W[nf];B[nb]
C['A *' is correct. 'B' sacrifices a large corner for small influence.]
LB[pg:B][nc:A]
(;W[nc];B[mc];W[ob];B[ph]C['A' or 'B' are ok.]LB[kg:B][lf:A]
(;W[lf];B[jd];W[mi];B[mb]
C[Later, this is sente, White must not tenuki.];W[tt];B[rc]
C[Or Black kills.];W[rb];B[rd];W[sb];B[pa];W[oa];B[qb])

(;W[kg];B[ic];W[le];B[lb];W[rd];B[re];W[rc])
)

(;W[pg];B[rc];W[rb];B[rd];W[qf];B[ob])
)
)

(;W[ld]C['A' or 'B'.]LB[nd:B][pc:A]
(;B[pc];W[mc])

(;B[nd];W[od];B[me];W[of];B[pg];W[mb];B[lc];W[kc])
)
)

(;B[qg]
C[White continues with 'a' or 'b'. 

White 'a' gives White thickness, while Black gets a big corner;
the result favors Black slightly.

White 'b' emphasizes the top.

White 'c' has been seen in at least one professional game (Rin
Kaiho (B) vs. Fujisawa Shuko = Fujisawa Hideyuki (W) in the 4th Meijin league 1965--01-13).
The move may be considered an attempt to avoid the disadvantage
of White 'a'. White gets settled in the corner and Black on the
right side.]
LB[qc:c][me:b][pf:a]
(;W[pf];B[qf];W[qc];B[rc];W[pd];B[qb];W[qe];B[pc];W[rd];B[qc];W[rf];
B[od];W[pe];B[nd];W[qi]C[The result slightly favors Black.])

(;W[me]C['A' or 'B'.]LB[pc:B][kd:A]
(;B[kd];W[mc])

(;B[pc];W[ld])
)

(;W[qc];B[rc];W[pd]
C[Black continues with 'a'. Both sides get settled.

Black 'b' is a change in direction that render Black 3 and 5
superfluous.]
LB[qb:b][qe:a]
(;B[qe];W[qb])

(;B[qb];W[qe];B[pc];W[rd];B[qc];W[pe]
C[Black 3 and 5 has been rendered useless.])
)
)

(;B[pe];W[me]C[Black continues with 'a' or 'b'.]LB[ld:b][pc:a]
(;B[pc];W[ob];B[ph];W[ld])

(;B[ld]C['A' is correct, 'B' is a mistake.]LB[nd:B][le:A]
(;W[le]C['A' is correct, cutting on 'B' or 'C' is not good.]
LB[nd:C][od:B][kd:A]
(;B[kd];W[nd];B[gc];AW[dd]
C[If White is already here, he'lll press down the Black top group and then heavily attack Black on the right side.
]
;W[id];B[ic];W[hd];B[hc];W[jd];B[jc];W[ke];B[gd];W[qf]
C[This continuation was played by Yi Chang Ho against Mok Jin Seok.
])

(;B[od];W[nd];B[nc];W[mc];B[nb];W[mb];B[ob];W[kd];B[lc];W[lb])

(;B[nd];W[od];B[oe];W[kd];B[kc]LB[jc:A][lc:B]
C['A' takes an outside position, 'B' takes some stones.
]
(;W[jc]C['A', 'B' or 'C' don't help.]LB[ke:C][jd:B][lc:A]
(;B[lc];W[jd];B[mb];W[nb];B[nc];W[ob];B[kb];W[rc];B[qc];W[qb];B[pb];
W[pc];B[rb];W[pa];B[rd];W[ra];B[sc];W[na];B[qi];W[jb];B[la]
C[White's influence is superior.])

(;B[jd];W[ke];B[ic];W[jb];B[kb];W[id];B[je];W[ib];B[hc];W[lc];B[lb];
W[mb];B[mc];W[nc];B[lc];W[la])

(;B[ke];W[jd];B[lf];W[kf];B[je];W[lg];B[mf];W[nf];B[mg];W[ng];B[mh];
W[lc];B[mc];W[mb];B[lb];W[nc];B[lc];W[kb])
)

(;W[lc];B[jd];W[ke];B[lb];W[mc];B[mb];W[nc];B[ic]LB[qi:A][qb:B]
C[Black is happy to sacrifice, as his right side lives on A or B, which threatens a connection.
])
)
)

(;W[nd];B[le];W[lf];B[kf];W[kg];B[lg];W[mf];B[jf];W[lh];B[qh])
)
)

(;B[me];W[nf]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[mf:b][qg:a]
(;B[qg];W[mf];B[ke])

(;B[mf]C[Black 17 is a mistake.];W[qf];B[ng];W[pe])
)
)

(;W[qc]C[Black continues with 'a *' or 'b'.]LB[pd:b][rc:a]
(;B[rc]C[Joseki continues with 'a *'. White 'b' may be possible.]
LB[rb:b][pd:a]
(;W[pd]C['A *' is joseki, 'B' is a mistake.]LB[qb:B][qe:A]
(;B[qe];W[qb];B[pg]
C[Joseki continues with 'a *'. But White may play elsewhere ('b').]
LB[dp:b][rb:a]
(;W[rb];B[qk]C[
* GOOD VARIATION *])

(;W[tt]C[White plays elsewhere. Black continues with 'a' or 'b'.]
LB[nc:b][rb:a]
(;B[rb];W[mb])

(;B[nc];W[rb];B[ob];W[rd];B[re];W[sc]
C[Black can continue with 'a' or play elsewhere.]LB[od:a];B[od];W[pc];
B[pe])
)
)

(;B[qb];W[qe];B[pc];W[rd];B[qc];W[oe]
C[The triangled Black stone is now on a bad position.]TR[md])
)

(;W[rb]
C[White 6 was played by Fujisawa Shuko = Fujisawa Hideyuki against Wu Qingyuan = Go Seigen on July
3, 1964.]
;B[pc];W[qb];B[pd];W[rd];B[re];W[sc]
C[While Black cannot be disatisfied, White has life in the corner
and sente.])
)

(;B[pd];W[pc];B[od]
C[White continues with 'a' or 'b'. 'a' is preferable, but may lead
to complications.]
LB[nc:b][nd:a]
(;W[nd]C[Black continues with 'a' or 'b'.]LB[nc:b][ne:a]
(;B[ne]
C[Black 9 is somewhat passive, but Black gets excellent thickness
at the expense of giving White solid territory.]
;W[nc];B[me];W[lc];B[pj])

(;B[nc];W[ne]C[Black continues with 'a' or 'b'.]LB[mb:b][mc:a]
(;B[mc];W[rd];B[re];W[rc];B[pf];W[ng];B[ph])

(;B[mb];W[rd];B[re];W[rc];B[pf]
C[White continues with 'a' to live in the corner, or 'b' to exchange
the corner for center influence.]
LB[me:b][ob:a]
(;W[ob]C[White takes the corner.];B[me];W[nf];B[mf];W[ng];B[ph])

(;W[me]C[White chooses influence over territory.];B[ob];W[ld];B[pb];
W[mc];B[nb];W[lb];B[qb])
)
)
)

(;W[nc];B[nd];W[lc];B[pj])
)
)

(;W[mc]
C[Black continues with 'a' or 'b *'. Black 'b' involves a ladder.]
LB[lc:b][nd:a]
(;B[nd];W[nc];B[od]
C[White continues with 'a'. White 'b' and 'c' are inferior.]
LB[pc:c][ld:b][pd:a]
(;W[pd]C[Black continues with 'a'. Black 'b' is weak.]LB[pe:b][pc:a]
(;B[pc];W[pe];B[qc]
C[White continues with 'a' or 'b'. White 'b' is fierce.]LB[ld:b][lc:a]
(;W[lc];B[rf]
C[Joseki continues with 'a'. White 'b' was played by Fujisawa Shuko = Fujisawa Hideyuki
against Wu Qingyuan = Go Seigen in the 3rd Meijin League on July 3, 1964.]
LB[nf:b][pg:a]
(;W[pg];B[mf])

(;W[nf]AB[pq][co]AW[cc][po][dq]
C[White 'b' was played by Fujisawa Shuko = Fujisawa Hideyuki against Wu Qingyuan = Go Seigen in the
3rd Meijin League on July 3, 1964. The colors in the diagram
shown are reversed from the actual game.]
;B[ld];W[kd];B[mf];W[ng];B[kf];W[ke];B[le];W[jf];B[kg];W[pj];B[dd];
W[dc];B[ed];W[be];B[dg];W[ie];B[ec];W[fp];B[mp];W[hc];B[cf];W[ce];
B[de];W[bf];B[ch];W[cp];B[pm];W[qg];B[rg];W[do];B[nm];W[mj];B[mg];
W[qq];B[qr];W[rr];B[qp];W[rq];B[pp];W[pr];B[or];W[qs];B[nh];W[oh];
B[ni];W[nj];B[oi];W[pi];B[og];W[ph];B[of];W[oj];B[qk];W[rh];B[kj];
W[ml];B[dn];W[cn];B[cm];W[bo];B[bn];W[mm];B[nn];W[rp];B[qo];W[ip];
B[co];W[qf];B[qe];W[cn]C[White ending up winning by 2 points.])
)

(;W[ld]C[White 12 shows ferocity.];B[nf];W[qe];B[lc];W[lb];B[kc];W[kb]
;B[jc];W[pb];B[qb]
C[White continues with 'a' to make life. White 'b' is tough.]
LB[ob:b][jb:a]
(;W[jb];B[ic];W[ob];B[re];W[rf];B[se];W[pg];B[sb])

(;W[ob]
C[White 22 was played by Sakata Eio against Wu Qingyuan = Go Seigen in 1958.]
;B[re];W[rf];B[se];W[pg];B[jb]
C[Black 27 stops White from getting two eyes.];W[sc]
C[White 28 makes the corner a ko.])
)
)

(;B[pe]C[Black 9 is cowardly.];W[pc];B[qe];W[ld])
)

(;W[ld]C[White 8 gives Black the corner and solid shape.];B[pc];W[kc])

(;W[pc]
C[Black continues with 'a' to create a moyo to the right side.
Black 'b' is a deviation to build influence to the top side and
the center and should not be used if there isn't already a stone
on the top side which will become the extension from the Black
wall.]
LB[ld:b][pd:a]
(;B[pd];W[ld];B[le];W[ke];B[kd];W[lc];B[lf]
C['A' may be better than 'B'.]LB[je:B][qk:A]
(;W[qk])

(;W[je];B[pj])
)

(;B[ld];W[pd];B[pe];W[qe];B[qf];W[re];B[pf];W[rd];B[lc])
)
)

(;B[lc]C[Black 5 may involve a ladder.];W[ld]
C[Black continues with 'a *'.

Black 'b' yields significant influence, but White gets better
corner territory. Black must have the ladder to play 'b'.]
LB[kc:b][nc:a]
(;B[nc]C[Black must have the ladder to play this way.];W[mb];B[me]
C[White continues with 'a *'. White 'b' is a mistake.]LB[nb:b][nd:a]
(;W[nd]
C[Black changes direction and continues with 'a *'. Black 'b' is
bad.]
LB[kd:b][ne:a]
(;B[ne];W[nb];B[pe];W[kd];B[qj]C[
* GOOD VARIATION *])

(;B[kd]C['A' or 'B'.]LB[lb:B][ne:A]
(;W[ne];B[lb]C['A' is correct, 'B' is bad.]LB[mf:B][nb:A]
(;W[nb];B[mf];W[qf]
C[Trying to make Black live in the corner on A or B will give White
great outside strength.]
LB[rf:B][pf:A])

(;W[mf];B[le];W[nb];B[pf])
)

(;W[lb];B[le];W[ne];B[kb];W[qf];B[pf];W[pe];B[qe];W[qg];B[pb];W[og])
)
)

(;W[nb]C[White 10 is a mistake.];B[kd];W[pe];B[qe];W[pf];B[qg])
)

(;B[kc]
C[Black 7 gives White superior profit in the corner.

White continues with 'a'. White 'b' is an old pattern that isn't
necessarily favorable.]
LB[qe:b][pe:a]
(;W[pe]C[Black continues with 'a'. Black 'b' is unreasonable.]
LB[qe:b][me:a]
(;B[me];W[qe];B[nc];W[ob];B[nb];W[nd];B[mb];W[qg])

(;B[qe]C[Black 9 is unreasonably greedy.];W[me];B[nd];W[ne]
C[Black may try 'a' or 'b'.]LB[nc:b][od:a]
(;B[od];W[pd];B[nc];W[nb];B[mb];W[oe];B[mc];W[qf])

(;B[nc];W[od];B[nb];W[ob];B[mb];W[qg])
)
)

(;W[qe]C[Black continues with 'a'. Black 'b' is not as favorable.]
LB[pd:b][pe:a]
(;B[pe];W[pd];B[qf];W[re];B[rf])

(;B[pd]C[This is an old pattern, but not favorable for Black.];W[me];
B[nd];W[od];B[ne];W[oe];B[nf];W[pe])
)
)
)
)

(;W[pe]
C[White 4 is a trick play, not joseki.

Black continues with 'a'. Black 'b' is a mistake.]
LB[qe:b][pd:a]
(;B[pd];W[od];B[oe]
C[White continues with 'a'. White 'b' is disadvantageous.]
LB[ne:b][pf:a]
(;W[pf];B[of];W[pg]
C[Black continues with 'A' to a favorable ko.

Black 'B' is inferior., gives a seki]
LB[pb:B][og:A]
(;B[og]
C[White may continue wth 'a', 'b' or 'c', neither giving a favorable
result.]
LB[ph:c][qb:b][re:a]
(;W[re];B[pb];W[pc];B[qc];W[ob];B[qb];W[mb];B[rd];W[kc];B[ph];W[qh];
B[qi];W[pi];B[oh];W[ri];B[qg];W[qj];B[rg])

(;W[qb];B[ph];W[rf];B[re];W[qh];B[qi];W[pi];B[oh]
C['A' is correct, 'B' is a mistake.]LB[ri:B][rh:A]
(;W[rh];B[ri];W[qj];B[rj];W[rk];B[pj];W[si];B[qk];W[sj];B[oi];W[rl];
B[pb];W[pc];B[qc]C[White may try 'a' or 'b', neither successful.]
LB[rb:b][ob:a]
(;W[ob];B[rb];W[pa];B[ra])

(;W[rb];B[ob])
)

(;W[ri];B[qg];W[qj];B[qf])
)

(;W[ph];B[pb];W[ob];B[mb];W[pc];B[qc];W[qb];B[rb];W[pa];B[ra];W[re];
B[rc]C['A' is correct, 'B' doesn't work.]LB[ne:B][qe:A]
(;W[qe];B[nd];W[rd];B[nb];W[sc];B[na];W[oa];B[qa];W[sb];B[pb])

(;W[ne];B[nd])
)
)

(;B[pb];W[ob];B[mb];W[pc];B[qc];W[qb];B[rb];W[pa];B[ra];W[re]
C[Black must continue with 'A'. The corner becomes a seki.

Neither Black 'B' nor 'C' work. Black 'C' is worse, as White
may mistake if Black plays 'B'.

c3, b2, a1]
LB[qa:C][rc:B][nd:A]
(;B[nd];W[rc];B[rd];W[sd];B[sc];W[se];B[na];W[qe];B[rc];W[oa];B[nb];
W[sb]C[And the corner is a seki.];B[nc];W[og];B[mf])

(;B[rc]C[White 'A' is correct.
White 'B' is a mistake.]LB[qe:B][ne:A]
(;W[ne];B[nf];W[mc];B[lc];W[me];B[nd];W[le];B[nh];W[ld];B[nc];W[nb];
B[mc];W[na];B[qa];W[kc];B[kb];W[lb];B[la];W[ma])

(;W[qe];B[nd];W[rd];B[nb];W[sc];B[na];W[oa];B[qa];W[sb];B[pb])
)

(;B[qa]C[Black 21 is a mistake.];W[rd];B[rc];W[qe];B[nd];W[sc];B[nb];
W[sb];B[pb];W[oa];B[nc];W[qb])
)
)

(;W[ne]C[White 8 is a mistake.];B[of];W[nd];B[pf];W[mc])
)

(;B[qe]C[Black 5 is a mistake.];W[pf]
C['A' is usual, 'B' if there is an additional White stone on the
triangled position.]
;B[qg];W[qf];B[rf];W[rg];B[rh];W[pg];B[qh];W[re];B[sg];W[qc];B[rd];
W[jd])
)

(;W[tt]C[White plays elsewhere, not joseki.];B[od];W[pc];B[pd]
C['A' or 'B'.]LB[mc:B][nc:A]
(;W[nc];B[nd])

(;W[mc]C['A' or 'B'.]LB[nc:B][lc:A]
(;B[lc];W[nc];B[ld];W[qc]
C[If Black tenukis again, the hole in his wall will be used.]PL[2];
W[nd];B[ne];W[nf])

(;B[nc];W[nb];B[nd]
C['A' or 'B'. 'C' is ok with a stone in the top left corner.]
LB[lc:C][mb:B][lb:A]
(;W[lb];B[lc];W[mb];B[kc];W[qc])

(;W[mb];B[qb];W[jc])

(;AW[dd];W[lc];B[mb];W[ob];B[lb];W[kc];B[kb];W[jc];B[jb];W[ic];B[ib];
W[rc];B[hc];W[hd];B[gd];W[gc];B[hb];W[ie];B[ge];W[fc];B[hg];W[jg];
B[rd];W[rb];B[ma]C[White lives, Black kills on 'A'.]PL[2]LB[qc:A]
(;W[qc])

(;B[qc];W[qb];B[oa];W[sc];B[na];W[sa];B[qa])
)
)
)
)

(;W[qh]C['A' takes the corner, 'B' is also possible.]LB[qk:B][od:A]
(;B[od];W[qk];B[nc])

(;B[qk]C['A' or 'B'.]LB[oe:B][pe:A]
(;W[pe];B[qe];W[pf];B[qf];W[pg];B[qb]C[White weakness at A.]LB[od:A])

(;W[oe]C['A' is correct, 'B' can lead to difficulties.]LB[pf:B][qf:A]
(;B[qf];W[og];B[qb];W[oi])

(;B[pf]C['A' is correct, 'B' is disadvantageous.]LB[pe:B][me:A]
(;W[me]C['A' is correct, 'B' is disadvantageous.]LB[ld:B][pc:A]
(;B[pc];W[ob];B[ph];W[ld];B[pi])

(;B[ld];W[pe];B[qe];W[qf])
)

(;W[pe];B[qe];W[qf];B[of];W[rf];B[ne];W[pc];B[qc];W[qb];B[rb];W[pb]
C['A' is better than 'B'.]LB[re:B][sc:A]
(;B[sc]C['A' is correct, 'B' is disadvantageous.]LB[ra:B][mb:A]
(;W[mb]C['A' or 'B'.]LB[qa:B][oh:A]
(;B[oh];W[ra];B[qi];W[ri];B[ph];W[qj];B[qg];W[rh];B[pj];W[pi];B[oi];
W[rk];B[qi];W[rj];B[ql]C['A' and 'B' are miai.]LB[lb:B][rg:A]
(;W[rg];B[lb];W[nb];B[lc];W[oa];B[qa]
C['A' - > both life, 'B' -> seki or ko.]LB[sa:B][ma:A]
(;W[ma];B[sa])

(;W[pa];B[ma];W[re];B[rd];W[se])
)

(;W[lc];B[rg];W[sg];B[pg]C['A' is correct, 'B' is questionable.]
LB[re:B][rl:A]
(;W[rl];B[re];W[sf];B[se];W[sh];B[rd])

(;W[re];B[rd];W[sh];B[sf];W[se];B[sd];W[sf];B[rl];W[pd];B[sk])
)
)

(;B[qa];W[nf];B[oh];W[mf];B[oj];W[me];B[ri];W[ld];B[ph])
)

(;W[ra];B[nb];W[oh];B[pi];W[ph];B[ng])
)

(;B[re];W[ra];B[sc];W[mb];B[pi];W[ph];B[oh]
C[Neither 'A' nor 'B' give White a good result.]LB[rj:B][qi:A]
(;W[qi];B[oi];W[rk];B[rl];W[rj];B[qa];W[pa];B[kc];W[kb];B[jc];W[jb];
B[ic];W[ql];B[pl];W[qm];B[pm];W[rm];B[nb]
C[Later, Black can use the corner aji.];W[nc];B[lb]C['A' or 'B'.]
LB[mc:B][lc:A]
(;W[lc];B[mc];W[la];B[pd];W[od];B[sa];W[qa];B[na];W[ma];B[nd];W[sb])

(;W[mc];B[lc];W[la];B[ib])
)

(;W[rj];B[qi];W[ri];B[pg];W[qg];B[ng];W[sh];B[rk];W[sj];B[lb])
)
)
)
)
)
)

(;W[pd];B[qc];W[pf];B[qe];W[nf];B[qg];W[ld]C['A' or 'B'.]
LB[me:B][mc:A]
(;B[mc];W[me];B[lc];W[kd];B[kc];W[jd];B[ic];W[he])

(;B[me]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.]
;W[mb])
)
)

(;B[ld]
C[
Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia = 2-Space High Pincer
-----------------------------------------------------------------------------

The two-space high pincer is most common. This pincer typifies
modern Go, as it maintains balance between territory and influence,
offers a plethora of options, and has few weaknesses.

White responses range from 'a *', 'b *', 'c *', 'd *', 'e *',
'f *', 'g', 'h *', 'i *', 'j *', 'k *' or 'p'. White plays elsewhere
with 'l *'.
White 'm' shows White trying to live at top.

White 'n' is not joseki.

'o' is a big mistake.

m13, l12, k11, j10, i9, h8, g7, f6, e5, d4, c3, b2, a1
]
LB[jc:p][lc:o][ne:n][lb:m][dp:l][pg:k][qg:j][qf:i][md:h][me:g][oe:f][of:e][pe:d][pd:c][nd:b][qc:a]
(;W[qc]C[Black continues with 'a *'. Black 'b' is not good enough.
]
LB[pd:b][rc:a]
(;B[rc];W[pd]C[Black continues with 'a' or 'b *'.]LB[qb:b][qe:a]
(;B[qe];W[qb];B[pg])

(;B[qb]C[White continues with 'a *' or 'b'.]LB[pe:b][qe:a]
(;W[qe];B[pc];W[rd];B[qc]
C[Black 11 completes the "plum bowl" shape.

White continues with 'a *' or 'b'.]
LB[pe:b][oe:a]
(;W[oe]
C[Black should continue with 'a *'. Playing elsewhere with 'b'
results in a local loss. White 'c' is an overplay that may work.]
LB[pf:c][dp:b][ob:a]
(;B[ob];W[nc];B[mb]C[
* GOOD VARIATION *

The joseki ends.];W[nb]
C[White's later continuation.];B[na];W[mc];B[lc];W[lb];B[ma];W[kb];
B[jc])

(;B[tt]C[Black plays elsewhere; not recommended.];W[nb];B[re];W[rf];
B[sd];W[qf])

(;B[pf]C[White 13 is an overplay.];W[pe];B[nd]
C[White continues with 'a' or 'b'.]LB[ne:b][od:a]
(;W[od];B[ph]
C[With forcing moves at 'a' and 'b', White will have no trouble
settling himself.]
LB[rf:b][nb:a])

(;W[ne];B[nc]C['A' or 'B'.]LB[qi:B][me:A]
(;W[me];B[kc];W[pj]
C[White may hope for more from his moyo at right than Black's territory
at top. Black is left with a weak point at 'a' where White may
play in.]
LB[lb:a])

(;W[qi])
)
)
)

(;W[pe]C[White must have the ladder at 2 to play this way.];B[nc];
W[qi];B[ob])
)

(;W[pe]C[White needs a favorable ladder at 2 to play this way.];B[pc];
W[pb];B[qc];W[qf];B[nc];W[od];B[ob];W[me];B[mc])
)
)

(;B[pd]C[Black 5 is not recommended.];W[pc];B[od];W[nd];B[ne]
C[White continues with 'a', though White 'b' is possible with a
favorable ladder.]
LB[me:b][nc:a]
(;W[nc];B[me];W[qj])

(;W[me];B[nc];W[md];B[mc]
C[If the ladder off White 10 is favorable, White may play 'a'.
Otherwise 'b' is the only move left.]
LB[nf:b][lc:a]
(;W[lc];B[lb];W[kc];B[kd]
C[If the ladder off 'b' is not favorable to White, White collapses
as 'a' and 'b' are miai.]
LB[mf:b][jc:a])

(;W[nf];B[rc];W[rb];B[rd];W[nb];B[mb];W[na];B[kc]
C[White lives with 'a' as considerable disadvantage. White 'b'
and the corner can be killed through a ko.]
LB[pg:b][sb:a]
(;W[sb];B[qh])

(;W[pg]C[White risks the corner. Black must play 'a', not 'b'.]
LB[sb:b][ra:a]
(;B[ra];W[sb];B[pa];W[pb];B[ma];W[ob];B[qb]
C[While White captures first, Black has a ko threat at 'a'.]LB[mf:a])

(;B[sb]C[Black 23 is a mistake.];W[ra]C[White lives.])
)
)
)
)
)

(;W[nd]
C[Black continues with 'a *', 'b', 'c *', 'd' or 'e'.
Black 'd' can result in complications.
Black might have a reason for tenuki 'f'.
]
LB[pb:e][oe:d][pc:c][pg:b][pf:a][dp:f]
(;B[pf]
C[White continues with 'a *', 'b *' or 'c'. 'b' is the most usual.
White playing elsewhere ('d') is unthinkable.]
LB[dp:d][jc:c][qb:b][qc:a]
(;W[qc];B[rc];W[pd]
C[Black continues with 'a *'. Black 'b' is reckless.]LB[qb:b][qe:a]
(;B[qe];W[qb];B[qj]C[
* GOOD VARIATION *])

(;B[qb]C[Black 9 is a mistake.];W[qe];B[pc];W[rd];B[qc];W[pe])
)

(;W[qb];B[qj]
C[
* GOOD VARIATION *

White follows up with the jump to 'a' for influence, but a pincer
at 'b' or 'c' is usual. 'd' show variations when White plays
elsewhere.]
LB[dp:d][id:c][jc:b][nf:a]
(;W[nf]C[White aims for influence at a juncture point.]PL[2];W[pg]
C[If Black tenukis, White can make influence.];B[qg];W[qh];B[ph];W[og]
;B[rh];W[qf];B[rg];W[pe];B[rf])

(;W[jc])

(;W[id])

(;W[tt]C[White plays elsewhere.];B[mc]
C[White continues with 'a'. 'b' shows follow-up if White plays
elsewhere.]
LB[cq:b][rc:a]
(;W[rc];B[rd];W[nb];B[mb];W[oe])

(;W[tt]
C[White plays elsewhere. Black continues with 'a'. Black 'b' secures
the top side, but does much damage on the right side.]
LB[ob:b][pd:a]
(;B[pd]
C[Black 11 seems innocuous, but it is the vital point. White defends
with 'a'. White 'b' is not recommended.]
LB[rc:b][ob:a]
(;W[ob];B[rc])

(;W[rc]C[Black continues at 'a'. Black 'b' results in Black gote.]
LB[nc:b][ob:a]
(;B[ob]C[White continues with 'a'. White 'b' is out of the question.]
LB[pb:b][nb:a]
(;W[nb];B[nc];W[pb];B[od];W[oa])

(;W[pb]C[White 14 is a mistake.];B[nb])
)

(;B[nc]C[Black 13 results in Black gote, so is not good.];W[ob];B[od])
)
)

(;B[ob]C[Black 11 is premature.];W[nb];B[nc]
C[White continues with the tesjui of 'a'. White 'b' fails to punish
Black for the mistake of Black 11.]
LB[pb:b][pd:a]
(;W[pd]C[White 14 is the vital point for both players.];B[pb];W[pc];
B[mb];W[qe];B[qf];W[re])

(;W[pb]C[White 14 is a mistake. White fails to punish Black.];B[od];
W[pc];B[pd])
)
)
)
)

(;W[jc];B[ke];W[hd])

(;W[tt]C[White plays elsewhere, a huge mistake.];B[pc];W[nf];B[ph]
C[White is in trouble.])
)

(;B[pg]
C[White continues with 'a' to 'c'. White 'd' gives Black a favorable
result.]
LB[qc:d][jc:c][qi:b][qb:a]
(;W[qb]C[Black continues with 'a' or 'b'.]LB[mf:b][qk:a]
(;B[qk]
C[White can continue with a placement move at 'a', but this should
not be played too early in the game.]
LB[qf:a];W[qf]
C[Black can get thick with 'a' or sente with 'b' (with 'b', in
exchange for enlarging White's corner territory.]
LB[qg:b][pf:a]
(;B[pf];W[qe];B[pe];W[rd];B[pd];W[qc];B[qg])

(;B[qg];W[qe];B[of];W[pd])
)

(;B[mf]
C[Black 'b' shows a moyo strategy. White continues with 'a'. White
'b' is just what Black wants.]
LB[nf:b][qi:a];W[qi];B[pl];W[oi];B[oe])
)

(;W[qi]
C[Black continues with 'a' or 'b'. Black can get sente with 'a'.]
LB[pc:b][qb:a]
(;B[qb]C[White continues with 'a'. White 'b' is also possible.]
LB[jc:b][nf:a]
(;W[nf];B[oe];W[ne];B[oh];W[lf];B[id])

(;W[jc]AB[pq][cp][dq][eq]AW[dd][ep][fq][qo]
C[White 8 was played by Takagawa Shukaku against Rin Kaiho in the
8th Meijin Title (October 2 & 3, 1969), 5th Game.

Did this start a fight?]
;B[ke];W[lb];B[id];W[jd];B[je];W[ie];B[gd];W[if];B[ic];W[ib];B[hb];
W[jb];B[gf];W[fe];B[ge];W[ih];B[oe];W[ne];B[kh];W[ng];B[pi];W[pj];
B[oi];W[qh];B[og];W[lf];B[jg];W[ig];B[lg];W[mg];B[mh];W[nh];B[ni];
W[pl];B[mi];W[le];B[kd];W[mc];B[gh];W[ij];B[cf];W[fb];B[ef];W[ce];
B[bf];W[hc];B[hd];W[gc])
)

(;B[pc];W[pb];B[qb];W[pd];B[qc];W[pe];B[qf];W[nf])
)

(;W[jc]C[White 6 is possible with White support at top-left.];B[ke];
W[hd];B[qb];W[nf];B[oe];W[ne];B[kg];W[nh];B[pi])

(;W[qc]C[White 6 helps Black.];B[rc];W[pd];B[qe];W[qb];B[qk])
)

(;B[pc]C[White continues with 'a *' or 'b'.]LB[pe:b][pb:a]
(;W[pb];B[qb];W[pd];B[qc];W[pe];B[qf]
C[
* GOOD VARIATION *

White continues with 'a'. White 'b' and 'c' are not recommended.
White 'd' shows variations if White plays elsewhere.]
LB[dp:d][og:c][pf:b][pg:a]
(;W[pg];B[pf];W[of];B[qe];W[ng];B[oh];W[og];B[qh];W[ph];B[qi])

(;W[pf]C[White 12 lets Black stay ahead.];B[qg];W[pg];B[ph];W[oh];
B[oi];W[nh];B[pi])

(;W[og]C[White 12 is not recommended.];B[qg]
C[White has no good follow-up.])

(;W[tt]
C[White plays elsewhere. Black continues with 'a'. Black 'b' is
a not recommended.]
LB[pf:b][qg:a]
(;B[qg];W[nf])

(;B[pf]
C[Black 13 looks severe, but gives White a chance to make good
shape. Pushing moves like Black 13 are usually vulgar.]
;W[of];B[og];W[nf];B[ng];W[mf])
)
)

(;W[pe]
C[Black continues with 'a'. While odd shape, it is the vital point.

Black 'b' is a mistake.]
LB[qe:b][pd:a]
(;B[pd];W[qe]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[ob:b][od:a]
(;B[od];W[oe];B[nc];W[mc];B[ob]
C[White continues with 'a'. White 'b' is unreasonable.]LB[md:b][ne:a]
(;W[ne];B[mb];W[pj])

(;W[md]C[White 14 lets Black cut.];B[ne];W[me];B[nf];W[pg];B[mb];W[lc]
;B[mf];W[le];B[lf])
)

(;B[ob];W[oe];B[mc];W[pi];B[tt]C[Black plays elsewhere.];W[pb]
C[Black continues with 'a'. Black 'b' is less favorable.]
LB[nc:b][qb:a]
(;B[qb];W[nb];B[nc];W[oa];B[od];W[rd])

(;B[nc];W[rd]C[White sneaks into the corner.])
)
)

(;B[qe]C[Black 7 is a mistake.];W[pd];B[qc];W[pf];B[qg];W[id])
)
)

(;B[oe]
C[White continues with 'a'. White 'b' is not recommended.
'c' is bad if there is no White help on or near the triangled 
position.
The fourth continuation here is 'c' with help in the lower right 
corner in which case 'c' is better than 'a'!]
LB[ne:c][qc:b][pd:a]TR[po]
(;W[pd]C[Black continues with 'a' or 'b'.]LB[pe:b][qe:a]
(;B[qe]
C[White continues with 'a'. White 'b' gives Black a better result.]
LB[pe:b][qc:a]
(;W[qc]C[Black continues with 'a' or 'b'.]LB[pe:b][rc:a]
(;B[rc];W[pe]C[Black continues with 'a' or 'b'.]LB[pf:b][qf:a]
(;B[qf];W[pf];B[pg]
C[White continues with 'a' or 'b'. White 'c', playing elsewhere,
is not recommended.]
LB[dp:c][og:b][qb:a]
(;W[qb])

(;W[og];B[ph];W[qb])

(;W[tt]C[White plays elsewhere.];B[og];W[of]
C[White must play 16 or suffer greatly.];B[ng]C[The sequence ends.];
W[qg]C[White 18 is a mistake.];B[qh];W[rg];B[rf];W[rh];B[qi]
C[White continues with 'a'. White 'b' is a mistake.]LB[ri:b][sf:a]
(;W[sf]C[With White 24, White gets a ko.];B[se];W[rd];B[sg];W[sh];
B[ri];W[sf])

(;W[ri]C[White fills in his own liberties with 24.];B[rj];W[rd];B[sg]
C[White loses.])
)
)

(;B[pf]C[Black 11 leads to difficult variations.];W[qf]
C[Black continues with 'a' or 'b'.]LB[rf:b][qb:a]
(;B[qb];W[pc];B[re];W[rf];B[se];W[qh]
C[Black continues with 'a'. Black 'b' is a trick play that White
can outplay.]
LB[me:b][mf:a]
(;B[mf]C[White continues at 'a'. White 'b' is a mistake.]
LB[of:b][nf:a]
(;W[nf]
C[White 20 is a tesuji. 

Black continues with 'a' or 'b'. Black 'c' is a mistake.]
LB[ng:c][ph:b][pg:a]
(;B[pg]C[White continues with 'a' or 'b'.]LB[me:b][ne:a]
(;W[ne];B[ph];W[qi];B[pi];W[qj];B[mg];W[lc];B[kc]
C[White continues with 'a' or 'b'.]LB[ng:b][lb:a]
(;W[lb];B[kd])

(;W[ng])
)

(;W[me]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[le:b][ph:a]
(;B[ph]C[White continues with 'a'. White 'b' is a mistake.]
LB[qi:b][le:a]
(;W[le];B[qi];W[kd])

(;W[qi]C[White 24 is an overplay.];B[le];W[pi];B[ng])
)

(;B[le];W[ph];B[ng];W[mg];B[lf];W[og];B[of];W[nh];B[ne];W[md];B[ng];
W[rb];B[oh];W[sb];B[oi]
C[White must continue with 'a'. Playing elsewhere ('b') is a mistake.]
LB[dp:b][qj:a]
(;W[qj];B[pj]C[White must continue with 'a'. White 'b' is a mistake.]
LB[qk:b][ri:a]
(;W[ri])

(;W[qk]C[White 40 is a mistake.];B[ri];W[rh];B[qi];W[pi];B[sh]
C[White 'a', 'b', and 'c' all fail.]LB[sg:c][rg:b][rj:a]
(;W[rj];B[rg])

(;W[rg];B[sg])

(;W[sg];B[qg])
)
)

(;W[tt]C[White cannot afford to play elsewhere.];B[qg];W[rg];B[ri];
W[rh];B[qi];W[sf];B[pi];W[sd])
)
)
)

(;B[ph]C[White continues with 'a'. White 'b' is a mistake.]
LB[pg:b][me:a]
(;W[me];B[pg];W[le];B[qi];W[kd])

(;W[pg]C[White 22 is a mistake, as it plays into Black's hands.];B[of]
;W[og];B[ne];W[me];B[ng]C[White has no good follow-up.])
)

(;B[ng]C[Black 21 is a mistake.];W[og];B[of];W[ne];B[pg];W[oh];B[ph];
W[pi];B[oi];W[nh];B[qi];W[pj];B[qg];W[mg])
)

(;W[of]C[White 20 is a mistake.];B[pg]
C[White may try 'a' or 'b'. Neither work.]LB[nf:b][ne:a]
(;W[ne];B[ph];W[qi];B[nf];W[og];B[nh])

(;W[nf];B[ph];W[qi];B[mg])
)
)

(;B[me]
C[White 19 is a trick play. White continues with 'a'. White 'b'
and 'c' don't work.]
LB[ne:c][of:b][nf:a]
(;W[nf];B[ne];W[of];B[pg];W[oh])

(;W[of]C[White 20 is a mistake.];B[pg];W[ne];B[ph];W[qi];B[pi];W[qj];
B[nf];W[og];B[ng];W[oh];B[ni])

(;W[ne]C[White 20 is ridiculous.];B[nf])
)
)

(;B[rf];W[qg];B[pg];W[qh];B[ph];W[qi]
C[Black continues with 'a' or 'b'.]LB[pi:b][qb:a]
(;B[qb];W[pc];B[rb]
C[White continues with 'a'. White 'b' is not generally recommended.]
LB[me:b][pi:a]
(;W[pi];B[mf];W[lb];B[kb];W[kc];B[lc];W[jb];B[mb];W[ka];B[mc];W[kd];
B[le];W[jf])

(;W[me]
C[White 22 is not recommended, as Black gets the vital point at
'a'.]
LB[pi:a];B[pi];W[qj];B[ok])
)

(;B[pi];W[rb]C[Black continues with 'a'. Black 'b' is a mistake..]
LB[qj:b][qb:a]
(;B[qb];W[pc];B[re]
C[White continues with 'a'. White 'b' is small and greedy.]
LB[sc:b][qj:a]
(;W[qj];B[sb];W[pj];B[mf];W[lb])

(;W[sc]C[White 24 is a mistake.];B[qj];W[rj];B[rk]
C[White cannot avoid a ko at 'a'.]LB[sd:a])
)

(;B[qj];W[sd];B[re];W[rg];B[qb];W[pc]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[rd:b][sb:a]
(;B[sb];W[rd];B[ra];W[sf]C[White can now aim at the cut at 'a'.]
LB[pj:a])

(;B[rd]C[Black 27 is a mistake.];W[sc];B[ra];W[sb])
)
)
)
)
)

(;B[pe];W[rc];B[ne]C[This result favors White slightly.])
)

(;W[pe];B[pf];W[qc];B[qg];W[rf];B[qf];W[rc];B[ne]
C[This result slightly favors Black.])
)

(;B[pe]C[White continues with 'a'. White 'b' is unreasonable.]
LB[qe:b][qc:a]
(;W[qc]C[Black continues with 'a' or 'b'.]LB[rc:b][re:a]
(;B[re]C[White continues with 'a' or 'b'.]LB[ne:b][rc:a]
(;W[rc];B[ne]
C[Black builds thickness when it works well, as White has considerable
corner profit.])

(;W[ne]
C[White gets out to the center, but at a cost. Black continues
with 'a' or 'b'.]
LB[rc:b][nf:a]
(;B[nf];W[mf];B[ng];W[le];B[rc];W[kd])

(;B[rc];W[ng];B[id]
C[White should not peep at 'a', as Black will play 'b' and White
is in gote.]
LB[od:b][qf:a])
)
)

(;B[rc]
C[Kajiwara Takeo 9-dan invented Black 9, an uncompromising move.];
W[rd];B[qe]C[White continues with 'a'. White 'b' is a mistake.]
LB[re:b][rb:a]
(;W[rb];B[od];W[pc];B[re];W[ne];B[nf];W[mf];B[ng];W[le];B[mg];W[ke])

(;W[re]C[White 12 is a mistake.];B[qb];W[pc];B[sb]
C[White continues with 'a'. White 'b' doesn't work, as Black captures
the two White stones.]
LB[ra:b][qf:a]
(;W[qf];B[ra])

(;W[ra]C[White 16 is a mistake.];B[rf])
)
)
)

(;W[qe]C[White 8 gives Black superior thickness at best.];B[qf];W[re];
B[qc];W[rf];B[ne];W[pc];B[qb]
C[White continues with 'a'. White 'b' is a mistake.]LB[qg:b][pb:a]
(;W[pb];B[qg];W[rg];B[qh];W[rd];B[md]C[Black 'a' later is sente.]
LB[nb:a])

(;W[qg]C[White 16 is a mistake.];B[nb]
C[Neither White 'a' nor 'b' work.]LB[mc:b][nc:a]
(;W[nc];B[mb];W[pb];B[pa]C[White loses the fight by one move.])

(;W[mc];B[lc];W[mb];B[lb];W[pb];B[pa];W[oa];B[qa];W[la]
C[Black continues with 'a'. Black 'b' gives White a ko.]LB[ka:b][na:a]
(;B[na];W[ma];B[jb])

(;B[ka]C[A ko fight ensues.];W[na])
)
)
)
)
)

(;W[qc]C[White 6 is a mistake in order. Black gains advantage.];B[rc];
W[pd];B[qb];W[pe];B[pc];W[pb];B[qc];W[of];B[qf];W[pf];B[qg])

(;W[ne]
C[White 6 is ridiculous only if there is no White help on or near 
the triangled position.]
TR[po];B[of]C[White 'a' is worse than White 'b'.]LB[pd:b][nf:a]
(;W[nf];B[og]C[White continues with 'a' or 'b'. White 'c' is bad.]
LB[qc:c][pd:b][lf:a]
(;W[lf];B[id])

(;W[pd];B[qe];W[qc];B[rc];W[qb]
C[White cannot continue at 'a' because of Black 'b'.]LB[mc:b][lb:a])

(;W[qc]C[White 10 compounds the original mistake.];B[rc];W[pd];B[qb]
C[White may try 'a' or 'b'.]LB[pe:b][qe:a]
(;W[qe];B[pc])

(;W[pe];B[pc];W[od];B[qf])
)
)

(;W[pd];B[qe];W[qc];B[rc];W[qb];B[qh]
C[Black still has the eye stealing move at 'a'.]LB[mc:a])
)

(;AW[po][pq]PL[2];W[ne];B[of];W[nf];B[og];W[id];B[lf];W[ke];B[le];
W[ng];B[oh];W[nh];B[oi];W[lh];B[kf];W[if];B[jg];W[qk]
C[White has been pushed Black on the fifth line which is in most 
cases very bad. But not here, because of two reasons: 
1. A Black group is on the run, and White will profit a lot from 
that in the middle game by harassing the group.
2. The White stone on or near the triangled position allowed 
White to play White 22, which is strongly reducing the Black 
fifth-line-territory enlarging White's right side territory.]
LB[qk:22]TR[po])
)

(;B[pb]C[Black 5 is a recent innovation credited to Cho Chikun.];W[qc]
;B[pc];W[pd];B[pe];W[od];B[rc];W[qe];B[rd]
C[White continues with 'a'. White 'b' is a mistake, even if the
ladder works.]
LB[pf:b][ob:a]
(;W[ob];B[qf];W[qb];B[rb];W[pa]
C[Black 3, now weakened, has lost much of its original meaning.]TR[ld])

(;W[pf]C[White 14 is a mistake.];B[ob]
C[White now faces the prospect of Black connecting to the pincer
stone (Black 3) by playing 'a'.]
LB[mc:a])
)

(;B[tt]LB[qb:A][qf:B]
C['A' is usual, but with much influence over the top side, White will start an attack on 'B'.
]
(;W[qb])

(;AW[fc][fe][fg];W[qf];B[pe];W[nf];B[pf];W[pg];B[og];W[of];B[qg];W[ph]
;B[rg];W[nh];B[id];W[lb])
)
)

(;W[pd]
C[This play has lost popularity, as the pincer is well placed to
counter White 4. 
'A *' and 'B *' are joseki. 'A' is easy, 'B' leads to more complicated
variations.]
LB[qc:B][qe:A]
(;B[qe];W[qc];B[rc];W[qb];B[pg]C[
* GOOD VARIATION *])

(;B[qc]
C[White continues with 'a *' (joseki). White 'b' leads to a local
loss.]
LB[pf:b][qe:a]
(;W[qe]C[Black continues with 'a *'. Black 'b' is weak.]LB[re:b][pe:a]
(;B[pe];W[re]
C[Black continues with 'a *' to 'c'. Black 'a' is severe. Black
'b' gives an equal result, allowing White to settle his stones.
Black 'c' relies on Black playing the 2-2 point in the corner
to live.]
LB[pf:c][nd:b][oe:a]
(;B[oe]C[White continues with 'a *' or 'b'.]LB[qb:b][pc:a]
(;W[pc];B[qb]C[White continues with 'a *'. White 'b' is a mistake.]
LB[mc:b][rd:a]
(;W[rd]C[Black 'A *' is joseki, 'B' is another variation.]
LB[nb:B][nc:A]
(;B[nc]
C[White continues with 'a *' if the ladder is unfavorable. White
can only play 'b' if the ladder favors White.]
LB[pb:b][nb:a]
(;W[nb]
C[Black continues with 'a *' or 'b'. Black 'a' is a simple, older
joseki.]
LB[mb:b][mc:a]
(;B[mc]C['A *' is joseki, 'B' an older variation.]LB[pb:B][mb:A]
(;W[mb];B[lb];W[pb]
C[
* GOOD VARIATION *

Later, Black has a continuation on 'A'.]
LB[oa:A])

(;W[pb];B[mb];W[rb])
)

(;B[mb]
C[White continues with 'a', or if the ladder is favorable, 'b'.]
LB[nd:b][ob:a]
(;W[ob];B[rc];W[sb];B[nd];W[sc];B[qf];W[rf];B[qg];W[rg];B[qh])

(;W[nd];B[mc];W[ne];B[nf];W[od]
C[Black plays 'A' if White has the ladder, but destroys White on
'B', if White doesn't have the ladder.]
LB[me:B][og:A]
(;B[og];W[me];B[lf]C[White continues with 'a'. White 'b' is reckless.]
LB[le:b][pb:a]
(;W[pb];B[le])

(;W[le]C[Black 24 is a mistake.];B[ke];W[kd];B[mf];W[lc];B[ob];W[pb];
B[na];W[md];B[pa];W[ld];B[jd]C[White has lost.])
)

(;B[me];W[of];B[pf];W[og];B[pg];W[ph];B[qg];W[oh];B[md]
C[White 16 is possible, if White has the ladder starting on 'A'.]
LB[nd:16][mf:A])
)
)
)

(;W[pb]C[Black continues with 'a' or the unusual move of 'b'.]
LB[oa:b][nb:a]
(;B[nb];W[rb];B[od];W[rc])

(;B[oa]
C[Black 15 is an exquisite tesuji discovered by Suichi Masao 9-dan
in 1959.

The ladder is important.]
;W[nb];B[mb]
C[White must play 'a' if the ladder is unfavorable, but can play
'b' if the ladder is favorable.]
LB[nd:b][ob:a]
(;W[ob];B[ma];W[mc];B[nd];W[lb];B[lc];W[rb])

(;W[nd]C[White must have the ladder to play White 18.];B[mc];W[ne];
B[nf];W[od]
C[Black continues with 'a'. If Black 'b' or 'c', White 'd' and
White wins the capture race.]
LB[rb:d][of:c][mf:b][me:a];B[me]
C[White 'a' does not work. White 'b' leads to ko if White has the
ladder.]
LB[of:b][rb:a]
(;W[rb]C[White 24 is a mistake.];B[pa];W[rc];B[qa])

(;W[of];B[pf];W[og];B[pg];W[ph];B[qg];W[oh]
C[Black plays 'a' if Black 21 cannot be captured in a ladder, and
Black 'b' if Black 21 can be captured in a ladder.]
LB[mf:b][md:a]
(;B[md]
C[If the ladder created by White 'a' is unfavorable, White loses.]
LB[mf:a])

(;B[mf]
C[Black must play 31 if Black 21 can be captured in a ladder by
White.]
;W[rg];B[qh];W[qi];B[rh];W[ri];B[rf];W[sh];B[sg];W[si];B[qf];W[sf];
B[se];W[sd])
)
)
)
)
)

(;B[nb];W[nc];B[mc];W[pb];B[nd];W[rb])
)

(;W[mc]C[White 12 is a mistake.];B[qf];W[rf]
C[Black continues at 'a'. Black 'b' is a mistake.]LB[nd:b][qg:a]
(;B[qg];W[rg];B[rh];W[qh];B[ph];W[qi];B[ri];W[rj];B[qj];W[pi];B[rk];
W[pj];B[qk];W[pf];B[pg];W[of];B[nf];W[og];B[oh];W[ng];B[nh];W[mg]
C[White cannot play at 'a' because of Black 'b', so White is lost.]
LB[oj:b][mi:a])

(;B[nd]C[Black 15 is a mistake.];W[pb];B[rd];W[qg];B[nc];W[nb];B[lb];
W[mb];B[lc];W[pa];B[qa];W[sd];B[sc];W[rb];B[ra];W[sb];B[se];W[sf]
C[The result is ko.])
)
)

(;W[qb]
C[White 10 captures the corner. 'A' is correct, 'B' is a mistake.]
LB[pc:B][pb:A]
(;B[pb];W[pc];B[rb];W[qa]C['A' is better than 'B'.]LB[pa:B][nc:A]
(;B[nc];W[ob])

(;B[ra];W[rc];B[pa];W[qb];B[qa];W[rd];B[qb];W[ob])
)

(;B[pc];W[pb];B[od];W[rc]
C[Black continues with 'a' or 'b'. Black 'a' gives Black sente,
while Black ends in gote with 'b'. Black loses about 20 points
in the corner for the sente.]
LB[rd:b][nc:a]
(;B[nc];W[ob];B[ph];W[rd]C[Black plays elsewhere in sente.])

(;B[rd];W[sd];B[pd];W[qg];B[rb];W[sc];B[ob];W[ra];B[nc])
)
)
)

(;B[nd];W[qb]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[pb:b][pc:a]
(;B[pc];W[od];B[pb]
C[White continues with 'a'. White 'b' is a mistake.]LB[ob:b][of:a]
(;W[of];B[pf];W[pg];B[qf];W[qg];B[rf];W[rg];B[rd];W[oe];B[se];W[nh])

(;W[ob]C[White 14 is a mistake.];B[oe];W[rc];B[rb];W[rd];B[qa];W[oa];
B[pa];W[sb];B[nc];W[ra]C[White must play ko, but...];B[sa]
C[White has no ko threats.])
)

(;B[pb]C[Black 11 is a mistake.];W[pc];B[rb];W[qa];B[ra];W[rc];B[pa];
W[qb];B[qa];W[rd];B[qb];W[ob])
)

(;B[pf]
C[White continues with 'a'. White 'b' and 'c' are questionable.]
LB[rd:c][pc:b][qg:a]
(;W[qg];B[pg];W[qh];B[nd]
C[White continues with 'a'. White 'b' is a mistake. White 'c' gives
White a low position.]
LB[qb:c][pc:b][od:a]
(;W[od];B[oe];W[pb];B[qb];W[nb]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[mc:b][mb:a]
(;B[mb];W[mc];B[lb];W[md];B[me];W[lc];B[kc];W[nc];B[le];W[ne];B[nf];
W[kb];B[jb];W[rd];B[oa];W[pa];B[qa];W[rc];B[pc];W[ob];B[nd];W[na]
C[White wins, but Black 'a' remains as sente.]LB[ka:a])

(;B[mc]C[Black 19 is a mistake.];W[mb];B[lb];W[rd];B[rc];W[sb]
C[White wins the capturing race and can later peep at 'a'.]LB[kc:a])
)

(;W[pc]C[White 14 is a mistake.];B[qb]
C[White 'a' is better than White 'b'.]LB[pb:b][mb:a]
(;W[mb];B[mc];W[pb]
C[Black continues at 'a'. Black 'b' and Black loses.]LB[nb:b][oa:a]
(;B[oa]C[Black 19 is the tesuji.];W[nb];B[lb];W[pa];B[qa]
C[Neither White 'a' nor 'b' work.]LB[od:b][rd:a]
(;W[rd];B[nc];W[la];B[ka];W[na]
C[White starts a multi-step ko that does not work.])

(;W[nc];B[od])
)

(;B[nb]C[Black 19 is a mistake.];W[ra]
C[White 20 is the tesuji; Black loses.])
)

(;W[pb];B[nc])
)

(;W[qb];B[pc]C[White continues with 'a'. White 'b' is a mistake.]
LB[od:b][pb:a]
(;W[pb];B[od];W[rc];B[ob];W[rd];B[nc])

(;W[od]C[White 16 is a mistake.];B[pb];W[ob];B[rb];W[oe]
C[Black continues at 'a' or 'b'. White has a heavy eyeless group
to contend with.]
LB[nf:b][ph:a]
(;B[ph])

(;B[nf])
)
)
)

(;W[pc];B[rb];W[rd];B[rc]
C[White continues with 'a'. White 'b' is a mistake.]LB[pb:b][qg:a]
(;W[qg];B[pb];W[ob];B[pa]
C[White minimizes dmaage by giving up the four stones and playing
'a'. White 'b' looks good, but doesn't work.]
LB[nd:b][pg:a]
(;W[pg]C[White 18 is the best move.];B[ne];W[og];B[nf];W[kc];B[lc];
W[lb]
C[Black continues with 'a' or 'b', depending on strategic considerations.
Black 'a' captures the four White stones, while Black 'b' let's
White live while giving Black thickness.]
LB[kd:b][mb:a]
(;B[mb];W[kb];B[ma];W[kd]
C[White 28 is sente. Black must respond to solidify his shape.])

(;B[kd];W[kb];B[jc];W[jb];B[ic];W[mc];B[md];W[nc]
C[White lives, but Black has thickness.])
)

(;W[nd]C[White 18 is a mistake.];B[ne];W[md];B[me];W[lc];B[kc];W[kb];
B[kd];W[jb];B[qi]
C[The cutting point of 'a' makes Black 'b sente, so Black can play
the attack at 27.]
LB[oe:b][mc:a])
)

(;W[pb]C[White 14 is a mistake.];B[qf])
)

(;W[rd]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[pc:b][rc:a]
(;B[rc];W[pc]C[Black continues with 'a'. White 'b' is a mistake.]
LB[qf:b][rb:a]
(;B[rb]
C[This position is the same as White 12, Black 13 played before 
White 10, Black 11, see there for continuations.]
LB[rb:13][rc:11][rd:10][pc:12])

(;B[qf];W[rb]C[Black can now be captured.])
)

(;B[pc]C[Black 11 is a mistake.];W[od];B[ob];W[nb];B[pb];W[mc];B[qf];
W[rc];B[rb];W[sb];B[qa];W[rf];B[rg];W[ra]
C[Usually this would be unreasonable for White, except that in
this circumstance White has the ko threat of 'a'.]
LB[qg:a])
)
)
)

(;B[re]C[Black crawls along the "line of defeat" (the second line).];
W[qf];B[rf];W[qg])
)

(;W[pf]C[White 6 results in a loss locally.];B[qe]
C[White 'a' is not very good, but White 'b' is unreasonable.]
LB[qf:b][nf:a]
(;W[nf];B[qg])

(;W[qf];B[pe];W[oe];B[of];W[ne];B[og]
C['a' and 'b' are miai for Black.]LB[qh:b][mf:a])
)
)
)

(;W[pe]C[Black continues with 'a *' or 'b'.]LB[qe:b][pd:a]
(;B[pd];W[od];B[oe]
C[White 'a *' is joseki. White 'b' and 'c' are unreasonable, as
Black lives in the corner and White is left with split groups.
White 'd' is a mistake.]
LB[ne:d][pf:c][qe:b][md:a]
(;W[md]C[Black continues with 'a *' to 'c'. Black 'd' is a mistake.]
LB[pf:d][ne:c][le:b][of:a]
(;B[of]C['A', 'B' or 'C'.]LB[le:C][me:B][lc:A]
(;W[lc];B[me];W[jc];B[qg])

(;W[me]
C[Black continues with 'A' or 'B *'. Playing elsewhere 'C' is a
mistake.]
LB[dp:C][qg:B][lc:A]
(;B[lc];W[le];B[ke];W[kf];B[je];W[qf])

(;B[qg]
C[White continues at 'a *'. White should not play elsewhere ('b').]
LB[dp:b][lc:a]
(;W[lc]C[
* GOOD VARIATION *])

(;W[tt]C[White plays elsewhere, a mistake.];B[lc]
C[White continues with 'a'. Playing elsewhere ('b') is a mistake.]
LB[cq:b][mc:a]
(;W[mc]C[Black continues at 'a'. Black 'b' and White settles himself.]
LB[ic:b][pb:a]
(;B[pb])

(;B[ic]C[Black 15 lets White settle himself in the corner.];W[qb])
)

(;W[tt]C[White plays elsewhere again, a mistake.];B[mc]
C[White is in serious trouble in this corner.])
)
)

(;B[tt]C[Black plays elsewhere.];W[re]
C[Black continues at 'a'. Black 'b' is a mistake.]LB[qe:b][qg:a]
(;B[qg]C[White continues at 'a', not 'b'.]LB[qe:b][rd:a]
(;W[rd];B[qe];W[qc])

(;W[qe]C[White 14 is a mistake.];B[rd])
)

(;B[qe]C[Black 13 is a mistake.];W[pf])
)
)

(;W[le]C['A' or 'B'.]LB[me:B][kd:A]
(;B[kd];W[ne];B[pf];W[ke];B[id];W[lb])

(;B[me];W[ne];B[mf];W[nf];B[ng];W[nd];B[mg];W[lc];B[kd];W[kc];B[jd];
W[jc];B[id];W[qe]C['A' or 'B'.]LB[rd:B][re:A]
(;B[re];W[og];B[pf];W[qf];B[pg];W[rf];B[rd];W[qh];B[pi];W[ph];B[oh];
W[qi];B[pb];W[pj];B[ob];W[ic];B[hd];W[gc];B[nb];W[mb])

(;B[rd];W[re]C['A' or 'B'.]LB[pg:B][qg:A]
(;B[qg];W[rg];B[pf];W[qf];B[se];W[rf];B[qh];W[rh];B[qi];W[pc];B[ri];
W[rc])

(;B[pg];W[rg];B[pc];W[ob];B[pb];W[qi];B[ic])
)
)
)
)

(;B[le];W[of];B[ne];W[me];B[nf];W[mf];B[ng];W[lc];B[pf];W[lf])

(;B[ne];W[me];B[pf]
C[White continues with 'a'. It is a serious mistake to play elsewhere
('b'). White 'c' is unreasonable.]
LB[nf:c][dp:b][lc:a]
(;W[lc]C[Black continues with 'a', or plays elsewhere 'b'.]
LB[dp:b][mf:a]
(;B[mf];W[lf];B[lg];W[kf];B[mg])

(;B[tt]C[Black plays elsewhere.];W[nf];B[of];W[ng];B[ph];W[ni])
)

(;W[tt]C[White plays elsewhere, a mistake.];B[mc]
C[White continues at 'a'. White 'b' is worse.]LB[lc:b][nd:a]
(;W[nd];B[jd])

(;W[lc];B[lb];W[kc];B[nd])
)

(;W[nf]C[White 12 is unreasonable.];B[mf]
C[Without the White stone at 'a', Black can cut.]LB[lc:a];W[of];B[qe];
W[nd];B[pe];W[lf];B[mg];W[le];B[nh]C[Black could also play at 'a'.]
LB[oh:a])
)

(;B[pf]C[Black 9 is a mistake, as it gives White good shape.];W[ne];
B[of];W[le])
)

(;W[qe]C[White 8 is unreasonable.];B[re]C[White can try 'a' or 'b'.]
LB[rd:b][rf:a]
(;W[rf];B[rd];W[pg];B[pc])

(;W[rd];B[rc];W[qc];B[sd];W[pc];B[rd];W[pg];B[ne]
C[White may try 'a' or 'b'.]LB[rb:b][qg:a]
(;W[qg];B[qb];W[pb];B[rb];W[lb];B[kb])

(;W[rb];B[qg];W[pf];B[ph])
)
)

(;W[pf]C[White 8 is unreasonable.];B[ne];W[qb];B[rf];W[qg];B[rb];W[pb]
;B[rg];W[qi];B[rc];W[lb];B[kb]
C[White tries to live with 'A' or 'B' or goes outside with 'C'.]
LB[kc:C][lc:B][nb:A]
(;W[nb];B[lc];W[mc];B[la];W[mb];B[jc])

(;W[lc]C['A' is usual, 'B' just gives White a cut outside.]
LB[nb:B][kc:A]
(;B[kc];W[nb];B[mc];W[mb];B[kd];W[la];B[og])

(;B[nb];W[nc];B[kc]C['A' is correct, 'B' fails to punish.]
LB[mb:B][md:A]
(;W[md];B[me];W[kd];B[le];W[mb];B[na];W[oa]C['A' or 'B' don't kill.]
LB[nd:B][qa:A]
(;B[qa];W[nd];B[la];W[ob];B[jd])

(;B[nd];W[qa];B[mc];W[ob];B[jd])
)

(;W[mb];B[na];W[oa];B[qa];W[md];B[me];W[nd];B[la];W[ob];B[ke])
)
)

(;W[kc];B[mb];W[lc];B[mc];W[kd];B[le])
)

(;W[ne]C[White 8 is a mistake.];B[of];W[md];B[le]
C[White continues with 'a' to settle himself. White 'b' is a mistake.]
LB[nf:b][lc:a]
(;W[lc])

(;W[nf]C[White 12 is a mistake.];B[og];W[ng];B[oh];W[id];B[lg]
C[After Black 17, White must play 'a', making matters worse.]LB[nh:a];
W[nh];B[oi])
)
)

(;B[qe]C[White continues with 'a' or 'b'.]LB[pg:b][pf:a]
(;W[pf];B[qg]LB[qc:B][jd:A]
(;W[jd]C[Black continues with 'a' or 'b'.]LB[ne:b][lf:a]
(;B[lf];W[nf])

(;B[ne];W[pd]
C[Black continues with 'a' for thickness, 'b' for territory.]
LB[qc:b][pg:a]
(;B[pg];W[qf];B[rf];W[qc];B[og];W[rc])

(;B[qc];W[pg];B[qh]
C[White continues by attacking the two black stones.])
)
)

(;W[qc]
C[Black 'A' influences the right side with 'A'.
'B' takes safe territory on the right side.
If Black has the ladder 'C' takes the corner for influence.]
LB[pd:C][qf:B][pg:A]
(;B[pg];W[pd];B[ng];W[qf];B[rf];W[rg];B[rh])

(;B[qf];W[pc];B[qj])

(;B[pd];W[od];B[pc];W[pb];B[qb];W[qf];B[rf]
C['A' is correct.
'B' depends on the ladder.
'C' is a disaster.]
LB[rc:C][rg:B][pg:A]
(;W[pg]
C['A' is correct, 'B' is possible with the ladder, but not recommended.]
LB[qh:B][rg:A]
(;B[rg]C['A' takes the top side. 'B' sacrifices for a huge wall.]
LB[rc:B][nb:A]
(;W[nb];B[pa];W[ob];B[rc];W[kc])

(;W[rc];B[ob];W[pa];B[oa];W[re];B[qa];W[pb];B[pa];W[rd];B[pb];W[qh];
B[rh];W[qi];B[ri];W[mc];B[rb];W[sb];B[sc];W[sd];B[sf];W[nb];B[se];
W[qj])
)

(;B[qh];W[rc];B[re];W[rb];B[ob];W[qa];B[oe];W[ne])
)

(;W[rg];B[re];W[qh];B[oe];W[ne];B[pg];W[of];B[rh];W[jc])

(;W[rc];B[re];W[rb];B[ob];W[qa];B[oe];W[nb];B[ne])
)
)
)

(;W[pg];B[pf];W[of];B[qf];W[ng];B[pc];W[nd]
C[Black continues with 'a' or 'b'.]LB[oh:b][id:a]
(;B[id];W[qg])

(;B[oh]
C[Black 13 prevents White from block on the right side, at the
expense of being thin from Black 3.]
;W[og];B[qh];W[jd];B[lf];W[jf];B[lh];W[ph];B[qi];W[oj])
)
)
)

(;W[of]
C[White 4 can be considered orthodox. Black responses range from
'a *', 'b *', 'c *' or 'd'.

Black 'e' is slow, but solid.]
LB[qf:e][od:d][pg:c][oe:b][qg:a]
(;B[qg]C[White continues with 'a *' to 'c *'.]LB[ph:c][jd:b][id:a]
(;W[id]
C[Black continues on 'A'.
If you are high-dan and know the follow-ups / punishments after
Black B or C. mail it to me please: kogo@waterfire.us.]
LB[lg:C][lf:B][mf:A];B[mf]C[White continues with 'a *', 'b *' to 'd'.]
LB[pe:d][nd:c][pd:b][qc:a]
(;W[qc]C[Black continues with 'a *' or 'b'.]LB[pd:b][rc:a]
(;B[rc]C[White continues with 'a *'. White 'b' is a trick play.]
LB[qf:b][pd:a]
(;W[pd]C[Black continues with 'a*' or 'b'.]LB[qb:b][qe:a]
(;B[qe]C[White continues with 'a *'. White 'b' is a mistake.]
LB[qb:b][pf:a]
(;W[pf]C[Black continues with 'a' or 'b *'.]LB[qb:b][qf:a]
(;B[qf];W[qb];B[nd];W[od])

(;B[qb];W[qf];B[rf];W[pc];B[rd];W[oh];B[nd];W[oe]
C[
* GOOD VARIATION *];B[qi])
)

(;W[qb]C[White 12 is a mistake.];B[oe];W[pe];B[pf];W[pg];B[qf];W[ne];
B[og];W[nf];B[ng];W[nd]
C[White must play 22. Letting Black play 22 is terrible.])
)

(;B[qb];W[qe];B[pc];W[rd];B[qc]
C[White continues with 'a'. White 'b' is not recommended.]
LB[oe:b][qf:a]
(;W[qf];B[od];W[nd];B[pe];W[pf];B[ne];W[qi]
C[White leaving the cut at 'a' until necessary is correct.]LB[oe:a])

(;W[oe]C[White 16 is not recommended.];B[ob];W[nc];B[mb];W[ph])
)
)

(;W[qf]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[rf:b][pc:a]
(;B[pc];W[pg];B[od];W[qh])

(;B[rf]C[Black 11 is just what White wants.];W[qe];B[re];W[pd];B[rd];
W[nd])
)
)

(;B[pd]
C[Black's strategy is to build thickness. White gets profit in
sente.]
;W[pc];B[od];W[rd];B[re];W[rc];B[nd])
)

(;W[pd]C[Black continues with 'a' or 'b *'.]LB[qc:b][qe:a]
(;B[qe]C['A' or 'B'.]LB[oh:B][qc:A]
(;W[qc];B[rc]
C[This position is the same as White 10 and Black 11 played before 
White 8 and White 9. See that variation
for continuation (at 'a').]
LB[rc:11][qe:9][qc:10][pd:8][pf:a])

(;W[oh])
)

(;B[qc];W[qe];B[re];W[rf];B[qf];W[pe];B[rd];W[oh]
C[
* GOOD VARIATION *

Black continues with 'a'. Black 'b' is not recommended.]
LB[mh:b][pi:a]
(;B[pi])

(;B[mh];W[qh]C[Black 'a' is correct. Black 'b' is not recommended.]
LB[rh:b][rg:a]
(;B[rg];W[oj])

(;B[rh]C[Black 19 is not recommended.];W[qi])
)
)
)

(;W[nd]C[Black continues with 'a' or 'b'.]LB[pd:b][jf:a]
(;B[jf];W[qc];B[rc];W[pd];B[qe];W[qb]
C[Black can play 'a', but because of the diagonal move (White 8),
Black cannot play 'b'.]
LB[oe:b][og:a]
(;B[og]
C[Black 15 seals White in, but White lives comfortably.
Continuations in the middle top side later:
Black 'A' or White 'B'. White 'C' is not recommended.]
PL[2]LB[ke:C][jc:B][jd:A]
(;B[jd];W[jc])

(;W[jc])

(;W[ke];B[je])
)

(;B[oe]C[Black 15 is a mistake.];W[pe];B[pf];W[nf])
)

(;B[pd]C[Black must have the ladder (shicho) to play this way.];W[le];
B[me];W[md];B[ke];W[lc];B[lf];W[kc])
)

(;W[pe]C[White 8 was invented by Sakata Eio.];B[qe]C['A' or 'B'.]
LB[oh:B][ph:A]
(;W[ph];B[pg];W[og];B[oh];W[nh];B[oi];W[mg])

(;W[oh];B[pi])
)
)

(;W[jd]C['A' or 'B'.]LB[mf:B][lf:A]
(;B[lf]
C[White 'a' or 'b' follow. For 'a' and 'b', see the variations
with White 6 one point more to the left. These moves give the
same result as other variations. For 'a' here is given only a
variation with a small difference at the end to White 6 one point
more to the left.

White 'c' is possible. White 'd'is not recommended..]
LB[jd:6][oh:d][ph:c][pd:b][qc:a]
(;W[qc];B[rc];W[pd];B[qb];W[qe];B[pc];W[rd];B[qc];W[qf];B[od];W[nd];
B[pe];W[pf];B[nc];W[qi])

(;W[ph]C[Black continues with 'a'. Black 'b' is weak.]LB[qh:b][pg:a]
(;B[pg];W[og]C[White continues with 'a' or 'b'.]LB[pe:b][oh:a]
(;B[oh]C['A' and 'B' are correct, 'C' is a mistake.]
LB[pe:C][pj:B][qe:A]
(;W[qe]C[Black continues with 'a' to 'e'.]
LB[pe:e][nh:d][re:c][od:b][pd:a]
(;B[pd];W[qf]C['A' or 'B'.]LB[od:B][pf:A]
(;B[pf];W[pe];B[oe];W[od];B[ne];W[rd];B[ng];W[rg];B[nf];W[rh];B[re];
W[rf];B[rc]C['A' or 'B'.]LB[qc:B][se:A]
(;W[se];B[pb])

(;W[qc];B[sd];W[pc];B[qi];W[ri];B[rj]PL[2];B[rd]C[Later];W[rb];B[sb];
W[ra];B[sf])
)

(;B[od];W[qh])
)

(;B[od]
C[White continues with 'a'. White 'b' is a mistake. White 'c' is
also not recommended.]
LB[pf:c][nd:b][qh:a]
(;W[qh];B[rg];W[pd];B[pe];W[pf];B[pc];W[qf];B[nc];W[rh])

(;W[nd]C[White 14 is a mistake.];B[pe];W[pf];B[qf])

(;W[pf]
C[White 14 was played by Otake Hideo against Rin Kaiho in a 1973
Japanese TV game. White ends up taking a small corner, giving
Black superior thickness.]
;B[pi];W[pd];B[pc];W[nd];B[pe];W[oe];B[pd];W[qf];B[qh];W[pb];B[ob];
W[rd];B[nc];W[qc];B[oc];W[rb];B[pa];W[qb])
)

(;B[re]
C[This was the most common response when this pattern first appeared.]
;W[pe]
C[Black continues with 'a' to 'c'. White 'a' and 'c' are peaceful,
while 'b' is fierce.]
LB[rd:c][pi:b][rf:a]
(;B[rf];W[qc]C[White 16 is painful for Black to endure.];B[rd];W[mg];
B[oi];W[nh];B[jf])

(;B[pi]C[Black 15 results in a severe fight.];W[nh];B[oi];W[rf];B[rd];
W[qf];B[pc])

(;B[rd]C[White continues with 'a'. White 'b' is not recommended.]
LB[pi:b][mg:a]
(;W[mg];B[pi];W[nh];B[oi]
C[White continues with 'a'. White 'b' is not recommended.]
LB[ke:b][jf:a]
(;W[jf];B[lg];W[lh];B[jg];W[ke]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[le:b][kh:a]
(;B[kh];W[le];B[mf];W[me];B[li];W[mh];B[ni])

(;B[le]C[Black 25 is not recommended.];W[kg];B[kf];W[kh];B[jc];W[ic];
B[id];W[je]
C[Black will not be able to make a live group with top center stones.])
)

(;W[ke]C[White 20 is not recommended.];B[le];W[kg];B[jc];W[ic];B[id];
W[ie];B[hd];W[kc];B[jb];W[kd];B[kb];W[lc];B[lb];W[mc];B[gc]
C[White is over-concentrated.])
)

(;W[pi]C[White 16 is a not recommended.];B[nh];W[me]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[le:b][mf:a]
(;B[mf];W[le];B[ke];W[kd];B[ne];W[md];B[nd];W[mc];B[nc])

(;B[le]C[Black 19 is a mistake.];W[mg])
)
)
)

(;B[nh];W[pd];B[re];W[rd];B[qc];W[qf];B[rf];W[rc];B[pi])

(;B[pe];W[nh];B[re];W[oi];B[nd])
)

(;W[pj];B[nh];W[qh]C['A' or 'B'.]LB[pe:B][rh:A]
(;B[rh];W[ri];B[rg];W[qc])

(;B[pe];W[oe];B[pc])
)

(;W[pe];B[qe];W[nh];B[oi];W[mg])
)

(;B[pe];W[oe];B[oh];W[pj];B[nh];W[qh]
C[Black continues with 'a' or 'b'.]LB[od:b][nd:a]
(;B[nd];W[od];B[qc];W[re];B[rf];W[pf];B[qe];W[rh];B[qf];W[pb];B[qb]
C[White continues with 'a'. White 'b' is a mistake.]LB[mg:b][mc:a]
(;W[mc]
C[If Black 'a', White can break through. If Black 'b', White 'a',
and White makes life.]
LB[mg:b][lc:a])

(;W[mg]C[White 28 is a mistake in order.];B[ng];W[mc];B[mf];W[lc];
B[kc])
)

(;B[od];W[nd];B[pd])
)
)

(;B[qh]C[Black 9 is timid.];W[pi];B[qi];W[pj]C['A' or 'B'.]
LB[lh:B][qk:A]
(;B[qk];W[pe];B[qe]C['A' or 'B'.]LB[jf:B][lh:A]
(;W[lh];B[jf];W[hd];B[kh];W[li])

(;W[jf])
)

(;B[lh];W[qj])
)
)

(;W[oh]C[White 8 incites an attack by Black.];B[oe];W[ne];B[nd];W[pe];
B[od];W[pd];B[pf];W[qe]C[Black continues at 'a' or 'b'.]LB[pc:b][og:a]
(;B[og];W[pc];B[nf])

(;B[pc]
C[White can play 'a' to take the corner or 'b' for outside thickness.]
LB[pg:b][qc:a]
(;W[qc]C[White goes for the corner.];B[pb];W[rd];B[og]
C[White can play a forcing move at 'a'. White 'b' doesn't work.]
LB[nf:b][nh:a]
(;W[nh])

(;W[nf]C[White 22 is unreasonable.];B[ng];W[md];B[nc];W[mc];B[nb];
W[me];B[lc])
)

(;W[pg]C[White goes for thickness.];B[re];W[qf];B[rf];W[pf];B[qc];
W[md];B[nc];W[mc];B[nb];W[mf];B[mb];W[lc])
)
)
)

(;B[mf];W[pd]C['A' or 'B'.]LB[qe:B][qc:A]
(;B[qc];W[qe];B[re];W[rf];B[qf];W[pe];B[rd];W[oh];B[pi];W[mh])

(;B[qe];W[qc];B[rc];W[pf];B[qb];W[pc];B[qf];W[oh])
)
)

(;W[ph]C[Black continues with 'a *' or 'b'.]LB[pg:b][qh:a]
(;B[qh];W[pi];B[qi];W[pj]
C['A' is usual, 'B' is also possible to make a moyo on top,]
LB[id:B][qk:A]
(;B[qk]C[White continues with 'a *'. White 'b' is a mistake.]
LB[id:b][pe:a]
(;W[pe];B[qe];W[id]C[
* GOOD VARIATION *])

(;W[id]C[White 12 is a mistake.];B[oe];W[ne];B[nd];W[pe];B[od];W[pd];
B[pf];W[qe];B[pc];W[qc];B[pb]C[White continues with 'a' or 'b'.]
LB[nc:b][rd:a]
(;W[rd];B[ob])

(;W[nc];B[md];W[qb];B[re];W[rd];B[qf];W[qd];B[og];W[nf];B[mg];W[ng];
B[nh];W[oh];B[mf];W[pg];B[me];W[og];B[ni])
)
)

(;B[id]
C[White plays locally on 'A' or tenuki to build a large moyo on
the lower side.]
LB[qj:A]
(;W[qj]PL[2];W[qb]C[Later.])

(;W[tt];B[qk];W[ol];B[ql])
)
)

(;B[pg];W[og];B[oh]
C[White continues with 'A' or 'B'. White 'C' is a mistake.]
LB[pi:C][qe:B][pj:A]
(;W[pj]C[Black continues at 'a'. Black 'b' is not recommended.]
LB[pi:b][nh:a]
(;B[nh];W[qh];B[rh];W[ri];B[rg];W[mf];B[tt]C[Black plays elsewhere.];
W[qc];B[rc];W[qe]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pd:b][re:a]
(;B[re];W[pd];B[rd])

(;B[pd]C[Black 20 is not recommended.];W[re]
C[Black has the cut at 'a' to live, but White has the better of
it.]
LB[qi:a])
)

(;B[pi]AW[pp]
C[Black 11 is not recommended, but there are circumstances where
it may work. For analysis sake, assume a lower right White corner
stone as shown.]
;W[oi];B[qh];W[nh];B[oj];W[ph];B[qi]
C[White continues with 'a'. White 'b' is not recommended.]
LB[pl:b][nj:a]
(;W[nj];B[ok];W[nk];B[ol]
C[White continues with a pincer around 'a'. White 'b' is not recommended.]
LB[nm:b][id:a]
(;W[id];B[nl]
(;W[ml];B[mm];W[nm])

(;W[mq];B[ll];W[jg]C[White plays on a large scale.])
)

(;W[nm]AB[co][dq]AW[cc]
C[Yoshio Ishida played White 22 against Rin Kaiho in the 5th game
of the 1973 12th Meijin Title match. White 22 is too mild, according
to Ishida.]
;B[om];W[on];B[pn];W[nn];B[hc]C[Black 27 gives Black the advantage.];
W[iq];B[nl];W[ml];B[qm];W[po];B[jp];W[ip];B[jo];W[io];B[jn];W[kr];
B[in];W[qn];B[pm];W[rn];B[rm];W[jc];B[jd];W[kc];B[kd];W[lc];B[ic];
W[lm];B[gn];W[cj];B[pc];W[ob];B[mc];W[mb];B[jb];W[kb];B[ka];W[lb];
B[nc];W[md];B[nd];W[od];B[nb];W[ib];B[na];W[ja];B[ne];W[pd];B[hb];
W[ia];B[re];W[qc];B[rc];W[pf];B[qb];W[df];B[cl];W[ej];B[ec];W[ed];
B[dc];W[cd];B[rp];W[qq];B[gq];W[go];B[jk];W[kg];B[ig];W[ih];B[hh];
W[ii];B[jg];W[kh];B[hi];W[ij];B[gg];W[eo];B[fn];W[hn];B[hm];W[ho];
B[gl];W[fo];B[dp];W[dm];B[cm];W[hj];B[dl];W[il];B[ik];W[hk];B[jl];
W[kf];B[ie];W[hl];B[im];W[km];B[jm];W[el];B[fl];W[em];B[fj];W[do];
B[gj];W[er];B[fr];W[eq];B[dr];W[fq];B[es];W[ro];B[lk];W[kj];B[mk];
W[kk];B[ll];W[kl];B[mm];W[lo];B[mi];W[mf];B[lp];W[mq];B[mp];W[np];
B[lq];W[mr];B[lr];W[ls];B[jq];W[ir];B[jr];W[js];B[so];W[sn];B[sm];
W[sp];B[bk];W[bj];B[cb];W[bb];B[db];W[me];B[oa];W[fi];B[gi];W[cp];
B[bo];W[gr];B[fs];W[gs];B[ds];W[is];B[ba];W[bc];B[dd];W[de];B[ee];
W[ef];B[ha];W[la];B[fe];W[pb];B[pa];W[fh];B[fg];W[eg];B[aj]
C[White resigns.])
)

(;W[pl]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[pk:b][nj:a]
(;B[nj];W[qj];B[lh]
C[White is surronded, facing hard fighting. Black 'a' helps keep
White in, and later Black can look to the invasion at 'b'.]
LB[pn:b][ni:a])

(;B[pk]C[Black 19 is a mistake.];W[ok];B[qj];W[nj])
)
)
)

(;W[qe];B[pd];W[qf];B[pf];W[pe];B[oe];W[od];B[ne];W[rd];B[ng])

(;W[pi]C[White 10 is too slow.];B[nh];W[mf];B[ok]
C[The attack of Black 13 illustrates the problem with White 10.
White 'a' is usually sente, but not a good play now.]
LB[qh:a])
)
)
)

(;B[oe]
C[White 'a *' is typical, but White 'b' is conceivable if White
greatly favors the right side.]
LB[qf:b][ne:a]
(;W[ne]
C[Joseki continues with Black 'a *'.

Black 'b' is a trick play at best, a mistake if White plays properly.]
LB[nd:b][pe:a]
(;B[pe]C[White continues with 'a *', 'b *' or 'c'.]
LB[md:c][mc:b][nd:a]
(;W[nd];B[nf];W[mf];B[ng];W[le]C[Black continues with 'a *' or 'b'.]
LB[jd:b][og:a]
(;B[og];W[kd]C[
* GOOD VARIATION *])

(;B[jd]
C[White continues with 'a'. White 'b' is vulgar, but Black must
respond carefully. White 'c' is unreasonable.]
LB[pg:c][og:b][qf:a]
(;W[qf]
C[Black continues with 'a'. 

Black 'b' is a mistake. If Black 'b' worked, White 14 would be
a bad play.

Likewise, Black 'c', an attempt to forestall the result of Black
'b', White 'a', does not work.]
LB[ph:c][og:b][pf:a]
(;B[pf];W[og]
C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
LB[oh:c][nh:b][pg:a]
(;B[pg];W[oh];B[qi]C['A' is correct, 'B' is too small, 'C' too small.]
LB[oi:C][mh:B][oj:A]
(;W[oj])

(;W[mh];B[oi];W[nh])

(;W[oi])
)

(;B[nh]C[White continues with 'a' or 'b'.]LB[oh:b][pg:a]
(;W[pg];B[qg];W[qh];B[rg];W[oi];B[rh];W[qi];B[ri];W[qj];B[ni];W[oj])

(;W[oh];B[oi];W[qg]
C[Black continues with 'a'. Black 'b' is a mistake, as is 'c'.]
LB[pi:c][qh:b][pg:a]
(;B[pg];W[ph];B[qh];W[pi];B[rh];W[ni];B[lg];W[oj];B[ke];W[rc]
C[White 30 is the tesuji to enable White to live in the corner.
Black continues with 'a'. Black 'b', resisting, means death.]
LB[qc:b][qe:a]
(;B[qe];W[qc])

(;B[qc]C[Black 31 is a mistake.];W[qe];B[pd];W[rd];B[rb];W[qb]
C[The familiar sacrifice and false eye tesuji.];B[pb];W[qa];B[ra];
W[pc];B[pa];W[qb];B[qa];W[od];B[qb];W[sb])
)

(;B[qh]C[Black 21 is a mistake.];W[pi])

(;B[pi]C[Black 21 is a mistake.];W[qh];B[qi];W[rd];B[rc];W[re];B[qc];
W[qe];B[pd];W[ri];B[rj];W[si]
C[White is almost alive, and Black's corner stones are destined
to be dead.])
)
)

(;B[oh]C[Black 17 is a mistake.];W[pg];B[ph];W[qg];B[qh]
C['A' is correct, 'B' a mistake.]LB[rd:B][rh:A]
(;W[rh];B[ri];W[rg];B[qj];W[rd];B[rc];W[re])

(;W[rd];B[re];W[qe];B[rg])
)
)

(;B[og]C[Black 15 doesn't work.];W[pf];B[qh];W[rd];B[rc];W[re];B[qc];
W[qe];B[pd];W[rh];B[ri];W[rg];B[qi];W[sf]C[Black's corner stones die.])

(;B[ph]C[Black 15 does not work.];W[pf];B[qh];W[rd];B[rc];W[re];B[qc];
W[qe];B[pd];W[pb]
C[White is once again one move ahead in the race to capture.])
)

(;W[og]C[White 14 is bad style, but Black must respond carefully.];
B[oh];W[pg];B[ph];W[qg]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[qh:b][qi:a]
(;B[qi];W[ri];B[rj];W[nh];B[mg];W[qh];B[pj];W[ni]
C[White can struggle, but should not be able to succeed.])

(;B[qh]C[Black 19 is a mistake.];W[rh];B[ri];W[rf];B[sh];W[rg];B[qj];
W[rd];B[rc];W[qe]
C[White succeeds owing to Black needing to play 25 to protect against
the cut.])
)

(;W[pg]C[White 14 is unreasonable.];B[ph];W[qh];B[pi]
C['a' and 'b' are miai.]LB[qg:b][qi:a])
)
)

(;W[mc]
C['A *' is joseki. If Black is strong on the top side, he can close
in White in small space with 'B'.]
LB[lc:B][nf:A]
(;B[nf];W[me]C[Black continues with 'a *' or 'b'.]LB[ng:b][og:a]
(;B[og];W[mf];B[ng]
C[
* GOOD VARIATION *

White 'A' is the best, 'B' the most solid continuation. Playing
elsewhere ('C') is also possible.]
LB[dp:C][kb:B][jd:A]
(;W[jd])

(;W[kb])

(;W[tt]C[White plays elsewhere.];B[lc]
C[White continues with 'a'. White 'b', playing elsewhere, is conceivable,
and results in ko.]
LB[cq:b][mb:a]
(;W[mb];B[pb]
C[White playing elsewhere with 14 is not recommended if this is
the outcome of Black 15. White has a tough fight ahead in the
center while Black should be able to make profit.])

(;W[tt]C[White plays a second move elsewhere. A ko results.];B[mb];
W[nb];B[md];W[nd])
)
)

(;B[ng];W[id]C[White aims at 'a'.]LB[qf:a];B[tt]
C[Black plays elsewhere.];W[qf];B[pf];W[og];B[ph]
C[Black can only play 16 with a favorable ladder.];W[oh];B[oi];W[nh];
B[pg];W[mh])
)

(;B[lc];W[nf];B[qg])
)

(;W[md]
C[Black continues with 'a'. Black 'b' is just what White wants.]
LB[le:b][nf:a]
(;B[nf]C[White continues with 'a'. White 'b' is exceptionally bad.]
LB[mf:b][le:a]
(;W[le];B[mf];W[kd];B[og];W[lc])

(;W[mf]C[White 10 is a mistake.];B[ng];W[mg];B[nh];W[lc];B[mh])
)

(;B[le]C[Black 9 is a mistake.];W[nf];B[qg];W[id];B[lg];W[oi])
)
)

(;B[nd]
C[Black 7 is aggressive.

White continues with 'a'. White 'b' is a mistake.]
LB[od:b][pe:a]
(;W[pe];B[od];W[pd]C[Black may try 'a' or 'b'.]LB[pc:b][pf:a]
(;B[pf];W[qe];B[qf];W[qc]
C[White gets a big corner. Black gets a mess.])

(;B[pc];W[qc];B[pb];W[qe]C[White gets a favorable result.])
)

(;W[od]C[White 8 is a mistake.];B[pe];W[md];B[nf]
C[Black starts a squeeze play.];W[nc];B[me])
)
)

(;W[qf];B[nf];W[pf]C[Black continues with 'a' or 'b'.]LB[ne:b][od:a]
(;B[od];W[ng];B[mg];W[nh])

(;B[ne];W[qj];B[pb])
)
)

(;B[pg]
C[Black 5 is provacative. White continues with 'a *' or 'b *',
but White must have the ladder to play 'b'. White 'c' is bad
timing.]
LB[qe:c][pf:b][og:a]
(;W[og]C[Black continues with 'a *'. Black 'b' is an overplay.]
LB[ph:b][pf:a]
(;B[pf]C[White continues with 'a *'. White 'b' and 'c' are mistakes.]
LB[oe:c][pe:b][oh:a]
(;W[oh];B[oe];W[ne];B[nd];W[od];B[pe];W[md]
C[Black continues with 'a *' or 'b'.]LB[me:b][nc:a]
(;B[nc];W[mc];B[nb];W[me]
C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[mb:b][ob:a]
(;B[ob];W[ph]C[
* GOOD VARIATION *])

(;B[mb]
C[White continues with 'a'. White 'b' leaves flaws in White's thickness.]
LB[lb:b][lc:a]
(;W[lc];B[lb];W[kc]C[White 22 gives White excellent thickness.];B[qi])

(;W[lb]C[White 20 is unnecessary resistance.];B[lc];W[kb];B[ob];W[ke];
B[qi];W[dp]C[White plays elsewhere.];B[le]
C[Black 27 is reckless. Black captures the two white stones, but
gives White a wall of thickness.]
;W[lf];B[mf];W[nf];B[kf];W[lg];B[kd];W[je];B[jd];W[id];B[ie];W[jf];
B[ic];W[hd];B[jc];W[hc];B[jb])
)
)

(;B[me];W[nc];B[nf];W[nd];B[lf];W[lc];B[kd];W[kc];B[jd];W[ic];B[qi];
W[mg];B[mf];W[kh])
)

(;W[pe]
C[White 8 looks reasonable, but superfluous and loses White the
good play at 'a'.]
LB[qc:a];B[qe];W[oh];B[ph];W[oi];B[qj];W[dp]C[White plays elsewhere.];
B[od]C[The consequence of White 8 is that Black can attack.];W[nd];
B[ne])

(;W[oe]C[White 8 is timid, giving Black a superior position.];B[ph]
C[In a professional game Black would have a decided advantage due
to White 8.])
)

(;B[ph]C[Black 'b' is a mistake.];W[qe];B[pd];W[pf];B[od];W[oh]
C[Black continues with 'a' to capture White 2. Black 'b' is greedy
and lets White 2 into play.]
LB[pi:b][mc:a]
(;B[mc];W[pj]
C[White's thickness compensates for the loss of the corner.])

(;B[pi]C[Black 13 is a mistake.];W[ok];B[qk];W[nd]
C[Black continues with 'a' or 'b', neither good.]LB[nc:b][ne:a]
(;B[ne];W[nc]C[If Black 'a' or 'b', White 'c'.]LB[lb:c][oe:b][me:a])

(;B[nc];W[mc];B[nb];W[md];B[ob])
)
)
)

(;W[pf]C[White must have the ladder to play this way.];B[qf];W[qg];
B[qh];W[rg]C[Black continues with 'a *' or 'b'.]LB[rh:b][rf:a]
(;B[rf];W[rh];B[qi]
C[White continues with 'a *'. White 'b' is not recommended.]
LB[ph:b][qc:a]
(;W[qc]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[rc:b][pd:a]
(;B[pd];W[pc];B[ri];W[og];B[ph];W[rd];B[re];W[rc];B[id]
C[
* GOOD VARIATION *

Note that, because of shortage of liberties, Black cannot separate
White with 'a' or 'b'.]
LB[ne:b][od:a])

(;B[rc]C[Black 15 is just what White hopes for.];W[pd];B[re];W[ph];
B[og];W[pi]C[If now Black 'a', White 'b' is good enough.]
LB[qj:b][nf:a])
)

(;W[ph]C[White 14 is a mistake.];B[og];W[pi];B[nf];W[qj];B[oe])
)

(;B[rh]
C[White continues with 'a'. White 'b' is also possible, but in
that variation Black gains outstanding thickness.]
LB[rf:b][og:a]
(;W[og];B[ph];W[qe];B[rf];W[re];B[sg];W[pd])

(;W[rf]C[Black gets nice thickness with this variation.];B[qe];W[ph];
B[og];W[ng];B[oh];W[pi];B[nh];W[qi];B[nf];W[ne];B[mg];W[od];B[me];
W[qb];B[re];W[ri];B[rb];W[pb];B[rc];W[lb];B[ra])
)
)

(;W[qe]C[Black 6 is a move before its time.];B[pd];W[pf];B[od];W[qg];
B[mc]C[White 6 & 10 are over-concentrated.])
)

(;B[od]C[Black 5 only works when Black is strong in this area.];W[nd]
C[Black continues with 'a'. Black 'b' is a mistake. Black 'c' is
strange but possible; Black must have the ladder to play this
way.]
LB[ne:c][oe:b][pc:a]
(;B[pc];W[oe];B[pd]
C[White continues with 'a' to 'c'. White must have the ladder to
play 'a'. White 'd' is a mistake.]
LB[me:d][md:c][mf:b][nb:a]
(;W[nb]C['A' or, with the ladder, 'B'.]LB[ne:B][qg:A]
(;B[qg];W[mf])

(;B[ne]C[If White does not have the ladder (this is not joseki).];
W[me];B[nf];W[md];B[og]
C[The worst that can happen is a seki in the corner.];W[pb];B[qb];
W[pf];B[pg];W[qf];B[qg];W[rg];B[rh];W[re];B[sg];W[rf];B[ng];W[rc];
B[rd];W[sd];B[rb];W[sb];B[pa];W[ob];B[ra];W[se];B[lc]
C[Black plays to bring White's 7 stones under attack. White's disadvantage
is obvious.])
)

(;W[mf]C[Black continues with 'a' or the interesting move at 'b'.]
LB[ob:b][nc:a]
(;B[nc];W[mc]C[Black continues with 'a'. Black 'b' is unreasonable.]
LB[md:b][ob:a]
(;B[ob]C['A' or 'B'.]LB[nb:B][md:A]
(;W[md];B[mb];W[lc])

(;W[nb])
)

(;B[md];W[nb];B[ne];W[nc];B[nf];W[ng];B[me];W[og];B[kc];W[pb];B[qb];
W[kb];B[jb];W[lb];B[jc];W[qa];B[ra];W[pa];B[rc])
)

(;B[ob];W[nc];B[nb]C['a' and 'b' are miai.]LB[lc:b][mc:a])
)

(;W[md]C[Black continues with 'a' or 'b'.]LB[lc:b][le:a]
(;B[le];W[mf];B[qg]
C[White continues with 'a' or 'b' or elsewhere depending on the
situation.]
LB[hd:b][nb:a])

(;B[lc];W[mc];B[qg];W[le];B[ke];W[lf];B[jd])
)

(;W[me]C[White 10 is a mistake.];B[nc];W[mc];B[ob]
C[White plays 'a' for a ko, or 'b' if White cannot hope to win
the ko.]
LB[md:b][nb:a]
(;W[nb];B[qg]C[Black waits for the right time to start the ko at 'a'.]
LB[md:a])

(;W[md];B[mb];W[lc]
C[From this position it is clear that White 10 would be better
at 'a'.]
LB[mf:a])
)
)

(;B[oe]C[Black 7 is vulgar.];W[ne]
C[Black now has a liberties problem. Black cuts at 'a' or 'b'.
The Black cut at 'a' leads to more variations than the cut at
'b'.]
LB[nf:b][nc:a]
(;B[nc];W[mc];B[nb]
C[White continues with 'a' to 'c'. White 'd' is unreasonable.]
LB[pc:d][md:c][lc:b][ob:a]
(;W[ob];B[mb];W[lc]
C[Black continues with 'a', or the severe move at 'b'.]LB[lb:b][pc:a]
(;B[pc];W[nf]
C[The drawback to this position for White is the Black cut at 'a'.
White has a strong position to fight from, but this may change
as the board develops.

The advantage is that later White can later play the marked point
after Black plays elsewhere ('b').

Black 'c' is a mistake.]
LB[lb:c][dp:b][md:a]MA[pb]
(;B[md];W[lb];B[pb];W[kd];B[le];W[jc])

(;B[tt]C[Black plays elsewhere.];W[pb];B[qb];W[qe])

(;B[lb]C[Black 17 is a mistake.];W[kc]
C[White 18 prevents the cut at 'a', and allows White tough response
to Black on the right side.]
LB[md:a];B[qf];W[qg];B[rg];W[pf];B[qe];W[qh]C[Black is too low.])
)

(;B[lb];W[kc];B[nf]
C[White 'a' is correct, though the continuation is tricky. White
'b' is premature.]
LB[qb:b][mf:a]
(;W[mf];B[ng];W[qb];B[kb];W[jc];B[mg];W[le];B[lf];W[me];B[ke];W[md];
B[jb];W[ic]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[rb:b][rc:a]
(;B[rc];W[rb];B[sb]
C[White must figure out the best way to sacrifice the four White
stones. White continues with 'a'. White 'b' is a mistake.]
LB[pc:b][pf:a]
(;W[pf];B[qe];W[qf];B[rf];W[rg];B[pc];W[pb];B[re];W[ib]
C[Black continues with 'a'. Black 'b' makes a ko.]LB[oa:b][na:a]
(;B[na]C[Black 43 ensures a one-move win.];W[ph]
C[White's loss in the corner is compensated for by profit from
attacking Black in the center.])

(;B[oa]C[Black 43 creates a ko situation.];W[na])
)

(;W[pc]C[White 34 doesn't work as planned.];B[pd];W[pa];B[ib]
C[Living with 'a' is small, while Black 'b' is bad for White.]
LB[hc:b][ra:a])
)

(;B[rb];W[qc];B[rc];W[pd];B[pe];W[qe];B[pc];W[pf])
)

(;W[qb];B[md];W[me];B[kd]
C['a' and 'b' are miai. This is what White must guard against (and
does so in the other variation). From here, White is lost.]
LB[mf:b][jc:a])
)
)

(;W[lc];B[ob];W[nf])

(;W[md];B[ob];W[ng])

(;W[pc]C[White 12, refusing to sacrifice White 2, is a mistake.];B[mb]
;W[pd];B[pe];W[qe];B[pf]
C[White continues with 'a', or slightly better, 'b'.]LB[qf:b][rd:a]
(;W[rd];B[qf];W[re];B[nf];W[me];B[og]
C[White 'a' is impossible because of Black 'b'. The White center
stones are a burden and there is no good way to use them.]
LB[md:b][lc:a])

(;W[qf];B[pg];W[rd];B[qg];W[nf];B[md];W[nh];B[re];W[qc];B[rf];W[ob];
B[pj]C[White's corner territory is barely 10 points.])
)
)

(;B[nf];W[pc]
C[Black continues with 'a'. Black 'b' is mild. Black 'c' is not
recommended.]
LB[mf:c][qe:b][qc:a]
(;B[qc];W[og];B[pd]
C[White continues with 'a'. White 'b' is a mistake.]LB[mf:b][mc:a]
(;W[mc];B[mf];W[kc]C[White 'a' is sente.]LB[qf:a])

(;W[mf]C[White 14 is a mistake.];B[nc]
C[The two White stones are wasted.])
)

(;B[qe];W[qc])

(;B[mf];W[pd];B[pe];W[qe];B[pf];W[qf];B[pg];W[mc];B[qg];W[rd]
C[White's profit exceeds Black influence.])
)
)

(;B[ne]
C[Black must have the ladder to play this way. White continues
at 'a'. White 'b' is a mistake.]
LB[oe:b][pd:a]
(;W[pd];B[oe];W[pe];B[pc];W[qc];B[pb];W[qe]
(;B[nc];W[qb];B[ob];W[pg])

(;B[qb];W[rc]C[Black has lost the cut at 'a'.]LB[pf:a])
)

(;W[oe]C[White 8 is a mistake.];B[pd];W[me];B[nc];W[nf];B[mc])
)
)

(;B[qf]
C[Black 5 is not joseki, being a bit slow.

White continues with 'a' or 'b'. White 'c' and 'd' are mistakes.]
LB[nd:d][qc:c][jd:b][pe:a]
(;W[pe]C[White 6 ensures connection between White 2 and 4.];B[qe];
W[jd];B[lf];W[oh])

(;W[jd];B[lf]C['A' or 'B'.]LB[qc:B][pe:A]
(;W[pe];B[qe];W[oh]C['A' or 'B'.]LB[lh:B][qi:A]
(;B[qi];W[lh];B[jf];W[hd])

(;B[lh];W[qi];B[pc];W[pb];B[qb])
)

(;W[qc];B[od];W[pc];B[oe])
)

(;W[qc]C[White 6 is a mistake.];B[od]C[Black 7 is a a severe move.];
W[pc];B[oe]C[Black gets a favorable result.])

(;W[nd]C[White 6 is gote.];B[pb]
C[Locally, Black 7 is an ideal grab of the corner.])
)
)

(;W[oe]
C[White 4 is standard with the one-space pincer, high or low, but
it is not played with the low two- or three-space pincer. White
4 reflects a special strategy by White. Black continues with
'a *' or 'b'.]
LB[qg:b][pf:a]
(;B[pf]C[White continues with 'a *'. White 'b' is a mistake.]
LB[of:b][qc:a]
(;W[qc]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[pd:b][rc:a]
(;B[rc]
C[White continues with 'a *'. White 'b' is a mistake in this case.]
LB[pd:b][qb:a]
(;W[qb]
C[White 8 is important. White continues with 'a *', or simply at
'b'.]
LB[qj:b][pd:a]
(;B[pd];W[od]
C[White continues with 'a', 'c *', 'd' or 'e'. Black 'd' is an
old pattern, not recommended, as it strengthens White.
'b' is not good.]
LB[mc:e][pg:d][qj:c][mf:b][qi:a]
(;B[qi];W[lb])

(;B[mf];W[ng];B[pg];W[nf];B[qj]C[Black now lacks a good move at top.])

(;B[qj]AB[pq][ce]AW[dp][dc]
C[
* GOOD VARIATION *

Yoshio Ishida versus Rin Kaiho, 6th game of the 13th Meijin Title,
1974.]
;W[dh];B[hc];W[lb];B[ed];W[ec];B[fd];W[fc];B[gd];W[cd];B[bd];W[bc];
B[dd];W[cc];B[fq];W[dn];B[dr];W[cq];B[iq];W[cf];B[be];W[df];B[de];
W[dk];B[po];W[kd];B[ke];W[je];B[kf];W[jd];B[ef];W[qm];B[of];W[qp];
B[qo];W[ro];B[rn];W[qi];B[pj];W[rp];B[qn];W[pp];B[op];W[oq];B[qq];
W[rq];B[or];W[nq];B[np];W[rm];B[rr];W[rj];B[rk];W[rh];B[pl];W[qr];
B[pr];W[rs];B[sr];W[mp];B[on];W[nr];B[qs];W[qf];B[pe];W[re];B[pc];
W[pb];B[rd];W[sk];B[sl];W[sj];B[pi];W[ph];B[sh];W[sg];B[rg];W[qk];
B[qg];W[pk];B[ok];W[ql];B[sm];W[pm];B[mo];W[rl];B[sn];W[qh];B[sf];
W[ni];B[oj];W[pg];B[se];W[ng];B[nf];W[om];B[nm];W[nl];B[ol];W[nn];
B[mm];W[so];B[lp];W[nk];B[lc];W[kb];B[mb];W[mc];B[nc];W[nb];B[md];
W[ma];B[ib];W[jb];B[gb];W[fb];B[fo];W[jf];B[ac];W[ab];B[eh];W[di];
B[cr];W[br];B[kg];W[jg];B[fm];W[kh];B[mg];W[ip];B[jq];W[bg];B[gi];
W[hj];B[gj];W[hi];B[gk];W[hk];B[hh];W[ih];B[hg];W[hm];B[dm];W[cm];
B[cn];W[em];B[en];W[do];B[el];W[dl];B[dq];W[bp];B[in];W[hn];B[ho];
W[io];B[im];W[hp];B[go];W[kn];B[jo];W[lo];B[ln];W[jn];B[il];W[jl];
B[jp];W[ik];B[hq];W[hl];B[gp];W[ko];B[mq];W[ll];B[lh];W[li];B[mi];
W[lj];B[ki];W[jh];B[mj];W[nj];B[lk];W[kj];B[kk];W[jj];B[mk];W[cs];
B[ek]C[Black wins by resignation.])

(;B[pg];W[lb];B[qk])

(;B[mc];W[me]
C['A' or 'B' are correct. Any play on the top side like 'C' is
a mistake.]
LB[hc:C][qi:B][ph:A]
(;B[ph])

(;B[qi])

(;B[hc];W[ph];B[of];W[nf];B[og]C[Black in bad shape.])
)
)

(;B[qj]
C[White could attack at 'a', or play elsewhere ('b'). White 'c',
prompting Black 'a', is weak.]
LB[pd:c][dp:b][qe:a]
(;W[qe];B[pe];W[rd];B[pd];W[re];B[od];W[nc];B[nd]
C[Black's thickness is better than White's profit.])

(;W[dp]C[White plays elsewhere.];B[pe]
C[Black 11 is the recommended follow-up locally.])

(;W[pd]C[White gives Black a "thank-you" move.];B[qe])
)
)

(;W[pd]C[White 8 is a mistake.];B[qe];W[qb];B[qj]
C[White 4 is wrongly placed. It should be at 'a'.]LB[nd:a])
)

(;B[pd]C[Black 7 is a mistake.];W[pc];B[od];W[nd]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nc:b][ne:a]
(;B[ne];W[me];B[nf];W[md])

(;B[nc]C[Black 11 is a mistake.];W[mc];B[ne];W[md];B[me];W[of]
C[Black's shape is thin.])
)
)

(;W[of]C[White 6 is a mistake.];B[pg]
C[White makes Black crawl along the fourth line, the "line of victory".])
)

(;B[qg]C[White continues with 'a' or 'b'.]LB[pf:b][qc:a]
(;W[qc];B[rc];W[qb]C[Black normally plays 'a', but 'b' is playable.]
LB[nd:b][pd:a]
(;B[pd];W[od]
C[Black must reinforce at 'a', so is dissatisfied. Playing elsewhere
('b') is a mistake.]
LB[dp:b][qi:a]
(;B[qi])

(;B[tt]C[Black plays elsewhere, a mistake.];W[re];B[rd];W[qf];B[pf];
W[rg];B[qh];W[rh]C[Black continues with 'a'. Black cannot play 'b'.]
LB[qi:b][pe:a]
(;B[pe];W[qi])

(;B[qi]C[Black 19 is unreasonable.];W[pe];B[qe];W[rf];B[ri];W[rb])
)
)

(;B[nd];W[od];B[re]LB[lb:B][mb:A]
(;W[mb];B[kc])

(;W[lb]C[White 12 at 'a' is also feasible.])
)
)

(;W[pf]
C[White gets settled quickly, but he should only play this way
when driven by necessity, as all the subtlety is taken out of
the position.]
;B[qf];W[qc];B[rc];W[pd];B[qe];W[qb])
)
)

(;W[me]
C[White 4 is typical of the severity of modern Go. White must have
a position in the top-left corner to play this way. Black continues
with 'a *', 'b *' or 'c'. Black 'd' indicates a special strategy.
Black 'e' and 'f' are unreasonable.]
LB[md:f][nd:e][le:d][qg:c][pf:b][od:a]
(;B[od]
C[White continues with 'a *', 'b *' or 'c'. White 'd' is a mistake.]
LB[nd:d][nc:c][pd:b][md:a]
(;W[md]C[Black continues with 'a *'. Black 'b' is vulgar.]
LB[nc:b][pc:a]
(;B[pc]
C[White continues with 'a *'. 

White 'b' is a bit heavy. 

White 'c' is the old joseki pattern. White 'c' is less favorable
because White does not get as much territory as in variation
'a'. 

White 'd' is not recommended, as it results in a relatively insecure
position for White.]
LB[oe:d][lc:c][nc:b][ob:a]
(;W[ob]C[Black continues with 'a *'. Black 'b' is submissive.]
LB[pb:b][mc:a]
(;B[mc]
C[White continues with 'a *'. White 'b' looks better than it is.]
LB[lc:b][nd:a]
(;W[nd]
C[Black continues with 'a *'. Black 'b' is not recommended, as
it gives White favorable thickness in return for capturing two
stones.]
LB[nc:b][oe:a]
(;B[oe];W[lc]C[
* GOOD VARIATION *

Black continues with 'a' or 'b'.]
LB[pb:b][kc:a]
(;B[kc];W[lb];B[kd];W[mb])

(;B[pb]
C[White continues with 'a'. White cannot afford to play elsewhere.]
LB[dp:b][kc:a]
(;W[kc];B[jc]C[This is a follow-on (1-177).];W[jd];B[id])

(;W[tt]C[White plays elsewhere, a mistake.];B[mb];W[lb];B[kd]
C[White continues with 'a'. White 'b' is a mistake.]LB[nc:b][jc:a]
(;W[jc];B[na]
C[White must play 'a'. White 'b', Black 'a' and White is captured.]
LB[oa:b][nc:a];W[nc];B[oa]C[White is split in two.])

(;W[nc]C[White 18 is a mistake.];B[kb];W[nb];B[kc];W[ma]
C[Black has sente, and can take away White's second eye with 'a'.]
LB[oa:a])
)
)
)

(;B[nc]
C[Black 11 is not recommended. Blac gets two stones, White gets
superior thickness.]
;W[oe];B[pd];W[lc];B[lb];W[kc];B[nb];W[na];B[mb];W[kb];B[pb];W[ke])
)

(;W[lc]C[White 10 is not recommended.];B[lb];W[kc];B[nd];W[mb];B[nc];
W[kb];B[nb];W[la])
)

(;B[pb]C[Black 9 is a mistake.];W[oe]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nd:b][pe:a]
(;B[pe];W[nd]
C[If Black 'a', White 'b'. If Black allows White 'a', Black does
not have a good reply.]
LB[og:b][pd:a])

(;B[nd]C[Black 11 is stolid.];W[ne];B[nc];W[mc];B[nb])
)
)

(;W[nc]C[White 8 is not recommended.];B[oe];W[lc])

(;W[lc]
C[White 8 is the old joseki pattern. This play is less favorable
because White 8 onto the marked point would give White more territory.]
MA[ob];B[nc];W[mc]
C[Black should capture at 'a'. 'b' shows White's follow-up when
Black plays elsewhere.]
LB[dp:b][ob:a]
(;B[ob])

(;B[tt]C[Black plays elsewhere.];W[ob];B[nb];W[nd]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pb:b][oe:a]
(;B[oe];W[pb];B[qb];W[mb]
C[The capture is big, but Black has sente (and has played another
move elsewhere as well).])

(;B[pb]C[Black 15 gives White a favorable result.];W[oe];B[pd];W[qf]
C[White may continue here or elsewhere as fits the overall board
position.])
)
)

(;W[oe]
C[White 8 is not recommended, as it results in a relatively insecure
position for White.]
;B[nc];W[mc];B[ob]
C[White has an insecure position. Further, Black has a good follow-up
with a play at 'a'.]
LB[jd:a])
)

(;B[nc]C[Black 7 is a mistake.];W[mc];B[pc];W[jd])
)

(;W[pd];B[pe];W[pc]C[Black continues with 'a *' or 'b *'.]
LB[qc:b][nd:a]
(;B[nd]C[White continues with 'a *'. White 'b' is a mistake.]
LB[qc:b][qe:a]
(;W[qe]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[qf:b][qc:a]
(;B[qc];W[qb]C['A *' is correct, 'B' is inferior.]LB[re:B][rb:A]
(;B[rb];W[re];B[pb]
C[White continues with 'a *'. White 'b', a pattern that predates
White 'a', is an overplay.]
LB[rc:b][ob:a]
(;W[ob];B[qa];W[md];B[nc];W[mc];B[nb];W[pf];B[oe]
C[This joseki was a favorite of Kajiwara Takeo 9-dan.];W[of]
C[
* GOOD VARIATION *

Continuation, but White most often switches elsewhere.])

(;W[rc]C[White 16 is not recommended.];B[qa];W[rd];B[qb]
C[White continues with 'a'. White 'b' is a mistake.]LB[pf:b][md:a]
(;W[md];B[nc];W[pf];B[ob])

(;W[pf]C[White 20 is out of order.];B[oe];W[md];B[mc]
C[White continues with 'a'. White 'b' is not recommended.]
LB[lc:b][of:a]
(;W[of];B[nc])

(;W[lc];B[nc])
)
)
)

(;B[re];W[qf];B[rb];W[oe];B[pf];W[ne];B[nc]C[Later White A or B.]
LB[rf:B][pg:A])
)

(;B[qf]C[Black 11 is a mistake.];W[re];B[pf];W[rd];B[nc])
)

(;W[qc]
C[White 10 is inconsistent with the aim of sacrificing the three
stones in the corner for the outside.]
;B[re]C[White continues with 'a'. White 'b' is also possible.]
LB[rb:b][rd:a]
(;W[rd];B[qe];W[mb];B[md])

(;W[rb];B[of];W[mb];B[md])
)
)

(;B[qc]C['A *' or 'B'.]PL[2]LB[qe:B][mc:A]
(;W[mc];B[oe];W[md]C['A *' or 'C' for safety, 'B' to attack.]
LB[qi:C][nb:B][qg:A]
(;B[qg];W[id]C[
* GOOD VARIATION *])

(;B[nb];W[nc];B[lc])

(;B[qi];W[kb])
)

(;W[qe];B[nd]
C[Continuation see previous variation Black 11 before Black 9.]
LB[qc:9][nd:11])
)
)

(;W[nc]
C[White 6 is a bit slack from a shape standpoint, but it avoids
complications. White must have the ladder to play this way.

Black continues with 'a' or 'b'.]
LB[oe:b][pc:a]
(;B[pc];W[oe]C[Black continues with 'a' or 'b'.]LB[pe:b][nd:a]
(;B[nd];W[md];B[mc];W[ne];B[pd];W[lc];B[mb];W[lb];B[ob];W[ma];B[nb];
W[kd])

(;B[pe];W[of];B[pf];W[og];B[pg];W[oh];B[qi])
)

(;B[oe];W[pc];B[qc];W[le])
)

(;W[nd]C[White 6 is a mistake.];B[oe];W[pc];B[qc];W[le];B[jd];W[lc];
B[kc]C[White continues with 'a'. White 'b' is pathetic.]LB[md:b][lb:a]
(;W[lb])

(;W[md]C[White 14 is a mistake.];B[lb];W[kd];B[ke]
C[White can't afford to connect, but if he cuts anywhere, the ko
is so big that Black will ignore any ko threat.])
)
)

(;B[pf]
C[Black 5 emphasizes the right side. White continues with 'a *'
or 'b'. White 'c' is a bit unreasonable locally, but may make
strategic sense. White 'd' is a mistake.]
LB[le:d][jd:c][qc:b][md:a]
(;W[md]
C[Black continues with 'a *' or 'b'. Black 'b' is a tough-minded
move.]
LB[lc:b][qj:a]
(;B[qj]C[
* GOOD VARIATION *])

(;B[lc]C[White 7 shows fighting spirit.];W[mc];B[pc];W[jd]
C[A likely continuation.];B[ke];W[mg])
)

(;W[qc]
C[Black continues with 'a'. Black 'b' gives White a large corner
profit to questionable outside strength.]
LB[pd:b][rc:a]
(;B[rc];W[pd];B[qe];W[le];B[jd])

(;B[pd];W[pc];B[md]
C[White continues with 'a'. White 'b' is a mistake.]LB[od:b][nd:a]
(;W[nd];B[ne])

(;W[od];B[oe];W[ne];B[nd]
C[White 4 should be at 'a'. White is in for a rough ride.]LB[nf:a])
)
)

(;W[jd]
C[Black 'a' takes up the challenge, while Black 'b' is a steady
move that avoids fighting for the moment.]
LB[pc:b][le:a]
(;B[le];W[lf];B[ke]
C[Black 5 is an a good place to give White trouble.])

(;B[pc];W[od];B[ph])
)

(;W[le]C[White 6 gives Black a large corner.];B[nd];W[md];B[nc];W[mc];
B[nb]C[White 6 would be now be better placed at 'a'.]LB[jd:a])
)

(;B[qg]C[White 'a' and 'b' are possible continuations.]LB[pf:b][jd:a]
(;W[jd]
C[Because White retains forcing moves at 'a' and 'b', Black cannot
play 'c'.]
LB[nd:c][pf:b][pe:a])

(;W[pf];B[qf];W[qc];B[rc];W[pd];B[qe];W[jd]
C[If Black 'b', White 'c' is severe. Rather than fight where White
is strong, Black usually tries to settle himself with 'a'.]
LB[lf:c][le:b][jc:a];B[jc])
)

(;B[le]
C[There is no point in Black 5 unless he has the upper right corner,
but White does not make the shoulder hit unless he has strength
at the top left.]
;W[mf];B[lf]
C[White continues with 'a' or 'b'. White 'b' is a fighting move.]
LB[qf:b][mg:a]
(;W[mg];B[kh];W[qf];B[pc];W[pe];B[ob];W[nb];B[nc];W[od];B[mb];W[pb];
B[na];W[qc]AW[dd]
C[The result cannot be assessed without accounting for the top-left
corner. If White has the top-left star point, the result may
be considered equal. White has no reason for dissatisfaction
in this case. If Black 'a', White 'b' negates Black's thickness.

If Black has a favorable position at top-left, White has a tough
game ahead.]
LB[fe:b][fc:a])

(;W[qf];B[pe];W[pf];B[oe];W[md];B[of]
C[If White 'a', White risks losing the two White stones.]LB[mg:a];
W[mg];B[ph]
C[White is likely to attack the three Black stones at left.])
)

(;B[nd]C[Black 5 is a mistake.];W[pe];B[qe];W[pf];B[qg];W[md])

(;B[md]C[Black 5 is a mistake.];W[nd];B[ne];W[oe];B[nf];W[of];B[ng];
W[qf]
C[Although Black's corner stone retains some aji (potential), Black
must ensure capture of White 4 (possibly with a play at 'a').]
LB[lf:a])
)

(;W[md]
C[White makes a "belly attachment" to the Black pincer. Locally
the play is not advantageous, but may produce a reasonable whole
board result. 

Typically the result is a Black wall facing the left side (from
Black 3), with White emphasizing the top and right. This is consistent
with the proverb "attaching to a stone makes it stronger".

Black continues with 'a *' to 'c'.]
LB[me:c][mc:b][le:a]
(;B[le];W[me];B[lf]C[White continues with 'a *' or 'b'.]LB[mf:b][qf:a]
(;W[qf];B[pc];W[pe];B[ob];W[nb];B[nc];W[od];B[mb];W[pb];B[na];W[qc]
C[
* GOOD VARIATION *

The joseki ends, but Black retains the play at 'a'. Black may
also play elsewhere ('b').]
LB[dp:b][qb:a]
(;B[qb];W[pd]
C[Black 'a' diminishes White's corner. Black 'b' is most tenacious.]
LB[rc:b][pa:a]
(;B[pa];W[rb];B[pc];W[rc])

(;B[rc];W[pc];B[pa];W[rb];B[ra]
C[Black gets a "flower-viewing" ko (nothing to lose).])
)

(;B[tt]C[Black plays elsewhere. White may try 'a'.]LB[lc:a];W[lc]
C[Black continues with 'a' or 'b'.]LB[mc:b][kc:a]
(;B[kc]C[White must play 'a'. White 'b' is hopeless.]LB[lb:b][mc:a]
(;W[mc];B[lb])

(;W[lb]C[White 22 is a mistake.];B[mc];W[kb];B[jc];W[jb];B[ib])
)

(;B[mc];W[kc];B[jd])
)
)

(;W[mf]C[Black continues with 'a'. Black 'b' is timid.]LB[qg:b][lg:a]
(;B[lg];W[qf];B[pc];W[ob]
C[Black 'a' is solid. Black 'b' provokes a fight.]LB[pf:b][pb:a]
(;B[pb];W[pe];B[rf]C[White continues with 'a' or 'b'.]LB[re:b][rg:a]
(;W[rg];B[re];W[qh])

(;W[re];B[qe];W[rd];B[pf]
C[White continues with 'a'. White 'b' is not recommended.]
LB[pd:b][qg:a]
(;W[qg];B[oe];W[pg];B[od];W[lc];B[kc];W[of];B[rc];W[rg];B[mc];W[nc];
B[mb];W[nd])

(;W[pd]C[White 20 is a mistake.];B[qg];W[qc];B[qf];W[qb];B[mg]
C[Black 25 is a superb point. White's corner is small, and Black's
influence commanding.])
)
)

(;B[pf];W[pe];B[qe];W[pg];B[of];W[qg];B[oe];W[od];B[pd];W[og];B[ng];
W[nf];B[pb];W[mg];B[nh];W[mh];B[ni];W[pj];B[nk]
C[Fighting continues from here.])
)

(;B[qg]C[Black 9 is a mistake.];W[lc];B[kc];W[lg];B[kg];W[kh]
C[Black thickness has been erased.])
)
)

(;B[mc]C[White continues with 'a' or 'b'.]LB[me:b][nd:a]
(;W[nd])

(;W[me];B[nc];W[od])
)

(;B[me]C[White continues with 'a', possbily 'b'.]LB[pe:b][nd:a]
(;W[nd];B[le]
C[White continues with 'a'. White 'b' is not recommended.]
LB[of:b][pe:a]
(;W[pe];B[qe];W[pg];B[pf];W[of];B[qf];W[qg];B[og];W[nf];B[oh];W[qi]
C[Black can play 'a', taking th corner, but 'b' is even stronger.]
LB[pi:b][pc:a]
(;B[pc];W[mg])

(;B[pi];W[rh];B[rg];W[qh];B[mg]
C[White continues with 'a'. White 'b' is premature.]LB[qb:b][lc:a]
(;W[lc]C[White 24 is essential.];B[kc];W[qb];B[rb];W[pb];B[ra];W[mb]
C[A possible continuation.];B[lb];W[mc]
C[Black continues with 'a'. Black 'b' is a serious mistake.]
LB[dp:b][rf:a]
(;B[rf];W[pj];B[mh]
C[White may extend down the right side, while Black plays at 'a'.]
LB[jd:a])

(;B[tt]C[Black plays elsewhere, a grievous error.];W[rc];B[qc];W[sb];
B[rd];W[sc]C[Black must play 'a'. Black 'b' is a mistake.]
LB[sd:b][sf:a]
(;B[sf])

(;B[sd]C[Black 38 is a mistake.];W[rf]C[Black dies with one eye.])
)
)

(;W[qb]C[White 24 is a mistake.];B[pc];W[pb];B[od]
C[White 'a' loses only three stones. White 'b' loses them all.]
LB[ne:b][nb:a]
(;W[nb];B[ne])

(;W[ne];B[nc];W[ob];B[mc];W[lc];B[lb];W[kc];B[mb]
C[Black is one liberty ahead (that's all it ever takes).])
)
)
)

(;W[of];B[qg]
C[White has a difficult position. Black has a share of the corner
and side, and thickness on the outside. Meanwhile, White will
struggle while Black profits at tormenting White.

If White had played 8 (the two-space jump), and Black responded
with 9, White would not have played 4, attaching to the pincer
stone (3). Instead, White would have played a pincer (such as
'a').]
LB[id:a])
)

(;W[pe];B[qe]
C[White continues with 'a'. White 'b' is also possible, though
strategically advanced.]
LB[pg:b][pf:a]
(;W[pf];B[qf];W[pg];B[nd];W[qg];B[mc];W[od];B[qb]
C[White continues with an extension or approach move on the right
side.])

(;W[pg]AB[cp][eq][ce]AW[dc][oq][qp]
C[1967 (6th) Meijin Title, Game 3: White: Sakata Eio, Honinbo;
Black: Rin Kaiho, Meijin]
;B[qf];W[mc]C[Black continues with 'a'. If Black 'b'....]
LB[pf:b][fd:a]
(;B[fd]
C[White continued with 'a', avoiding a disadvantageous fight with
'b'.]
LB[de:b][ed:a]
(;W[ed]
C[1967 (6th) Meijin Title, Game 3: White: Sakata Eio, Honinbo;
Black: Rin Kaiho, Meijin - continued]
;B[ee];W[de];B[df];W[dd];B[ef];W[cf];B[be];W[bf];B[bc];W[cc];B[ch];
W[bd];B[cg];W[ae];B[jp];W[dm];B[ge];W[le];B[pf];W[ne];B[mq];W[eo];
B[gp];W[go];B[hp];W[cn];B[do];W[dn];B[ck];W[dk];B[dj];W[ej];B[ek];
W[dl];B[fj];W[ei];B[gk];W[cj];B[di];W[bj];B[qn];W[ql];B[on];W[nq];
B[mp];W[qb];B[qi];W[pi];B[qh];W[pj];B[pp];W[qq];B[mf];W[ke];B[nd];
W[jc];B[qj];W[ol];B[nj];W[nk];B[qo];W[po];B[op];W[np];B[oo];W[pq];
B[mj];W[mk];B[mo];W[lj];B[li];W[ki];B[mh];W[kj];B[od];W[nc];B[pc];
W[pb];B[bo];W[lh];B[mi];W[no];B[nn];W[pm];B[pn];W[mm];B[qk];W[pk];
B[nr];W[or];B[mr];W[rp];B[mn];W[fl];B[fk];W[hh];B[gh];W[mg];B[ng];
W[lg];B[nf];W[ph];B[nh];W[dq];B[ep];W[dp];B[co];W[cq];B[bq];W[br];
B[ar];W[dr];B[cs];W[rk];B[hg];W[ig];B[ih];W[hi];B[hf];W[qg];B[rg];
W[rj];B[rh];W[jh];B[jd];W[kd];B[ic];W[jb];B[ib];W[id];B[rm];W[rl];
B[fo];W[en];B[if];W[jg];B[fb];W[bn];B[cr];W[rc];B[bk];W[sf];B[rd];
W[sd];B[se];W[re];B[rf];W[se];B[qc];W[sc];B[oi];W[ak];B[ca];W[eb];
B[ea];W[fc];B[gb];W[gc];B[hc];W[ia];B[hd];W[bb];B[gn];W[kn];B[ij];
W[ii];B[ln];W[lm];B[ko];W[jn];B[jl];W[in];B[il];W[kl];B[bg];W[cd];
B[bi];W[ao];B[bp];W[bl];B[ro];W[os];B[sp];W[sq];B[so];W[rr];B[rb];
W[ra];B[ha];W[ja];B[ba];W[fa];B[da];W[gi];B[fi];W[gl];B[hl];W[oj];
B[oh];W[ie];B[el];W[fm];B[io];W[hn];B[ho];W[jj];B[sl];W[jk];B[hk];
W[ns];B[ms];W[lf];B[jf];W[je];B[gd];W[ec];B[fn];W[hm];B[of];W[kf];
B[nm];W[nl];B[ci];W[cl];B[ai];W[ag];B[ah];W[cb];B[hb];W[an];B[bs];
W[ap];B[aq];W[af]C[Black wins by 6 points.])

(;W[de]C[This fight would be difficult for White.];B[dd];W[ed];B[cd]
C[Black will lead the fighting to the right, where he can effectively
use a connection at 'a'.]
LB[le:a])
)

(;B[pf];W[ne])
)
)
)
)

(;W[qf]
C[The White pincer puts pressure on Black 1 to settle White 2.
Black usually answers at 'a *', but 'b' is possible.]
LB[pe:b][od:a]
(;B[od]C[White continues with 'a' or 'b *'. 'c' is a mistake.]
LB[pd:c][nd:b][pc:a]
(;W[pc];B[pd];W[qc]C[Black continues with 'a' to 'c'.]
LB[rc:c][nc:b][nd:a]
(;B[nd]C[White continues with 'a' or 'b'.]LB[pj:b][mb:a]
(;W[mb];B[qj])

(;W[pj]
C[If White wants to prevent Black from extending on the right side,
he plays 10.]
;B[nc];W[rd];B[re];W[rc];B[qe])
)

(;B[nc];W[nb];B[mb];W[mc];B[nd];W[lb];B[md];W[ma];B[pj])

(;B[rc]
C[Black takes a territory oriented approach, and gets a little
thin in doing so.]
;W[rb];B[rd];W[lb];B[qj])
)

(;W[nd]
C[White gets a bit greedy with 6, as he aims at also living in
the corner.]
;B[oe];W[pc];B[qe]
C[White continues with 'a *'. White 'b' leads to bad shape.]
LB[ne:b][qc:a]
(;W[qc]C[Black continues with 'a *' or 'b'.]LB[qj:b][ne:a]
(;B[ne]C[White extends to 'a *', possibly 'b' or 'c'.]
LB[qj:c][pk:b][pj:a]
(;W[pj]C[
* GOOD VARIATION *];B[nc]C[Continuation.];W[nb];B[mc];W[mb];
B[lb];W[kc];B[lc]PL[2];B[rc]
C[Later, Black can threaten the life of the White group.];W[rb];B[sb];
W[ra];B[re];W[pa])

(;W[pk]AB[po][cp]AW[de][pq]
C[1972 9th Pro Best Ten Playoff, Game 3 - White: Yoshio Ishida;
Black: Iwata

White played 12, stretching the extension from 4 to pincer the
Black stone in the lower right corner.]
;B[pi]
C[Black 13 surprised White, who expected Black to pincer around
'a'.]
LB[nq:a];W[np])

(;W[qj])
)

(;B[qj];W[ne]
C[Black 11 prevents White from making the first play down the right
side.]
;B[og];W[nf];B[pg];W[id])
)

(;W[ne];B[nf];W[me];B[qc]C[Black 13 robs White of his base.])
)

(;W[pd];B[pe];W[pc];B[qe];W[nd];B[oe])
)

(;B[pe];W[pf]C[Black continues with 'a'. Black 'b' is weak.]
LB[oe:b][of:a]
(;B[of];W[og];B[oe];W[ph]
C[Black must decide how to tackle the corner. 'a' is solid, but
lets White play under Black 3. Black 'b' is another possibility.]
LB[mc:b][pb:a]
(;B[pb];W[lb])

(;B[mc];W[rc];B[rd];W[qb]
C[Black continues with 'a' or 'b'. In either case, White can live
in the corner (at least through ko) or get to the center.]
LB[nb:b][qc:a]
(;B[qc]C[White continues with 'a'. White 'b' and White dies.]
LB[rb:b][ra:a]
(;W[ra]C[Black 'a' for a ko. Black 'b' and White lives.]LB[sb:b][sc:a]
(;B[sc];W[sb])

(;B[sb]C[Black 17 is a mistake. White lives.];W[sc])
)

(;W[rb];B[nb]C[White dies.])
)

(;B[nb];W[ob];B[pc];W[pb];B[ra]
C[Black 19 takes away eye shape, but White can play 'a', as 'b'
and 'c' are sente for White. The position for fighting in the
center determines the outcome.]
LB[od:c][nc:b][ne:a])
)
)

(;B[oe]C[Black 7 shows a lack of fighting spirit.];W[of];B[ne]
C[White can emphasize the side with 'a', or live in the corner
with 'b'.]
LB[rc:b][qj:a]
(;W[qj];B[mc]
C[White 'a' is sente, and White can reduce the corner with 'b'.]
LB[rd:b][kc:a])

(;W[rc];B[rd];W[qc];B[mc];W[nb];B[pj];W[mg])
)
)
)

(;W[qg]
C[White should have the ladder to play the two-space pincer. Black
can answer at 'a *' or 'b *'.]
LB[pe:b][od:a]
(;B[od]
C[White continues with 'a', 'b *' or 'c *'. White plays 'a' as
part of a fuseki strategy; locally it is a loss. White plays
'b' with a favorable ladder.]
LB[nd:c][pd:b][qj:a]
(;W[qj]
C[White 6 if it helps the lower right, but this results in a loss
in the local context of the joseki.]
;B[pc])

(;W[pd]
C[Black continues with 'a *'. If Black plays 'b' when the ladder
favors White, Black is sadly mistaken.]
LB[pc:b][pe:a]
(;B[pe];W[pc]C['A *' or 'B'.]LB[oe:B][re:A]
(;B[re]
C[White continues with 'a *', 'b *' or 'c'. White 'd' is a mistake.]
LB[nd:d][mc:c][md:b][nc:a]
(;W[nc]
C[Black continues with 'a' or 'b *'. Black 'c' is not recommended.]
LB[qc:c][nd:b][me:a]
(;B[me];W[rc]
C[White can aim at the severe move at 'a'. Black probably needs
an immediate reinforcement at 'b'.]
LB[og:b][ne:a])

(;B[nd];W[md];B[me];W[mc]
C[Black continues with 'a *'. Black 'b' is an overplay, as the
White cut at 'a' presents difficulty.]
LB[lc:b][le:a]
(;B[le]
C[White continues with 'a *'. White 'b' is possible, at a cost.]
LB[pk:b][kb:a]
(;W[kb];B[pj]C[
* GOOD VARIATION *])

(;W[pk];B[lc];W[rb];B[rc];W[sb];B[mb]
C[White continues with 'a'. White 'b' is a mistake.]LB[nb:b][qb:a]
(;W[qb]C[Black 'a' is sente.]LB[kb:a])

(;W[nb]C[White 22 is a mistake.];B[qb];W[qc];B[pb]
C[White cannot live.])
)
)

(;B[lc];W[le];B[ne];W[lb];B[kb];W[ma];B[jc];W[rc];B[pj];W[oh])
)

(;B[qc];W[oe];B[pf];W[ne])
)

(;W[md]C[Black continues with 'a' or 'b'.]LB[le:b][nd:a]
(;B[nd]C[White continues with 'a' or 'b'.]LB[mc:b][nc:a]
(;W[nc];B[me];W[mc];B[le];W[kb])

(;W[mc];B[me]
C[White continues with 'a' or 'b'. White 'b' is played only if
the right side is important.]
LB[lc:b][lb:a]
(;W[lb]C[Black continues with 'a' or 'b'.]LB[pj:b][le:a]
(;B[le]C['a' and 'b' are miai.]LB[jc:b][qc:a];W[pk])

(;B[pj]
C[If Black values the lower right enough to suffer the cut at 'a'.]
LB[le:a];W[le];B[mf];W[ke])
)

(;W[lc]
C[Black continues with 'a' for thickness or 'b' to take a vital
point on the right side.]
LB[le:b][kd:a]
(;B[kd];W[kc];B[jd];W[pk])

(;B[le];W[kc];B[pj])
)
)
)

(;B[le];W[oe]C[Black continues with 'a' or 'b'.]LB[of:b][pf:a]
(;B[pf];W[mf])

(;B[of];W[ne];B[nf];W[pf];B[qe];W[ph];B[mc];W[nc];B[qc];W[lb]
C[The result cannot be fully evaluated in the local context.])
)
)

(;W[mc]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[lc:b][ne:a]
(;B[ne];W[lc];B[kd];W[kc];B[jd];W[pk];B[jc])

(;B[lc]C[Black 11 is not recommended.];W[oe]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nd:b][pf:a]
(;B[pf];W[nd]C[White has the initiative.])

(;B[nd]C[Black 13 is a mistake.];W[md];B[ne];W[me]
C[White plays 16. White avoids playing the atari at 'a'.]LB[pf:a])
)
)

(;W[nd]
C[White 10 demonstrates an ignorance of the principles of Go. White
is easily forced into bad shape.]
;B[oe];W[ne];B[nf];W[me];B[qc];W[mc]
C[Black follows up locally with 'a'.]LB[og:a])
)

(;B[oe];W[qe];B[qf];W[re];B[rf];W[rd];B[pg])
)

(;B[pc]C[Black 7 is a mistake.];W[pe];B[nc];W[qc];B[ob]
C[White continues with 'a'. White 'b' is ko food.]LB[pb:b][qb:a]
(;W[qb]C[If later Black 'a', White must give way with 'b'.]
LB[qf:b][pf:a])

(;W[pb])
)
)

(;W[nd];B[oe];W[pc];B[qc];W[ne]
C[Black continues with 'a *'. Black 'b' is a mistake.]LB[nf:b][pg:a]
(;B[pg]C[White continues with 'a *' or 'b'.]LB[le:b][mf:a]
(;W[mf];B[ph]C[
* GOOD VARIATION *])

(;W[le];B[ke];W[lf];B[kd];W[qh];B[nf];W[md];B[jg];W[lh])
)

(;B[nf]C[Black 11 is a mistake.];W[mf]
C[Black 'a' is no good. Black 'b', slightly better.]LB[ng:b][me:a]
(;B[me];W[of]C[Black may try 'a' or 'b'.]LB[ng:b][nc:a]
(;B[nc];W[ng];B[md];W[nf];B[pd];W[mc];B[nb];W[mb];B[pb];W[kc]
C[The White atari at 'a' should be saved as a ko threat, as it
is playable anytime.]
LB[na:a])

(;B[ng];W[pd];B[pe];W[qe];B[pf];W[pg];B[og];W[qf];B[of];W[nc]
C['a' and 'b' are miai for White.]LB[qb:b][lc:a])
)

(;B[ng];W[le];B[mg];W[lg];B[lh];W[kg]C[White has nice shape.])
)
)
)

(;B[pe]
C['A *' is joseki, 'B' only, if White is strong on the top side.]
LB[qb:B][qj:A]
(;W[qj]C[Black continues with 'a *' or 'b'.]LB[nd:b][pc:a]
(;B[pc]C[
* GOOD VARIATION *])

(;B[nd]C[White can live with 'a', and the side is open at 'b'.]
LB[lb:b][qb:a])
)

(;W[qb];B[rb];W[oe];B[pg];W[qc];B[rc];W[pd];B[qe];W[of];B[qh])
)
)

(;W[pg]
C[The choice between the low and high two-space counter pincer
makes a big difference in later play. 

Black can answer at 'a *' or 'b'.]
LB[pe:b][od:a]
(;B[od]C[White continues with 'a *'. White 'b' is a mistake.]
LB[nd:b][pd:a]
(;W[pd];B[pe];W[pc]
C[Black continues with 'a *' or 'b'. Black 'a' is unique with the
high pincer (compared to the low, where Black must play 'b').
Black 'c' keeps the position simple at a cost.]
LB[oe:c][re:b][qc:a]
(;B[qc]C[White continues with 'a *'. White 'b' is an old pattern.]
LB[oe:b][qb:a]
(;W[qb]C[Black continues with 'a *'. Black 'b' is an overplay.]
LB[rb:b][qf:a]
(;B[qf]C['A' or 'B'.]LB[mc:B][rb:A]
(;W[rb];B[nd];W[nb];B[rh]C[
* GOOD VARIATION *])

(;W[mc];B[nd];W[md];B[me];W[nc];B[le];W[rb];B[rh])
)

(;B[rb]C[Black 11 is a mistake.];W[qe];B[oe];W[pb];B[re];W[qf];B[rf];
W[rg];B[qh];W[qg];B[ra]
C[Black lives. Now White must settle his stones at top.]
(;W[md];B[me];W[mc];B[lc];W[lb];B[kb];W[nb];B[la];W[mb];B[le];W[jc];
B[kc];W[nf];B[ne]C[White gets a slightly better result.])

(;W[mc]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[md:b][lc:a]
(;B[lc];W[md];B[me];W[lb];B[kb];W[nb];B[la];W[mb];B[le];W[jc];B[kc];
W[nf];B[ne])

(;B[md]C[Black 23 looks better than it is.];W[lb])
)
)
)

(;W[oe];B[pf];W[nd];B[of]
C[White continues with 'a' or 'b'. White 'b' tries to avoid giving
Black such great shape on the right side.]
LB[me:b][nf:a]
(;W[nf];B[og]C[This pattern is considered to favor Black.])

(;W[me];B[qg])
)
)

(;B[re]C[White continues with 'a' or 'b'.]LB[nd:b][md:a]
(;W[md];B[le]
C[White continues with 'a'. White 'b' is a mistake, failing to
account for the high White pincer at 4.]
LB[oe:b][lc:a]
(;W[lc];B[kc];W[mc];B[jd])

(;W[oe];B[of];W[ne];B[pf])
)

(;W[nd]C[White 10 is an exception - usually this atari is a mistake.];
B[oe];W[md]C[Black continues with 'a' or 'b'.]LB[me:b][le:a]
(;B[le]C[White continues with 'a' or 'b'.]LB[nf:b][mf:a]
(;W[mf];B[me];W[ne];B[nf]
C[White continues with 'a'. White 'b' is a mistake.]LB[mg:b][lc:a]
(;W[lc];B[kc];W[mb];B[jd]C[It is better not to give atari at 'a'.]
LB[lb:a])

(;W[mg]C[White 18 is a mistake, as it is not sente.];B[lc]
C[If White 'a', Black 'c'. The result is terrible for White.]
LB[nc:b][of:a];W[mb]C[White must play 20.];B[og];W[lb];B[kb];W[rb];
B[ph])
)

(;W[nf];B[ne];W[me];B[mf];W[lc];B[lf];W[ng];B[qc];W[mb])
)

(;B[me]C[White continues with 'a' or 'b'.]LB[lc:b][ne:a]
(;W[ne];B[nf];W[mf];B[le];W[lc];B[kc];W[mb];B[jd])

(;W[lc];B[ne];W[kd];B[le];W[jc]
C[If Black plays 'a', White replies 'b' and connects.]LB[qb:b][qc:a])
)
)
)

(;B[oe];W[qe]
(;B[qf];W[re];B[qg];W[rd];B[ph])

(;B[qc];W[qb];B[rb];W[pb]
C[Same position as Black 11, White 12, Black 13, White 14 played 
before Black 9, White 10, see there for continuation.]
LB[pb:14][rb:13][qb:12][qc:11][qe:10][oe:9])
)
)

(;W[nd]C[White 6 is pointless with the high pincer.];B[oe];W[pc]
C[Black continues with 'a' or 'b'.]LB[qc:b][ne:a]
(;B[ne]
C[White may try 'a' or 'b'. With White 6, the damage is already
done.]
LB[pd:b][qc:a]
(;W[qc];B[qf];W[qg];B[nc];W[nb];B[mc];W[mb];B[lb];W[kc];B[lc];W[dp]
C[White plays elsewhere.];B[rg];W[rh];B[rc];W[rb];B[re];W[sc]
C[White 26 is absolutely necessary. If the ladder is favorable,
Black cuts at 'a', otherwise can peep at 'b'.]
LB[qi:b][qh:a])

(;W[pd];B[pe];W[qe];B[re];W[qf];B[qc];W[qb];B[rb];W[pb];B[rf];W[rg];
B[qh];W[qg];B[ra]
C[This sequence so far is forced. Clearly White 6 would be better
placed at 'a'. White has no good way to settle the top group
of stones.]
LB[md:a];W[lb];B[kb];W[kc];B[lc];W[jb];B[mb];W[ka];B[nc]
C[The White stones are captured; the continuation shows Black's
vain attempt to save them.]
;W[nb];B[mc];W[ma];B[pa]
C['a' and 'b' are miai; the White stones are history.]LB[ob:b][na:a])
)

(;B[qc];W[ne];B[qf]
C[Black 11 is a possible continuation. Black later aims at 'a'
and the cutting point 'b'.]
LB[nc:b][nf:a])
)
)

(;B[pe]C[White continues with 'a'. White 'b' is too slow.]
LB[nd:b][me:a]
(;W[me]
C[White 6 is the tesuji for settling his stones.

Black continues with 'a'. Black 'b' takes the bait. Black 'c'
is not recommended either.]
LB[og:c][nd:b][le:a]
(;B[le];W[mf];B[pc];W[lf])

(;B[nd]C[Black 7 is a mistake.];W[md];B[nc];W[mc];B[nb];W[ne];B[mb];
W[lc];B[oe];W[ng]
C[In the early game, White's strength exceeds Black's profit.])

(;B[og]C[Black 7 is not recommended.];W[oh];B[of];W[md];B[ph];W[pi];
B[qh];W[qi];B[rg];W[rh];B[qg]C['A' or 'B'.]LB[lc:B][nh:A]
(;W[nh]C[Black 'a' is possible, but provoking White 'b' is not good.]
LB[le:b][mf:a])

(;W[lc])
)
)

(;W[nd]C[White 6 is slow.];B[of]
C[After Black 7, White 6 clearly would be better at the marked 
point.]
MA[md];W[le];B[ke];W[me];B[pc];W[kd];B[jd];W[kc];B[jc];W[lb];B[kb];
W[lc]
C[White is overconcentrated and has not done well.
The shape of the White group is the same of a Black group after a Black mistake after White plays 10 instead of 6.
]
LB[me:10][nd:6])
)
)

(;W[tt]C[White plays elsewhere. 

Black continues with 'a *' or 'b'.]
LB[od:b][pc:a]
(;B[pc]C[White continues with 'a *' or 'b'.]LB[pe:b][od:a]
(;W[od];B[pf]C[White continues with 'a *' or 'b'.]LB[me:b][ne:a]
(;W[ne]C[Black continues with 'a *' to 'c'.]LB[qi:c][mf:b][ph:a]
(;B[ph]
C[White plays 'a *' if a ladder to the lower left is not favorable.
If White has a favorable ladder to the lower left, White continues
with 'b'.]
LB[le:b][mf:a]
(;W[mf];B[id]C[
* GOOD VARIATION *])

(;W[le]C[White must have the ladder to play this way.];B[ke];W[kd];
B[lc];W[je];B[kf];W[lf];B[jd];W[kc]
C[Black continues with 'a' if the ladder to capture Black 11, 15
is favorable to Black, or 'b' if the ladder is unfavorable.]
LB[mb:b][jc:a]
(;B[jc]C[Black must have the ladder to play this way.];W[kb];B[lb];
W[jb];B[ib];W[ic];B[id];W[ie];B[hd];W[kg])

(;B[mb];W[jc];B[ob];W[lg]C[Black has failed.])
)
)

(;B[mf]
C[White continues with 'a'. White 'b' leaves Black a step ahead.]
LB[nf:b][og:a]
(;W[og];B[pg]
C[White continues with 'a'. White 'b' can leave White with bad
shape or a ko.]
LB[mg:b][oh:a]
(;W[oh];B[qi];W[mg];B[lg];W[mh])

(;W[mg]C[White 11 is not recommended.];B[lg]
C[White 'a' leads to bad shape, White 'b' to ko.]LB[nf:b][mh:a]
(;W[mh];B[nf];W[of];B[pe];W[oe];B[oh];W[ng];B[lf])

(;W[nf]C[White must fight a ko.];B[mh];W[nh])
)
)

(;W[nf]C[White 9 is hopeless.];B[mg];W[ng];B[mh]
C[If now White 'a', Black 'b'.]LB[qf:b][qe:a])
)

(;B[qi]C[Black 8 is a bit loose, but playable.];W[id];B[lf];W[ng])
)

(;W[me];B[le];W[mg]
C[Black continues with 'a'. Black 'b' lets White settle his stones.]
LB[ph:b][lf:a]
(;B[lf];W[mf];B[md];W[of];B[pe];W[oe];B[ph];W[lg])

(;B[ph]C[Black 10 is not recommended.];W[lf])
)
)

(;W[pe]
C[Black continues with 'a'. Black 'b' lacks fighting spirit. 'c'
is possible, esp. with the ladder.]
LB[od:c][qe:b][pd:a]
(;B[pd];W[oe]C[Black continues at 'a' or 'b'.]LB[qe:b][od:a]
(;B[od];W[qe];B[ne];W[nf];B[me])

(;B[qe]C['a' and 'b' are miai.]LB[pg:b][od:a]
(;W[od];B[pg])

(;W[pg];B[od])
)
)

(;B[qe]C[Black 6 is a mistake.];W[pb];B[qb];W[pd];B[qc];W[pf])

(;B[od];W[pd];B[qc];W[nd])
)
)

(;B[od]
C[White can respond with 'a' or 'b'. A favorable ladder is required
for 'b'.

White 'c' is not recommended.]
LB[nd:c][pd:b][pc:a]
(;W[pc];B[pd];W[qc];B[nc];W[nb]C[Black continues with 'a' or 'b'.]
LB[mb:b][mc:a]
(;B[mc];W[mb];B[lb];W[kc];B[lc])

(;B[mb]C[Black plays this way to get sente.];W[mc];B[nd];W[lb]
C['a' and 'b' are Black's continuations, but playing this way immediately
is a waste (use the other variation if Black doesn't want sente).]
LB[rc:b][lc:a])
)

(;W[pd]C[White must have the ladder to play this way.];B[pe];W[pc]
C[Black continues with 'a' or 'b'.]LB[qc:b][nd:a]
(;B[nd]
C[White continues with 'a' or 'b'. White plays 'b' to sacrifice
the three stones for a position on the right side.]
LB[qe:b][qc:a]
(;W[qc];B[re];W[rb]
C[If White plays 12 at 'a', Black 'b' is sente, which is painful.
Giving atari at 'c' destroys the future potential here.]
LB[rd:c][nc:b][rc:a])

(;W[qe]
C[The idea is to sacrifice the three White stones in order to settle
on the right.]
;B[qc];W[qb];B[rb];W[re];B[pb];W[rc];B[qa];W[rd];B[qb];W[pf];B[oe];
W[qi])
)

(;B[qc]
C[White plays 'a' to save the three stones, or 'b' to sacrifice
the three stones for position on the right side.]
LB[qe:b][mc:a]
(;W[mc]C[White saves his three stones with 10.];B[ne];W[lc];B[kd];
W[kc];B[jd];W[ic];B[qj]
C[Black builds a large framework, but has played two extra moves
to do so.])

(;W[qe]C[White sacrifices his three stones with 10.];B[oe];W[qb];B[rb]
;W[re];B[pb];W[rc];B[qa];W[rd];B[qb];W[qh];B[nc])
)
)

(;W[nd]C[White 6 leads to bad shape.];B[oe];W[pc];B[qc];W[ne];B[nf]
C[White must play 'a'. White 'b' is unreasonable.]LB[mf:b][me:a]
(;W[me];B[of])

(;W[mf]C[White 11 is unreasonable.];B[me]
C[White can only play 'a'. White 'b' doesn't work.]LB[of:b][nc:a]
(;W[nc];B[of];W[lc];B[lf];W[kc];B[mg]
C[Black's outward strength is winning.])

(;W[of]C[White 13 is reckless.];B[ng];W[pd];B[pe];W[qe];B[pf];W[qf];
B[pg];W[qb];B[rb];W[pb];B[qg];W[re];B[sd]
C[Black 27 is the tesuji to save the stones, along with 29.];W[rg];
B[sf]C['a' and 'b' are miai.]LB[rh:b][rf:a]
(;W[rf];B[rh])

(;W[rh];B[rf])
)
)
)
)
)

(;W[lb]
C[White 4 indicates a special strategy.

Black continues with 'a'. Black 'b' is not recommended.]
LB[jc:b][nd:a]
(;B[nd];W[od];B[oe]
C[White continues with 'a'. White 'b' is not recommended, as White
cannot get outside.]
LB[pe:b][nc:a]
(;W[nc];B[pe];W[nf])

(;W[pe]
C[White 8 is not recommended, as White makes no progress getting
outside.]
;B[pd];W[ne];B[of];W[md];B[me];W[nc];B[nf])
)

(;B[jc]C[Black 5 is loose, allowing White ready access to the center.]
;W[oe];B[pf];W[qc];B[rc];W[qb];B[pd];W[od])
)

(;W[ne]
C[White 4 is not recommended.

Black replies with 'a'. Black 'b' is loose.]
LB[pf:b][pe:a]
(;B[pe]
C[Black 5 aims to cut.

White must play 'a' to ensure connection. White 'b' is a mistake.]
LB[qb:b][oe:a]
(;W[oe]
C[White must ensure connection by playing 6, showing White 4 as
slow.]
;B[pg])

(;W[qb]C[White 6 is a mistake.];B[nd];W[od];B[oe];W[md];B[me];W[nc];
B[nf]C[Black has wonderful thickness.])
)

(;B[pf]C[Black 5 gives away too much.];W[qc];B[rc];W[pd];B[qe];W[qb])
)

(;W[lc]C[Don't play this moce.];B[mc];W[md];B[nd];W[me];B[nc]
C['A' is necessary, activating the separated White stone on 'B'
is maling things worse.]
LB[pd:B][kd:A]
(;W[kd];B[ne];W[le])

(;W[pd];B[pe];W[qc];B[od];W[pc];B[qe]
C[White lives in the corner on 'A' or dies after 'B'. Both results
are a disaster.]
LB[kd:B][rc:A]
(;W[rc];B[kd])

(;W[kd];B[rc];W[rb];B[rd];W[sb];B[pa];W[ob];B[nb];W[oa];B[qb])
)
)

(;W[jc]C['A' or 'B'.]LB[od:B][pe:A]
(;B[pe];W[nd];B[ke];W[lb])

(;B[od];W[nd];B[oe];W[pc];B[qc];W[ne])
)
)

(;B[kd]
C[
Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia = 3-Space High Pincer
-----------------------------------------------------------------------------

The three-space high pincer is relatively recent (since the 1950s).
It is not often played, and not many definitive sequences have
been worked out.

The balance with the top-left corner is usually the main factor
in choosing this pincer.

White responds from 'a *', 'b *', 'c *', 'd *', 'e *', 'f *'
to 'i', and may play elsewhere 'h *'. 

White 'i' aims to fight.

i9, h8, g7, f6, e5, d4, c3, b2, a1
]
LB[mc:i][dp:h][qb:g][pg:f][pf:e][of:d][pe:c][pd:b][qc:a]
(;W[qc]C[White aim to settle quickly.];B[rc]
C[White continues with 'a *'. White 'b' is a mistake.]LB[rb:b][pd:a]
(;W[pd]C[Black continues with 'a *' or 'b'.]LB[qb:b][qe:a]
(;B[qe];W[qb];B[pg]C[
* GOOD VARIATION *])

(;B[qb];W[qe];B[pc];W[rd];B[qc];W[oe];B[ob];W[nc];B[mb])
)

(;W[rb]
C[White 6 is slow.

Black continues with 'a'. Black 'b' is mild. Black 'c' is also
a mistake.]
LB[qb:c][rd:b][pc:a]
(;B[pc];W[qb];B[pd];W[pb];B[od];W[nc];B[nd]
C[Black creates a powerful wall.])

(;B[rd];W[pb])

(;B[qb];W[pc];B[sb];W[rd];B[ra];W[qe]
C[This works even if the ladder does not favor White.];B[pd];W[oe]
C[White 14 lets White squeeze Black if there is an unfavorable
ladder.])
)
)

(;W[pd]C[Black continues with 'a *'. Black 'b' is unreasonable.]
LB[qc:b][qe:a]
(;B[qe];W[qc];B[rc];W[qb];B[pg]C[
* GOOD VARIATION *])

(;B[qc]C[Black 5 is a mistake.];W[qe]
C[Black continues with 'a'. Black 'b' is a mistake. 'c' is possible.]
LB[pe:c][qf:b][re:a]
(;B[re]
C[White continues with 'a' to take the corner, or 'b' to force
Black along to crawl along the second line (the 'line of defeat').]
LB[qf:b][rf:a]
(;W[rf];B[qf];W[pe];B[rg];W[rd];B[sf];W[rc]C[White takes the corner.])

(;W[qf];B[rf];W[qg])
)

(;B[qf]
C[Black 7 is a mistake.

White continues with 'a'. White 'b' fails to take advantage of
Black's mistake.]
LB[re:b][pe:a]
(;W[pe];B[re];W[rf]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[rd:b][rg:a]
(;B[rg];W[rd];B[sf];W[rc])

(;B[rd]C[Black 11 is slow.];W[qg];B[rb];W[pf]
C[White 14 leaves no bad aji.])
)

(;W[re]C[With White 8, White loses an opportunity to take advantage.];
B[pe];W[rf];B[oe];W[pc];B[qb];W[rd];B[nc])
)

(;B[pe];W[re];B[oe];W[pc];B[qb];W[rd];B[nc])
)
)

(;W[pe]
C[White 4 is a bit risky, though nothing happens if Black plays
'a' rather than the cut following 'b'.

Black continues with 'a *' or 'b'.]
LB[pd:b][qe:a]
(;B[qe];W[pf];B[qg];W[id]
C[
* GOOD VARIATION *

Black may continue with 'a'.]LB[ne:a])

(;B[pd]C[Black plays tough, planning to cut.];W[od];B[oe];W[pf]
C[White 8 is the only move.

Black continues with 'a'. Black 'b' is too mild.]
LB[ne:b][of:a]
(;B[of];W[pg];B[og];W[ph];B[pc];W[pb];B[qb];W[ob];B[rc];W[re];B[rd]
C[White continues with 'a'. 

White 'b' and 'c' are not recommended, as Black gets superior
thickness. White 'c' is better than 'b', but not by much.]
LB[md:c][lc:b][ne:a]
(;W[ne]C[White 20 is the strongest continuation.];B[oh];W[oi]
LB[lg:B][mh:A]
(;B[mh];W[le];B[ld];W[md];B[mf];W[me];B[pi]
C[White continues with 'a'. White 'b' is unreasonable.]LB[pj:b][qi:a]
(;W[qi];B[pj];W[qj];B[pk])

(;W[pj]
C[White 30 is a mistake. The five White stones on the right will
be captured.]
;B[qi];W[qj];B[rh]
C[Black 33 is the tesuji. White 'a' is the best White can do, but
not good enough. If White 'b', Black 'a'.]
LB[rg:b][rj:a];W[rj];B[rg];W[rf];B[qe];W[qf];B[sg];W[sf];B[ri])
)

(;B[lg])
)

(;W[lc]C[White 20 is not recommended.];B[oh];W[pi];B[ld];W[kc];B[jc];
W[jb];B[ib]C[To live, White gives Black considerable thickness.])

(;W[md]C[White 20 is not very good.];B[me];W[ld];B[le];W[kb];B[kc];
W[lb];B[ic];W[jb];B[ie])
)

(;B[ne]C[Black 9 is too mild.];W[qb];B[rf]
C[White can settle himself. The three-space pincer is too far to
be a weapon. White has an easy fight.]
;W[qg];B[rb];W[pb];B[rg];W[qi];B[rc];W[mc];B[rh];W[oi];B[og];W[qh];
B[le];W[kb])
)
)

(;W[of]
C[White 4 is natural. Variations are the same as other pincers.

Black continues with 'a *' or 'b *'.]
LB[oe:b][qg:a]
(;B[qg]C[White continues with 'a *' or 'b *'.]LB[ph:b][id:a]
(;W[id]C[
* GOOD VARIATION *];B[kf];W[oh];B[pi];W[pe];B[qe];W[kh];
B[ie];W[hd];B[jd];W[he];B[ig])

(;W[ph]C[Black may play joseki on 'A *'. 'B' is a mistake,]
LB[pg:B][qh:A]
(;B[qh];W[pi];B[qi];W[pj];B[qk];W[pe];B[qe];W[id]
C[
* GOOD VARIATION *])

(;B[pg];W[og];B[oh];W[pj];B[nh];W[qh];B[rh];W[ri];B[rg];W[mf]
C[The marked stone is now isolated.]TR[kd])
)
)

(;B[oe];W[ne];B[pe]C[White continues with 'a' or 'b *'.]LB[mc:b][nd:a]
(;W[nd];B[nf]
C[White must now decide what to do about White 4, the cut stone.
White 'a' is the better option. White 'b', the sacrifice, is
not recommended.]
LB[ld:b][og:a]
(;W[og];B[ng];W[oh];B[lf];W[qb];B[qg])

(;W[ld]C[White 10 is not recommended.];B[og];W[mf];B[ng];W[kc]
C[White's position is tenuous, compared to the result of the similar 
joseki after the pincer Black 3 being one line closer on 100, 
where 3 is captured not just made heavy.]
LB[ld:10][kd:3])
)

(;W[mc]C[White 8 avoids fighting.];B[nf];W[me];B[og];W[mf];B[ng]
C[
* GOOD VARIATION *

White may continue with 'a'.]LB[hd:a])
)
)

(;W[pf]C[White adopts the taisha. Black can play 'a *' or 'b'.]
LB[pe:b][od:a]
(;B[od];W[pd];B[pe];W[pc];B[qe];W[oe];B[nd];W[qc]
C[Black continues with 'a'. Black 'b' was recently played by Nie
9-dan, who reportedly liked the result he got.]
LB[re:b][qf:a]
(;B[qf];W[of];B[qh];W[mb])

(;B[re]AB[dq]AW[dd][pp]
C[The game setup where this variation occurred is shown for reference.
The colors are reversed from the actual game.]
;W[rc];B[of];W[ne];B[md];W[og];B[nf];W[me];B[le];W[mf];B[ng];W[nh];
B[mg];W[lf];B[pg];W[kf];B[nb];W[ob];B[id];W[lh];B[oh];W[gc])
)

(;B[pe];W[oe];B[qf]
C[White continues with 'a *'. White 'b' is an overplay.]LB[qg:b][pg:a]
(;W[pg];B[qg];W[ph]
C[Black continues with 'a *'. A Black jump to 'c' is premature.]
LB[qi:b][qh:a]
(;B[qh];W[pi];B[qj];W[id]C[
* GOOD VARIATION *])

(;B[qi]C[Black 11 is a mistake.];W[pd];B[qe];W[qc];B[rc];W[rb];B[qb];
W[pc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[sb:b][rd:a]
(;B[rd])

(;B[sb]C[Black 19 is a mistake.];W[qh];B[rh]
C[Depending upon the ladder, White can play 'a', threatening to
capture Black 11, or 'b', aiming for Black 15 or the five Black
stones.]
LB[ri:b][rg:a])
)
)

(;W[qg]
C[White 8 is a mistake.

Black continues with 'a'. Black 'b' is a mistake.]
LB[pg:b][od:a]
(;B[od]C[White may try 'a' or 'b'. Either results in a loss.]
LB[of:b][nd:a]
(;W[nd];B[of];W[pd];B[pg])

(;W[of];B[nd])
)

(;B[pg]C[White 9 is a mistake.];W[of];B[qh];W[rg];B[ph];W[qc];B[rf];
W[rd])
)
)
)

(;W[pg]C[The large taisha.];B[od]C[White continues with 'a *' or 'b'.]
LB[pd:b][nd:a]
(;W[nd];B[oe];W[pc]
C[Black continues with 'a *'. Black 'b' is not recomended.]
LB[qc:b][ne:a]
(;B[ne];W[md];B[me]C[White continues with 'a *' or 'b'.]LB[pd:b][qc:a]
(;W[qc]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[ld:b][mb:a]
(;B[mb]C[White continues with 'a *'. White 'b' is a mistake.]
LB[lc:b][nb:a]
(;W[nb];B[ld]C[
* GOOD VARIATION *];W[pj])

(;W[lc]C[White 14 is a mistake.];B[kc];W[lb];B[kb];W[la];B[ld];W[mc])
)

(;B[ld]C[Black 13 is a mistake.];W[mb])
)

(;W[pd];B[pe];W[qe]
C[Black continues with 'a'. Black 'b' keeps the situation simple,
but gives White superior profit.]
LB[qf:b][re:a]
(;B[re];W[qf];B[qc];W[qb];B[rb];W[pb];B[rf];W[rg];B[qh];W[qg];B[ra];
W[mb]
C[Black continues with 'a' through 'c', depending on the overall
situation.]
LB[pk:c][oi:b][kb:a])

(;B[qf]C[Black 15 is not recommended.];W[re];B[qg];W[rd];B[ph])
)
)

(;B[qc]
C[Black 9 is not recommended. White is conservative, and Black
gets the better of it. White 'b' is a light, flexible reply that
Black will have trouble answering.]
LB[le:b][mc:a]
(;W[mc];B[og];W[oh];B[ng])

(;W[le])
)
)

(;W[pd];B[pe];W[pc]
C[Black continues with 'a' or 'b'. 'a' is simple but a bit mild,
while 'b' is complicated.]
LB[qc:b][nd:a]
(;B[nd];W[qe];B[qf];W[re];B[pf];W[rd];B[og])

(;B[qc]C[White continues with 'a'. White 'b' is not recommended.]
LB[oe:b][mc:a]
(;W[mc];B[oe];W[qb];B[rb];W[me];B[og];W[oh];B[ng]
C[White 'a' and 'b' are possible continuations. White 'a' is simple,
White 'b' a strong move.]
LB[qe:b][lf:a]
(;W[lf];B[ph];W[pi];B[qh];W[qi];B[rg];W[rh];B[qg])

(;W[qe];B[pb];W[ob];B[qf];W[re];B[qa];W[qg]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[rf:b][lf:a]
(;B[lf]C[What should follow is not altogether clear.])

(;B[rf]C[Black 25 is a mistake.];W[pf];B[rd];W[of];B[nf];W[ne];B[se];
W[pi]
C[White looks forward to profitably tormenting the three Black
stones.])
)
)

(;W[oe]
C[White 10 is an old 2-space pincer joseki that is no longer considered
favorably.]
;B[pf]C[White continues with 'a'. White 'b' is reckless.]
LB[of:b][nd:a]
(;W[nd];B[of];W[me];B[qg])

(;W[of]C[White 12 is a mistake.];B[nd];W[qb];B[rf]
C['a' and 'b' are miai.]LB[og:b][rb:a])
)
)
)
)

(;W[qb];B[pf];W[mc];B[qj])

(;W[tt]C[White plays elsewhere.];B[pc];W[od];B[pf];W[md];B[ph]
C[
* GOOD VARIATION *])

(;W[mc]C['A' is correct, 'B' is a mistake.]LB[nd:B][pc:A]
(;B[pc];W[pe];B[qe];W[pf];B[ob];W[pd];B[nc];W[od];B[qb];W[nb];B[nd];
W[oa];B[pb];W[ne];B[md];W[ld];B[me];W[le];B[mf];W[lb];B[og];W[qh]
C[Black 'A' doesn't work.]LB[pg:A];B[pg];W[qf];B[qg];W[rg]
C['A' or 'B' don't help,]LB[rh:B][rf:A]
(;B[rf];W[re];B[rh];W[sf];B[qi];W[rc])

(;B[rh];W[re];B[rd];W[ri])
)

(;B[nd]
C['A' is the correct punishment. 'B' is disadvantageous. 'C' is
nonsense.]
LB[md:C][od:B][nc:A]
(;W[nc]C['A', 'B' or 'C'.]LB[oe:C][md:B][od:A]
(;B[od];W[pd]C['A' or 'B' don't work.]LB[pc:B][pe:A]
(;B[pe];W[pc];B[md];W[ld]C['A' or 'B' don't work.]LB[le:B][lc:A]
(;B[lc];W[le];B[kc];W[oe];B[ne];W[of];B[nf];W[og]
C['A' or 'B' don't work.]LB[ng:B][qe:A]
(;B[qe];W[mg])

(;B[ng];W[qe];B[pf];W[pg];B[qf];W[re];B[qg];W[qh];B[ph];W[oh];B[rh];
W[qi];B[rg];W[ri])
)

(;B[le];W[lc];B[me];W[qe];B[qf];W[re];B[pf];W[rd])
)

(;B[pc];W[pe]C['A' or 'B' don't work.]LB[md:B][qc:A]
(;B[qc];W[me])

(;B[md];W[qc];B[pb];W[qb])
)
)

(;B[md];W[ld]C['A' or 'B' don't work.]LB[lc:B][le:A]
(;B[le];W[lc];B[od];W[pd])

(;B[lc];W[le];B[od];W[pd]C['A' or 'B' don't work.]LB[pe:B][pc:A]
(;B[pc];W[pe];B[qc];W[kc];B[nf];W[ne])

(;B[pe];W[pc];B[oe];W[kc];B[lb];W[kb])
)
)

(;B[oe]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.]
;W[ld];B[le];W[kc];B[ke];W[pd];B[pe];W[qc];B[re];W[md];B[me]
C[Tenuki, 'A' or 'B'.]LB[rc:B][ic:A]
(;W[ic];B[pl])

(;W[rc])
)
)

(;W[od];B[oe];W[ne]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pe:b][md:a]
(;B[md];W[pe];B[of];W[pd];B[pf];W[qe];B[lc])

(;B[pe];W[me])
)

(;W[md]C[White 6 is a mistake in direction.];B[me];W[le];B[ne];W[ld];
B[kc])
)
)
)

(;B[od]
C[
Tsuke
------

Black 3 may be used when Black is strong on the right side.
]
;W[nd];B[oe]
C[
Tsuke-Nobi (attach-extend)
------------------------------

Black 3 and 5 are the tsukenobi.
]
;W[pc];B[qc]C[White continues with 'a' or 'b'.]LB[ne:b][kc:a]
(;W[kc];B[qj])

(;W[ne];B[nf]C[White continues with 'a' or 'b'.]LB[of:b][lc:a]
(;W[lc];B[qf])

(;W[of];B[qf];W[og];B[mf];W[lc]
C[Black 'a' and White 'b' are the respective tesujis for each side
to settle himself.]
LB[qg:b][ld:a])
)
)

(;B[nd]
C[
Kata-tsuki (shoulder hit)
--------------------------

Since the Ming era the Joseki is named "dao chui lian", which translates to "drooping lotus".
Black 3, a straight-forward attempt to build thickness, is generally
regarded as a trick play, but White must be careful in answering.

Black must have the ladder to play this way.

White continues with 'a'. White 'b' and 'c' are not recommended.
]
LB[pd:c][qc:b][od:a]
(;W[od];B[oe]
C[White 'a' is correct. White 'b' is a mistake, though Black may
make his own mistakes after White 'b'.]
LB[pe:b][ne:a]
(;W[ne]
C[White 6 is the only move.

Black may try 'a' or 'b'. Black 'c' is a mistake.]
LB[md:c][pe:b][nc:a]
(;B[nc]C[White continues with 'a' and 'b'.]LB[nb:b][pe:a]
(;W[pe];B[of];W[pd];B[pf];W[qe];B[qf];W[re];B[me])

(;W[nb];B[me];W[nf];B[of]
C[White continues with 'a'. White 'b' is a mistake.]LB[ng:b][mf:a]
(;W[mf];B[mb];W[pb];B[na];W[ob];B[mc];W[le]
C[Black continues with 'a'. Black 'b' takes the five White stones
and the corner, in the process giving White magnificant thickness.
Black 'c' is also unreasonable.]
LB[qb:c][qc:b][jc:a]
(;B[jc];W[qc])

(;B[qc]C[Black 19 is a mistake.];W[kc];B[kb];W[jb]
C[Black continues with 'a'. Black 'b' is a trick play difficult
to counter.]
LB[jc:b][lb:a]
(;B[lb];W[ic];B[qb];W[og];B[qf];W[lc];B[pd];W[md];B[pa])

(;B[jc]
C[White continues with 'a'. White 'b' is a ridiculous mistake.
White 'c' is also a mistake, worse than 'b', though seemingly
much less ridiculous.]
LB[lc:c][kd:b][og:a]
(;W[og]
C[Black continues with 'a' to capture the White stones in the corner. 
Black 'b' fails to unbreak the ladder and is a mistake.]
LB[pg:b][pd:a]
(;B[pd];W[lc];B[lb];W[ib]C['a' is correct, the ladder 'b' is broken.]
(;B[qb];W[pg];B[qf];W[md];B[pa];W[id]
C[Black 23 retains some aji, but White has triumphed.])

(;B[ld];W[kd];B[ke];W[md];B[jd];W[ld];B[lf];W[me];B[mg];W[ng])
)

(;B[pg]C[Black 25 is a mistake, it threatens to unbreak the ladder.];
W[pf]C[But White keeps the ladder broken in sente.];B[pe];W[lc]
C[So now White is one move ahead in the capturing race.];B[lb];W[ib]
C['a' or 'b' fail.]
(;B[qb];W[md]C['a' or 'b' fail.]
(;B[pa];W[ka];B[ma];W[ja];B[oa];W[la];B[pd];W[qa])

(;B[ja];W[la])
)

(;B[ld];W[kd];B[ke];W[md];B[jd];W[ld];B[lf];W[me];B[mg];W[ng];B[nh];
W[oh];B[oi];W[ph])
)
)

(;W[kd]C[White 24 is a mistake.];B[ib];W[lb];B[ja];W[lc];B[la];W[md];
B[ma])

(;W[lc]
C[White 24 is a mistake. White must play 'a' before 24, as it breaks
a ladder. This sequence shows why.]
LB[og:a];B[lb];W[ib];B[ld];W[kd];B[ke];W[md];B[jd];W[ld];B[lf];W[me];
B[mg]
C[White is captured in a ladder. If White had played 'a' first,
the ladder would be broken.]
LB[og:a])
)
)

(;B[qb]
C[White 19 is a mistake. 

White continues with 'a'. White 'b', giving up the stones, is
a mistake.]
LB[kc:b][qc:a];W[qc];B[rc];W[rb]
C[White must not play 'a' first, as then Black takes the first
ko, not White.]
LB[pd:a];B[pc];W[pd];B[qe];W[qc];B[qa];W[ra];B[pc];W[pe];B[pf];W[qc]
C[Black has no more ko threats.])
)

(;W[ng]C[White 12 is a mistake, too slack for the fight.];B[pd];W[pb];
B[lc];W[rc];B[rd];W[mb];B[ke];W[rb];B[og];W[nh];B[pi]
C[Black makes territory and White is left in an awkward position.])
)
)

(;B[pe];W[md];B[nf];W[me]
C[Stand on your head and see White - the drooping lotus.
])

(;B[md];W[pe];B[of];W[pd];B[mf];W[qe])
)

(;W[pe]C[White 6 is bad.];B[pd];W[ne];B[of];W[md];B[nf]
C[White 'a' looks logical, but 'b' is better.]LB[nc:b][me:a]
(;W[me];B[ob]
C[Black 13 is the tesuji that makes Black 3 worth trying in the
first place.

White 'a' and 'b' both lead to losses (or should anyway).]
LB[pc:b][nc:a]
(;W[nc]C[White 14 is honte (the right move).];B[pb])

(;W[pc];B[nc]
C[White 'a' looks promising, but 'b' is better. White 'c' is another
opportunity for Black mistakes.]
LB[qc:c][pb:b][nb:a]
(;W[nb];B[mc];W[pb];B[lc];W[qe];B[rd];W[re];B[qb];W[oa];B[rb]
C['a' and 'b' are miai, and White is trapped.]LB[qg:b][ma:a])

(;W[pb];B[nb]
C[White 'a' is a mistake. White 'b' is better, though the outcome
favors Black.]
LB[rc:b][qc:a]
(;W[qc]
C[White 18 is a mistake.

Black continues with 'a'. Black 'b' is a mistake.]
LB[rd:b][rc:a]
(;B[rc];W[rd];B[qe];W[rb];B[lc];W[pf];B[re];W[pg];B[sd];W[mg];B[pa];
W[qb];B[sb]C[Black wins.])

(;B[rd]C[Black 19 is a mistake.];W[mc];B[rc];W[pa];B[qa];W[rb]
C[White wins.])
)

(;W[rc]C[White 18 is the correct move.];B[rd];W[qc];B[lc];W[pf];B[pg];
W[re];B[qg];W[rf];B[nh])
)

(;W[qc]
C[Black continues with the unlikely move 'a'.

The extension of Black 'b' looks correct, but is a mistake.]
LB[rd:b][rc:a]
(;B[rc]C[Black 17 is better than it looks.];W[rd];B[qe];W[rb];B[qb];
W[sc];B[pb];W[rc];B[re];W[nb];B[mc];W[mb];B[lc];W[lb];B[kc];W[qa];
B[lf])

(;B[rd]C[Though not obviously so, Black 17 is a mistake.];W[mc];B[nb];
W[pb];B[rc];W[pa];B[qb];W[rb];B[ra];W[mb])
)
)
)

(;W[nc]C[White 12 is the correct move.];B[le];W[kd];B[qg])
)
)

(;W[qc]C[White 4 lacks fighting spirit.];B[od]
C[White continues with 'a' or 'b'.]LB[pd:b][rd:a]
(;W[rd];B[pc];W[pb];B[pd];W[rb];B[re];W[nc];B[md])

(;W[pd];B[pe];W[pc];B[re])
)

(;W[pd]C[White 4 helps Black build thickness.];B[pe];W[qc];B[re];W[nc]
;B[md])

(;W[nc]C[White 4 is passive.];B[md];W[mc];B[ld];W[kc];B[pe])
)

(;B[pc]AB[kc]
C[Black 3 makes sense in the context of having Black support at
top as shown or nearby.

Kitani Minoru was fond of Black 3.
'A' is usual, 'B' is possible.]
LB[nd:B][od:A]
(;W[od]
C[Black continues with 'A'. To avoid cutting possibilities, 'B'
is ok.]
LB[pe:B][pf:A]
(;B[pf]
C[Black 5 is thinner than the kosumi, leaving Black more subject
to later cutting.]
;W[le])

(;B[pe];W[le]
C[Depending upon the exact location of the top side Black stone,
other White continuations are possible.])
)

(;W[nd]C['A' is usual, 'B' depends on the ladder.]LB[oe:B][pf:A]
(;B[pf])

(;B[oe];W[pb];B[qb];W[pd];B[qc];W[pe];B[od];W[of])
)
)

(;B[oe]
C[
Takageima = Nop'danarincha = Gao Fei = High Knight's Move
----------------------------------------------------------

Black 3 is a trick play. White continues with 'a'. White 'b'
is not good.
]
LB[md:b][qc:a]
(;W[qc]C[Black continues with 'a'. Black 'b' is unreasonable.]
LB[rc:b][pd:a]
(;B[pd];W[pc];B[me];W[lc])

(;B[rc]C[Black 5 is an overplay.];W[pd];B[pe];W[rd];B[qe];W[rb])
)

(;W[md]C[White 4 is not recommended.];B[pc];W[od];B[pd])
)

(;B[tt]
C[
Tenuki
-------

Black need not answer immediately. The continuation is shown as Mokuhazushi-Komoku.
])
)

(;W[nc]
C[
Nikken Kakari = Dukan Keolch'im = E`r Gua`jiao~ = 2-Space Low Approach
-----------------------------------------------------------------------

White 2 is used with friendly forces backing it up. Its purpose
is to prevent a pincer. Locally it results in a loss, but may
be appropriate fuseki strategy. 

It was popular in the late 1950s and early 1960s, but is not
seen often nowadays, having been replaced by the one-space high
approach, with which it has points in common.

Black responses range from 'a *', 'b *', 'c' or 'd *'. Black
may also play elsewhere 'e'.
'f' is smilar to 'd'

'g', 'h' and 'i' are inferior.

elsewhere e5, d4, c3, b2, a1
]
LB[jc:i][jd:h][ld:g][kc:f][dp:e][kd:d][lc:c][od:b][pc:a]
(;B[pc]
C[
Kosumi = Ibkucha = Jian = Diagonal
-----------------------------------

White continues with 'a *'. The wisdom of White 'b' depends on
the left corner.
]
LB[jd:b][kc:a]
(;W[kc]AB[dc][de]
C[
* GOOD VARIATION *

Here is an example where White may try this approach. 

Black continues with 'a'. Black 'b' lacks direction.]
LB[qg:b][ic:a]
(;B[ic]
C[White has erased some of Black's left-side enclosure influence,
but Black 5 is a good follow-up to White 4.

White may continue with 'a' to build a center position, or 'b'
to emphasize the right side. 'c' appears in the Kobayashi Fuseki.
]
LB[qf:b][pe:a][ne:c]
(;W[pe]C[kake (press-down)];B[qe];W[pg];B[qf];W[ng];B[qh])

(;W[qf];B[oe];W[qi])

(;W[ne];B[md]LB[nd:A][mc:B]C['A' or 'B'.
]
(;W[nd];B[pf];W[ke])

(;W[mc];B[nd];W[od];B[oc];W[le];B[ld];W[kd];B[oe];W[me];B[pd];W[lc];
B[od];W[jf])
)
)

(;B[qg]C[Black 5 is a mistake.];W[hc]
C[Now White has excellent position.])
)

(;W[jd]AB[dc][de]C[In this case, White 4 is a mistake.];B[hc]
C[Now White must defend at 'A' or 'B'. 'C' shows what happens if
White plays elsewhere.]
LB[dp:C][jb:B][ne:A]
(;W[ne];B[qg];W[jb])

(;W[jb]C[White 6 is necessary])

(;W[tt]C[White plays elsewhere, a mistake.];B[ld];W[lc];B[kc];W[kd];
B[jc]C[White is split by the invasion.])
)
)

(;B[od]
C[
Kata-tsuki (shoulder-hit)
--------------------------

White can respond with 'a *' or 'b'.
]
LB[pb:b][nd:a]
(;W[nd]
C[Black continues with 'a *' or 'b *'. Black 'c' is not recommended.]
LB[oe:c][ne:b][oc:a]
(;B[oc];W[ne]
C[
* GOOD VARIATION *

Black continues around 'a' or 'b' to erase White thickness.]
LB[id:b][jd:a];B[jd];W[oe];B[qf];W[oh];B[pg];W[og];B[pj])

(;B[ne]
C[White continues with 'a *'. White 'b' is not recommended, as
it only strengthens Black. White 'c', also not recommended, presents
a contradiction.]
LB[pb:c][oc:b][me:a]
(;W[me];B[oc];W[ob];B[pb];W[nb];B[oe];W[mf]
C[
* GOOD VARIATION *

The corner is safe, as one can see from the continuation.]
;B[tt]
C[Black plays elsewhere. As a continuation, White tries an invasion.];
W[qb]C[White invades.];B[pa];W[qc];B[pc];W[rd];B[re];W[qe];B[qf];W[pd]
;B[pe]C[White cannot live.])

(;W[oc]C[White 6 is not recommended.];B[pc];W[oe];B[pd]
C[White continues with 'a'. White 'b' is an overplay.]LB[of:b][me:a]
(;W[me];B[nf];W[ld]
C[Black can continue at 'a', 'b', or play elsewhere.]LB[mg:b][of:a])

(;W[of]C[White 10 is risky.];B[me];W[kc];B[qg];W[ng];B[lf]
C[Black is secure, while White is vulnerable to attacks at 'a'
at 'b'.]
LB[lc:b][ic:a])
)

(;W[pb]
C[White's orientation toward influence with 4 contrasts with the
territory orientation of 6.]
;B[me];W[qc];B[rd];W[lc])
)

(;B[oe]C[Black 5 is slack.];W[pb];B[ne];W[me];B[mf];W[le])
)

(;W[pb]
C[Black continues with 'A' if an extension on the right side is
far from the two Black stones or 'B' if it's near. 'C' is pushing
from behind and amateur style.
'D' is a trick play.
]
LB[nd:C][lc:B][ld:A][ob:D]
(;B[ld]C[Black 5 is a powerful play.];W[nd]
C['A' is modern. 'B' leads to a big lump.]LB[ne:B][oc:A]
(;B[oc];W[ob]C['A' and 'B' are both possible.]LB[mb:B][qc:A]
(;B[qc]C['A' is ok. 'B' is questionable.]LB[nf:B][mb:A]
(;W[mb];B[ne];W[kc])

(;W[nf];B[mb];W[nb];B[pg];W[lg];B[lf];W[mf];B[kf];W[kg];B[jf];W[jg];
B[hf];W[ig];B[ge])
)

(;B[mb]C['A' is correct, 'B' is disadvantageous.]LB[oe:B][qc:A]
(;W[qc];B[nb]C['A' takes sente, 'B' more territory.]LB[qe:B][rd:A]
(;W[rd];B[ne])

(;W[qe];B[ne];W[pd];B[oe];W[qg])
)

(;W[oe];B[qc];W[nb];B[ne];W[lc];B[me];W[kc];B[of])
)
)

(;B[ne]
C[White continues with 'a'. White 'b' is usually good style, but
not here.]
LB[oe:b][me:a]
(;W[me];B[md];W[oe];B[nf];W[pd];B[pe];W[oc];B[of];W[qe];B[od];W[rd];
B[pc];W[qc];B[pd];W[pf];B[oe];W[rb];B[qf];W[re];B[pg])

(;W[oe]C[White 8 is a mistake.

Black continues with 'a' or 'b'.]
LB[of:b][me:a]
(;B[me]
C[White 'a' and 'b' are not recommended. White lacks a good continuation.]
LB[of:b][pd:a]
(;W[pd];B[pe];W[oc];B[of]
C[The ko is too big for White to cut at 'a', so White is at a loss.]
LB[qe:a])

(;W[of];B[pd])
)

(;B[of];W[pe];B[pd])
)
)
)

(;B[lc]LB[nd:A][qc:B]
C[White must choose between two evils:
'A' goes out, but lacks a safe base.
'B' takes territory, but gets bad shape or is totally enclosed by Black.
]
(;W[nd]
C['A' is the modern joseki using the pincer Black 5 to atack White,
'B' an older one giving away Black 5.
'C' is inferior.
]
LB[qc:A][oc:B][ne:C][lc:5]
(;B[qc];W[ld]
C[The given continuation is only one of many possibilities.
];B[kd]
C['A' is joseki. 'B' or 'C' are maybe inferior.
]LB[le:A][kc:B][ke:C]
(;W[le];B[jc];W[of])

(;W[kc];B[jc];W[kb];B[jd];W[lb];B[le];W[md])

(;W[ke];B[jd];W[lf])
)

(;B[oc];W[ob];B[qc]C['A' is recommended, 'B' is possible.
]
LB[nf:B][mb:A]
(;W[mb];B[ne];W[ld];B[me];W[kd];B[qj];W[hd]
C[White wants to make a kakari against the top left corner in sente
before this move.])

(;W[nf];B[mb];W[nb];B[pg];W[ld]
C['A' is usual.
'B' is good if Black has a position in the top left corner, Black
needs the ladder.]
LB[kd:B][jc:A]
(;B[jc];W[je];B[hd])

(;B[kd];W[kc];B[le];W[md];B[jc];W[kb];B[jb];W[jd];B[ke];W[lb];B[id])
)
)

(;B[ne];W[me];B[md];W[oe];B[nf];W[pd];B[pe];W[oc];B[of];W[qe];B[od];
W[rd];B[pc];W[qc];B[pd];W[pf];B[oe];W[rb];B[qf];W[re];B[pg];W[le])
)

(;W[qc]LB[pd:A][rd:B][nd:C][pc:D]
C['A' and 'B' let White go out in bad shape.
'C' encloses White totally, but discards territory on the right side.
'D' encloses White totally, White chooses the direction of Black's wall.
]
(;B[pd];W[nd];B[ne]LB[md:A][me:B][ld:C]
C['A' is the only move, 'B' and 'C' don't work.
]
(;W[md])

(;W[me];B[md])

(;W[ld];B[ob];W[oc];B[pc];W[qb];B[md];W[mc];B[mb];W[me];B[nb];W[md];
B[kc];W[rd];B[re];W[sc];B[ra];W[rb];B[se])
)

(;B[rd];W[nd];B[ne]LB[md:A][me:B][ld:C]
C['A' is ok.
'B' is not recommended.
'C' is bad.
]
(;W[md])

(;W[me];B[md];W[oe];B[nf];W[pd];B[pe];W[oc];B[of];W[le];B[jc];W[qe]
C[Later, White can get two stones in gote - a small endgame.
];B[od];
W[kd];B[kc];W[oe];B[pf];W[re];B[rf];W[rc];B[qf];W[sd])

(;W[ld];B[oc]LB[ob:A][nb:B]
C['A' or 'B' don't give White a good result.
]
(;W[ob];B[md];W[mc];B[me]LB[lb:A][kc:B]
C['A' -> White is pressed down.
'B' -> White lives in the corner, but puts heavy stones without much use on the board.
]
(;W[lb];B[kc];W[kb];B[jc])

(;W[kc];B[lb];W[mb];B[ma];W[nb];B[kb];W[jc]LB[jb:A][kd:B]
C[Black keeps attacking on 'A' or kills with the ladder on 'B'.
]
(;B[jb];W[ic];B[ib];W[hc];B[hb]LB[rc:A][gc:B]
C[White lives after 'A' leaving his central stones heavy or dies after 'B'.
]
(;W[rc];B[gc])

(;W[gc];B[le];W[kd];B[rb];W[gb];B[qb];W[ha];B[pc];W[ia];B[pa];W[ja];
B[oa])
)

(;B[kd];W[le];B[jd];W[jb];B[lf])
)
)

(;W[nb]LB[md:A][ob:B]C['A' is correct, 'B' is bad.
]
(;B[md];W[mc];B[me];W[kc];B[lb];W[kb];B[ob];W[oa];B[ma];W[na];B[kd];
W[le];B[lf];W[ke];B[jd];W[pa]LB[jf:A][kf:B]
C['A' walls in White, 'B' starts a ladder killing all White stones.
]
(;B[jf])

(;B[kf])
)

(;B[ob];W[oa];B[md];W[oe];B[me];W[pd];B[pe];W[of])
)
)
)

(;B[nd];W[rd];B[qe];W[re]LB[qf:A][qg:B]C['A' or 'B' are ok,
]
(;B[qf])

(;B[qg])
)

(;B[pc]LB[qb:A][oc:B]
C['A' lets Black build a wall to the top, 'B' to the right side.
]
(;W[qb];B[nd];W[rd];B[qe];W[re];B[qf]PL[1];B[oc]C[Later
])

(;W[oc];B[pd];W[rb];B[rc];W[qb];B[nd];W[rd];B[re];W[sc])
)
)
)

(;B[nd];W[mc]
C[Variation continues with Black 'a'. Black 'b' has been seen in
professional games (Cho Chikun played it against Kato Masao in
the 1st game of the 1983 Judan title).]
LB[ld:b][md:a]
(;B[md]C['A' or 'B'.]LB[lc:B][qc:A]
(;W[qc]C[Black continues with 'a' or 'b'.]LB[rc:b][rd:a]
(;B[rd];W[lc];B[qj])

(;B[rc]C[White continues with 'a'. White 'b' is a mistake.]
LB[rb:b][lc:a]
(;W[lc])

(;W[rb]C[White 10 is a mistake.];B[pc];W[qb];B[lc])
)
)

(;W[lc];B[ke];W[ic])
)

(;B[ld]
C[Black 7 is a stretch. Black is willing to follow up with 'a'
or 'b'.]
LB[lc:b][md:a];W[qc];B[rd];W[kb];B[md])
)

(;B[ob];W[oc];B[pc];W[nd];B[nb])
)
)

(;B[lc]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

'A' or 'B' are ok. 'C' is a new development.
]
LB[pd:B][qc:A][ne:C]
(;W[qc]
C['A' is the deep-deep-joseki and takes the top side, with 'B'
Black keeps the right side.
'C' is joseki with a stone on the triangled position.]
LB[pd:C][rc:B][pc:A]TR[pj]
(;B[pc];W[pd]
C[Black continues with 'a'. In the deep-deep-joseki, White plays
a deep approach with 2, and of the two ataris 'a' and 'b', White
plays the deep atari 'a' at first.
Black 'b' is a mistake.
Black 'c', basically a sacrifice play, is possible.]
LB[pb:c][od:b][qb:a]
(;B[qb];W[rc];B[od];W[pe];B[oc];W[rb]
C[Black continues with 'a' or 'b'.]LB[pg:b][of:a]
(;B[of];W[oe];B[ne]
C[White continues with 'a'. White 'b' is a vulgar mistake.]
LB[pf:b][qe:a]
(;W[qe]C[Black continues with 'A', 'B' or 'C'.]LB[qf:C][nf:B][nd:A]
(;B[nd];W[nf]C[Later, White can continue here.];B[og];W[mf];B[qf];
W[re];B[nh])

(;B[nf];W[qg]
C[White 18 is big, as it prevents Black 'a', which White must answer
with 'b'. White looks to playing 'c', after which 'd' and 'e'
become tempting.]
LB[nb:e][nd:d][jc:c][re:b][qf:a])

(;B[qf]C['A' is correct, cutting like 'B' is not recommended.]
LB[nf:B][re:A]
(;W[re];B[nf])

(;W[nf];B[re];W[rd];B[pf];W[qd];B[me])
)
)

(;W[pf]C[White 6 is a mistake.];B[pg]
C[White must play 'a'. Black 'b' is a mistake.]LB[nf:b][re:a]
(;W[re];B[nf])

(;W[nf]C[White 18 is a mistake.];B[qf];W[og];B[qe];W[of];B[ph];W[nd];
B[nb]
C[White 'a' and the White corner stones die. White 'b' (a live
corner) and Black gets 'a'.]
LB[pb:b][me:a]
(;W[me];B[ob])

(;W[pb];B[ob];W[qa];B[me])
)
)
)

(;B[pg]C[White continues with 'a' or 'b'.]LB[of:b][oe:a]
(;W[oe];B[nd];W[ne];B[me];W[mf];B[le];W[ng])

(;W[of];B[og];W[nf];B[nd];W[qf];B[qg];W[rf])
)
)

(;B[od]C[Black 7 is a mistake in order.];W[pe];B[qb];W[oc];B[rc];W[pb]
;B[qc];W[ne]C[Black's pincer has lost its meaning.])

(;B[pb]C[White continues with 'a'. White 'b' is not as good.]
LB[pe:b][qb:a]
(;W[qb];B[pe];W[od];B[rd];W[ob];B[rb];W[oc];B[rc];W[pa];B[qh]
C[White 2 is not good shape, but capturing the two Black stones
makes this a reasonable result.])

(;W[pe]C[White 8 gives Black the corner for White thickness.];B[rc];
W[qe];B[rd];W[ne])
)
)

(;B[rc];W[pc];B[re]C['A' or 'B'.]LB[oe:B][ne:A]
(;W[ne])

(;W[oe];B[pf];W[of];B[pg];W[le];B[ic])
)

(;AB[pj];B[pd];W[pc];B[od];W[nb];B[me])
)

(;W[pd];B[pe];W[qc];B[rc];W[pc];B[re];W[oe];B[pf];W[rb];B[sb];W[of];
B[pg])

(;W[ne]C[new joseki development
])
)

(;B[kd]
C[
Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia = 2-Space High Pincer
-----------------------------------------------------------------------------

The two-space high and one-space high pincer are similar.

White continues with 'a *' or 'b'. White 'c' is not recommended.
]
LB[ne:c][pd:b][qc:a]
(;W[qc];B[pc];W[pd];B[qb];W[rc];B[od];W[pe];B[oc]
C[White continues with 'a *'. White 'b' gives White sente at a
cost of local loss.]
LB[qf:b][rb:a]
(;W[rb]C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[nd:b][pg:a]
(;B[pg];W[of];B[nd];W[og]C[Black continues with 'a *' or 'b'.]
LB[rg:b][pi:a]
(;B[pi];W[qg]C[
* GOOD VARIATION *])

(;B[rg];W[re];B[qj])
)

(;B[nd]C[Black 13 is too mild.];W[pg])
)

(;W[qf]C[White 12 is not recommended unless sente is essential.];B[rb]
;W[rd];B[nd])
)

(;W[pd]
C[White 4 is a powerful play.

Black continues with 'a' to 'd'.]
LB[pe:d][pc:c][qe:b][qc:a]
(;B[qc]C[White continues with 'a'. White 'b' makes White 4 pointless.]
LB[pf:b][qe:a]
(;W[qe];B[pe];W[re]
C[Black continues with 'a'. Black 'b' is not recommended, especially
if White has a favorable ladder to the far corner.]
LB[od:b][pc:a]
(;B[pc];W[od];B[pf];W[qg]
C[The future is uncertain, but fighting is certain.

Black's pincer at 3 is not in great position, and the three Black
corner stones are not quite alive, so White has little to fear.])

(;B[od]C[Black 9 is not recommended.];W[pc];B[oc];W[pb];B[ob];W[qb];
B[pf]
C[Black must defend with 15 against the cut at 'a'. If the ladder
is favorable, White can cut at 'a' anyway.]
LB[oe:a])
)

(;W[pf]C[White 6 is a mistake.];B[qe];W[nf];B[qg])
)

(;B[qe];W[qc];B[rc]
C[White continues with 'a', or if White has a favorable ladder,
the tough double hane of 'b'. White 'c' is also possible.]
LB[pe:c][rb:b][pc:a]
(;W[pc];B[rb]
C[White typically continues with 'a', but may choose 'b' with a
later aim.]
LB[kb:b][of:a]
(;W[of]C[A possible continuation.];B[pg])

(;W[kb]
C[White plays 10 to provide a base for his stones so as to play
'a' later.]
LB[qg:a])
)

(;W[rb]
C[White must have the ladder to play this way.

Black continues with 'a'. Black 'b' shows the ladder setup, playable
only if Black has the ladder to the opposite corner (in which
case White 8 is a mistake).]
LB[pc:b][qb:a]
(;B[qb];W[pc];B[sb];W[pf];B[qf];W[qg];B[rg];W[pe])

(;B[pc];W[qb];B[od])
)

(;W[pe];B[qf];W[rb];B[qb];W[pc];B[sb];W[og];B[ph];W[hd])
)

(;B[pc];W[qe];B[od];W[pe];B[oc];W[qc]
C[Black continues with 'a'. Black 'b' favors White.]LB[oe:b][qb:a]
(;B[qb];W[rd];B[nd]
C[As 'a' and 'b' are miai, White may continue elsewhere.]
LB[qi:b][rb:a])

(;B[oe]
C[White continues with 'a'. White 'b' creates aji for Black. White
'c' is not recommended.]
LB[of:c][qb:b][rd:a]
(;W[rd];B[og]C[Black must play 13 or White plays 'a'.]LB[of:a])

(;W[qb]C[White 12 creates aji for Black.])

(;W[of]C[White 12 is not recommended.];B[pf]
C[A fight ensues with good odds towards Black.])
)
)

(;B[pe];W[qc]C[Black continues with 'a'. Black 'b' is less favorable.]
LB[qe:b][rc:a]
(;B[rc];W[pc];B[re];W[oe];B[pf];W[of];B[pg])

(;B[qe]C[Black 7 is not recommended.];W[pc]
C[White is satisfied to have some corner profit and be sufficiently
settled. 

A Black extension to 'a' in gote is not recommended unless it
works toward the bottom right corner.]
LB[qi:a])
)
)

(;W[ne]C[White 4 is not recommended.];B[pf]
C[After Black 5, the exchange of White 'a', Black 'b' doesn't work
well.]
LB[pc:b][qc:a])
)

(;B[tt]
C[
Tenuki
-------

Black plays elsewhere.
This position is covered as the variation Black on 2, White on 1.
]
LB[qd:1][nc:2])

(;B[kc]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

If you are high-dan and know a different follow-up than the given
one. mail it to me please: kogo@waterfire.us.
]
;W[qc];B[pc];W[pd];B[qb];W[rc];B[od];W[pe];B[oc];W[rb]C['A' or 'B'.]
LB[of:B][pg:A]
(;B[pg]C['A' or 'B'.]LB[oe:B][of:A]
(;W[of];B[nd];W[og]C['A' or 'B'.]LB[rg:B][pi:A]
(;B[pi];W[qg])

(;B[rg];W[re];B[qj])
)

(;W[oe];B[nd];W[ne];B[me];W[mf];B[le];W[ng])
)

(;B[of];W[oe];B[ne];W[qe];B[nd];W[qg])
)

(;B[ld]
C[
Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia = 1-Space High Pincer
-------------------------------------------------------------------
Not recommended.
]
;W[qc];B[pc];W[pd];B[qb];W[rc];B[od];W[pe];B[oc];W[rb];B[pg];W[of];
B[nd]C[The traingled stone is now not in the best position.]TR[ld])

(;B[jd]
C[
Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia = 3-Space High Pincer
-----------------------------------------------------------------------------

Not recommended.
]
;W[qc];B[pc];W[pd];B[qb];W[rc];B[od];W[pe];B[oc];W[rb];B[pg];W[of];
B[nd];W[og];B[pi];W[qg]
C[Because of the too wide position of the triangled position, White
has now an invasion point on A.]
PL[2]LB[lc:A]TR[jd])

(;B[jc]
C[
Sangen Basami = Sekan Hyeopgong = San Jia = 3-Space Low Pincer
---------------------------------------------------------------

Not recommended.
]
;W[qc];B[pc];W[pd];B[qb];W[rc];B[od];W[pe];B[oc];W[rb];B[pg];W[of];
B[nd];W[og];B[pi];W[qg]
C[Because of the bad position of the triangled stone, there is
an invasion point on A.]
LB[lc:A]TR[jc])
)

(;W[nd]
C[
Nikken Takagakari = Dukan Nop'dakeolch'im = E`r Gaojia = 2-Space High Approch
------------------------------------------------------------------------------

The great master Honinbo Shuei (1852-1906) favored the two-space
high (niken taka-gakari) approach, especially in two stone handicap
games. This approach move was very popular in the 1910s. Wu Qingyuan = Go Seigen
frequently played this way, considering it a good "whole board"
approach. In recent years, O Rissei has often used the two-space
high approach.

Almost all variations have been completely explored. 

Black plays 'a *', 'b *', 'c *', 'd', 'e *', elsewhere ('f')
or 'k'.
'd' secures the corner, but is submissive. 'g' attaches to a
weak stone, forcing it to strengthen. 'h' is an overplay. 'j'
is not recommended.

h8, g7, f6, e5, d4, c3, b2, a1
]
LB[kd:k][kc:j][ld:i][nc:h][od:g][dp:f][lc:e][pc:d][ne:c][oc:b][pf:a]
(;B[pf]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

Black 3 is peaceful. Black 3 was common when this approach move
was first played, but no longer.

White continues with 'a *'. White 'b' is one space too far.

White 'c' erases aji in the corner for White.

If there is already a Black stone on the triangled position like
in the Chinese Fuseki, White 1 was maybe doubtful. 'd' shows
punishment variation to be compared with the 'a' variations.
]
LB[qc:d][pc:c][ic:b][jc:a][nd:1]TR[kc]
(;W[jc]
C[Black continues with 'a *', plays elsewhere ('b'), or aggressively
invades with 'c'.]
LB[lc:c][dp:b][qj:a]
(;B[qj]
C[
* GOOD VARIATION *

The corner is now important. White continues with 'a'. White
'b' is insufficient.]
LB[pc:b][qc:a]
(;W[qc]
C[If White goes into the corner, White 6 is the only move. 

Black continues with 'a'. Black 'b' is submissive.]
LB[rc:b][pc:a]
(;B[pc];W[pd]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[qb:b][od:a]
(;B[od];W[pe]
C['A' is usual.
If Black has the ladder, taking the corner with 'B' is possible.]
LB[qe:B][oe:A]
(;B[oe];W[qe];B[qf]
C[White continues with 'a'. White 'b' is a mistake.]LB[rd:b][re:a]
(;W[re]C[Black continues with 'a' or 'b'.]LB[qb:b][rf:a]
(;B[rf];W[rd];B[pb]C[White continues with 'a' or 'b'.]LB[nb:b][qb:a]
(;W[qb];B[nc];W[of];B[ne];W[og];B[ph])

(;W[nb]
C[White 18 is a tesuji providing protection on the top side. White
can still live in the corner, as Black must connect at 'a'.]
LB[oc:a];B[rb];W[qb];B[qa];W[rc];B[oc];W[ra];B[sa];W[sc]
C[Next, Black should play 'a' to protect the cutting point.]LB[ng:a])
)

(;B[qb];W[rd];B[oc];W[rb];B[ng])
)

(;W[rd]C[White 14 is a mistake.];B[re];W[qd];B[oc]
C[White continues with 'a'. White 'b' is not recommended.]
LB[of:b][rf:a]
(;W[rf];B[rg];W[se];B[of])

(;W[of]C[The cut is premature.];B[rf];W[rb];B[ne]
C[White's cutting stone will be a burden. Besides, Black has the
forcing move at 'a', requiring White 'b'.]
LB[sc:b][pb:a])
)
)

(;B[qe];W[oe];B[oc];W[rc];B[qf];W[nc];B[nb];W[mb];B[ne];W[of]
C['A' -> ladder, 'B' -> sente ko for White.]LB[ob:B][mc:A]
(;B[mc];W[md];B[og];W[nf];B[me];W[ld];B[mf])

(;B[ob];W[mc];B[qb];W[rb];B[ra];W[pa];B[qa];W[na];B[pb];W[ma];B[oa];
W[sa];B[sb];W[sc];B[rd];W[sa])
)
)

(;B[qb]C[White continues with 'a'. White 'b' is not as favorable.]
LB[rc:b][qe:a]
(;W[qe];B[rc];W[pe];B[re];W[qf])

(;W[rc]C[White 10 is not recommended.];B[od];W[pe];B[oe];W[qe];B[qf];
W[re])
)
)

(;B[rc]C[Black 7 is weak.]PL[2];W[pc];B[re])
)

(;W[pc]C[White 6 is a mistake.];B[qc];W[pd];B[pe]
C[White retains weak points at 'a', 'b', and 'c'.]LB[nc:c][md:b][lc:a])
)

(;B[tt]C[Black plays elsewhere. White continues with 'a' or 'b'.]
LB[qc:b][pj:a]
(;W[pj]
C[Black continues with 'a'. Playing elsewhere ('b') results in
a loss.]
LB[cq:b][pc:a]
(;B[pc])

(;B[tt]C[Black plays elsewhere, a local loss.];W[qc]
C[Black continues with 'a'. Black 'b' is submissive.]LB[rc:b][pc:a]
(;B[pc];W[pd]
C[Black continues with 'A'.
'B' takes a small corner giving much influence.
Black 'C' is not recommended.]
LB[pe:C][qb:B][od:A]
(;B[od];W[pe];B[oe];W[qe]C['A' is correct, 'B' is a mistake.]
LB[qf:B][oc:A]
(;B[oc];W[rd];B[og];W[qg];B[lc])

(;B[qf];W[re];B[oc];W[of])
)

(;B[qb]C['A' is correct, 'B' is a mistake.]LB[rc:B][qe:A]
(;W[qe];B[rc];W[pe];B[re];W[qf])

(;W[rc];B[od];W[pe];B[oe];W[qe];B[oc]
C['A' keeps the corner, 'B' loses it.]LB[of:B][rd:A]
(;W[rd];B[og];W[qg];B[lc])

(;W[of];B[nf];W[og];B[re])
)
)

(;B[pe];W[od];B[rc]C['A' punishes, 'B' doesn't.]LB[qb:B][qe:A]
(;W[qe];B[qb];W[rd];B[qc];W[qf];B[qg];W[rg];B[rh];W[qh];B[pg];W[rf])

(;W[qb];B[re];W[rb];B[sb];W[pb])
)
)

(;B[rc]C[Black 7 is submissive.];W[pd];B[qe];W[pc];B[rb];W[qg])
)
)

(;W[qc];B[pc];W[pd];B[od];W[pe];B[oe];W[qe];B[qf]
C[White continues with 'a'. White 'b' is not recommended.]
LB[rd:b][re:a]
(;W[re];B[oc];W[rf]
C[Black continues with 'a'. Black 'b' is the safe move, but allows
White 'a'.]
LB[of:b][qb:a]
(;B[qb];W[of];B[rc];W[og];B[ne]
C[Black later aims at 'a', White 'b', Black 'c'.]LB[rh:c][pg:b][ph:a])

(;B[of]C[Black 17 is not recommended.];W[qb])
)

(;W[rd]C[White 13 is not recommended.];B[re];W[qd];B[oc];W[of]
C[Black has a tough fight ahead.];B[rf];W[rb];B[ne]
C[White will have trouble with the cutting stone. Black 'a' is
sente, requiring White 'b'.]
LB[sc:b][pb:a])
)
)

(;B[lc]
C[White continues with 'a' or 'b'. White 'c' is not recommended.]
LB[oc:c][qc:b][ld:a]
(;W[ld]C['A' or 'B' are ok.]LB[md:B][mc:A]
(;B[mc];W[md];B[ob];W[kc];B[pc]C[Black gets a nice corner.])

(;B[md];W[mc];B[me];W[lb];B[nc];W[kc];B[mb];W[lc];B[oc])
)

(;W[qc]C[Black continues with 'a' or 'b'.]LB[pc:b][pd:a]
(;B[pd];W[mc]C[Black continues with 'a' or 'b'.]LB[ld:b][pc:a]
(;B[pc];W[ld])

(;B[ld];W[pc];B[od]
C[White continues with 'a'. White 'b' is a mistake.]LB[oc:b][nb:a]
(;W[nb]C[White 12 is a good answer to Black 11.];B[ne];W[md];B[me];
W[lb];B[ke])

(;W[oc]C[White 12 is a mistake.];B[ne]
C[Now White cannot cross underneath to White 4.])
)
)

(;B[pc];W[pd];B[od];W[oc];B[pe];W[pb];B[pd];W[nb];B[qb];W[qa];B[rc];
W[me])
)

(;W[oc]C[White 6 is weak.];B[le];W[nf];B[je];W[qc];B[rc];W[pd];B[qe];
W[qb];B[qi])
)
)

(;W[ic]C[White 4 is one space too far from White 2.];B[kc]
C[Black must immediately play 5, to prevent White from consolidating
his position.

White may try 'a' or 'b'.]
LB[jd:b][qc:a]
(;W[qc]C[White 6 makes for tough fighting.];B[pc]
C[Black has the advantage now because of Black 5.])

(;W[jd]C[White 6 doesn't work.];B[le];W[ld];B[kd];W[ke];B[md];W[me];
B[lc];W[lf];B[nc];W[ld];B[mc]
C[White is left with too many cutting points.])
)

(;W[pc]C[White 4 is not recommended.];B[qc]
C[White 4 results in Black solidifying territory in the corner.])

(;AB[kc];W[qc]C[Black punishes on 'A' or 'B'. 'C' is slack.]
LB[rc:C][pd:B][pc:A]
(;B[pc];W[pd];B[od];W[pe];B[oe];W[qe];B[qf]C[White 'A' or 'B'.]
LB[rd:B][re:A]
(;W[re];B[qb];W[rc];B[oc]C['A' or 'B'.]LB[rb:B][rf:A]
(;W[rf]
C[The triangled Black stone is too near the Black wall, but White
wasted a move with White 2, so the result is bad for White.]
LB[nd:2]TR[kc])

(;W[rb];B[ng])
)

(;W[rd];B[re];W[qd];B[oc];W[rf];B[rg];W[se]C['A' or 'B' are ok.]
LB[of:B][qh:A]
(;B[qh])

(;B[of])
)
)

(;B[pd];W[pc];B[oc];W[od];B[ob];W[rd];B[re];W[rc];B[mc];W[qe];B[pe];
W[qf];B[pg])

(;B[rc];W[pd];B[qe];W[qb])
)
)

(;B[oc]
C[
(knee-hit)
----------

White can play at 'a *', 'b *', or elsewhere ('c').

If Black has stones on the marked positions, White must jump
lightly to 'd', as 'a' and 'b' would be too heavy and 'e' would
be too close.

c3, b2, a1
]
LB[jc:e][ic:d][dp:c][od:b][nc:a]TR[pj][dd]
(;W[nc];B[od]
C[White continues with 'a *', or if faced with a impending checking
extension on the top side, 'b'.
If White is forced to play 'b', White 4 was a mistake.]
LB[nc:4][jc:b][ne:a]
(;W[ne]
C[
* GOOD VARIATION *

Black may play elsewhere ('a'), as White's position is suprisingly
weak. Of course, playing elsewhere is a loss locally. 

Continue locally with 'b'. 'c' is a punishment if White 4 was
wrong.]
LB[nc:4][jd:c][oe:b][dp:a]
(;B[tt]
C[Black plays elsewhere. 

White continues with 'a' to 'c'. White 'c' leads to difficult
fighting.]
LB[qe:c][qc:b][oe:a]
(;W[oe]
C[A possible continuation for White if Black plays elsewhere.
'A' or 'B'.]
LB[pe:B][qf:A]
(;AB[jd][pj];B[qf];W[oh]LB[og:B][pg:A]
(;B[pg];W[og])

(;B[og];W[ob];B[pb];W[qb];B[pc];W[qe];B[pe];W[pf];B[re];W[pg];B[ng];
W[of];B[kg];W[pa];B[nb];W[oa];B[qc];W[mb])
)

(;B[pe];W[pf];B[qf];W[pg];B[qg];W[ph];B[nb];W[mb];B[ob];W[qh])
)

(;W[qc]
C[A possible continuation for White if Black plays elsewhere.

Black continues with 'a'. Black 'b' and 'c' are mistakes.]
LB[rd:c][pc:b][oe:a]
(;B[oe]
C[Black gets his corner ravaged in playing 8, but this is the best
continuation.])

(;B[pc]C[Black 8 is a mistake.];W[rd];B[rc];W[qe];B[qb];W[pf])

(;B[rd]C[Black 8 is a mistake.];W[ob];B[pb];W[pc];B[nb];W[pd])
)

(;W[qe]
C[A possible continuation for White if Black plays elsewhere.

Black continues with 'a' or 'b'. Black 'c' or 'd' are not recommended.]
LB[pe:d][rd:c][pf:b][oe:a]
(;B[oe]C[Difficult fighting ensues.])

(;B[pf]C[Difficult fighting ensues.];W[rd];B[qc];W[qg])

(;B[rd]C[Black 9 is submissive.];W[oe])

(;B[pe]C[Black 8 is not recommended.];W[qf];B[pf];W[rd])
)
)

(;B[oe]C[Local continuation.];W[nf];B[pg];W[hc])

(;B[jd];W[oe];B[qf];AB[pj]
C[With this additional Black stone already on the board the given
continuations exists.]
;W[oh]C['A' or 'B' leave White heavy.]LB[og:B][pg:A]
(;B[pg];W[og])

(;B[og];W[ob];B[pb];W[qb];B[pc];W[qe];B[pe];W[pf];B[re];W[pg];B[ng];
W[of];B[kg];W[pa];B[nb];W[oa];B[qc];W[mb])
)
)

(;W[jc];B[ne]C[White continues with 'a'. White 'b' is a mistake.]
LB[me:b][ob:a]
(;W[ob];B[pb];W[nb];B[oe])

(;W[me]C[White 8 is a mistake.];B[nb];W[mb];B[ob])
)
)

(;W[od]
C[Black continues with 'a *' or 'b'. Black 'b' leads to the large
avalanche joseki. 

Black 'c' is submissive, and not recommended.]
LB[pc:c][nc:b][pd:a]
(;B[pd];W[nc];B[ob]C[
* GOOD VARIATION *])

(;B[nc]C[Black 5 leads to the large avalanche joseki.];W[pd];B[pc];
W[qe];B[md]
C[For continuation, see the variation referenced by the numbers.]
LB[md:9][nd:8][nc:7][qe:6][pc:5][pd:4][oc:3][od:2][qd:1])

(;B[pc]C[Black 5 is a weak move.];W[qe];B[re];W[pd];B[rc];W[qf];B[rf];
W[qh])
)

(;W[tt]C[White plays elsewhere. Black continues with 'a' or 'b'.]
LB[nc:b][od:a]
(;B[od]C[White continues with 'a', possibly 'b'.]LB[ne:b][nf:a]
(;W[nf];B[ne];W[me];B[oe];W[mf]C[Black may continue with 'a' or 'b'.]
LB[pg:b][lc:a])

(;W[ne];B[mb])
)

(;B[nc]C[White continues with 'a'. White 'b' is not recommended.]
LB[md:b][ld:a]
(;W[ld];B[md]C[White continues with 'a' or 'b'.]LB[mc:b][me:a]
(;W[me];B[mc];W[le])

(;W[mc];B[od])
)

(;W[md]C[White 6 is heavy.];B[lc]
C[Black 7 is a possible local continuation.])
)
)

(;AB[dd][pj]
(;W[ic]C['A', 'B' or 'C' are possible.
'D' is bad.]
LB[nc:D][lc:C][gc:B][od:A]
(;B[od];W[fc])

(;B[gc];W[nc];B[od];W[ne];B[oe];W[nf];B[pg])

(;B[lc];W[fc];B[le])

(;B[nc]C[Mistake];W[qe]C[Punishment])
)

(;W[jc]C[Too near White 2.]LB[nd:2];B[gc];W[nc];B[od];W[ne];B[pg]
C[White overconcentrated.])
)
)

(;B[ne]
C[
Uezuke (attach on top)
------------------------

Black aims for influence. Complex variations are possible.

White responds at 'a *' to 'c *', 'd'. White 'a' and 'b' require
a favorable ladder. White 'd' avoids complex variations.

d4, c3, b2, a1
]
LB[me:d][pd:c][oe:b][md:a]
(;W[md]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[od:b][oe:a]
(;B[oe];W[pc];B[qc];W[me]C[
* GOOD VARIATION *])

(;B[od]C[Black 5 is a mistake.];W[oc]
C['A' is only playable with the ladder, 'B' is always possible.]
LB[oe:B][pc:A]
(;B[pc];W[oe];B[pd]
C[White continues at 'a' with a favorable ladder. If the ladder
is not favorable, White may play 'b', but a fight ensues.]
LB[of:b][nf:a]
(;W[nf]C[White must have the ladder to play this way.])

(;W[of]
C[White does not have a favorable ladder to capture Black 3. A
fight ensues.]
;B[nf];W[ng];B[mf];W[mg];B[lf]
C[White must now cover the cutting point at 'a' while Black aims
at White's stones on the top side.]
LB[og:a])
)

(;B[oe];W[pc];B[qc];W[me])
)
)

(;W[oe];B[od];W[pd];B[oc];W[of]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[md:b][pc:a]
(;B[pc];W[me])

(;B[md]C[Black 9 gives White the advantage.];W[pc];B[nc];W[qe])
)

(;W[pd];B[pe];W[oe];B[of];W[od];B[qe]
C[White continues with 'a *' or 'b'.]LB[ld:b][qc:a]
(;W[qc];B[md];W[mc];B[me];W[lc];B[rc];W[pb];B[qb];W[pc];B[rb]
C[
* GOOD VARIATION *

This result is equal, because Black's wall has a severe weakness.
If he doesn't defend it, White can later attack on 'A'.]
LB[og:A];W[og]C['A' or 'B'.]LB[nf:B][pf:A]
(;B[pf];W[nf];B[ng]C[One possible continuation.];W[mf];B[mg];W[lf];
B[oh])

(;B[nf];W[qg];B[pf])
)

(;W[ld];B[pc];W[nf]C['A' is correct, 'B' starts an unnecessary fight.]
LB[me:B][og:A]
(;B[og]C['A' or tenuki B are ok.]LB[dp:B][me:A];W[me])

(;B[me];W[og];B[pf]
(;W[ng])

(;W[md];B[lf];W[ng])
)
)
)

(;W[me]
C[Black continues with 'a'. Black 'b' is a trick play that can
be foiled.]
LB[oe:b][od:a]
(;B[od]
C[White continues with the tesuji at 'a'. White 'b' is not recommended.]
LB[md:b][oc:a]
(;W[oc];B[nc];W[md];B[ob]
C[White continues with 'a'. White 'b' is a mistake.]LB[pc:b][oe:a]
(;W[oe];B[pc];W[nf])

(;W[pc]C[White 10 is a mistake.];B[pd]C[White may try 'a' or 'b'.]
LB[nb:b][mc:a]
(;W[mc];B[nb];W[mb];B[pb];W[nf]C[White has given up much profit.])

(;W[nb];B[mc];W[pb];B[mb];W[oa];B[kc]
C[White continues at 'a'. White 'b' is a mistake.]LB[rb:b][nf:a]
(;W[nf];B[rb];W[qb];B[rc];W[qa];B[qg]C[Black has a favorable result.])

(;W[rb]C[White 18 is a mistake.];B[nf]
C[Now White's three stones are in a world of hurt.])
)
)
)

(;W[md]
C[White 6 is not recommended.

Black continues at 'a'. Black 'b' is a mistake.]
LB[oe:b][oc:a]
(;B[oc];W[nf];B[oe];W[lg])

(;B[oe]C[Black 7 is a mistake.];W[mg])
)
)

(;B[oe]
C[Black 5 is a trick. White continues with 'a'. White 'b' falls
into the trap.]
LB[od:b][ld:a]
(;W[ld];B[od];W[nc])

(;W[od]C[White hopes for Black 'a', White 'b'.]LB[md:b][pd:a];B[md]
C[Instead, Black cuts.];W[pe];B[pd];W[mc];B[ld];W[le];B[ke]
C[Now White cannot catch Black in any ladder.];W[kf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[pf:b][lf:a]
(;B[lf];W[mf];B[mg];W[lg];B[nf];W[lf];B[lc];W[ng];B[of];W[oc];B[pc];
W[ob]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pb:b][pf:a]
(;B[pf];W[lb];B[kb];W[mb];B[kc];W[pb];B[qb];W[pa];B[mh];W[je];B[hc])

(;B[pb]C[Black 27 leads to a ko that is not favorable for Black.];
W[lb];B[kb];W[nb];B[la];W[ma];B[mb];W[pg]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[og:b][pf:a]
(;B[pf];W[qf];B[qe];W[og];B[pe];W[lb])

(;B[og]C[Black 35 is a mistake.];W[oh];B[nh];W[pf];B[ng];W[ni])
)
)

(;B[pf]C[Black 15 is a mistake.];W[kd];B[lc];W[lb];B[kc];W[jc];B[kb];
W[jb])
)
)
)
)

(;B[pc]
C[
Kosumi = Ibkucha = Jian = Diagonal
-----------------------------------

Black 3 is somewhat slower than the joseki moves, but forces
White to play lightly in the center and disables him to close
off one side for territory in sente. White will probably play
elsewhere. The follow-up is shown.
]
;W[pe];B[qe];W[pg];B[pf];W[of];B[qf];W[ng]
C[Black later plays 'a', but there is no hurry, as Black's corner
is secure. White blocking Black on the right is not a worry for
Black.]
LB[qh:a])

(;B[lc]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

Black 3 is the only pincer against White 2. White aims at the
corner contact play. Black 3 is the only way to forstall that
move.

White continues with 'a *' or 'b'. 'c' aims for influence.
White 'd' is not good.
'e' covers playing elsewhere.
]
LB[dp:e][qc:d][pe:c][oc:b][pd:a]
(;W[pd]
C[Black continues with 'a *' or 'b'. Black 'c' is a slack move.
'd' takes the corner and gives the right side.]
LB[pc:d][qe:c][pe:b][qc:a]
(;B[qc]C[White continues with 'a *' or 'b'.]LB[ld:b][pf:a]
(;W[pf];B[qe];W[mf];B[qg];W[kd]C[
* GOOD VARIATION *])

(;W[ld]C[Black continues with 'a' or 'b'.]LB[pe:b][kd:a]
(;B[kd];W[le];B[mc];W[qe]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[pe:b][pc:a]
(;B[pc];W[pe];B[nc])

(;B[pe]C[Black 11 is a mistake.];W[qf];B[od];W[oe];B[pc];W[pf];B[nc];
W[pd];B[oc]C[White has a better position than the joseki.])
)

(;B[pe];W[mc];B[pg];W[kc])
)
)

(;B[pe]C[White continues with 'a'. White 'b' is an overplay.]
LB[qe:b][qc:a]
(;W[qc]C[Black continues with 'a' or 'b'.]LB[re:b][rc:a]
(;B[rc]
C[White continues with 'a' or 'b'. White 'b' leads to a fight with
equal prospects.]
LB[qe:b][pc:a]
(;W[pc];B[re];W[oe];B[pf];W[id])

(;W[qe]C[White 8 shows fighting spirit.];B[rd];W[re];B[pf];W[qg]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[od:b][pg:a]
(;B[pg];W[qh];B[pc];W[od];B[pb]
C[White next plays 'a' or 'b', depending on the position.]
LB[ph:b][me:a])

(;B[od]C[Black 13 is not recommended, as Black loses the corner.];
W[pc];B[oc];W[ob];B[nc];W[rb];B[nb]
C[White continues with 'a'. White risks a ko playing elsewhere
('b').]
LB[dp:b][pb:a]
(;W[pb])

(;W[tt]C[White plays elsewhere, risking a ko.];B[qb];W[pb];B[ra]
C[White continues with 'a'. White 'a' leads to a two-stage ko.
White 'b' leads to a direct ko.]
LB[sb:b][qa:a]
(;W[qa];B[sb])

(;W[sb];B[pa])
)
)
)
)

(;B[re]
C['A' and 'B' lead to the same position.
'C' is not recommended.]
LB[oc:C][rd:B][pc:A]
(;W[pc];B[oe];W[rd];B[qe];W[mb];B[qj])

(;W[rd];B[qe];W[pc];B[oe];W[mb];B[qj])

(;W[oc];B[rc];W[oe];B[pf];W[qb];B[jd])
)
)

(;W[qe]C[White 6 is unreasonable.];B[qc];W[qf];B[pf];W[pg];B[of]
C[Blackk 11, ironically good shape here (usually bad shape), makes
miai of 'a' and 'b'.]
LB[od:b][qg:a])
)

(;B[qe]C[Black 5 is not recommended.];W[qc];B[rc]C['A' or 'B'.]
LB[pe:B][pb:A]
(;W[pb];B[rb];W[id]
C[White has comfortable shape and can switch to 10.])

(;W[pe];B[qf];W[rb];B[qb];W[pc];B[sb];W[pg])
)

(;B[pc];W[qe];B[od];W[pe];B[oc];W[oe])
)

(;W[oc]
C[White 4 reverts to the small knight approach move with two-space
low pincer joseki, see there for the possible variations to follow
this move.])

(;W[pe]
C[White aims for influence only.

Black continues with 'a' or 'b'.]
LB[qe:b][pd:a]
(;B[pd];W[od];B[qe];W[pf]C['A' is ok, 'B' possible.]LB[qg:B][rg:A]
(;B[rg];W[kd])

(;B[qg]C['A' is usual, 'B' complicated.]LB[hd:B][kd:A]
(;W[kd])

(;W[hd]
C[White 10 presumes White support in the upper left corner.

Depending upon whole board strategy, Black continues with 'a'
to 'c'.]
LB[nf:c][hb:b][le:a]
(;B[le]C[White presses with 'a'. White 'b' is defensive.]
LB[nf:b][mf:a]
(;W[mf];B[jd])

(;W[nf];B[lg];W[oi])
)

(;B[hb]AW[dd]
C[Black 11 aims to live at top, at the cost of giving White thickness.]
;W[hc];B[ib];W[gb];B[jd])

(;B[nf]
C[Black 11, a forcing move, emphasizes the right, at the expense
of Black 3.]
;W[me];B[ph];W[mf])
)
)
)

(;B[qe]
C[Black 5 ends up weakening Black 3, so reflects a change in strategy.]
;W[pd];B[qf];W[qc];B[rc];W[rb];B[qb];W[pc];B[ra];W[og]
C[White can aim at 'a' later.]LB[qg:a])
)

(;W[qc]
C[White 4 is unreasonable.

Black continues with 'a' to take the outside.
Black 'b' takes the corner and is not recommended.]
LB[pc:b][pd:a]
(;B[pd];W[pc];B[oc]
C[White continues with 'a'. White 'b' is submissive.]LB[ob:b][od:a]
(;W[od];B[nc];W[rd];B[re];W[rc];B[pf])

(;W[ob]C[White 8 is submissive.];B[nc];W[nb];B[mc])
)

(;B[pc]C[Black 5 is not recommended.];W[pd];B[pb];W[qe];B[rd];W[pe];
B[rc];W[oc]
C[White gets nice outside shape (even though Black can later connect
underneath at top).])
)

(;W[dp];B[le])
)

(;B[tt]C[
Tenuki
-------

Black plays elsewhere.
];W[qc]
C[Black continues with 'a'. Black 'b' shows White's follow-up if
Black plays elsewhere again. 'c' is slack.]
LB[rc:c][cq:b][pc:a]
(;B[pc];W[pd]
C[Black continues with 'a'. Black 'b' and 'c' are not recommended.]
LB[od:c][rc:b][pb:a]
(;B[pb]
C[White continues with 'a' or 'b'. 
White 'a' ends with White sente.
White must have the ladder to play 'b'.]
LB[qb:b][qe:a]
(;W[qe]
C[Though an equal result, and ending in sente, White 7 is not very
satisfying.]
;B[rd];W[pe];B[rc])

(;W[qb]
C[White must have the ladder to play this way.

Black continues with 'a'. Black 'b' is not recommended.]
LB[rd:b][rb:a]
(;B[rb]C[White continues with 'a' or 'b'. White 'b' starts a fight.]
LB[rd:b][rc:a]
(;W[rc];B[rd];W[sb];B[ra];W[qa];B[nb]
C[White continues with 'a' or 'b'.]LB[od:b][pe:a]
(;W[pe];B[sd];W[qe];B[sc];W[sa];B[rb])

(;W[od]C['A' is correct, 'B' is a mistake.]LB[sd:B][qf:A]
(;B[qf];W[ob];B[oc];W[nc];B[oa];W[mb];B[lb]
C['A' is correct, 'B' is a mistake.]LB[pf:B][sa:A]
(;W[sa];B[pa]
C[White continues with 'a'. White 'b' does not work.

There is a ladder involved that should favor Black.]
LB[ma:b][pf:a]
(;W[pf]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[mc:b][pe:a]
(;B[pe];W[oe];B[qe]
C[White continues with 'a' with a favorable ladder running to the
bottom left, or 'b' the ladder is unfavorable.]
LB[qg:b][ma:a]
(;W[ma]C[White must have the ladder to play this way.];B[mc];W[lc];
B[md];W[kb];B[of];W[ne];B[ld]
C['b' is a ladder that must favor Black for 'a' and 'b' to be miai.]
LB[nf:b][kc:a])

(;W[qg]C[White plays this way when the ladder is unfavorable.];B[rg];
W[rh]
C[Black continues with 'a'. Black 'b' captures the corner, but
gives White superior thickness.]
LB[rf:b][pg:a]
(;B[pg];W[of];B[qh];W[ma];B[mc];W[lc];B[md];W[kb];B[ld];W[la];B[mg]
C[White gets the corner, Black get slightly better influence.])

(;B[rf]C[Black 32 is not recommended.];W[pg];B[sd];W[lc]
C[Locally, White's thickness is better than Black's corner profit.])
)
)

(;B[mc]C[Black gives up the fight.];W[md];B[lc];W[qg];B[qe];W[rf]
C[White 32 ensures capture of the Black stones.];B[pe];W[of])
)

(;W[ma]C[White 26 is a mistake.];B[mc];W[lc];B[md];W[kb]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[ld:b][ne:a]
(;B[ne])

(;B[ld]C[Black 31 is a mistake.];W[la]C[And White wins the fight.])
)
)

(;W[pf];B[pe];W[oe];B[qe];W[qg];B[rg];W[rh];B[pg];W[of];B[qh];W[ma];
B[mc];W[lc];B[md];W[kb];B[ld];W[la];B[mg])
)

(;B[sd];W[sa]C[White can take stones on A or B.]LB[qe:B][ob:A])
)
)

(;W[rd]C[White 9 starts a fight.];B[qe];W[rc];B[nb];W[pe];B[qf];W[sb];
B[lc];W[og];B[ph]
C[White's center stones are hard-pressed, but the overall board
position may make this reasonable.])
)

(;B[rd]
C[Black 8 was once considered joseki, but White gets great shape,
so this sequence is now considered favorable to White.]
;W[oc];B[pe];W[od];B[rb];W[ob];B[rc];W[pa];B[qh])
)
)

(;B[rc]C[Black 7 lacks style, and gives White a better result.];W[qb];
B[pe];W[od];B[re];W[rb];B[sb];W[ob];B[pg])

(;B[od]C[Black 7 is not a good move.];W[pe];B[oc];W[oe];B[rc];W[qb];
B[rb]C[White continues with 'a' or 'b'.]LB[rd:b][qe:a]
(;W[qe];B[rd];W[nc];B[pb];W[ob];B[qa];W[mf])

(;W[rd];B[qe];W[qf];B[re];W[rf];B[sd];W[nc])
)
)

(;B[tt]C[Black plays elsewhere again.];W[pd]
C[This position is the same as Hoshi-Tenuki-Ikkentobi in reversed 
color, for the continuation see the White 34-invasion into a 
Black moyo of the 4-4-point, the 3-10-point and the 4-6-point.

Black continues with 'a' or 'b'.]
LB[qd:1][qe:b][pe:a])

(;B[rc];W[pc];B[re];W[jc])
)

(;B[od]
C[
Tobi-Tsuke (jump attach)
---------------------------

White continues with 'a'. White 'b is a mistake in direction.
]
LB[oe:b][oc:a]
(;W[oc]C[Black continues with 'a' or 'b'.]LB[pc:b][oe:a]
(;B[oe];W[pc];B[qc];W[kc])

(;B[pc];W[oe];B[pd];W[ne])
)

(;W[oe]C[White 4 is a mistake in direction.];B[oc];W[ne];B[nc];W[ld];
B[pe])
)

(;B[nc]
C[Black 3 is an overplay.

White continues with 'a'. White 'b' is submissive.]
LB[mc:b][oc:a]
(;W[oc];B[od];W[pd];B[oe];W[pc]
(;B[pe];W[mc];B[nb];W[mb])

(;B[md]C[Black 9 is a mistake. White gets great profit.];W[pe];B[ne];
W[pf])
)

(;W[mc]C[White 4 is submissive.];B[oc];W[md];B[jd])
)

(;B[ld]
C[
Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia = 1-Space High Pincer
----------------------------------------------------------------------------

'A' or 'B' are ok.
]
LB[oc:B][pd:A]
(;W[pd]C['A' or 'B' are ok.]LB[pe:B][qc:A]
(;B[qc];W[pf];B[qe];W[mf];B[qg];W[ke])

(;B[pe];W[qc];B[re];W[oc];B[rc];W[oe];B[pf];W[qb])
)

(;W[oc]C[Same variation as White 4 played before White 2.]
LB[nd:2][oc:4])
)

(;B[kc]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------
]
;W[pe];B[qe];W[pf];B[qg];W[ke])

(;B[kd]
C[
Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia = 2-Space High Pincer
-----------------------------------------------------------------------------
]
;W[pe];B[qe];W[pf];B[qg];W[hd])
)

(;W[od]
C[
Ikken Takagakari = Hankan Nop'dakeolch'im = Yi Gaogua`jiao~ = 1-Space High Approach
------------------------------------------------------------------------------------

The 5-4 approach move has become more popular in modern times,
as modern Go emphasizes speed and influence.

Black responds at 'a *', 'b *', 'c', 'd *', 'e *', 'f *', 'h', 'i *', 'j *', 'k', 'l', 'm', or plays elsewhere 'o'.
If Black is in the top left corner with a low shimari at the triangled point, Black should not pincer, but play at 'a *'.
If Black is in the top left corner with a high shimari at the squared point, Black should not extend, but play at 'f *'

'a' also covers  the development in the Chinese Fuseki.
Black 'n' is slow.
'g' is a rare move, undecided between the two intentions of putting
pressure on White like with 'f' or influencing the top left side
like with 'h',

k11, j10, i9, h8, g7, f6, e5, d4, c3, b2, a1

outcomes:
a1, b2, c3 - Black right; White top
d3 - Black corner & right; (small, large) Avalanche
e4, f5 - Black choice
i7, k8 - Black right; White top
j6 - Black choice; Magic Sword of Muramasa
l10 - Black corner & sente; White top
m9 - Black corner & right; White top
n11 - various
]
LB[qf:b][pf:a][qg:c][oc:d][oe:e][mc:f][lc:g][kc:h][md:i][ld:j][kd:k][pc:l][pd:m][pe:n][dp:o]
TR[ec]MA[ed]
(;B[pf]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

Black 3 is a peaceful response, aiming to maintain balance with
White's high approach.

White continues with 'a *'. White 'b' and 'c' represents unorthodox
strategies. 'c' appears against the Chinese Fuseki.
Tenuki is a mistake.
]
LB[of:c][qh:b][qc:a][dp:d]
(;W[qc]
C['A *' is joseki, 'B' takes the corner and pushes White to the
right side.
'B' is wrong.]
LB[pc:B][rc:A]
(;B[rc]
C['A *' is usual, 'B' appears the Chinese Fuseki.
In the Kobayashi fuseki, White must flee to 'C', because 2 was wrong.
]
LB[lc:C][pc:A][of:B][od:2]
(;W[pc]C[Black continues with 'a *', 'b *' or 'c'.]
LB[ld:c][rb:b][re:a]
(;B[re]
C['A *' is usual, 'B' is more safe. 'C *' appears in the Chinese
Fuseki.]
LB[mc:C][lc:B][kc:A]
(;W[kc]C[Later, Black can play 'A' or 'B'.

* GOOD VARIATION *]
LB[ic:B][ne:A]
(;B[ne]C[Continuation. White continues with 'a' or 'b'.]LB[oe:b][mc:a]
(;W[mc];B[ld];W[lc])

(;W[oe];B[of];W[nf];B[me];W[mc];B[ld];W[lc];B[ng])
)

(;B[ic]C[White answers on 'A', tenuki 'B' is not good.]LB[dp:B][ke:A]
(;W[ke])

(;W[dp];B[mc];W[md];B[lc];W[ld];B[kb];W[kd];B[jc])
)
)

(;W[lc]C[White can no more be attacked.])

(;AB[kc]AW[pp];W[mc];B[qn];W[nq];B[nf]
C[This is also and especially the correct move if Black is already 
on the triangled position.]
TR[pj];W[me];B[ne];W[nd];B[ld];W[kb];B[jb];W[lb];B[jc];W[md];B[pj]
C[
* GOOD VARIATION *])
)

(;B[rb]
C['A *' is usual. In the Chinese Fuseki, only 'B *' is possible.]
LB[mc:B][kc:A]
(;W[kc]
C[Black extends to 'a *', or, with support in the top-left corner,
may play 'b'. If 'b' doesn't work (because of lack of support),
Black may press at 'c'.]
LB[ne:c][ic:b][qj:a]
(;B[qj]C[
* GOOD VARIATION *])

(;B[ic]AB[dd]
C[Black may play 9 as a check if there is Black support in the
top-left corner. White must reply; 'a' is suitable. White cannot
afford to play elsewhere ('b').]
LB[dp:b][ke:a]
(;W[ke])

(;W[tt]C[White plays elsewhere, a mistake.];B[mc];W[md];B[lc];W[ld];
B[kb];W[kd];B[jc];W[nc])
)

(;B[ne]
C[White may submit with 'a'. If the ladder to the bottom left corner
favors White, White may resist with 'b'.]
LB[oe:b][mc:a]
(;W[mc]C[White plays 10 when the ladder is unfavorable.];B[ld];W[lc])

(;W[oe]C[White must have the ladder to play this way.];B[of];W[nf]
C[White 12 must not be able to be caught in a ladder.];B[me];W[mc]
C[White 14 can only be played if White 12 cannot be captured in
a ladder.]
;B[ld]C[Black 16 takes care of the ladder issue for White 12.];W[lc]
C[White might like to resist with 'a', but White 16 is correct.]
LB[ng:a];B[ng]
C[White 12 can be captured because of the Black 15, White 16 exchange.

White has territory in sente, Black has thickness: a fairly even
exchange.]
;W[mf];B[lg])
)
)

(;AB[kc];W[mc];B[nf];W[me];B[ne];W[nd];B[ld];W[kb];B[jb];W[lb];B[jc];
W[md]C[
* GOOD VARIATION *])
)

(;B[ld]C['A' or 'B' are possible.]LB[rb:B][qe:A]
(;W[qe]C['A' or 'B' are possible.]LB[pe:B][re:A]
(;B[re];W[pd];B[rd];W[qf]LB[qf:12][pd:10]
C[White 10 and 12 are oftenly played in reversed order.
];B[pe];W[qg];
B[pg];W[qh]C['A' is correct, 'B' is a mistake.]LB[ph:B][qb:A]
(;B[qb];W[pb];B[qa];W[me]PL[2]LB[rf:A];B[ng]
C['A' is correct, 'B' is a mistake.]LB[oi:B][le:A]
(;W[le]C['A' or 'B' are possible.]LB[jd:B][ph:A]
(;B[ph];W[kd];B[qi])

(;B[jd];W[pj])
)

(;W[oi];B[ph];W[pi];B[qi])
)

(;B[ph]C['A' kills, 'B' dies.]LB[rf:B][rb:A]
(;W[rb];B[qi];W[ri]C[Neither 'A' nor 'B' work.]LB[rf:B][rh:A]
(;B[rh];W[rg];B[rj];W[sh];B[qj];W[sf];B[rf];W[sc];B[sj];W[si])

(;B[rf];W[qj];B[pi];W[rh])
)

(;W[rf];B[qb];W[pb];B[qa];W[sb];B[rb];W[sa];B[se];W[sc];B[qi];W[ri];
B[rj];W[qj];B[pi];W[sh];B[rk];W[rg];B[sf])
)
)

(;B[pe];W[rd];B[pd]C['A' or 'B' are ok.]LB[re:B][rb:A]
(;W[rb]C['A' is correct, 'B' is questionable.]LB[re:B][oc:A]
(;B[oc]C['A' is correct, 'B' is questionable.]LB[nc:B][ob:A]
(;W[ob];B[nc];W[nb];B[mc];W[re])

(;W[nc];B[ob]C['A' or 'B' don't help much.]LB[nb:B][pb:A]
(;W[pb];B[nd];W[oe];B[nb];W[mc];B[mb];W[lc];B[pa];W[sc];B[md])

(;W[nb];B[qb];W[sc];B[pb];W[rc];B[nd];W[oe];B[mc])
)
)

(;B[re];W[sc])
)

(;W[re];B[oc]C['A' is honest, 'B' just takes less territory.]
LB[nc:B][ob:A]
(;W[ob];B[nc];W[rb])

(;W[nc];B[ob];W[rb];B[qb];W[sc];B[pb];W[rc];B[nd];W[oe];B[mc])
)
)
)

(;W[rb];B[qj]C[Later White A]LB[re:A])
)
)

(;W[of];B[og]LB[qc:4][of:6]
C[Same position as White 6 played before 4, see there for continuation.
])

(;AW[dp][pp][nq]AB[dd][pj][qn];W[lc];B[pc];W[ic])
)

(;B[pc];W[pd];B[rc];W[qb];B[pb];W[rb])
)

(;W[qh]
C[White 4 is a tough-minded move. 

Rin Kaiho played White 4 against Yoshio Ishida in the 3rd game
of the 1974 Oza title match.]
;B[ld];W[qe];B[pe];W[pd];B[qc];W[re];B[ne];W[pb];B[qb];W[nb];B[rd];
W[qg];B[mc]C[White continues with 'a'. White 'b' is a mistake.]
LB[nd:b][lc:a]
(;W[lc]
C[White 18 is the tesuji that lets top White group live.

Black continues with 'a'. Black 'b', letting White live in the
corner, is too mild.]
LB[oc:b][pc:a]
(;B[pc];W[oc];B[pa];W[mb];B[kc];W[lb];B[ob];W[md];B[le]
C[The cut of 'a' is correct. In the actual game, White played 'b'.]
LB[oe:b][kd:a]
(;W[kd])

(;W[oe];B[of];W[nf];B[og];W[ng];B[nh];W[lf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[oi:b][pi:a]
(;B[pi]
C[Black can capture the White group on the right side with Black
35.];
W[me]C[White must play 36.];B[qi]C[White cannot live on the right.])

(;B[oi]
C[Black 35, the play in the game from which this variation is taken,
is a mistake.]
;W[me])
)
)

(;B[oc]C[Black 19 lets White live in the corner.];W[pc];B[nc];W[mb])
)

(;W[nd]C[White 18 is a mistake.];B[me];W[lc];B[kc];W[lb];B[md];W[mb];
B[kb]
C[White pushing through at 'a' and then cutting does not work.
White loses the fight in the corner, so the situation is hopeless
for White.]
LB[oe:a])
)

(;W[of]LB[og:A][oe:B]
C['A' is usual, 'B' is possible, if Black is strong.
]
(;B[og];W[qc]
(;B[rc];W[rd]
C[Black continues with 'a' to surrender the corner, or 'b' to take
the right. 'c' is a mistake.]
LB[re:c][pd:b][qe:a]
(;B[qe]C[Black gives away the corner for the sides.];W[rb];B[pc];W[qb]
;B[pd];W[re];B[rf];W[pb];B[oc])

(;B[pd]
C[Black takes the corner and the right side.
'A' is the only move, 'B' is wrong.
]
LB[pc:A][rb:B]
(;W[pc]LB[rb:A][re:B]C['A' or 'B' are ok.
]
(;B[rb]
C['A' if the top side is still empty, else (e.g. in the Chinese Fuseki) 'B'.
]
LB[re:B][nc:A]
(;W[nc];B[re];W[nf];B[pg];W[kc])

(;AB[kc];W[re];B[qf];W[nc];B[rf]LB[qb:A][nf:B]C['A' or 'B' or ok.
]
(;W[qb])

(;W[nf])
)
)

(;B[re];W[rb];B[sd];W[nc])
)

(;W[rb];B[pc];W[qb]LB[of:4]
C[Now White 4 has been a helping move, only strengthening Black..
])
)

(;B[re];W[qe];B[sd];W[qf];B[pe];W[pd];B[qg];W[rd])
)

(;B[pd];W[pc];B[oe];W[nd];B[me])
)

(;B[oe]LB[pe:A][ne:B]
C['A' goes for territory, 'B' for influence. 'B' is not recommended.
]
(;W[pe];B[ne];W[pd];B[qe];W[qc];B[rc])

(;W[ne];B[pe]LB[nd:A][og:B]C['A' or 'B'.
]
(;W[nd])

(;W[og];B[nd])
)
)
)

(;W[tt]C[Playing elsewhere is bad.
];B[ld]
C[Punishment. For continuation see the variation of Black 5 played before Black 3.
]
LB[ld:5][pf:3])
)

(;B[qf]
C[
Ikken Biraki (1-space extension)

Compared to Black 3 onto A this move has the advantage of safety,
as the Black group can no more be attacked from the lower right,
and the disadvantage of renouncing influence and continuations
into the center.
]
LB[pf:A][qf:3];W[qc]
C[Black continues with 'a *'. 'b' was once considered to be joseki, but is inferior, only good in a special case.
]
LB[pc:b][rc:a]
(;B[rc];W[pc]C['A *' is usual, 'B' is possible.]LB[qi:B][rb:A]
(;B[rb];W[kc]C[
* GOOD VARIATION *])

(;B[qi];W[rb])
)

(;B[pc]
C[Black 5 looks like a trick play, and to the extent that White
must answer carefully, it is.]
;W[pd];B[qb]
C[White continues with 'a'. White 'b' is not recommended. White
must have the ladder to play 'b'.
]
LB[qe:b][rc:a]
(;W[rc]C[Black continues with 'a'.
'b' is a trick play.
]
LB[pe:b][rd:a]
(;B[rd]C[White continues with 'a'. White 'b' is a mistake.
]
LB[pb:b][oc:a]
(;W[oc];B[pb];W[ob];B[rb]LB[kc:A][ic:B]
C[If White gets 'A', the result is inferior, but there's a case where Black made the right choice.
]
(;W[kc]TR[ob]
C[White has got the triangled second line move for free, and Black has 2 points less compared to similar variations, which are joseki.
])

(;AW[qm][pp]AB[kc]LB[pc:5]
C[In this case, extending to the right side is not important because of the White low position in the lower right, and White cannot get his extension. So here, Black 5 was the best choice.
]
;W[ic];B[ke]C[White in trouble.
])
)

(;W[pb]
C[White 10 is a mistake.

White can be confined to small life in the corner.]
;B[oc];W[rb]
C[Black continues with 'a' to confine White to the corner, or 'b'
to string White out.]
LB[nc:b][ob:a]
(;B[ob];W[qa];B[mc])

(;B[nc];W[nd];B[mc];W[md];B[lc]
C[White continues with 'a'. White 'b' is a mistake.]LB[ke:b][sd:a]
(;W[sd]C[White 18 is necessary to make life in the corner.];B[ld])

(;W[ke]C[White 18 is a mistake.];B[qa];W[ra];B[sc]
C[White dies. White cannot block at the mark, so cannot make two
eyes.]
CR[sb])
)
)
)

(;B[pe]C['A' is correct, 'B' is getting tricked.]LB[oc:B][pb:A]
(;W[pb];B[oc];W[ob];B[nc];W[nd];B[mc];W[md];B[lc];W[rb])

(;W[oc];B[pb]
C[White continues with 'a'. White 'b', attempting to capture the
three Black stones, does not work.]
LB[rd:b][ob:a]
(;W[ob];B[rb];W[kc])

(;W[rd]
C[White 12 is a mistake. White cannot capture the three Black corner
stones.]
;B[qe];W[rb];B[ob];W[nb];B[nc];W[mb];B[nd];W[oe];B[nf]
C[Black 21 is the tesuji that kills White.])
)
)
)

(;W[qe]
C[White 8 is not recommended. White must have the ladder to play
this way.]
;B[rc];W[rd];B[qc];W[pe];B[re];W[rf];B[sd];W[qg]
C[The result must be consider unfavorable to White.

Black has a large corner. Black gets to play a ladder block.
The four White stones do not make a good shape.])
)
)

(;B[qg]
C[
Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
-------------------------------------------------------------
]
;W[pf];B[qf];W[qc];B[rc];W[pd];B[qe];W[pb];B[qb];W[pc];B[rb];W[kc])

(;B[oc]
C[
Tsuke-Hiki = Attach to draw back
-----------------------------------

Black 3 is the most orthodox reply to White 2.

White continues with 'a *', 'b *' or 'e'. 

White 'b' leads to the avalanche pattern, which has complex variations.
Black has the initial choice of joseki with this pattern. The
outcome is typically Black gets the corner and out on the side,
White thickness.

White may also play elsewhere ('c'). 

White 'd' is sometimes played in amateur games.

White 'e' is played by professionals who don't want an immediate
decision which joseki shall be played.
]
LB[nd:e][pc:d][dp:c][pd:b][nc:a]
(;W[nc]C[Black continues with 'a *' or 'b *'.
'c' is a mistake.]
LB[pd:c][ob:b][pc:a]
(;B[pc]
C[White continues with 'a *', 'b *' to 'd', or plays elsewhere
'e *' if he has or easily gets the ladder.]
LB[dp:e][ng:d][nf:c][nd:b][md:a]
(;W[md]
C[Black continues with 'a *', plays elsewhere ('b') (at the risk
of fighting), peeps at 'c *', or blocks White's extension with
'd', starting a fight.

Black 'e' is not recommended.]
LB[pe:e][jd:d][ne:c][dp:b][qf:a]
(;B[qf]
C['A *' is usual. 'B' only with an additional stone on the triangled
position.]
LB[gc:B][ic:A]TR[dd]
(;W[ic]C[
* GOOD VARIATION *];AB[dd];B[gc]
C[If Black approaches, White defends with A.
White may also play tenuki, if he has learned the joseki after
the Black invasion on 'B *'.]
PL[2]LB[lc:B][ie:A]
(;W[ie])

(;B[lc];W[mb]C['A *' goes for influence, 'B *' for territory.]
LB[jb:B][jd:A]
(;B[jd];W[jc];B[kc];W[kb];B[lb];W[la];B[jb];W[ka];B[id];W[ib];B[hc];
W[hb];B[gb];W[le]C[
* GOOD VARIATION *])

(;B[jb];W[pe];B[qe];W[kd];B[jd];W[jc];B[kc];W[ke];B[ib];W[hc]
C['A *' is usual.
With the ladder to the right side, Black plays'B'.]
LB[hd:B][hb:A]
(;B[hb];W[ie]C[
* GOOD VARIATION *])

(;B[hd];W[id];B[ie];W[hb]
C[If Black has the ladder, Black captures with 'A'.
If he hasn't, the ladder breaker 'B' won't help him much.]
LB[le:B][gb:A]
(;B[gb];W[ha];B[je];W[he];B[gd];W[if])

(;B[le]C[White plays 'A'. 'B' simply fails to avoid a big loss.]
LB[ld:B][je:A]
(;W[je];B[ld]
C[White sacrifices the stones to the right to build center influence
and has various cuts to the left, so he isn't disappointed with
this result.])

(;W[ld];B[gb];W[ha];B[je];W[he];B[gd];W[if];B[jf];W[jg];B[kf];W[lf];
B[kg];W[kh];B[lg])
)
)
)
)
)

(;AW[dd];W[gc];B[jd];W[ng];B[jg];W[pg];B[qg];W[ph])
)

(;B[tt]C[Black plays elsewhere.];W[qe]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[re:b][pd:a]
(;B[pd];W[pe];B[oe];W[nd];B[re];W[rf];B[rd]
C[White continues with 'a' or 'b'.]LB[qg:b][pg:a]
(;W[pg]
C[If Black plays elsewhere, White is well advised to capture Black
10 with 'a'.]
LB[nf:a])

(;W[qg];B[of];W[pg]
C[If Black plays elsewhere, White can capture the two Black stones
with 'a'.]
LB[ng:a])
)

(;B[re]C[Black 8, crawling along the second line, is not recommended.]
;W[pd];B[rc];W[qf];B[rf];W[qg])
)

(;B[ne]
C[White can respond with 'a *' to 'c *', but White 'c' is not recommended
unless the top is important.]
LB[me:c][oe:b][nd:a]
(;W[nd]
(;B[pe];W[ic]
C[
* GOOD VARIATION *

White continues with 'a'. Black should not play elsewhere ('b').]
PL[2]LB[dp:b][qj:a]
(;B[qj])

(;B[tt]
C[Black plays elsewhere. White plays an extension block at 'a',
or the pushing probe of 'b'.]
LB[oe:b][qj:a]
(;W[qj]
C[A Black extension to the marked location is a bit small. Black
plays elsewhere again.]
CR[qh];B[tt]C[Black plays elsewhere.];W[qf];B[pf];W[qg];B[qe])

(;W[oe]
C[Black continues with the fighting move of 'a', or peaceably with
'b'.]
LB[pf:b][of:a]
(;B[of]C[Black 12 is a fighting answer. Black loses the corner.];W[pf]
;B[pg];W[qf];B[qg];W[rf];B[rg];W[pd];B[qe];W[qc]
C[Black continues with 'a' and gets sente. Black 'b' gains about
13 points, but loses sente. Black 'a' is recommended during fuseki.]
LB[rc:b][re:a]
(;B[re];W[rc])

(;B[rc]
C[Black 22 gains Black about 13 points over immediately capturing
the three White stones, but Black ends in gote in this variation,
so this variation is not recommended.]
;W[qb];B[re];W[tt]C[White plays elsewhere.];B[rb]
C[Black's priviledge.];W[ob];B[qa];W[pb])
)

(;B[pf]C[Black 12 is peaceful.];W[ng])
)
)
)

(;B[oe]
C[Black 9 is insensibly heavy. White emphasizes the top with 'a',
or forces with 'b'.]
LB[pd:b][me:a]
(;W[me];B[pd];W[mg])

(;W[pd];B[pe];W[qe];B[qc];W[qf];B[nb];W[mb];B[oa];W[ph])
)
)

(;W[oe];B[nb]C[White continues with 'a'. White 'b' is a mistake.]
LB[mb:b][nf:a]
(;W[nf];B[mb];W[qe];B[re];W[qg])

(;W[mb]C[White 10 is a mistake.];B[nd];W[mc];B[of])
)

(;W[me]
C[White 8 is a special strategy, playable only if White benefits
from influence to the top side, as locally White suffers a signifcant
loss.]
;B[nb];W[mb];B[nd];W[mc];B[nf]
C[White continues with 'a'. White 'b' is a mistake.]LB[hc:b][mg:a]
(;W[mg];B[ng];W[nh]C['A *' or 'B'.]LB[mf:B][oh:A]
(;B[oh];W[ni];B[mf];W[lf];B[lg];W[mh];B[kf];W[le];B[ph];W[pj]
C['A' is correct, 'B' is questionable.]LB[kg:B][qh:A]
(;B[qh];W[kg]C[
* GOOD VARIATION *])

(;B[kg];W[jd];B[ki];W[og];B[oe];W[qh];B[qg];W[qi];B[rg]
C[If White can extend from one of his two groups in sente, he is
well.])
)

(;B[mf];W[lf];B[oh]C['A' or 'B'.]LB[ni:B][mh:A]
(;W[mh];B[oi])

(;W[ni];B[lg];W[mh];B[kf];W[le])
)
)

(;W[hc]C[White 14 is a mistake.];B[mf])
)
)

(;B[jd]C[Black provokes a fight.];W[qe]
C['a' is correct, 'b' is not recommended.]LB[re:b][pd:a]
(;B[pd];W[pe];B[oe];W[nd]C[Black 'a' or 'b'.]LB[re:b][of:a]
(;B[of]C[White continues with 'a'. White 'b' is a mistake.]
LB[rd:b][re:a]
(;W[re];B[rd];W[qh];B[mf];W[qb];B[rb];W[ra];B[sb];W[ke];B[je]
C[White continues with 'a' to take territory at top, 'b' to get
out to the center.]
LB[lf:b][kd:a]
(;W[kd]C[White 24 goes for territory.];B[kf];W[jc];B[ic];W[ib];B[hc];
W[hb];B[gc];W[gb];B[fc];W[pj])

(;W[lf]C[White 24 leaves White an opening to the center.];B[lg];W[kf])
)

(;W[rd]C[White 14 is a mistake.];B[rc];W[re];B[qb];W[qh];B[mf]
C[White 'a' is no longer sente. The White group at top is in trouble.]
LB[nb:a])
)

(;B[re];W[rf];B[rd];W[of];B[qf];W[ne];B[qg])
)

(;B[re]
C[For continuation, see the variation where Black played elsewhere 
instead of Black 7.]
LB[jd:7])
)

(;B[pe]
C[If Black wants to play 7, Black should first peep. This variation
presents no advantage to Black.]
;W[ic];B[ne];W[me];B[nb];W[mb];B[nd];W[mc];B[nf]
C[Looking at shape, Black 7 would be better placed at the marked
location.]
LB[pe:7]TR[mf])
)

(;W[nd]
C['a *' is usual. 'b *' is used for making a larger moyo on the
right side, esp. if Black already has a stone on or near the
triangled position.
'c' and 'd' are not recommended.]
LB[qg:d][kd:c][pe:b][qf:a]TR[qj]
(;B[qf]C['A *' or 'B'.]LB[jd:B][jc:A]
(;W[jc]C[
* GOOD VARIATION *

Later, Black may approach on 'A'.]
LB[hc:A];AB[dd];B[hc]
C[White jumps to 'A' or invites a Black invasion by playing tenuki
'B'.]
LB[dp:B][je:A]
(;W[je])

(;W[dp];B[lc]C['A' or 'B'. 'C' is not recommended.
]
LB[ld:B][pd:A][kd:C]
(;W[pd]C['A' is correct, 'B' is questionable.]LB[pe:B][qc:A]
(;B[qc];W[ld]C['A' or 'B'.]LB[kc:B][lb:A]
(;B[lb];W[kd];B[nb]PL[1]LB[og:A][me:B]
C[White 'A' oder later Blck 'B'.
]
(;W[og])

(;B[me];W[md];B[of])
)

(;B[kc];W[kd];B[jb];W[ib];B[ic];W[jd];B[lb];W[og])
)

(;B[pe];W[nb];B[qb];W[kc])
)

(;W[ld]LB[lb:A][kc:B]C['A' or 'B'.
]
(;B[lb];W[kd];B[nb]PL[1];B[me]C[Later
];W[md];B[of])

(;B[kc]C['A' is correct, 'B' is not recommended.]LB[jd:B][kd:A]
(;W[kd];B[jb])

(;W[jd];B[kd];W[ke];B[lb])
)
)

(;W[kd];B[ld];W[le];B[lb]LB[me:A][nb:B]
C[White 'A' is ok, 'B' is not recommended.
]
(;W[me];B[nb])

(;W[nb];B[jb];W[ib];B[ic];W[kb];B[kc];W[ja];B[jd];W[ke];B[jb]
C[White has very low chances to win the ko, so the result is advantageous for Black.
])
)
)
)

(;W[jd]C[Later, Black may approach on 'A'.]LB[hc:A];AB[dd];B[hc]
C[White answers on 'A' or invites an invitation by playing tenuki
'B'.]
LB[dp:B][he:A]
(;W[he]C['A' is correct, 'B' helps White's shape.]LB[fd:B][fc:A]
(;B[fc];W[ic];B[hd];W[ie]C[Later, A is a good point for White.]
LB[og:A])

(;B[fd];W[gc];B[gd];W[hd]C['A' is usual, 'B' or 'C'.]
LB[hb:C][ic:B][gb:A]
(;B[gb];W[ic];B[fc])

(;B[ic];W[gb])

(;B[hb];W[ic];B[gb])
)
)

(;W[dp]C['A' is the correct invasion, 'B' is wrong.]LB[lc:B][ld:A]
(;B[ld];W[lc];B[kc];W[kd];B[lb];W[mc];B[jc];W[id];B[hd])

(;B[lc];W[ld];B[kc];W[kd];B[jc];W[id])
)
)
)

(;B[pe]C['A' or 'B'.]LB[jd:B][jc:A]
(;W[jc]
C[
* GOOD VARIATION *

Black wants to play 'A'. If he omits it, later White might play
'B' or 'C'.]
PL[2]LB[pd:C][qf:B][qj:A]
(;B[qj])

(;AW[qj]PL[2];W[qf];B[pf];W[qg];B[qe])

(;W[pd]
(;B[qc];W[pf])

(;B[qf];W[qc];B[qb];W[rc];B[rb];W[nb];B[pa])
)
)

(;W[jd])
)

(;B[kd]
C[Black 7 is a strange move, so close to White's solid connnection.];
W[qe]C['A' secures Black. 'B' is questionable.]LB[pd:B][re:A]
(;B[re];W[pd];B[rc];W[qf];B[rf];W[qg])

(;B[pd];W[pe]
C[Against White there is the cut on A, but against Black, B is
sente.]
PL[2]LB[ob:B][oe:A];W[ob];B[pb];W[nb];B[rb])
)

(;B[qg];W[jc]PL[2];W[qe]C[Later, White presses Black down.];B[re];
W[pe];B[rf])
)

(;W[nf]AB[jd]
C[White 6 or 'a' is a special move influenced by the situation
at the top. If Black has a stone close to the side handicap stone
(as shown), White 6 may be a good, light move.]
LB[ng:a];B[nb]AB[jd]C[White continues with 'a' or 'b'.]LB[qf:b][mc:a]
(;W[mc];B[mb];W[lc]C[This sequence favors White.])

(;W[qf]C[White switches to the right side.];B[mc];W[pj])
)

(;W[ng]C['A' is correct, tenuki 'B' and 'C' are mistakes.]
LB[nd:C][dp:B][qg:A]
(;B[qg])

(;B[dp];W[qg];B[nb];W[mc];B[mb];W[lc])

(;B[nd];W[md];B[ne];W[me];B[mc];W[nb];B[oe];W[lc])
)

(;W[tt]
C[White plays elsewhere.

Black continues locally at 'a *' or 'b'.]
LB[jd:b][nd:a]
(;B[nd];W[mc]
C[White must have the ladder to capture Black 6 to play this way,
or make a submissive move later.

Black continues with 'a *' or 'b'. 'c' is possible.]
LB[lc:c][md:b][ne:a]
(;B[ne];W[jc]C[
* GOOD VARIATION *])

(;B[md]
C[White continues with 'a' with a favorable ladder, or 'b' or 'c'
if not.]
LB[kc:c][lc:b][ld:a]
(;W[ld]C[White must have the ladder to play this way.];B[lc];W[lb];
B[kc];W[kd]
C['A' is correct, but depends on the ladder C. 'B' is wrong.]
LB[ne:C][mb:B][kb:A]
(;B[kb];W[ne])

(;B[mb];W[nb];B[oe];W[ic]C[White 17 keeps Black in check.];B[kb];W[ma]
;B[ib];W[jd]
C[White 21 is the tesuji.

Black may try 'a' or 'b'. Neither work.]
LB[hb:b][jb:a]
(;B[jb];W[hb])

(;B[hb];W[jb])
)
)

(;W[lc]
C[White must play 9 here if White cannot capture the two Black
stones at top in a ladder.]
;B[oe];W[ic];B[ld];W[kd];B[ke];W[jd])

(;W[kc];B[ld])
)

(;B[lc]C['A' gives more influence than 'B'.]LB[md:B][ld:A]
(;W[ld];B[md];W[me];B[ne];W[nf];B[oe];W[of];B[pe];W[kc];B[lb];W[kb];
B[nb];W[le])

(;W[md];B[ne];W[ld];B[kc];W[kd];B[jc])
)
)

(;B[jd];W[nf])
)
)

(;B[ob]
C[Black 5 was one of Kitani Minoru's favorite moves. White can
answer at 'a *', 'b *' or 'c'. White 'd' is not recommended.]
LB[pd:d][ne:c][oe:b][nd:a]
(;W[nd];B[pd];W[jd]C[
* GOOD VARIATION *])

(;W[oe]
C[White 6 was an invention of Wu Qingyuan = Go Seigen. Black continues with 'A *'. 'B' is surrounded by the opponent.
]
LB[pd:B][pf:A]
(;B[pf]
C[Black 7 may have been an innovation by Fujisawa Shuko = Fujisawa Hideyuki in 1965.]
;W[nb];B[pd];W[me]C[
* GOOD VARIATION *])

(;B[pd]C['A' punishes, 'B' reverts to joseki.]LB[nb:B][pf:A]
(;W[pf];B[nb];W[mc])

(;W[nb];B[pf]C['A' or 'B'.]LB[jd:B][me:A]
(;W[me])

(;W[jd])
)
)
)

(;W[ne]C[White 6 was invented by Takagawa Kaku.];B[pd];W[pe];B[qe];
W[pf];B[qf];W[pg])

(;W[pd]
C[White 6 looks like good shape, but gives White heavy shape in
this instance.]
;B[qc]C['A' or 'B'.]LB[pf:B][nd:A]
(;W[nd];B[pf])

(;W[pf]C[Black continues with the cut of 'a'. Black 'b' is too mild.]
LB[qe:b][nd:a]
(;B[nd]C['A' or 'B'.]LB[mc:B][nf:A]
(;W[nf];B[md];W[qe]C[In spite of White 12, the result favors Black.])

(;W[mc];B[ne];W[kd];B[of];W[qe];B[pg];W[qg];B[qh];W[rh];B[ph];W[rf];
B[re];W[pe];B[rd];W[qj];B[nh])
)

(;B[qe]C[Black 9 is not recommended, as it is too mild.];W[nf];B[qg])
)
)
)

(;B[pd]C['A' is correct, 'B' is a mistake.]LB[oe:B][ob:A]
(;W[ob]C['A' or 'B'.]LB[oe:B][pc:A]
(;B[pc];W[nd];B[pg];W[jd])

(;B[oe];W[pc];B[nd];W[oc];B[ne];W[qc]C[The cut A remains.]LB[pe:A])
)

(;W[oe];B[ob])
)
)

(;W[pd];B[pc];W[qe]
C[
Nadare = Nunsataehyeong = Xue~beng = Avalanche = Lawine
--------------------------------------------------------

Black can respond 'a *', 'b *', 'c *' or 'd *'.
Black 'a' is peaceful;
'b' avoids all complications;
'c' is the small avalanche = ko-nadare;
Black 'd', White 'c' gives the large avalanche = oo-nadare.

Black must have the ladder to play 'c'.

After 'c' there are no more simplifying variations, but the small
avalanche isn't too complicated.
After 'd' there are many complications, but White still can choose
a simplifying variation.

About the large avalanche joseki, Takemiya Masaki 9P spoke to
Jan van der Steen: "I will never play nadare in my life again.
I don't like large scale joseki since it's complicated and it
settles too much of the board. For beginners I recommend just
to play the simple variation ('b')."

Black 'e' is sometimes seen in amateur games.

e5, d4, c3, b2, a1
]
LB[rd:e][nc:d][nd:c][qc:b][re:a]
(;B[re]
C[Joseki continues with White 'a *'. White 'b' is also possible.]
LB[qf:b][rd:a]
(;W[rd];B[qc];W[rf]C[Black continues with 'a *' or 'b'.]LB[pe:b][nd:a]
(;B[nd];W[pf]
C[
* GOOD VARIATION *

Black continues with 'a', plays elsewhere ('b'). Black 'c' is
not compelling.]
LB[ne:c][dp:b][of:a]
(;B[of]
C[Continuation. White continues with 'a'. White 'b' is submissive.
White 'c' is unreasonable.]
LB[ne:c][pg:b][og:a]
(;W[og]C[Black continues with 'a'. Black 'b' is weak.]LB[ne:b][ng:a]
(;B[ng]C[White plays safe with 'a', or strongly with 'b'.]
LB[nh:b][oh:a]
(;W[oh]C[Black continue with 'a'. Black 'b' is an overplay.]
LB[nh:b][ne:a]
(;B[ne];W[nh])

(;B[nh];W[ni]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[mi:b][ne:a]
(;B[ne];W[mi])

(;B[mi]C[Black is ready to be cut up.];W[mj])
)
)

(;W[nh]C[White 16 is a strong way of playing.];B[pe]
C[This continuation is from Sugiuchi versus Maeda, 1955.];W[oe];B[nf];
W[ne];B[me];W[pe];B[pg];W[se];B[oh];W[md];B[nc];W[mf];B[le];W[mg];
B[og];W[qg];B[mh];W[kf];B[ni];W[kd];B[ld];W[lc];B[mc];W[ke];B[kc];
W[lb];B[jc];W[ki])
)

(;B[ne];W[ng];B[pe]
C[Black should not be so concerned about two stones.];W[qf]
C[White has good shape.])
)

(;W[pg]C[White 14 is submissive.];B[ne];W[pe];B[rc])

(;W[ne]
C[White 14 is unreasonable. Black 13 is the vital point precisely
because White 14 is impossible.

Black continues with 'a'. White 'b' is a mistake.]
LB[md:b][me:a]
(;B[me];W[nf];B[oe];W[pe];B[og]C[White faces a difficult fight.])

(;B[md]C[Black 15 makes White's impossible move possible.];W[oe])
)
)

(;B[tt]C[Black plays elsewhere.];W[rc]
C[Black continues with 'a' or 'b'.]LB[of:b][mc:a]
(;B[mc])

(;B[of]
C[White continues with 'a' to emphasize the right, or 'b' to take
corner profit at the expense of thickness.]
LB[nc:b][og:a]
(;W[og];B[ng];W[oh];B[ne];W[pe]
C[White must connect with 20 because he is aiming at the cutting
point of 'a'.]
LB[nc:a];B[lc])

(;W[nc];B[mc];W[nb];B[mb];W[ob];B[pe];W[oe];B[ne];W[pe];B[pg];W[se];
B[nf]C[White's corner profit exceeds Black's thickness.])
)
)

(;B[ne]C[White continues locally with 'a', or plays elsewhere ('b').]
LB[dp:b][of:a]
(;W[of];B[rc]
C[Black 15 is not urgent.

Early in the game, White is better advised to play elsewhere
than take at 'a'.]
LB[se:a])

(;W[tt]C[White plays elswhere.];B[pe]
C[White continues with 'a'. White 'b' is a mistake.]LB[oe:b][se:a]
(;W[se];B[of];W[pg])

(;W[oe]C[White 15 is a mistake.];B[of];W[pe];B[pg];W[se];B[qg])
)
)
)

(;B[pe];W[qf];B[nd];W[oe]
C[Black 11 retains potential, but it should not be played immediately.

Black continues with 'a'. 
Black 'b' immediatley is premature, but may make sense later.
Black 'c' is a tesuji. 
Black 'd' is meaningless.]
LB[ne:d][nf:c][pf:b][jc:a]
(;B[jc]
C[Black 15 is a good extension that retains Black 15's potential];
W[of])

(;B[pf];W[pg];B[of];W[ne];B[og];W[md];B[nc];W[me];B[ph];W[qg];B[nh];
W[mc];B[rc];W[qh];B[pi];W[qi];B[pj];W[se])

(;B[nf];W[of];B[og];W[ng];B[ne];W[pf];B[oh])

(;B[ne]
C[Black 15 is a mistake. Black is just helping White improve his
shape.]
;W[of];B[nf])
)
)

(;W[qf]
C[White 8 was played by Wu Qingyuan = Go Seigen against Karigane Junichi on February
25, 1942.]
;B[nd];W[qc];B[rd];W[qb];B[pb];W[nc];B[nb];W[mc];B[ne];W[of];B[rb];
W[pa];B[ob];W[mb];B[rc];W[nf];B[ld];W[lf];B[le];W[jc])
)

(;B[qc];W[nd]
C[White 8 is the only move.

Black continues with 'a *' or 'b *'.]
LB[re:b][mc:a]
(;B[mc]C['A *' and 'B' make sense, tenuki 'C' can be possible.]
LB[dp:C][qk:B][pf:A]
(;W[pf]C[
* GOOD VARIATION *])

(;W[qk])

(;W[dp];B[qf];W[re];B[pf];W[pe];B[nf];W[mf];B[mg];W[lf];B[ng];W[md];
B[lc];W[ld];B[jc];W[kh])
)

(;B[re];W[qf];B[rf]C['A *' or 'B'.]LB[qh:B][qg:A]
(;W[qg];B[mc]
C[White continues with 'a *'. White playing elsewhere ('b') is
not recommended.]
LB[dp:b][le:a]
(;W[le];B[lc]
C[
* GOOD VARIATION *

Black 15 is necessary to allow for a push at the red dot.]
CR[nc])

(;W[tt]C[White plays elsewhere, not recommended.];B[md];W[me];B[le];
W[lf];B[ke])
)

(;W[qh];B[mc];W[le])
)
)

(;B[nd]
C[
Ko-Nadare = Jakgeun Nunsataehyeong = Xiao~ Xue~beng = Small Avalanche = Kleine Lawine
--------------------------------------------------------------------------------------

Black must have the ladder.
'A *' is correct, 'B' is a trick play.
]
LB[nc:B][qc:A]
(;W[qc];B[rd];W[qb]
C['A' is correct. Black needs the ladder to play 'B'.]LB[pf:B][re:A]
(;B[re]
C[White continues with 'a *' to resolve the situation, or 'b' to
provoke a tough fight. White must have the ladder to play 'b'.
'c' is a game-over mistake.]
LB[nc:c][qf:b][pf:a]
(;W[pf]
C[Black continues with 'a *' or 'b'.

Black takes the right with 'a', White the top. 

Black takes the corner and center, with White on the right and
top sides with 'b'.

Black takes a large corner with 'c', with White taking the right,
and a group on the run.

Black 'd' is a transposition of a variation of 'c': same result
from a different order of moves.]
LB[pb:d][ne:c][of:b][qf:a]
(;B[qf]C[White continues with 'a *'. White 'b' is a mistake.]
LB[pe:b][nc:a]
(;W[nc];B[pe];W[oe];B[of];W[ne];B[pg]
C[White continues by capturing Black 7 on 'a *'. Playing elsewhere
'b' is not recommended.]
LB[dp:b][md:a]
(;W[md]C[
* GOOD VARIATION *])

(;W[tt]
C[Omitting the capture at the marked location by playing elsewhere
is not recommended.]
CR[md];B[md];W[me];B[mc];W[nb];B[le];W[mf];B[lf];W[mg];B[mb];W[ob])
)

(;W[pe]
C[White 14 is a mistake.

Black continues with 'a'. Black 'b' is a mistake.]
LB[pb:b][mc:a]
(;B[mc]C[White continues with 'a'. White 'b' is a mistake.]
LB[rf:b][qg:a]
(;W[qg];B[rf];W[ph];B[rb]C[Black 19 kills White's corner stones.])

(;W[rf]C[White 16 is a mistake.];B[qg];W[rg];B[pg];W[of];B[rh])
)

(;B[pb]
C[Black 15 is slow, giving White the opportunity to make good outside
shape by sacrificing the two White stones in the corner.]
;W[nc];B[nb];W[mc];B[rb];W[mb];B[rc];W[qg])
)
)

(;B[of]C['A' is correct, 'B' is a game-over mistake.]LB[rf:B][pg:A]
(;W[pg];B[ne];W[pe]C['A' is correct, 'B' is a mistake.]LB[rb:B][pb:A]
(;B[pb]C[White continues with 'a'. White 'b' is a mistake.]PL[2]
LB[rc:b][nc:a]
(;W[nc];B[nb];W[mc];B[rb]
C[White continues with 'a'. White 'b' is not recommended.]
LB[pa:b][mb:a]
(;W[mb];B[oa]C['A' or 'B'.]LB[kd:B][jc:A]
(;W[jc]C['A' or 'B' are ok, 'C' is questionable.]LB[oi:C][mg:B][pi:A]
(;B[pi])

(;B[mg];W[pj];B[hc])

(;B[oi]
C[
'A' punishes. 'B' gives an equal result. 'C' depends on the ladder.
'D' is a mistake.]
LB[qi:D][og:C][oh:B][pi:A]
(;W[pi]C['A' or 'B' don't help.]LB[oh:B][pj:A]
(;B[pj];W[ng];B[og];W[oh];B[nh];W[ph];B[mg];W[ni];B[mh];W[oj])

(;B[oh];W[pj]C[Later, Black can use the White weakness on 'A'.]
LB[ql:A];B[ql];W[oj];B[ph];W[qh];B[qg];W[rg];B[qi];W[rh];B[qj])
)

(;W[oh];B[nh];W[pi];B[ni];W[pk])

(;W[og];B[ng];W[nh];B[oh];W[mg];B[nf];W[mf];B[me];W[le]
C[White 34 is unreasonable.];B[mh];W[ni];B[lf];W[lg];B[lh];W[kg];B[nj]
C[Black has the ladder, so this is a loss for White.])

(;W[qi]AB[dc][ce]AW[oq][cp]
C[White 26 is a mistake.

White 26 was played by Rin Kaiho against Takagawa Shukaku in
the 1968 Meijin Title, game 5.

Rin's later comment on this move: " I just don't know joseki....".]
;B[nh];W[qk];B[hc];W[je];B[rf];W[mf];B[og];W[ph];B[ld];W[ee];B[he];
W[kf];B[le];W[ic];B[hd];W[ki];B[mi];W[qp];B[eg];W[ec];B[dd];W[fb];
B[gb];W[ib];B[ed];W[nl];B[kj];W[ji];B[lj];W[eq];B[jj];W[if];B[nn];
W[ll];B[ln];W[jl];B[jn];W[ij];B[ik];W[jk];B[ol];W[ok];B[nk];W[nj];
B[pk];W[mk];B[pj];W[ql];B[pl];W[hk];B[qm];W[rh];B[qo];W[pp];B[po];
W[il];B[mq];W[oh];B[ni];W[ng];B[mg];W[nf];B[lf];W[oe];B[lg];W[ck];
B[iq];W[ch];B[gq];W[fq];B[go];W[gr];B[hr];W[gp];B[hp];W[hq];B[nr];
W[or];B[gq];W[fd];B[fe];W[hq];B[bp];W[co];B[gq];W[db];B[gd];W[hq];
B[rp];W[rq];B[gq];W[oo];B[on];W[hq];B[bo];W[bq];B[gq];W[bc];B[fc];
W[hq];B[ii];W[hi];B[gq];W[eb];B[fp];W[cm];B[cb];W[cc];B[bb];W[ba];
B[ca];W[ab];B[aa];W[ac];B[fa];W[ba];B[dn];W[cn];B[aa];W[gg];B[ea];
W[bf];B[be];W[bg];B[af];W[eh];B[gl];W[fk];B[rn];W[sp];B[so];W[ro];
B[km];W[lk];B[rp];W[sq];B[kg];W[jg];B[lc];W[kb];B[rl];W[rk];B[sk];
W[rg];B[dg];W[dh];B[fr];W[er];B[gs];W[fn];B[cr];W[dr];B[es];W[ds];
B[cq];W[br];B[dp];W[ep];B[eo];W[fs];B[qr];W[ro];B[es];W[cs];B[rp];
W[qq];B[em];W[hm];B[gm];W[do];B[gn];W[el];B[fg];W[fh];B[hg];W[hf];
B[gf];W[gh];B[nq];W[ro];B[sn];W[en];B[gk];W[gj];B[fl];W[dl];B[fo];
W[dm];B[no];W[op];B[sj];W[rj];B[lb];W[la];B[na];W[si];B[sl];W[ma];
B[fm];W[fs];B[gr];W[mm];B[pr];W[os];B[rr];W[rs];B[sr];W[ps];B[sf];
W[hn];B[ho];W[in];B[io];W[mn];B[mo];W[nm];B[ns];W[qs];B[np];W[ss];
B[ke];W[jf];B[kh];W[jh];B[li];W[ag];B[ae];W[om];B[pm];W[ha];B[dn];
W[en];B[cg];W[ba];B[da];W[cf];B[df];W[bh];B[hb];W[ia];B[qf];W[qg];
B[rp];W[pq];B[sg];W[es];B[ro]C[Black (Takagawa) wins by 1 point.])
)
)

(;W[kd];B[mg])
)

(;W[pa]C[White 22 is not recommended.];B[ob];W[mb];B[rc];W[jc]
C[White lost a large ko threat at the marked location by playing 
White 22. White is better off without playing 22.]
LB[pa:22]CR[rf])
)

(;W[rc]
C[White 18 is a mistake, most notably played by Fujsawa Hosai against
Wu Qingyuan = Go Seigen in 1951 in game 2 of the Special Four-Game Match.

While White 18 may be a mistake, the moves to take advantage
of it are non-obvious.]
;B[rf];W[nc]
C[Black continues with 'a', the vital point.
Black 'b' is a mistake.]
LB[nb:b][pa:a]
(;B[pa]C[A tesuji.];W[oa]C[A tesuji.];B[nb];W[mc];B[mb];W[lc];B[lb];
W[kc];B[ra]C[Black captures the corner.];W[pi];B[le])

(;B[nb];W[mc];B[mb];W[pa];B[ob];W[rg];B[sb];W[sc];B[sd];W[ra]
C[A ko is unavoidable.])
)
)

(;B[rb];W[nc];B[nb];W[rc])
)

(;W[rf];B[oe];W[pe];B[pg];W[qf];B[qg])
)

(;B[ne]
C[This move is not recommended.
'A' and 'B' are ok, 'C' returns to joseki. 'D' is a game-over
mistake.]
LB[rf:D][pg:C][nc:B][of:A]
(;W[of]C['A' is correct, 'B' is a mistake.]LB[rb:B][pb:A]
(;B[pb];W[nc]C['A' is ok, 'B' is questionable.]LB[pa:B][nb:A]
(;B[nb];W[mc]C['A' or 'B'.]LB[mb:B][rb:A]
(;B[rb];W[mb];B[oa]
C[White continues with 'a' or 'b'.

Unlike the other variation of Black 19 onto 20, a White play 
at the circled spot is not sente.]
LB[mb:20][rb:19][le:b][nf:a]CR[rf]
(;W[nf]C['A', 'B' or 'C'.]LB[mf:C][ld:B][le:A]
(;B[le];W[ld];B[mf];W[mg];B[ke];W[jc])

(;B[ld];W[kc])

(;B[mf];W[mg];B[le];W[ld];B[ke];W[jc])
)

(;W[le];B[mf])
)

(;B[mb];W[lc];B[lb];W[kc];B[nf];W[rf];B[rb];W[ng];B[lf];W[oh])
)

(;B[pa]C['A' is ok. 'B' is only ok, if White is strong on the top.]
LB[oa:B][mc:A]
(;W[mc];B[rb];W[nf]C['A' or 'B' run in bad shape, 'C' is worse.]
LB[ld:C][mf:B][le:A]
(;B[le];W[ld];B[mf];W[mg];B[ke];W[jc])

(;B[mf];W[mg];B[le];W[ld];B[ke];W[jc])

(;B[ld];W[md];B[me];W[le])
)

(;W[oa];B[nb];W[mc];B[mb];W[lc];B[lb];W[kc];B[nf];W[rf];B[rb];W[ng];
B[lf];W[oh])
)
)

(;B[rb]C[Mistake.];W[nc];B[nb];W[rc]
C[
Punishment
'A', 'B', 'C' or 'D' don't help.]
LB[pb:D][rf:C][qg:B][sc:A]
(;B[sc];W[ob];B[mc];W[pb]
(;B[nc];W[rf])

(;B[qg];W[nc])
)

(;B[qg];W[mc];B[pb];W[pa];B[ob];W[sd]C['A' or 'B' don't help.]
LB[se:B][rf:A]
(;B[rf];W[mb])

(;B[se];W[sb];B[ra];W[sc];B[oa];W[rf])
)

(;B[rf];W[mc];B[pb];W[pa];B[ob];W[sb];B[mb];W[ra]
C['A' or 'B' don't help.]LB[qh:B][lc:A]
(;B[lc];W[qg])

(;B[qh];W[lc])
)

(;B[pb];W[sb];B[ra];W[rf];B[qa];W[sc])
)
)

(;W[pg];B[of]C[Same variation as Black 15 played before Black 13.]
LB[ne:13][of:15])

(;W[nc];B[nb];W[mc];B[pb]C['A' attacks, 'B' returns to joseki.]
LB[pg:B][of:A]
(;W[of]
C[Same position as White 18 and Black 17 played before White 14, 
Black 15, White 16, see there for continuation.]
LB[pb:17][mc:16][nb:15][nc:14][of:18])

(;W[pg];B[of]C[Same variation as Black 19 played before Black 13.]
LB[ne:13][of:19])
)

(;W[rf];B[pe];W[oe];B[of];W[pe];B[pg];W[qf];B[qg])
)

(;B[pb];W[nc];B[nb];W[mc];B[ne];W[of]
C[Same variation as Black 17 and White 18 played before Black 13, 
White 14, Black 15, White 16, see there for continuation.]
LB[pb:13][nb:15][nc:14][mc:16][ne:17][of:18])
)

(;W[qf]
C[White must have the ladder to play this way.

Black continues with 'a', 'b' or 'c'. If White doesn't have the
ladder, 'c' punishes.]
LB[rf:c][pb:b][ne:a]
(;B[ne];W[of];B[pb];W[nc];B[nb];W[mc];B[rb]C['A' or 'B'.]
LB[rf:B][mb:A]
(;W[mb];B[oa]C[White continues with 'a' or 'b'.]LB[jc:b][nf:a]
(;W[nf];B[ld];W[kc])

(;W[jc])
)

(;W[rf];B[qa];W[nf])
)

(;B[pb];W[nc];B[nb];W[mc];B[ne];W[of];B[rb];W[rf];B[qa];W[nf])

(;B[rf]
C[Black must have the ladder to play this way.
'A' is joseki, 'B' is a mistake.]
LB[qg:B][nc:A]
(;W[nc]C[Black plays 'a'. 'b' is not joseki.]LB[qg:b][oe:a]
(;B[oe];W[pe];B[qg];W[pf]
C['A' starts the ladder if White 12 was wrong. If White has the
ladder, Black 'B'.]
LB[pg:B][of:A]
(;B[of]LB[qf:12])

(;B[pg];W[of];B[og];W[nf];B[ng];W[mf];B[nb];W[mc];B[mb]
C['A' is necessary, 'B' a mistake.]LB[lc:B][ob:A]
(;W[ob];B[lc];W[pb];B[ic];W[ld];B[md];W[oc];B[kc])

(;W[lc];B[pb];W[pa];B[ob];W[rc];B[ra];W[qa];B[sc];W[sb];B[sd];W[lb];
B[oa])
)
)

(;B[qg]
C[White plays 'a' and takes swaps two stones with Black. White
can save his two stones with 'b'.]
LB[oe:b][ob:a]
(;W[ob];B[pe];W[pb];B[pf]C[Black 7 is now meaningless.])

(;W[oe];B[mc];W[nb];B[md];W[nf]
C[White must play 20 to avoid being squeezed.];B[jd])
)
)

(;W[qg];B[mc];W[rc];B[rg];W[qh];B[pb];W[rh];B[sb])
)
)

(;W[nc];B[oe];W[pe];B[pf])
)

(;B[pf]C['A' if Black has the ladder, 'B' if he hasn't.]LB[nc:B][ne:A]
(;W[ne];B[md];W[rf])

(;W[nc];B[pe];W[oe];B[ne])
)
)

(;W[nc]
C[White 8 is an aggresive trick play.

Black continues with 'A'. Black 'B' is a mistake.]
LB[mc:B][qc:A]
(;B[qc]C[White may try 'a' or 'b'.]LB[pf:b][mc:a]
(;W[mc];B[pe];W[oe];B[pf];W[ne];B[ph])

(;W[pf];B[mc])
)

(;B[mc]C[Black 9 is a mistake.];W[qc];B[rd];W[qb];B[re];W[pf]
C[Black continues with 'a' or 'b'.]LB[nb:b][qf:a]
(;B[qf];W[nb];B[pe];W[oe];B[of];W[ne])

(;B[nb];W[rf])
)
)
)

(;B[nc]
C[The large avalanche if White 'a'. White 'b *' or tenuki 'c' to
avoid the complications of the large avalanche.]
LB[dp:c][rd:b][nd:a]
(;W[nd]
C[Black starts the large avalanche with Black 'a'. Black 'b', 'c'
and 'd' avoid the avalanche joseki.]
LB[rd:d][re:c][mc:b][md:a]
(;B[md]
C[
Oo-Nadare = Keun Nunsataehyeong = Da` Xiao~beng = Large Avalanche = Grosse Lawine
----------------------------------------------------------------------------------
]
;W[qc];B[rd];W[qb]
C[Black can continue at 'A' to 'C'.
'C', 'B' and 'A' appeared in succession after the joseki was
invented in the early Showa period (1926-1984).
'A' is an invention of Wu Qingyuan = Go Seigen and still the most oftenly played
move of the four.
'D' is a modern invention and leads to a peaceful variation,
which is good for White.]
LB[pe:D][rb:C][re:B][rc:A]
(;B[rc]
C[Black 13 was invented by Wu Qingyuan = Go Seigen, played first on February
2, 1957 against Takagawa. The move was considered revolutionary.
This innovative move has transformed the large avalanche joseki,
Although the variation of Wu Qingyuan = Go Seigen it isn't up to date anymore
in the new millenium, there are other continuations who are still
considered joseki.

White continues with 'a'. White 'b' is not recommended.]
LB[rb:b][mc:a]
(;W[mc];B[lc]C[White continues with 'a'. White 'b' is a mistake.]
LB[mb:b][rb:a]
(;W[rb]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[mb:b][re:a]
(;B[re];W[mb];B[nb]
C['A' is the traditional, 'B' the modern variation.
In one variation 'B' is just another order of moves of 'A'.]
LB[qf:B][lb:A]
(;W[lb];B[pb]
C['A' is a usual joseki. (For example it was played by Cho Chikun
9P in game 4 of the 43th Judan title match against O Rissei Judan
and by Cho Hun Hyeong 9P against Wang Lei 8P in the 7. Samsung
finals.) 'B' is the joseki too, it leads to a modern continuation
and the old variation of Wu Qingyuan = Go Seigen.]
LB[kc:B][qf:A]
(;W[qf]
C['A' and 'B' are joseki, although 'B' gives an empty triangle.
'C' is just another order of the moves after B.
'D' is possible.
'E'' is possible..]
LB[ne:E][of:D][rf:C][me:B][ld:A]
(;B[ld]C['A' is joseki, 'B' is not recommended.]LB[rf:B][pa:A]
(;W[pa];B[oa];W[rf]C['A' is joseki, 'B' is a risky variation.]
LB[sb:B][kb:A]
(;B[kb];W[sc]
C[White captured the right, Black the top.
Later, A is sente for Black.]
LB[ne:A];B[mf])

(;B[sb];W[kc];B[kd];W[jc];B[jd];W[ic];B[of];W[ne];B[mf];W[nf];B[ng];
W[og];B[oh];W[pg];B[nh];W[qj]
C[White can start an approach ko on A, so the result is risky for
Black.]
LB[ra:A])
)

(;W[rf];B[sb];W[kc];B[kd];W[jc];B[jd];W[ic];B[of]C[Black is better.])
)

(;B[me]C['A' is correct, 'B' is a mistake. 'C'.]LB[pa:C][kc:B][of:A]
(;W[of]C['A' or 'B'.]LB[kc:B][rf:A]
(;B[rf];W[kc];B[qg];W[pg];B[qh]
C['A' is joseki, 'B' is an old variation, which is considered a
mistake today.]
LB[pi:B][mf:A]
(;W[mf]C['A' is correct, 'B' is a mistake.]LB[ke:C][lf:B][le:A]
(;B[le]C['A' is usual, 'B' is also possible.]LB[jd:B][hc:A]
(;W[hc]
C['A' is correct.
'B'
'C' is a mistake.
'D', 'E' have been played by professionals.]
LB[je:E][kd:D][mg:C][id:B][lf:A]
(;B[lf];W[mg];B[lg]C['A' or 'B' or 'C'.]LB[ph:C][mi:B][mh:A]
(;W[mh];B[lh];W[ph];B[qi];W[mj];B[mi];W[ni];B[li];W[nj])

(;W[mi]C['A' or 'B'.]LB[mh:B][lh:A]
(;B[lh];W[ph];B[qi])

(;B[mh];W[nh];B[lh];W[ph];B[qj])
)

(;W[ph]C['A' is correct, 'B' is disadvantageous.]LB[mh:B][qi:A]
(;B[qi];W[mi];B[mh];W[nh];B[lh])

(;B[mh];W[nh];B[mi];W[qi];B[ri];W[rj])
)
)

(;B[id]
C['A', 'B' and 'C' are joseki, but with 'A' White must be careful
about ko fighting, 'D' is a mistake, loses points.]
LB[ic:D][jc:C][lf:B][oa:A]
(;W[oa];B[pa]C['A' or 'B'.]LB[ic:B][na:A]
(;W[na];B[ra]
C[The next White move is unnecessary according to some professionals.]
;W[sb]C[Game continuation between O Rissei and Cho Chikun,];B[sc];
W[ma];B[qa];W[ic];B[kd];W[jc];B[kg];W[ph];B[pi]
C['A' is good, 'B' helps Black.]LB[oi:B][mg:A]
(;W[mg];B[oi];W[mi]C[Aji for White on A.]LB[qi:A])

(;W[oi];B[pj];W[oj];B[pk]C['A' is correct, 'B' is a mistake.]
LB[dp:B][mg:A]
(;W[mg])

(;W[dp];B[nh];W[oh];B[nf])
)
)

(;W[ic];B[kd];W[ld];B[ne];W[oe];B[lc];W[na];B[ra];W[ld]
C['A' is correct, 'B' is a mistake.]LB[mg:B][lf:A]
(;B[lf];W[mg];B[lg];W[ph];B[lc];W[jc];B[qi];W[mi];B[mh];W[nh];B[lh];
W[ni])

(;B[mg];W[nf];B[lf];W[lg];B[kg];W[lh];B[lc];W[ma];B[sb];W[kh];B[jc];
W[ld];B[kb];W[lc]C[Neither 'A' nor 'B' help Black.]LB[je:B][jb:A]
(;B[jb];W[ke])

(;B[je];W[jb])
)
)
)

(;W[lf]C['A' is correct, 'B' is a mistake.]LB[kf:B][ke:A]
(;B[ke];W[kf]LB[jf:B][je:A]
(;B[je];W[ic];B[jf];W[jg];B[ig];W[jh];B[ih];W[ji];B[ii];W[jj];B[hk])

(;B[jf];W[jg]C['A' is correct, 'B' and 'C' are slow.]
LB[je:C][if:B][jb:A]
(;B[jb]C['A' is correct, 'B' is disadvantageous.]LB[oa:B][je:A]
(;W[je];B[jd];W[if];B[kb])

(;W[oa];B[pa];W[na];B[ra];W[ma];B[sb]C['A' or 'B'.]LB[je:B][jc:A]
(;W[jc];B[ic];W[ib];B[ig]LB[gb:B][je:A]
(;W[je];B[jd];W[if];B[kb];W[ld];B[kd];W[lc];B[hb])

(;W[gb];B[jh];W[je];B[kg];W[jd];B[ne];W[oe];B[nf])
)

(;W[je];B[jd];W[if];B[kb])
)
)

(;B[if];W[ic];B[ig];W[jh];B[ih];W[ji];B[hj])

(;B[je];W[ic];B[ig];W[jh];B[ih];W[ji];B[ii];W[jj];B[hk])
)
)

(;B[kf];W[ke];B[kd];W[je];B[jd];W[ld];B[ne];W[oe];B[lc];W[pa];B[oa];
W[ld])
)

(;W[jc];B[lf];W[mg];B[lg];W[mi];B[lh];W[ph];B[qi])

(;W[ic]LB[kd:B][mg:A]
(;B[mg]LB[oa:C][lf:B][nf:A]
(;W[nf];B[lf])

(;W[lf];B[ne];W[oe];B[nf];W[ng];B[nh];W[og];B[ke]
C[One White group will die.])

(;W[oa]C['A' or 'B'.]LB[pa:B][nf:A]
(;B[nf];W[na];B[oe];W[pa];B[ne])

(;B[pa];W[na];B[ra];W[ma];B[sb];W[lf];B[ne]
C['A' is correct, 'B' is a mistake.]LB[oe:B][nf:A]
(;W[nf];B[oe];W[kf])

(;W[oe];B[nf];W[ng];B[nh];W[og];B[ke])
)
)
)

(;B[kd]LB[jc:B][ld:A]
(;W[ld];B[mg];W[lf];B[lc];W[ne];B[ke];W[jc];B[jg])

(;W[jc];B[mg]
C['A' leads to a fight, 'B' to a peaceful result, but in both cases,
Black is happy.]
LB[oa:B][nf:A]
(;W[nf];B[lf];W[pi]C['A' is correct, 'B' is a mistake.]LB[ph:B][kh:A]
(;B[kh];W[ph])

(;B[ph];W[oh];B[oi];W[nh];B[oj];W[lh])
)

(;W[oa];B[pa];W[na];B[ra];W[ma];B[sb];W[lf];B[ne]C['A' or 'B'.]
LB[oe:B][nf:A]
(;W[nf];B[oe])

(;W[oe];B[nf];W[ng];B[nh];W[og])
)
)
)
)
)

(;B[mg];W[oa];B[pa];W[na];B[ra];W[ma];B[sb];W[lf];B[ne];W[nf];B[oe];
W[ke])

(;B[kd];W[oa];B[pa];W[na];B[ra];W[jc];B[lg];W[sb];B[sc];W[ma];B[qa];
W[nf];B[lf];W[pi];B[nh];W[oj];B[nj];W[ok];B[nk];W[ol];B[mm];W[on];
B[rj])

(;B[je];W[oa];B[pa];W[mg];B[ne];W[oe];B[kg];W[na];B[ra];W[ph];B[pi];
W[oi];B[pj];W[oj];B[pk];W[kd];B[ke])
)

(;W[jd];B[lf];W[mg];B[lg];W[mi];B[lh];W[ph])
)

(;B[lf]LB[oa:B][mg:A]
(;W[mg]LB[ne:B][ke:A]
(;B[ke];W[hc];B[lg];W[ld];B[le];W[mi];B[lh];W[ph];B[qi])

(;B[ne];W[oe];B[ke];W[hc];B[lg];W[ld];B[le];W[mi];B[mh];W[nh];B[lh];
W[nj];B[kj];W[ph];B[qj])
)

(;W[oa]C[Neither 'A' nor 'B' help.]LB[nf:B][pa:A]
(;B[pa];W[na];B[ra];W[ma];B[sb];W[le];B[ld];W[ke];B[nf];W[mg]
C['A' or 'B'.]LB[ne:B][oe:A]
(;B[oe];W[ng];B[ne];W[kd];B[pe];W[kg]
C[White will first play an extension if this is sente.])

(;B[ne];W[ng];B[oe];W[kd];B[pe])
)

(;B[nf];W[na];B[oe];W[pa];B[pe];W[ob];B[pf])
)
)

(;B[ke];W[hc]C['A' is correct, 'B' is a mistake.]LB[mg:B][lf:A]
(;B[lf];W[mg]LB[kh:B][lg:A]
(;B[lg];W[ld];B[le]LB[ph:B][mi:A]
(;W[mi]LB[li:B][lh:A]
(;B[lh];W[ph];B[qi])

(;B[li];W[lj];B[lh];W[mj];B[ne];W[oe];B[oh];W[oi];B[ph];W[og];B[kj];
W[kk];B[jj];W[jk];B[ij])
)

(;W[ph];B[qi];W[mi];B[mh];W[nh];B[lh])
)

(;B[kh];W[mi])
)

(;B[mg];W[lf];B[ne];W[oe];B[nf];W[ng];B[nh];W[og];B[kd];W[mh];B[jc];
W[ld];B[le];W[jb];B[lc];W[kb];B[lg];W[kf];B[jf];W[kg];B[lh];W[jg];
B[ie];W[if];B[hf];W[je];B[jd];W[he];B[jf];W[li];B[hd];W[kh])
)
)

(;W[pi];B[ph];W[oh];B[oi];W[nh]C['A' or 'B'.]LB[oj:B][nf:A]
(;B[nf]C[A threat to capture three White stones on 'A'.]LB[oe:A])

(;B[oj];W[mi];B[nf];W[oe];B[ke];W[hc]C['A' or 'B'.]LB[he:B][jh:A]
(;B[jh])

(;B[he])
)
)
)

(;B[kc]C['A' or 'B'.]LB[kb:B][sb:A]
(;W[sb]C['A' or 'B'.]LB[kb:B][rf:A]
(;B[rf];W[rg];B[qg];W[rh]C['A' depends on a ladder, 'B' doesn't.]
LB[qi:B][qh:A]
(;B[qh];W[qi];B[pi];W[qj];B[ng];W[ph];B[pg];W[og];B[oh];W[pf];B[ph];
W[nf];B[mf];W[nh]C['A' depends on the ladder, else 'B'..]
LB[ne:B][mg:A]
(;B[mg];W[pj])

(;B[ne]C['A' is correct, 'B' is a mistake.]LB[mg:B][pj:A]
(;W[pj];B[oe];W[oi];B[pe])

(;W[mg];B[oe])
)
)

(;B[qi];W[oh];B[pg];W[og]C['A' or 'B'.]LB[ri:B][oi:A]
(;B[oi];W[ri];B[rj];W[mg];B[qk];W[sc];B[qo]
C[This move depends on the lower right corner. If approaching it
isn't possible, the variation doesn't work well for Black.]
;W[kb];B[jb];W[jc];B[jd];W[ic];B[ib];W[hb];B[hc];W[id];B[gb];W[hd];
B[gc];W[ja];B[ha];W[ld];B[kd];W[le];B[lf];W[ke];B[je];W[kf];B[jf];
W[kg];B[jg])

(;B[ri];W[qh];B[sh];W[ph];B[sg];W[sf];B[se];W[sc];B[si];W[ql];B[pk];
W[ok];B[pl];W[qj];B[pj];W[sd];B[qm];W[sf])
)
)

(;B[kb];W[qh])
)

(;W[kb]C['A' or 'B'.]LB[jb:B][jc:A]
(;B[jc];W[sb];B[jb])

(;B[jb];W[jc];B[jd];W[ic];B[ib];W[hb];B[hc];W[id];B[gb];W[hd];B[gc];
W[ja];B[ha]C['A' gives White more influence than 'B'.]LB[oa:B][ld:A]
(;W[ld];B[kd];W[le];B[lf];W[ke];B[je];W[kf];B[jf];W[kg];B[mg];W[jg];
B[if];W[ig];B[hf];W[oa];B[na];W[mh];B[ng];W[oh];B[pe];W[nf];B[mf];
W[og];B[lh];W[nh];B[lg];W[li];B[kh];W[hg];B[ma];W[ki];B[jh];W[ii];
B[ji];W[jj];B[ka];W[ij])

(;W[oa];B[na];W[lf];B[ld];W[mf];B[je];W[pa];B[ma];W[rf])
)
)
)
)

(;W[kc];B[pe];W[oe];B[pf];W[of];B[pg]LB[sc:B][og:A]
(;W[og];B[qg])

(;W[sc];B[qg];W[oa];B[og];W[nf];B[mg];W[na];B[ng];W[pa])
)

(;W[pa];B[oa];W[rf];B[sb];W[kc])
)

(;B[rf];W[kc];B[me];W[of];B[qg]C[Just another order of moves.])

(;B[of]C['A', 'B' are correct, 'C' is disadavantageous.]
LB[kc:C][pa:B][ne:A]
(;W[ne]C['A' is correct, 'B' is disadvantageous.]LB[rf:B][ld:A]
(;B[ld]C['A' is correct. 'B' is disadvantageous.]LB[kc:B][pa:A]
(;W[pa];B[oa];W[rf]C['A' or 'B'.]LB[kb:B][sb:A]
(;B[sb];W[kc];B[kd];W[jc];B[mf];W[nf];B[ng]C['A' or 'B'.]
LB[me:B][og:A]
(;W[og];B[me];W[pf];B[oh];W[pg];B[nh];W[qi]
C[Black can continue on A or B.]LB[hd:B][hc:A])

(;W[me];B[lf];W[og];B[le];W[nh];B[mg];W[pf];B[oh];W[pg];B[hc];W[ni];
B[hd];W[sc];B[sd];W[ra];B[qa];W[jd];B[ie];W[pa];B[je])
)

(;B[kb];W[sc]
C[Later, White has a continuation on A, aiming for an extension
around B.]
LB[pj:B][nf:A])
)

(;W[kc];B[rf];W[nf];B[ke];W[kd];B[le]C['A' is correct, 'B' is slack.]
LB[id:B][qg:A]
(;W[qg]C['A' or 'B'.]LB[ic:B][id:A]
(;B[id];W[jb];B[ib];W[oa];B[pa];W[ic];B[hc];W[hb];B[jc];W[jd];B[je];
W[ic];B[ng];W[ia];B[og])

(;B[ic];W[id];B[jd];W[jc];B[je];W[ib];B[hc];W[hb];B[gc];W[gb];B[fc];
W[fb];B[ec];W[rg];B[sb])
)

(;W[id];B[qg];W[je])
)
)

(;B[rf];W[kc];B[ld];W[kd];B[le];W[qg];B[ke];W[id];B[je];W[hc]
C['A' is correct, 'B' is disadvantageous.]LB[rg:B][nf:A]
(;B[nf];W[pe]C['A' or 'B'.]LB[pj:B][rg:A]
(;B[rg];W[qh];B[oj];W[qj];B[ol])

(;B[pj];W[oh];B[ni];W[nh];B[mh];W[mg];B[mi];W[mf];B[kh];W[oi];B[oj];
W[sb];B[qa];W[rg];B[ra];W[qi];B[qj];W[ri])
)

(;B[rg];W[nf];B[qh];W[nh])
)
)

(;W[pa];B[oa];W[rf];B[sb]C['A' is correct, 'B' is a mistake.]
LB[ne:B][kc:A]
(;W[kc];B[me];W[pe];B[ke];W[hc])

(;W[ne]C['A' is correct, 'B' is a mistake.]LB[ld:B][kc:A]
(;B[kc];W[nf];B[le])

(;B[ld];W[kc];B[kd];W[jc];B[mf];W[nf];B[ng];W[me];B[lf];W[og];B[le];
W[nh];B[mg];W[pf];B[oh];W[pg];B[oi])
)
)

(;W[kc]C['A' is correct, 'B' is questionable.]LB[ld:B][me:A]
(;B[me]C['A' is correct, 'B' is disadvantageous.]LB[pa:B][pe:A]
(;W[pe]C['A' or 'B'.]LB[sb:B][rf:A]
(;B[rf];W[qg];B[rg];W[qh];B[ke];W[hc];B[mh];W[pk]C[good for White])

(;B[sb];W[ph])
)

(;W[pa];B[oa];W[pe]C['A' or 'B'.]LB[ra:B][rf:A]
(;B[rf];W[qg];B[sb];W[pi];B[je];W[hc])

(;B[ra];W[rf];B[sb];W[pi])
)
)

(;B[ld]C['A' is correct, 'B' is a mistake.]LB[kd:B][pa:A]
(;W[pa];B[oa];W[rf];B[sb]C['A' is correct, 'B' is disadavantageous.]
LB[ne:B][pe:A]
(;W[pe];B[mf];W[kd];B[ke];W[je];B[kf];W[id];B[pi];W[ra];B[qa];W[ng];
B[nf])

(;W[ne];B[kd];W[jc];B[jd];W[ic];B[id];W[hd];B[he];W[gd];B[nf];W[me];
B[lf];W[mf];B[mg];W[pe];B[kg];W[lh];B[lg];W[qi])
)

(;W[kd];B[mf];W[pe];B[rf];W[qg];B[ke];W[je];B[kf];W[id];B[pj];W[ng];
B[ni];W[nh];B[mi];W[lg];B[mg];W[mh];B[lh];W[nf];B[ne];W[oe]
C[Black lost the game.])
)
)
)

(;B[ne]C['A' is correct.
'B' and 'C' are mistakes.]
LB[me:C][of:B][pe:A]
(;W[pe]LB[ld:B][rf:A];B[rf]C['A' or 'B'.]LB[ld:B][kc:A]
(;W[kc];B[ld];W[kd];B[qg];W[pg];B[ke];W[qh];B[rg]
C['A' is correct, 'B' is disadavantageous.]LB[je:B][oa:A]
(;W[oa];B[pa];W[na];B[ra];W[ma]
C['A' is correct, 'B' is a desperate attempt, to keep control on
the center.]
LB[kb:B][sb:A]
(;B[sb];W[je];B[lf];W[jf];B[lh];W[oi]C[End of joseki.];B[jd]
C[This cut is not possible.];W[id];B[jc];W[kb];B[ic];W[hc];B[hd];W[ie]
;B[hb];W[gc];B[ib];W[gb])

(;B[kb];W[jb];B[lf];W[ka];B[sb];W[oi];B[li];W[pm])
)

(;W[je];B[lf]LB[id:B][jf:A]
(;W[jf];B[lh];W[oi];B[jd];W[jc];B[id];W[ic];B[hd];W[hc];B[gd];W[fc];
B[fd];W[ec])

(;W[id];B[ph];W[og];B[pi];W[nh];B[jf];W[if];B[jg];W[nj];B[pk])
)
)

(;W[ld];B[me];W[kc];B[qg];W[pg];B[qh];W[ph];B[pi];W[nh];B[oi];W[ng])
)

(;W[of];B[rf]LB[kc:B][oe:A]
(;W[oe];B[kc];W[ld];B[me];W[lf];B[kb];W[le];B[qg])

(;W[kc];B[oe];W[pe];B[qg];W[pf];B[me])
)

(;W[me];B[ld];W[nf];B[le];W[mf]LB[rf:B][kb:A]
(;B[kb];W[pa];B[oa];W[rf];B[lf];W[sc]LB[lg:B][mg:A]
(;B[mg];W[of]C[Black's influence is superior.])

(;B[lg])
)

(;B[rf];W[qg]C['A' or 'B'.]LB[kb:B][lf:A]
(;B[lf];W[kc];B[lg]
C[Now, White can remove only one weakness 'A' or 'B'.]LB[ic:B][oe:A]
(;W[oe];B[ic])

(;W[ic];B[of];W[pe];B[ng])
)

(;B[lf];W[kc];B[lg]C[Black is better, because he continue on A or B.]
LB[ic:B][of:A])

(;B[kb];W[lf])
)
)
)
)

(;W[kc]
C[Black continues with 'a'. Black 'b' is heavy and reduces Black's
liberties.]
LB[ld:b][me:a]
(;B[me];W[of];B[qf];W[nf]
C[Black continues with 'A'. Black 'B' is the continuation of Go
Seigen, but too slow for professional players nowadays.]
LB[ke:B][mf:A]
(;B[mf]
C[Black 27 is a relatively recent development, first appearing
professionally in 1968. 

White 'a' to 'c' are possible continuations.]
LB[oa:c][nh:b][mg:a]
(;W[mg];B[lg];W[mh];B[lh];W[mi];B[li];W[mj];B[ic]
C[If Black has support in the top-left corner, which is usually
the case in Black choosing this joseki, Black 35 serves as both
a check and an extension from the top-left corner.]
;W[ke];B[kf]C[A is now a good point for White.]LB[qh:A])

(;W[nh]
C[This variation shows the sequence when Black 27 was first played
professionally; Black responds with 28.]
;B[mh];W[ni];B[mi];W[nj];B[ic];W[ke];B[ie];W[kg];B[ki])

(;W[oa]
C[White 28 initiates an exchange whereby White gains influence,
Black profit.]
;B[pa];W[na];B[ra]C[White continues with 'a', 'b' or 'c'.]
LB[sb:c][mg:b][ma:a]
(;W[ma];B[sb];W[mg];B[lg];W[lh];B[ng];W[mh];B[ne];W[lf];B[oe];W[kg])

(;W[mg];B[lg];W[lh];B[mh];W[ng];B[kh]
C[White continues with 'a'. White 'b' is not recommended.]
LB[lf:b][li:a]
(;W[li];B[kf]
(;W[mi];B[ic])

(;W[hc]C[White cannot afford to play 40 here.];B[mi]
C[Black 41 initiates a sequence where White's position on the top-right
falls apart.])
)

(;W[lf]
C[White 38 gives Black a ponnuki in the center of the board. Normally
this would be to Black's advantage.]
;B[li];W[kf])
)

(;W[sb];B[sc];W[ma];B[qa];W[mg];B[lg];W[lh]LB[mh:B][ng:A]
(;B[ng];W[mh];B[ne];W[kg];B[oe];W[lf])

(;B[mh];W[ng];B[kh]C['A' is correct, 'B' is disadvantageous.]
LB[lf:B][li:A]
(;W[li];B[kf];W[mi];B[ic];W[jd];B[id];W[je];B[ki])

(;W[lf];B[li];W[kg];B[lh];W[le])
)
)
)
)

(;B[ke]
C[Black 27 is considered a thank-you move, what is one reason,
that this variation is avoided nowadays.

White continues with 'a'. Contesting the corner with 'b' is futile.
White 'c' attempts to win by ko. White 'd' is another attempt
at mischief.
'e' and 'f' are special strategies.]
LB[id:f][lg:e][ke:27][sc:d][pa:c][oa:b][hc:a]
(;W[hc]C[Black continues with 'a'. Black 'b' is possible.]
LB[ph:b][lg:a]
(;B[lg]
C[Black 29 is also too slow and a reason against this variation.

White continues with 'a'. 
White 'b' is a strong move with potential for trouble (for both
players); White does not necessarily come out well.
White 'c' is a mistake.]
LB[ni:c][pi:b][lg:29][oi:a]
(;W[oi];B[qi]LB[ok:B][mi:A]
(;W[mi];B[ki])

(;W[ok])
)

(;W[pi]
C[White aims for the marked location, but Black can fight back.
Both players must proceed with care.

Black 'a' preceeded the development of 'b'. Black 'b' is more
common now.]
LB[nh:b][oh:a]CR[rg]
(;B[oh]
C[Black attacks to sever the link.

White continues with 'a'. White 'b' is less favorable. White
'c' has been played professionally.]
LB[ph:c][sc:b][qg:a]
(;W[qg];B[pg]C[White continues with 'a'. White 'b' is a mistake.]
LB[pf:b][sc:a]
(;W[sc];B[qa];W[pf];B[pe];W[rf];B[qe];W[rg];B[ra];W[ni]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[ph:b][oi:a]
(;B[oi];W[oj];B[nh];W[ph];B[nj];W[og];B[ok];W[pj];B[mi];W[nk])

(;B[ph]
C[Black 43 is not recommended, as it gives White favorable thickness.]
;W[nh];B[qh];W[qi];B[rh];W[ri])
)

(;W[pf]C[White 34 is a mistake.];B[pe];W[sc];B[og]
C[Black can capture the six White stones.])
)

(;W[sc];B[qa];W[ph]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[pg:b][rg:a]
(;B[rg];W[pg]
C[White 36 is necessary. The exchange of White 32, Black 33 favors
Black.])

(;B[pg];W[og];B[nh];W[qg];B[pf];W[rf];B[pe];W[oe];B[qe];W[se])
)

(;W[ph]C[White 32 is in hopes of Black 'b'. Black 'a' is fierce.]
LB[pg:b][og:a]
(;B[og]C[Black 33 a strong move.];W[oa];B[pa];W[na];B[ra];W[pg];B[pf];
W[ma];B[sb];W[mf];B[lf];W[ld];B[le];W[ni];B[ne]
C[White continues with 'a'. White 'b' is a mistake.]LB[oi:b][nh:a]
(;W[nh];B[oe]C[White next plays elsewhere.])

(;W[oi];B[mg];W[ng];B[oe];W[nh])
)

(;B[pg];W[sc]
C[Now White has advantage in taking the five Black stones at top.])
)
)

(;B[nh]
C[Black 31 builds thickness while lightly attacking the weak connection
of White's large knight's move.]
;W[oh];B[ni];W[rg]
C['A' and 'B' keep the corner.
If omitted, Black will also keep the corner, but White will strenghen
himself much on the right by attacking the Black stones. Therefore,
Black must choose a big tenuki 'C' in precompensation, but not
the local pseudo-attack 'D', which is a mistake.]
LB[ok:D][dp:C][qg:B][rf:A]
(;B[rf];W[pk])

(;B[qg];W[qh])

(;B[tt]C[Black plays elsewhere.];W[sc]
C[Illstrated continuation; White is unsuccessful (demonstrating
Black's tenuki is viable).]
;B[qa];W[rf];B[pe];W[se];B[sb];W[sa];B[sf];W[sg];B[pa];W[sd];B[qe]
C[White gets a good result after 'A'. 'B' doesn't capture the Black
stones.]
LB[sb:B][qg:A]
(;W[qg];B[ra];W[pf];B[sb];W[pk])

(;W[sb];B[ra];W[sf];B[qg];W[rh];B[qh];W[ri];B[qi];W[qj];B[rj];W[rk];
B[pj];W[qk];B[oi]C[White loses.];W[ph];B[og])
)

(;B[ok]
C['A' is correct.

'B' comes from game 1 of the 1973 Honinbo Title between Yoshio
Ishida (Black in this figure) and Rin Kaiho. In retrospect, Ishida
did not consider the outcome to his advantage.]
LB[pk:B][sc:A]
(;W[sc]C[Usually, 'A' is better than 'B'.]LB[sd:B][qa:A]
(;B[qa];W[rf];B[pe];W[se];B[sb];W[sa];B[qg];W[qh]C['A' or 'B'.]
LB[sf:B][pa:A]
(;B[pa];W[sd];B[qe];W[ri];B[ra];W[ql])

(;B[sf];W[sg];B[pa];W[sd];B[qe];W[sf];B[ra];W[ri];B[sb];W[ql])
)

(;B[sd];W[oa];B[pa];W[sa]C[Ko.])
)

(;W[pk]C[Black continues with 'a'. Black 'b' is unreasonable.]
LB[ol:b][qg:a]
(;B[qg];W[ol];B[qh];W[ng];B[nk];W[pl]
C[White gains an advantage with 42.])

(;B[ol]
C[Black cannot play 37 here; the position in the corner does not
allow it.]
;W[sc];B[qa];W[rf];B[pe];W[se];B[sb];W[sa];B[sf];W[sg];B[pa];W[sd];
B[qe];W[sf];B[qg];W[rh];B[qh];W[ri];B[qi];W[qj]
C[White 36 is in perfect position to trap Black.])
)
)
)
)

(;W[ni]
C[White 30 reveals White's thinness.

Black takes advantage at 'a'. Playing elsewhere ('b') misses
an opportunity.]
LB[dp:b][ph:a]
(;B[ph]
C[Now Black must play 'a' or 'b', strenghtening Black just to stay
connected.]
LB[mg:b][oh:a]
(;W[oh];B[pi])

(;W[mg];B[lh])
)

(;B[tt];W[pi]C[White 31 fixes White's shape.])
)
)

(;B[ph]C['A' is usual, 'B' can be inferior, 'C' creates a ko.]
LB[qg:C][nh:B][lg:A]
(;W[lg];B[jf];W[nh])

(;W[nh])

(;W[qg];B[pg];W[rf]LB[pf:B][pe:A]
(;B[pe];W[pf];B[qe];W[sc];B[sd];W[sa];B[rg];W[oa];B[pa];W[na]C[Ko.])

(;B[pf];W[sc];B[qa];W[oa];B[pa];W[na];B[ra];W[sb];B[pe];W[se];B[qe];
W[sd];B[rg];W[sg];B[rh]C[Ko. Black ko threats on A and B.]
LB[mf:B][ne:A])
)
)
)

(;W[oa]
C[White 28 does not work because of the exchange of Black 13, White
16.]
;B[pa];W[na];B[ra]
C[Without the exchange of Black 13, White 16, White could play
at the marked location (and win the fight).]
CR[qa])

(;W[pa];B[oa];W[ra];B[ma];W[la];B[sb]
C[Because of the double ko, Black can win. If another ko appears
elsewhere, however, White has an endless supply of ko threats.])

(;W[sc]
C[White 28 is another attempt that should not work, but Black must
be careful. Black continues with 'a'; Black 'b' is a mistake.]
LB[sd:b][qa:a]
(;B[qa]C[White 'a' is sente.]LB[rg:a])

(;B[sd]C[Black 29 is a mistake.];W[oa];B[pa];W[sa];B[qa];W[na])
)

(;W[lg];B[kg];W[kh];B[jg];W[lf];B[kd];W[ld];B[le];W[ic])

(;AW[fc];W[lg];B[kg];W[kh];B[jg];W[lf];B[kd];W[ld];B[le];W[ic];B[id];
W[hd];B[lh];W[nh];B[li];W[ie];B[je];W[rg];B[qg];W[qh];B[ph];W[pg];
B[rh];W[qi];B[ri];W[pi];B[qj];W[pj];B[qk]
C[Later, White can run away with A with external help like a stone
in the bottom left corner.]
LB[ki:A])

(;AW[fc];W[id];B[lg];W[oi];B[qi];W[mi];B[ki];W[lk];B[jk])
)
)

(;B[ld]C[Black 23 is not recommended.];W[qf];B[kd];W[jc];B[of];W[pa]
C[White 28, aiming for a ko later, is nicely timed.];B[oa];W[rf];B[ne]
;W[pe];B[sb];W[qi]C[White can get a ko later with a play at 'a'.]
LB[ra:a])
)
)

(;W[qf]C['A' or 'B'.]LB[rf:B][pb:A]
(;B[pb];W[lb]
C[This is the same variation as if White played 20 and 22 in reversed
order.]
LB[qf:20][lb:22][pb:21])

(;B[rf];W[lb];B[pb];W[kc];B[me];W[of])
)
)

(;B[mb]C[Black 17 is not recommended.];W[re]
C[White 18, capturing the three Black stones, is good enough.])
)

(;W[mb]
C[White 16 is a mistake.

Black continues with 'a'. Black 'b' is a mistake.]
LB[nb:b][pb:a]
(;B[pb]LB[kc:B][rb:A]
(;W[rb];B[sb];W[kc];B[me];W[lb];B[of];W[pf];B[ne];W[pe];B[ph])

(;W[kc];B[me]
C[Now 'a' and 'b' are miai.

See the variation of Black 13 being on the marked position instead 
for continuations.]
LB[rc:13][lb:b][of:a]MA[rb])
)

(;B[nb]C[Black 17 is a mistake.];W[lb];B[pb];W[kc];B[me];W[of])
)
)

(;W[rb]
C[White 14 is not recommended, but was the reply Takagawa made
against Wu Qingyuan = Go Seigen when Go first played Black 13.]
;B[re];W[mc]C['A' is better than 'B'.]LB[me:B][lc:A]
(;B[lc];W[mb];B[nb];W[lb];B[pb];W[oa];B[pa];W[kc];B[me];W[of];B[qf];
W[nf])

(;B[me];W[pf];B[qf];W[pe];B[pg]LB[nf:b][pb:a]
(;W[pb];B[lc];W[mb];B[qg]
C[
There is a similar variation after Black plays 15 instead of 
13.
The only difference between the two variations is the forced 
exchange of Black 13 and White 14; here White has unconditionally 
lost 2 points.]
LB[re:15][rb:14][rc:13])

(;W[nf]
C[White 22, attempting to avoid the 2-point loss from playing White
14, is a mistake. Wu Qingyuan = Go Seigen made this mistake against Fujisawa
Shuko in the 1st Meijin Title League in 1961.]
;B[pb];W[rf];B[qg];W[sc];B[rg];W[mb];B[nb];W[oa];B[mg];W[ng];B[lc]
C[Nice block by Black.];W[lb];B[nh]
C[Black 35 is an excellent squeeze play.

The game continued with 'a'. Variation 'b' demonstrates a different
but fruitless approach.]
LB[oh:b][na:a]
(;W[na];B[ne];W[of];B[mf];W[pa]C[Black gets superior thickness.])

(;W[oh];B[kb];W[kc];B[ld];W[jb];B[ka];W[ja];B[kd];W[jc];B[ne];W[of];
B[og];W[mh];B[ni];W[mf];B[lg];W[lf];B[kf];W[kg];B[lh];W[ke];B[jf]
C[White may try 'a' or 'b'. Neither work.]LB[jd:b][je:a]
(;W[je];B[le])

(;W[jd];B[je]C[White cannot get a snapback.])
)
)
)
)
)

(;B[re]C[White continues with 'a'. White 'b' is a mistake.]
LB[qf:b][mc:a]
(;W[mc];B[me]
C[White continues with 'a' or 'b'. White 'c', 'd' and 'e' are less
favorable.]
LB[of:e][qf:d][pb:c][pe:b][pf:a]
(;W[pf];B[qf];W[pe]C[Black continues with 'a' or 'b'.]LB[mb:b][pg:a]
(;B[pg]C[White continues with 'a' or 'b' .
'c' is disadvantageous.]
LB[qg:c][nf:b][pb:a]
(;W[pb];B[lc]C[White continues with 'a' or 'b'.]LB[qg:b][mb:a]
(;W[mb]
C[Black continues with the quiet 'a', leaving 'b' in reserve (though
'b' is playable).]
LB[of:b][qg:a]
(;B[qg]C[The definitive pattern developed in the mid-1950s.])

(;B[of];W[nb];B[qg])
)

(;W[qg]C['A' is correct, 'B' is disadvantageous.]LB[mb:B][rf:A]
(;B[rf];W[mb];B[qh]LB[lb:B][of:A]
(;W[of])

(;W[lb])
)

(;B[mb];W[rf])
)
)

(;W[nf]
C[White 20 was played by Kuko Norio against Kobayashi Koichi in
the 24th Tengen Title match, 1998-11-05.
'A' is correct, 'B' and 'C' are mistakes.]
LB[pb:C][lc:B][mb:A]
(;B[mb];W[lc];B[lb]
C[White continues with 'a'; White 'b' is less preferable. 'c'.]
LB[pb:c][qg:b][kc:a]
(;W[kc]C['A' and 'B' are correct.
'C' and 'D' are mistakes.]
LB[qg:D][pb:C][kb:B][rc:A]
(;B[rc]C['A' or 'B'.]LB[qg:B][pb:A]
(;W[pb];B[oa]LB[qg:B][rb:A]
(;W[rb];B[ob];W[qg];B[rf]C['A' and 'B' are both joseki.]LB[kb:B][rg:A]
(;W[rg]C['A' is correct, 'B' is a mistake.]LB[qi:B][pa:A]
(;B[pa];W[qi]C['A' is correct, 'B' is not advantageous.]LB[ph:B][ke:A]
(;B[ke]C['A' is correct, 'B' pushes the opponent to much influence.]
LB[id:B][oh:A]
(;W[oh];B[jd])

(;W[id];B[ph];W[mg];B[pi];W[qj];B[pj];W[qk];B[pk];W[pl];B[ol];W[pm];
B[jg];W[mi];B[mk])
)

(;B[ph];W[ke];B[lf];W[nh];B[pi];W[qj];B[pj];W[qk];B[pk];W[pl];B[ol];
W[pm];B[kf];W[mi];B[mk];W[ki];B[if];W[jk])
)

(;B[qi];W[ph];B[og];W[ri]C[Neither 'A' nor 'B' give a good result.]
LB[oh:B][pa:A]
(;B[pa];W[ng];B[oh];W[pi];B[lf];W[mh];B[oi];W[pj];B[oj];W[ok])

(;B[oh];W[sf];B[ne];W[of];B[mg];W[se];B[mf];W[sc];B[kb];W[jc];B[jb];
W[ic];B[if];W[ib])
)
)

(;W[kb];B[pa];W[ke]C['A' is correct, 'B' just creates a heavy group.]
LB[lf:B][ph:A]
(;B[ph];W[mf])

(;B[lf];W[og];B[ph];W[oi];B[pi];W[oj];B[pj];W[ok])
)
)

(;W[qg];B[rf];W[ob];B[nb];W[kb];B[rb];W[ke];B[ph];W[mf])
)

(;W[qg];B[rf];W[pb];B[ob];W[oa];B[nb];W[kb];B[rb];W[ke];B[lf];W[oh];
B[lh];W[ph])
)

(;B[kb]C[White continues with 'a'. 'b' is disadvantageous.]
LB[jc:b][qg:a]
(;W[qg];B[rf]
C['A' is correct, all variations after 'A' favor White, 'B' and
'C' are mistakes.]
LB[qi:C][qh:B][rg:A]
(;W[rg]C['A' is best.
'B' is possible.
'C' and 'D' are mistakes.]
LB[rc:E][pb:D][rb:C][ph:B][qi:A]
(;B[qi]LB[ri:B][ph:A]
(;W[ph];B[og]C['A' is correct, 'B' is a mistake.]LB[qh:B][ri:A]
(;W[ri];B[oh];W[mf];B[pi]
C['A' is better than 'B' is better than 'C'.
'A' provides a ko threat,]
LB[rh:C][sg:B][pb:A]
(;W[pb]LB[rh:B][ob:A]
(;B[ob];W[sg]
C['A' is correct. As White has ko threat thanks to White 36, 'B',
leading to a ko, is disadvantageous.]
LB[pb:36][rh:B][jc:A]
(;B[jc];W[oa];B[nb];W[rh];B[kd];W[mh];B[qk])

(;B[rh];W[qh];B[rj];W[sh];B[sj];W[rc];B[si];W[sd];B[rh];W[oa];B[sf];
W[nb]C[White is better.])
)

(;B[rh];W[nb];B[jc];W[ic];B[kd];W[ob]LB[jd:B][ib:A]
(;B[ib];W[jd];B[jb];W[id];B[hc];W[hd];B[gc])

(;B[jd];W[ib])
)
)

(;W[sg];B[jc];W[rj];B[ke];W[mh]C['A' is correct, 'B' is a mistake.]
LB[mi:B][rc:A]
(;B[rc];W[rb];B[sb];W[sc];B[mi]C[White can play ko.])

(;B[mi];W[lh];B[oj];W[pb];B[ob];W[oa];B[nb];W[qh];B[mj])
)

(;W[rh];B[rc];W[rb];B[sb]LB[pa:C][nb:B][qk:A]
(;W[qk];B[ke];W[nb];B[ob];W[sf];B[ra];W[qa];B[pk];W[pl];B[ok];W[se]
C[White still must occupy A to change the corner from ko to his
life.]
LB[sc:A])

(;W[nb];B[ob];W[sf];B[rj];W[sc];B[ke];W[ic];B[jc])

(;W[pa];B[nb];W[qk];B[ke];W[mh];B[pk];W[ql];B[pb];W[nk];B[nl];W[ml];
B[pl];W[nm];B[pm];W[rn])
)
)

(;W[qh];B[oh];W[pi];B[ne];W[of];B[mg])
)

(;W[ri]LB[rj:C][rc:B][ph:A]
(;B[ph]C['A' is correct, 'B' is wrong.]LB[rh:B][sg:A]
(;W[sg]LB[rj:C][jc:B][rc:A]
(;B[rc];W[rb];B[sb];W[sc]LB[jc:B][sd:A]
(;B[sd];W[sf])

(;B[jc];W[mf];B[kd];W[rh])
)

(;B[jc];W[mf];B[kd];W[rh];B[qk])

(;B[rj];W[rh]LB[ql:B][si:A]
(;B[si];W[rc];B[qh];W[sd])

(;B[ql];W[jc];B[lf];W[nh];B[pb];W[rc];B[pa];W[sd])
)
)

(;W[rh];B[rc];W[rb];B[sb]LB[qk:B][nb:A]
(;W[nb];B[ob];W[sf];B[ra];W[qa];B[mf];W[ng];B[mg];W[nh];B[mh];W[ni];
B[lj]C[Good for Black. Two stage ko in the corner.])

(;W[qk])
)
)

(;B[rc];W[rb]LB[ph:B][sb:A]
(;B[sb];W[qj];B[pb];W[ph];B[ke]C[Good for Black.])

(;B[ph]C['A' is correct, 'B' is wrong.]LB[rh:B][sg:A]
(;W[sg]LB[rh:C][mf:B][rj:A]
(;B[rj];W[rh];B[si];W[sc];B[qh];W[sd])

(;B[mf];W[ng];B[mg];W[nh];B[mh];W[ni];B[jd];W[mi])

(;B[rh];W[qh];B[rj]C['A' is correct, 'B' is wrong.]LB[pi:B][sh:A]
(;W[sh];B[nh];W[mf];B[sj]C['A' is correct, 'B' is wrong.]
LB[sc:B][qj:A]
(;W[qj];B[pi];W[rk];B[qk];W[pj];B[rl];W[pb];B[oa];W[ob];B[nb];W[jc]
LB[sk:B][jb:A]
(;B[jb];W[sc];B[ic];W[le];B[oj])

(;B[sk];W[sc];B[si];W[sd];B[rh];W[jb];B[sf];W[ka])
)

(;W[sc];B[si];W[sd];B[rh])
)

(;W[pi];B[ng];W[nh];B[oi];W[qj];B[mg])
)
)

(;W[rh];B[sb];W[nb];B[ob];W[sf];B[ra];W[qa];B[mf];W[ng];B[mg];W[nh];
B[mh];W[ni];B[lj])
)
)

(;B[rj];W[ph];B[og];W[pi];B[mg];W[ng])
)
)

(;B[ph];W[qi]LB[pi:B][rc:A]
(;B[rc];W[rb];B[sb];W[pa];B[nb];W[sf];B[ra];W[oa];B[pb];W[qa];B[na];
W[sa]LB[sc:B][qh:A]
(;B[qh];W[rh];B[ra])

(;B[sc];W[se];B[ra];W[mf])
)

(;B[pi];W[qj];B[mg];W[ng];B[mh];W[nh];B[ni];W[mf];B[ne];W[of];B[lf];
W[le];B[ld];W[ke];B[kd];W[je];B[jc];W[lg])
)

(;B[rc];W[rb]C['A', 'B' or 'C'.]LB[ph:C][sb:B][qi:A]
(;B[qi];W[ri];B[ph];W[sg]C['A' or 'B'.]LB[rh:B][rj:A]
(;B[rj];W[rh];B[si];W[sc];B[qh];W[sd])

(;B[rh];W[qh];B[rj];W[sh];B[nh];W[mf];B[sj];W[qj];B[pi];W[rk];B[qk];
W[pj];B[rl];W[pb];B[na];W[ob];B[nb];W[jc]
C['A' gives the right, 'B' the top side.]LB[sk:B][jb:A]
(;B[jb];W[sc];B[ic];W[le];B[oj])

(;B[sk];W[sc];B[si];W[sd];B[rh];W[jb];B[sf];W[ka])
)
)

(;B[sb];W[nb];B[ob];W[sc];B[sd];W[sf];B[ra];W[qa];B[pa];W[sa])

(;B[ph];W[qi];B[pi];W[qj];B[mg];W[ng];B[mh];W[nh];B[ni];W[mf];B[ne];
W[of];B[lf];W[le];B[ld];W[ke];B[kd];W[je]C['A' or 'B'.]LB[lg:B][jc:A]
(;B[jc];W[lg];B[kf];W[lh];B[mi];W[jg])

(;B[lg];W[jc])
)
)

(;B[rb];W[nb];B[ob];W[rc];B[sc]LB[ra:B][sb:A]
(;W[sb];B[sa];W[qa];B[pa];W[sf];B[na];W[sd];B[pb];W[se])

(;W[ra];B[sb];W[sf])
)

(;B[pb];W[nb];B[na];W[rc])

(;B[rc];W[rb];B[sb];W[nb];B[ob];W[sc];B[sd];W[sf];B[ra];W[qa];B[pa];
W[sa])
)

(;W[qh];B[rc]
C['A' and 'B' are correct, 'C' and 'D' are disadvantageous.]
LB[oh:D][nh:C][rb:B][pb:A]
(;W[pb];B[oa];W[rb];B[ob];W[sb];B[pa])

(;W[rb];B[pb];W[oh];B[jd];W[jc];B[ic];W[kd];B[ke]
C[White cannot escape on 'A' nor 'B'.]LB[je:B][id:A]
(;W[id];B[je];W[ib];B[hc];W[jb];B[hb])

(;W[je];B[id];W[le];B[kf];W[mf];B[jb])
)

(;W[nh];B[jd])

(;W[oh])
)

(;W[qi];B[og];W[rg];B[mg]LB[ng:B][mf:A]
(;W[mf];B[ne];W[of];B[lf])

(;W[ng];B[of];W[ne];B[nh])
)
)

(;W[jc]C['A', 'B' or 'C'.]LB[qg:C][rg:B][mf:A]
(;B[mf];W[ng];B[qg]
C[Owing to the White corner stones, White 'a' and 'b' are sente.]
LB[id:b][jb:a];W[pb];B[ob];W[oa];B[nb];W[ni];B[kf];W[id]
C[Black continues with 'a'. Black 'b' lets White cause trouble
in the corner.]
LB[if:b][rb:a]
(;B[rb]C[Black 8 in the corner is necessary.];W[if];B[mh];W[nh];B[jh]
C[Black's center stones should be okay.])

(;B[if]
C[Black 37 is a mistake. Black needed to tend to the corner first.];
W[rc];B[pa];W[ra];B[sb];W[sc];B[jb];W[ib];B[na];W[ja];B[ka];W[ia];
B[rf]C[Black has to add 49.];W[qa]
C[White 50 starts a ko which White takes first. A terrible result
for Black.])
)

(;B[rg];W[pb];B[ob];W[oa];B[nb];W[jb];B[rc];W[rb];B[sb];W[ra];B[pa];
W[mf];B[ke])

(;B[qg];W[pb];B[oa];W[ob];B[nb];W[jb];B[rb])
)
)

(;B[pb];W[qg];B[rf];W[qh]C['A'. 'B' tough fight. 'C' trick.]
LB[of:C][ph:B][rb:A]
(;B[rb]LB[oh:B][ke:A]
(;W[ke];B[ph];W[pi];B[nh];W[pj];B[lf];W[mf];B[le];W[mh];B[kf];W[mi])

(;W[oh])
)

(;B[ph];W[pi];B[nh]LB[qi:B][qj:A]
(;W[qj]LB[ke:B][oi:A]
(;B[oi];W[mf]LB[rg:B][pk:A]
(;B[pk];W[qk];B[pl];W[nb];B[na];W[pa];B[ob];W[rc];B[sb];W[sc];B[sd];
W[ra];B[oa];W[rg];B[qa];W[og];B[oh];W[pa]
C[Without a big ko threat, Black is unhappy.])

(;B[rg];W[og];B[oh];W[rh];B[ke];W[lf];B[pk];W[qk];B[kd];W[nb];B[na];
W[pa];B[ob];W[rc];B[kf];W[sd];B[lg])
)

(;B[ke];W[mh];B[mi];W[oh];B[lh];W[mg];B[lg];W[li];B[jg];W[lj])
)

(;W[qi];B[oi];W[mf];B[rb];W[le];B[pj];W[oj];B[qj];W[rj];B[ri];W[ni];
B[oh];W[rh];B[rk];W[si];B[ok];W[nj];B[mh];W[qk];B[pk];W[ql];B[nk];
W[pm];B[mj])
)

(;B[of]C['A' is correct, 'B' is getting tricked.]LB[og:B][ne:A]
(;W[ne];B[ph];W[qi];B[pi];W[qj];B[pj];W[qk];B[lf];W[nh])

(;W[og];B[ph])
)
)

(;B[qg];W[pb];B[ob];W[oa];B[nb];W[kb])
)

(;W[qg];B[rf];W[rg];B[ph];W[qi];B[pi];W[qj];B[mg]
C[Black 31 is a bold tesuji.];W[ng];B[ne];W[of];B[mh];W[nh];B[ni];
W[mf];B[lf];W[lg];B[kf];W[mi];B[lh];W[oi];B[nj];W[oj];B[nk];W[pj];
B[kc];W[rc]
C[White has 30 points of territory. Black has magnificant thickness.
The result is considered far superior for Black.])

(;W[pb]C['A' or 'B' both ok.]LB[kc:B][ob:A]
(;B[ob];W[oa];B[nb];W[rc];B[qg];W[kc];B[kb];W[jc];B[jb];W[ic];B[ib];
W[hb];B[gb]C[White corner group is dead.])

(;B[kc];W[qg];B[rf];W[rg];B[ph];W[ri];B[qi];W[rh];B[of];W[ne];B[mg])
)
)

(;B[lc];W[mb];B[nb];W[lb];B[pb]LB[kc:B][oa:A]
(;W[oa];B[kb];W[kc];B[la];W[ld];B[ma];W[lc];B[na];W[jb];B[rb];W[qg])

(;W[kc];B[rb];W[ke])
)

(;B[pb];W[nb];B[mb];W[lc];B[na];W[rf];B[qg];W[rc];B[rg];W[pa];B[ob];
W[lb])
)

(;W[qg];B[rf];W[pb];B[lc];W[mb];B[qh]
C[After 'A', Black gets influence in the center, after 'B' to the
top.]
LB[og:B][lb:A]
(;W[lb];B[of])

(;W[og];B[ph];W[nf];B[lb];W[nb])
)
)

(;B[mb]
C[Black 19 was played by Iwamoto Kaoru against Kitani Minoru in
November 1947 in game 3 of the 4th Honinbo title.]
;W[lc];B[lb];W[qg];B[rf];W[ph]C[Black continues with 'a' to 'c'.]
LB[og:c][pb:b][rb:a]
(;B[rb]C[Continuation of the 1947 Kitani-Iwamoto game.];W[kc];B[og];
W[pg];B[pb];W[lf];B[mf];W[mg];B[kd];W[ic];B[jc];W[jb];B[jd];W[kb];
B[kf];W[kg];B[jf];W[gc];B[jg];W[kh];B[ge];W[db])

(;B[pb];W[kc];B[og];W[pg]
C[Black must play 'a', though he would like to play 'b'.]
LB[ke:b][rb:a]
(;B[rb];W[ke];B[mg]
C[This sequence was regarded as a perfected joseki, and quite popular
around 1950. Two Black corner moves, 25 and 29, were necessary;
this was the drawback of this pattern.])

(;B[ke]C[Black 29 is premature.];W[pa];B[oa];W[nb];B[qa];W[ra];B[na];
W[pa];B[ob];W[rc];B[sb];W[sc];B[sd];W[rg]C[White 42 is big.];B[qa]
C[Black gets first capture, but this large ko favors White, who
has little to lose.])
)

(;B[og];W[pg];B[rc]
C[Black 27 has the supposed advantage of only one Black play to
take the corner (not two, as in other variations). But White
has counter moves.]
;W[kc];B[ke]
C[White 'a', creating a ko, is better than 'b', which gives White
forcing moves.]
LB[pb:b][nb:a]
(;W[nb];B[ob];W[rb];B[rg];W[rh];B[qi];W[qh]
C[Black 'a' results in a ko. Black 'b' lets Black capture unconditionally,
but the result does not favor Black.]
LB[sc:b][sb:a]
(;B[sb];W[sc];B[sd];W[sa];B[ra];W[qa];B[pa])

(;B[sc]
C[Black 37 lets Black capture the White corner stones unconditionally.
Black pays for it by being sealed in, and having to later take
the White corner stones off the board.]
;W[kb]
C[Black must take at 'a'. Black cannot afford to play elsewhere.]
LB[dp:b][na:a]
(;B[na];W[id])

(;B[tt]C[Black plays elsewhere, a mistake.];W[oa];B[na];W[pa])
)
)

(;W[pb];B[oa];W[ob];B[nb];W[rb];B[na];W[sb];B[pa]
C[White 'a' or 'b' are sente.]LB[rg:b][kb:a]
(;W[kb];B[qa])

(;W[rg];B[qa])
)
)
)
)

(;W[pe];B[qf]LB[pf:B][pb:A]
(;W[pb];B[lc];W[mb];B[pf];W[nb])

(;W[pf];B[pg];W[nf]
C[Same position as a variation of White 16 played on 18.]
LB[pf:18][pe:16])
)

(;W[pb]C[White 16 gives Black a slightly favorable result.];B[lc];
W[mb];B[pe]C[White continues with 'a'. White 'b' is a mistake.]
LB[oe:b][nb:a]
(;W[nb];B[qf])

(;W[oe]C[White 20 is a mistake. White gets caught in a ladder.];B[of];
W[pf];B[ne];W[pe];B[pg])
)

(;W[qf]C[White 16 is not favorable.];B[pe]
C[Black 17 seems vulgar but it works.];W[oe];B[pf];W[of];B[pg]
C[White continues with 'a'. White 'b' is unreasonable.]LB[og:b][lc:a]
(;W[lc];B[og];W[nf];B[mg];W[nb];B[ng];W[ob]
C[Black has great thickness; White, about 12 points.])

(;W[og]C[White 22 is unreasonable.];B[mb];W[lc];B[lb];W[kc];B[pb]
C[White continues with 'a'. White 'b' is unreasonable.]LB[qg:b][ph:a]
(;W[ph];B[qg];W[qh];B[rg];W[ni];B[ke]
C[Besides the large corner profit, Black is able to fight in the
center with good prospects.])

(;W[qg]C[White 28 is self-destructive.];B[ph];W[qh];B[qi];W[ri];B[oh]
C[White may try 'a' or 'b'.]LB[mf:b][mg:a]
(;W[mg];B[qj];W[rf];B[rb];W[rj];B[nh]
C[Now 'a' and 'b' are miai. White loses either way.]LB[rk:b][ng:a])

(;W[mf];B[qj];W[rf];B[rb];W[rj];B[nh];W[qk];B[nf];W[ng];B[mg]
C[Snapback.])
)
)
)

(;W[of];B[qf]C[White continues with 'a'. White 'b' is less favorable.]
LB[nf:b][mf:a]
(;W[mf];B[mb]C[Black sacrifices the two stones in sente.];W[lc];B[lb];
W[kc]C[Black continues with 'a' or the more aggressive 'b'.]
LB[kb:b][pb:a]
(;B[pb];W[le])

(;B[kb]C[White continues with 'a'. White 'b' is risky.]LB[jc:b][le:a]
(;W[le];B[jc])

(;W[jc];B[ne]C[Black sets his stones in motion.];W[oe];B[nf];W[ng];
B[mg];W[og];B[lf]C[The ponnuki gives Black a reasonable result.];W[pb]
;B[oa]C[Black 33 is the tesuji that puts Black one move ahead.];W[ob];
B[nb];W[jb];B[na])
)
)

(;W[nf]C[White 18 is not recommended.];B[mb];W[lc];B[lb];W[kc];B[pb];
W[lf]C[White's shape is thin.])
)
)

(;W[qf];B[rb]C[White continues at 'a'. White 'b' is a mistake.]
LB[pb:b][mc:a]
(;W[mc];B[lc];W[mb];B[pb];W[kc];B[me]
C[White is in trouble. 'a' and 'b' are miai for Black. If, however,
the ladder is favorable for White, there is a way out.]
LB[of:b][lb:a];W[of]
C[White plays this way if the ladder is favorable at the red dot.

Black continues with 'a' or 'b'.]
LB[kd:b][lb:a]CR[ld]
(;B[lb];W[nb];B[rc];W[ld];B[kb];W[jb]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[jc:b][kd:a]
(;B[kd];W[le]C[Black continues with 'a' or 'b'.]LB[ke:b][mf:a]
(;B[mf];W[jc]
C[Black captures the White stones in a ladder if possible with
'a'. 

If White has the ladder, squeezing with 'b' is good enough for
Black.]
LB[kf:b][ke:a])

(;B[ke]
C[Black plays 31 with an unfavorable ladder, sacrificing two Black
stones.]
;W[lf];B[jc];W[mf])
)

(;B[jc]C[Black 29 is a mistake.];W[kd];B[ib];W[jd];B[ic];W[mf];B[le];
W[kf]C[White squeezes with 34 and 36.])
)

(;B[kd];W[lb];B[jd]C[Black 25 is adequate.])
)

(;W[pb]C[White 16 is a mistake.];B[lc])
)
)

(;B[rb]
C[White continues with 'a'. White 'b' is an early alternative to
the joseki that developed, and not recommended.]
LB[rc:b][mc:a]
(;W[mc]
C[Black continues with 'a'. Black 'b' is not recommended. Black
'c' is something of a trick play that should not work if White
plays carefully.]
LB[lc:c][mb:b][pb:a]
(;B[pb];W[lc]
C[Black continues with 'a' or 'b', or, with a favorable ladder
(in capturing Black 9) 'c'.]
LB[of:c][ld:b][me:a]
(;B[me];W[of]
C[Black continues with 'a' or 'b'. Black must have the ladder to
play 'b'.]
LB[jd:b][kd:a]
(;B[kd])

(;B[jd]C[Black must have the ladder to play 19.];W[ke];B[kd];W[ld];
B[le]
C[Now the issue of whether Black can capture White 20 in a ladder.

White continues with 'a'. White 'b' is premature.]
LB[je:b][lg:a]
(;W[lg]C[White plays 24 if Black cannot capture White 20 in a ladder.]
;B[kf];W[je];B[lf];W[id];B[kb];W[nb];B[rc];W[jb]
C[White 32 is a tesuji to get Black to cut at the marked location.]
CR[ie];B[kc];W[lb];B[la];W[mb];B[ie];W[jf];B[ic];W[hd];B[ib];W[kg];
B[mg]C[If Black 43....];W[mf]
C[... White throws in and sets up a ladder.];B[nf];W[ne];B[mf];W[mh])

(;W[je]
C[White 24 is a mistake.

Black continues with 'a'. Black 'b' is slack.]
LB[id:b][kb:a]
(;B[kb];W[nb];B[rc];W[id];B[mb]
C[The throw-in of Black 29 puts White one move behind.];W[lb];B[la];
W[ma];B[ka]C[White loses.])

(;B[id]C[Black 25 is a mistake.];W[nb];B[rc];W[lg];B[mg];W[mf];B[lf];
W[kf];B[nf];W[ne];B[mf];W[mh])
)
)
)

(;B[ld]
C[Black 17 is tough-minded.

White continues with 'a'. White 'b' is a mistake.]
LB[kd:b][kc:a]
(;W[kc];B[kd]C[White continues with 'a'. White 'b' is slack.]
LB[jc:b][jd:a]
(;W[jd]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[jc:b][je:a]
(;B[je];W[id];B[of];W[ne];B[mf];W[nf];B[ng];W[og];B[nh];W[re];B[rc];
W[pg])

(;B[jc]C[Black 21 is a mistake.];W[ic];B[jb];W[nb]
C[White 24 is the reason the cut of Black 21 is unreasonable.];B[qa];
W[ib])
)

(;W[jc]C[White 20 is slack.];B[of];W[ne];B[jd];W[id];B[ie];W[hd];B[nf]
;W[me];B[lf]
C[White is short of liberties and cannot break through the Black
net.])
)

(;W[kd]C[White 18 is rash.];B[mf]
C['a' and 'b' are miai. White is in trouble.]LB[of:b][kc:a])
)

(;B[of]
C[Black can play 17 only if the ladder to capture Black 9 is not
favorable for White.]
;W[ne];B[pe];W[nf];B[qf];W[nh])
)

(;B[mb];W[lc];B[lb];W[kc];B[me];W[of]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[re:b][rc:a]
(;B[rc]C[Black must play 21; the alternatives are not favorable.];
W[ke];B[mg];W[oh])

(;B[re]C[Black 21 is not recommended.];W[qf];B[rf];W[qg];B[ke];W[id];
B[lh];W[pa]
C[White 28 is a great tesuji, often appearing in old avalanche
sequences.]
;B[nb];W[rc]
C[White sets up a 'flower-viewing' ko: Black has everything to
lose.];
B[sc];W[sb])
)

(;B[lc]
C[Black 15 is a trick play, though not obviously so. White continues
with 'a'. White 'b' falls into the trap.]
LB[mb:b][rc:a]
(;W[rc];B[re];W[mb];B[pb];W[sb];B[nb];W[lb];B[ra];W[qa]
C[Black loses the capturing race. Black best continue with 'a'.
Black 'b' is not recommended.]
LB[qf:b][oa:a]
(;B[oa];W[qf];B[kc];W[rf];B[kb];W[me];B[ld]
C[White has a favorable result.])

(;B[qf]C[Black 25 is not recommended.];W[me];B[ld];W[oa];B[kb];W[na])
)

(;W[mb]C[White 16 falls for the trick.];B[pb]
C[White loses. White continues with 'a'.

White 'b', Black 'a', is ridiculous for White.]
LB[lb:b][kc:a]
(;W[kc];B[me];W[lb];B[of];W[pf];B[ne];W[pe];B[pg];W[re];B[rc];W[qg];
B[ph];W[qh];B[qi];W[ri];B[rj]
C[White concedes with 'a', or struggles to cause trouble with 'a'.]
LB[pi:b][sh:a]
(;W[sh];B[pi])

(;W[pi];B[qj];W[oi];B[nh];W[sh]
C[Black now has the two White center stones as a fresh target.])
)

(;W[lb]
C[If you are considering this variation, now is a good time to
take up chess.]
;B[kc])
)
)
)

(;W[rc]C[White 14 is not recommended.];B[re]
C[White continues with 'a' or 'b'.]LB[qf:b][ra:a]
(;W[ra]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[sb:b][qf:a]
(;B[qf]C[White continues with 'a'. White 'b' is a reckless mistake.]
LB[mc:b][of:a]
(;W[of];B[lc];W[pb];B[ph]
C[Black has nice shape on both sides, with White on the run in
the center. Nice for Black.])

(;W[mc]C[White 18 is a reckless mistake.];B[me];W[pb];B[mb];W[lc];
B[nb];W[of];B[oe])
)

(;B[sb]
C[Black 17, trying to prevent White from getting two eyes in the
corner, is not recommended.]
;W[pb])
)

(;W[qf];B[sc];W[mc];B[lc];W[mb];B[pb])
)
)

(;B[pe]C['A' is joseki, 'B' is also possible.]LB[of:B][pf:A]
(;W[pf];B[rb]C['A' is joseki, 'B' is not good.]LB[rc:B][oe:A]
(;W[oe];B[rc];W[mc];B[lc];W[mb];B[lb];W[nb];B[pb];W[ld];B[me];W[kd]
C['A' is joseki, 'B' is a severe mistake.]LB[jc:B][ma:A]
(;B[ma];W[lf];B[mf];W[mg]
C[This is the most easy and peaceful variation 2005 according to
Oya Koichi 9P.])

(;B[jc];W[lf];B[mf];W[mg];B[ma])
)

(;W[rc];B[re];W[oe];B[sc];W[mc];B[lc];W[ra];B[sb];W[mb];B[pb];W[kc];
B[me];W[lb];B[ke];W[hc];B[og];W[pg];B[oh]
C[Playing on 'A' creates dane-zumari and isn't good for White.]
LB[nf:A])
)

(;W[of];B[qf];W[mc];B[mb];W[lc];B[lb];W[kc];B[kb];W[pb];B[ob];W[oa];
B[nb];W[jb]C['A' is correct, 'B' is wrong.]LB[re:B][me:A]
(;B[me])

(;B[re];W[me])
)
)
)

(;B[mc]
C[Black 9, a bit submissive, but adequate, and avoids the avalanche.

White continues with 'a'. White 'b' is not recommended as giving
a locally equal result, but may make strategic sense.]
LB[md:b][rd:a]
(;W[rd];B[qc];W[pf])

(;W[md]
C[White 10 only makes sense strategically; locally it results in
a loss.]
LB[re:b][ld:a]
(;B[ld];W[qc];B[rd];W[qb];B[re];W[lc];B[lb];W[kc];B[kb];W[qf];B[rf];
W[qg];B[rg]C[Now 'a' and 'b' are miai for Black.]LB[qh:b][jc:a];W[jc];
B[qh];W[jb];B[pb];W[of];B[oh])

(;B[re];W[qc];B[rd];W[lc];B[qb];W[ld]C['a' and 'b' are miai.]
LB[gc:b][qf:a];B[qf];W[gc]
C[White needs to extend at least as far as 18 to compensate for
the loss in the corner.])
)
)

(;B[re]C['A' is correct, 'B' is a mistake.]LB[qc:B][rd:A]
(;W[rd];B[qc];W[rf]C['A' or 'B'.]LB[pe:B][md:A]
(;B[md];W[pf])

(;B[pe];W[qf];B[md];W[of])
)

(;W[qc];B[rd];W[mc];B[qb];W[md];B[qf])
)

(;B[rd];W[md];B[re];W[qf])
)

(;W[rd]C[White avoids the avalanche.];B[qc]
C['A *' is joseki, but the White formation is without extension.
'B' sers up a Mini Chinese opening.]
LB[qk:B][pf:A]
(;W[pf]C[
* GOOD VARIATION *])

(;W[qk];B[qf]
C['A' is possible.
After 'B' White is heavy, Black light. 'B' is possible if the
White extension is nearer.]
LB[pe:B][rf:A]
(;W[rf];B[pe];W[re]C['A' is correct, 'B' is a mistake.]LB[qg:B][pf:A]
(;B[pf];W[qg];B[pg];W[qh]
C[White territory and aji for Black thickness.]PL[2];W[ph]
C[To understand the aji of the two marked stones, lets assume,
later White plays here.]
TR[od][pd];B[ng];W[nf]C['A' is correct, 'B' leads to bad shape.]
LB[mf:B][og:A]
(;B[og];W[mg];B[mh];W[lg];B[lh];W[kh];B[ni];W[kg];B[ne];W[kd])

(;B[mf];W[og];B[ne];W[oe];B[of];W[nf];B[of])
)

(;B[qg]C[Mistake!];W[pf];B[oe];W[ph];B[qh];W[pi];B[rj];W[ri];B[qi];
W[qj];B[rh];W[rk];B[si];W[rc];B[rb];W[sb];B[qa];W[sg];B[rg];W[sk];
B[sf];W[of];B[ne];W[sj]C[Ko.])
)

(;W[pe];B[rf];W[qi])
)
)

(;W[dp];B[rd];W[pj])
)

(;B[rd]
C[Black 7 has the advantage of Black later extending down the right
from Black 7. White continues with 'a'. White 'b' may be possible
with support on the right.]
LB[nc:b][nd:a]
(;W[nd]
C[White treats Black 7 as equivalent to a solid connection at 'a',
so White 8 is the only move, but unlike the solid connection,
a potential cutting point at 'a' remains.]
LB[qc:a];B[re];W[qf];B[mb];W[pk])

(;W[nc];B[nd];W[nb];B[ne];W[pe];B[re]
C[Unless Black can the two White cutting stones, Black 13 is advised.
Black 'a' is too submissive.]
LB[qb:a];W[qg])
)
)

(;W[tt]
C[White plays elsewhere. Possible local Black continuations include
'a' to 'c'.]
LB[pc:c][pd:b][nc:a])

(;W[pc]C[White 4 is not joseki.];B[pd];W[qc])

(;W[nd]
C['A' is good for Black. 'B' and 'C' are known joseki in different 
orders.]
LB[nc:C][pc:B][pd:A]
(;B[pd];W[nc];B[ob])

(;B[pc];W[nc]
C[Same position as White 6 and Black 5 played before White 4, see 
there for continuation.]
LB[pc:5][oc:3][nc:6][nd:4])

(;B[nc];W[pd];B[pc];W[qe]
C[Same position as the large avalanche joseki referenced by the 
numbers, see there for continuations.]
LB[nd:8][nc:7][qe:6][pc:5][pd:4][oc:3][od:2][qd:1])
)
)

(;B[oe]
C[
Ue-zuke (attach on top)
--------------------------

The idea of Black 3 is not to fall behind in influence. White
continues with 'a *' to 'c *'. 

White can only play 'c' with a favorable ladder to the lower
left corner. White suffers a serious loss of territory with potentially
no compensation if the ladder is not favorable and Black plays
most serverly.

White 'd' is not joseki. White loses the corner.
'e' is totally wrong.

a1 - Black choice
b2 - Black right, White top
c3 - Black choice; White must have the ladder or lose
d4 - White loses the corner
]
LB[pd:e][pe:d][qc:c][nd:b][ne:a]
(;W[ne]
C[Black continues with 'a *' or 'b'. Black 'a' is typical. 

Black 'b' shows a tough attitude. If White plays in an equally
uncompromising way, a large-scale complex fight can result. 'b'
can also protect a moyo on the right by disabling White o14.

'c' is a trick play.]
LB[nd:c][of:b][pe:a]
(;B[pe]
C[White continues with 'a *' to 'c *'. White 'd' is not recommended.

a1 - Black choice of territory or influence
b2 - Black corner; toward the top (sacrificing Black 3 & 5)
c3 - White influence, oriented towards top, but sacrificing a
large corner]
LB[nf:c][qc:b][md:a]
(;W[md]
C[Black continues with 'a *' for territory or 'b *' for influence.

White 'c' is an old pattern, no longer considered joseki.

Tenuki 'd' is possible.]
LB[dp:d][nc:c][nf:b][oc:a]
(;B[oc]C[This move has a value of 30 points.
];W[nc];B[ob]
C[
* GOOD VARIATION *

White continues with 'a' or 'b', or plays elsewhere.]
LB[ic:b][ng:a])

(;B[nf];W[mf]C[Black continues with 'a' or 'b *'.]LB[mg:b][ng:a]
(;B[ng];W[mg];B[nh]
C[The joseki ends. A White play at 'a' is unreasonable. Black 'b'
secures considerable profit.]
LB[oc:b][qc:a];W[qc]C[White 12 is unreasonable (not joseki).];B[pc];
W[pd];B[oc];W[nd];B[qb]
C[White cannot gain anything by cutting at 'a'. If White 'b', Black
'a' and it is all over.]
LB[rc:b][qe:a])

(;B[mg]
C[The two-step hane was not seen in classical Go. They are unyielding
moves peculiar to modern Go.]
;W[ng];B[of];W[lf]
C['A *' and 'B *' are joseki. Black 'C' is mild. 

Variation 'D' shows continuation if Black plays elsewhere.]
LB[dp:D][mh:C][nh:B][lg:A]
(;B[lg]C[White continues with 'a *' or 'b'.]LB[kg:b][kf:a]
(;W[kf];B[nh]
C[
* GOOD VARIATION *

The joseki concludes. But the question of whether White plays
'a' or Black plays 'b' is important for corner profit. That Black
'b' is possible is a matter of course, but Black can counterattack
against White 'a'.]
LB[oc:b][qc:a];W[qc]
C[Continuation. White is naturally eager to play 16.

Black continues with 'a'. Black 'b' is unreasonable.]
LB[pc:b][pd:a]
(;B[pd];W[pc];B[oc];W[nd];B[ob];W[pb];B[mb]
C[White continues with 'a' or 'b'. White 2 is a tough move resulting
in continued fighting.]
LB[pa:b][rd:a]
(;W[rd];B[re];W[mc];B[nb];W[lb];B[rc];W[rb];B[sd];W[pa];B[ra];W[ma];
B[qb];W[na];B[sb];W[nc])

(;W[pa]C[White 2 is a strong answer.];B[lb];W[rd];B[re];W[jb]
C[Future prospects are uncertain.])
)

(;B[pc];W[pd];B[oc];W[nd];B[qb];W[qe];B[rc];W[og]
C[Black can save his stones with 'a', but the three center stones
are adrift.]
LB[pf:a])
)

(;W[kg]
C[Black can cut at 'A'. Sometimes simply playing 'B' is enough.]
LB[nh:B][kf:A]
(;B[kf]C[White continues with 'a', or 'b' if the ladder is favorable.]
LB[je:b][kd:a]
(;W[kd]C[White 16 if White does not have the ladder.];B[jf];W[kh];
B[nh])

(;W[je]C[White 16 if White has the ladder.];B[nh];W[jf])
)

(;B[nh];W[jf])
)
)

(;B[nh];W[lg];B[mh]C[
* GOOD VARIATION *])

(;B[mh]C[Black 13 is too mild.];W[qc];B[rc];W[pc])

(;B[tt]C[Black plays elsewhere. White continues with 'a' or 'b'.]
LB[qc:b][nh:a]
(;W[nh];B[oc];W[nc];B[ob])

(;W[qc];B[rc];W[pc];B[nh];W[lg];B[og];W[mi])
)
)
)

(;B[nc]C[White 7 is an old pattern, no longer considered joseki.];
W[nd];B[oc]C[White continues with 'a'. White 'b' is too mild.]
LB[mc:b][pd:a]
(;W[pd];B[pc];W[qe]C[White 12 is a sacrifice manoeuvre.];B[qf];W[re];
B[rd];W[rf];B[qg];W[qc];B[rc];W[qb];B[rb];W[mc];B[mb];W[pb];B[ob];
W[oa];B[nb];W[lb];B[qa]
C[White continues at 'a', or if the ladder is favorable, at 'b'.]
LB[pf:b][og:a]
(;W[og];B[pf];W[qh];B[rg];W[rh]
C[White ends in gote, but has powerful thickness, plus forcing
moves at 'a' and 'b'.]
LB[pg:b][of:a])

(;W[pf]C[White must have the ladder to play this way.];B[of];W[og]
C[Black continues at 'a' or 'b'.]LB[nf:b][pg:a]
(;B[pg];W[nf];B[pf];W[oh];B[rg];W[rh];B[qh];W[qi];B[ri];W[qj])

(;B[nf];W[pg]C[White 'a' and 'b' are miai.]LB[qh:b][mf:a])
)
)

(;W[mc]C[White 10 is not recommended, as it is not severe enough.];
B[pd];W[ic]C[The result favors Black.])
)

(;B[tt]LB[ng:A][qc:B]
C['A' is usual, 'B' is possible, a ladder is helpful here.
]
(;W[ng];B[pg])

(;W[qc]LB[pc:A][rc:B]
C['A' was considered disadvantageous, but Wu Qingyang = Go Seigen changed the opinioni.
'B' is necessary if Black already has an extension on the right side.
]
(;B[pc];W[pd];B[oc];W[nd];B[qb];W[qe];B[rc];W[rd];B[qc];W[pf];AW[dp];
B[fp];W[of];B[dn]
C[Even if White has the ladder, the result is good for Black.
])

(;B[rc];W[pc]LB[rb:A][re:B]C['A' or 'B' are ok.
]
(;B[rb])

(;B[re])
)
)
)
)

(;W[qc]C['A' is ok, 'B'.]LB[nd:B][pc:A]
(;B[pc];W[pd];B[oc];W[nd];B[qb];W[qe];B[rc];W[rd];B[qc]
C[White continues with 'a' or 'b', depending on the ladder. If
the ladder to the lower left favors White, White plays 'a'. If
the ladder is unfavorable, White plays 'b'.]
LB[of:b][pf:a]
(;W[pf]C[White 16 if a favorable ladder.])

(;W[of];B[pf];W[pg];B[qf];W[qg]C['A' or 'B'.]LB[re:B][rf:A]
(;B[rf])

(;B[re];W[rf];B[qe];W[og])
)
)

(;B[nd]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.])
)

(;W[nf]C[White strongly favors influence and the top with White 6.];
B[nd];W[md];B[nc];W[mc]C['A *' is joseki, 'B' is less favorable.]
LB[nb:B][ob:A]
(;B[ob];W[nb];B[oc]C[
* GOOD VARIATION *])

(;B[nb];W[mb]PL[2];W[pc];B[oc];W[na];B[pd];W[ob])
)

(;W[nd]
C[White 6 is slow.

Black 'a' is the vital point. Black 'b' is a mistake.]
LB[og:b][pc:a]
(;B[pc]C[White continues with 'a' in preference to 'b'.]LB[jd:b][ng:a]
(;W[ng];B[ph])

(;W[jd];B[nb]
C[Black 9 makes White's stones float without a territorial base.])
)

(;B[og]C[Black 1 is loose, a natural-looking move that is a mistake.];
W[qc]C[White 8 is sente.];B[rc];W[pc];B[rb];W[jc])
)
)

(;B[of]C[White continues with 'a' or 'b'.]LB[md:b][pd:a]
(;W[pd];B[qe]
C[Next, White 'a'is the strongest move. Other moves which give
up the 3-3 point are a compromise. White 'b' is playable. White
'c' is the standard move at top. White 'd' does not give a favorable
result. White 'e' is an old pattern.]
LB[pb:e][md:d][kd:c][nd:b][qc:a]
(;W[qc]
C[Black continues with 'a' to 'c'. The cut at 'a' is natural, while
'b' avoids complications and takes sente, but can also be seen
as backing down from the original challenge.]
LB[rc:c][qg:b][nd:a]
(;B[nd]C[White 'a' is joseki. White 'b' is unreasonable.]
LB[md:b][nc:a]
(;W[nc];B[md];W[mc];B[ld];W[lc];B[kd];W[pe];B[pf];W[qf]
C[Black continues with 'a' or 'b'.]LB[qg:b][rc:a]
(;B[rc];W[pb];B[rf];W[qg];B[rg];W[qh];B[rb]
C[White continues with 'a' or 'b'.]LB[ng:b][jb:a]
(;W[jb];B[nf])

(;W[ng];B[nf];W[mf]C[Black continues with 'a' or 'b'.]LB[mg:b][me:a]
(;B[me];W[mg];B[kc];W[kb];B[jb];W[la])

(;B[mg]LB[og:A][mh:B][mf:28]
C['A' fights with 28. 'B' sacrifices 28 to strengthen the right side.
]
(;W[og];B[me];W[lf];B[kc];W[kb];B[jb];W[la];B[mh];W[kg])

(;W[mh];B[lg];W[og];B[me])
)
)
)

(;B[qg];W[rf];B[ph]C[White continues with 'a' or 'b'.]LB[jc:b][rd:a]
(;W[rd];B[kc])

(;W[jc];B[pc];W[oc];B[rc];W[qb];B[re];W[rb];B[rg])
)
)

(;W[md]C[White 10 is a mistake.];B[nc];W[mc]
C[Black continues with 'a'. If Black 'b', White plays 'c', and
the unreasonable move of White 10 succeeds.]
LB[mb:c][nb:b][ob:a];B[ob];W[pb];B[mb]
C[White is at a loss for how to proceed.])
)

(;B[qg];W[pb]
C[White 10 is correct shape, guarding against 'a' and 'b'.]
LB[nd:b][rc:a])

(;B[rc];W[pb];B[qb];W[pc];B[rb];W[md];B[qg])
)

(;W[nd]C[White 8 is possible, but not often seen in actual play.];
B[qc];W[jc]
C[The position of White 10 is flexible, depending on the situation
in the top-left corner.])

(;W[kd];B[qc]
C[White ignores Black 9 and plays elsewhere. This pattern is sometimes
seen in professional games, but Black has the move at 'a', so
White undeniably seems thin.]
LB[ob:a])

(;W[md]
C[White 8 is not recommended.
'A' is usual, 'B' keeps a moyo, which is already on the right
side.]
LB[mg:B][nc:A]
(;B[nc];W[nd];B[qc]
C[White has no good followup. White 'a', keeping the peep stone
separated from the others, does not give White good shape.]
LB[pb:a];W[pb];B[mb];W[ob];B[kc])

(;B[mg])
)

(;W[pb]C[White 8 is an old pattern.];B[qc];W[lc])
)

(;W[md];B[pd];W[oc];B[pj];W[ic])
)

(;B[nd]C['A' is correct, 'B' is getting tricked.]LB[nc:B][pe:A]
(;W[pe];B[of];W[nc]C['A' is correct, 'B' is a mistake.]LB[md:B][pd:A]
(;B[pd];W[md];B[pg];W[pc];B[qc];W[nf];B[oh]
C[Black's attempt not to fall behind in influence failed.];W[id])

(;B[md];W[pd])
)

(;W[nc];B[md];W[pe];B[pd];W[of];B[oc])
)
)

(;W[nd];B[pd];W[ne];B[of];W[jc])

(;W[qc]
C[White 4 is an attempt to complicate the situation, and can lead
to undreamed-of variations. 

Black responds with 'a *', 'b *' or 'c'. Black 'a' is usual.
Black 'b' is also easy to understand. 

Black 'c' is a scary move leading to complications, and a serious
loss of territory in the corner for White if Black has a favorable
ladder.

Black 'd' does not appear in joseki books.]
LB[rc:d][pd:c][pe:b][nd:a]
(;B[nd]
C[White continues with 'a *'. 

White 'b' is submissive. 

White 'c' is heavy.]
LB[pc:c][oc:b][pd:a]
(;W[pd];B[pe];W[qe];B[rd]
C[White continues with 'a *'. White 'b' is a trick play.]
LB[re:b][rc:a]
(;W[rc]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[qf:b][ob:a]
(;B[ob]C[White continues with 'a *'. White 'b' is a mistake.]
LB[pc:b][re:a]
(;W[re];B[pc];W[sd];B[qd]
C[White continues at 'a *'. White playing at the red dot would
be pointless.

White should not play elsewhere ('b').]
LB[dp:b][qh:a]CR[rd]
(;W[qh]C[
* GOOD VARIATION *])

(;W[tt]
C[White plays elsewhere. Black continues with 'a', or 'b' if the
position merits taking the right side.]
LB[rg:b][ph:a]
(;B[ph]
C[Black forces White low at 'a'. White plays elsewhere with 'b'
(not recommended, but White can live).]
LB[cq:b][rg:a]
(;W[rg]C[White aims to cut later.];B[dd]C[Black plays elsewhere.];
W[pf]C[White's continuation.];B[of];W[pg];B[og];W[oh]
C[The cut White was aiming at.])

(;W[tt]C[White plays elsewhere.];B[rg];W[pb];B[oc];W[qa]
C[White lives (barely) in the corner, but the result is a big loss
locally.])
)

(;B[rg]C[Black 17 emphasizes territory on the right side.];W[qg];B[qh]
;W[pf];B[ph];W[of];B[ne])
)
)

(;W[pc]C[White 12 is a mistake.];B[qf];W[re];B[rf];W[sd];B[ne])
)

(;B[qf]C[Black 11 is resourceless.];W[re];B[rf];W[sd];B[ne]
C[Connecting in gote is not good enough.])
)

(;W[re];B[rc];W[qb]
C[Black 'a' foils the trick play. Black 'b' is a mistake.]
LB[rb:b][qf:a]
(;B[qf];W[rf];B[rg];W[qg];B[pf];W[rh];B[pg];W[qh];B[ob];W[pc];B[rb])

(;B[rb]C[Black 13 is a mistake.];W[ob]
C[The four black stones can be captured.])
)
)

(;W[oc]C[Black 6 is submissive.
'A' is correct, 'B' is questionable.]
LB[pe:B][nc:A]
(;B[nc];W[nb];B[mb];W[pb];B[na];W[ob];B[ne])

(;B[pe]C['A' is correct, 'B' is a mistake.]LB[rc:B][pb:A]
(;W[pb];B[mf])

(;W[rc];B[nc];W[nb];B[mb];W[ob];B[ne])
)
)

(;W[pc]C[White 6 is not recommended.];B[ne]
C[Black 7 is simple: Black goes for influence. White may try 'a'
or 'b'.]
LB[nc:b][pe:a]
(;W[pe];B[pf])

(;W[nc];B[mc])
)
)

(;B[pe]C[White continues with 'a *'. White 'b' is a mistake.]
LB[pc:b][nd:a]
(;W[nd];B[ne];W[md];B[rc];W[pc]C[Black continues with 'a *' or 'b'.]
LB[rb:b][qj:a]
(;B[qj]
C[
* GOOD VARIATION *

White continues with 'a' or 'b' or elsewhere.]
LB[rb:b][ic:a]
(;W[ic])

(;W[rb])
)

(;B[rb];W[ic])
)

(;W[pc]C[White 6 is a mistake.];B[nd];W[nc];B[md];W[mc];B[ld];W[kc];
B[qj]C[White is much worse off than the joseki variation.])
)

(;B[pd]
C[Black 5 is a strong move. White better have the ladder or is
in serious trouble.]
;W[pc]C['A' is correct, 'B' and 'C' are possible.]LB[nd:C][ne:B][oc:A]
(;B[oc];W[nd]
C['A' makes two groups on both sides, while White gets a small
corner and a running center group.
'B' gives the top side in gote for a big wall. 'B' punishes if
White doesn't have the ladder.]
LB[ob:B][nc:A]
(;B[nc];W[mc];B[mb];W[md]C['A' is correct, 'B' doesn't work.]
LB[pb:B][lb:A]
(;B[lb];W[rd];B[re];W[rc];B[qe]C['A' or 'B' give the same result.]
LB[ob:B][pb:A]
(;W[pb];B[ob];W[oa];B[nb];W[rb];B[kd];W[mf])

(;W[ob];B[nb];W[pb];B[kd];W[mf])
)

(;B[pb];W[qb];B[ob];W[rd];B[re];W[rc];B[qe];W[lb];B[na];W[pa];B[sb];
W[qa];B[oa];W[la])
)

(;B[ob];W[rd]
C[Black continues with 'a' if a favorable ladder, or 'b' if the
ladder is unfavorable.]
LB[rc:b][re:a]
(;B[re]C[Black must have the ladder to play this way.];W[rc];B[qe]
C[White plays 'a' if the ladder is favorable to White, but must
play 'b' if the ladder is unfavorable.]
LB[mc:b][nc:a]
(;W[nc]C[White 14 only works if White has the ladder.];B[nb];W[mb];
B[mc];W[lb]
C[Black plays 'A' if he doesn't have the ladder, starting at 'B' or 'C'.
]
LB[me:A][lc:B][md:C]
(;B[me];W[md];B[ld];W[lc];B[ne];W[mc];B[kd])

(;B[lc];W[pb];B[ne])

(;B[md];W[ne];B[nf])
)

(;W[mc]
C[White must play 14 here if the ladder favors Black, but the White
corner stones die. White gets some thickness at top as compensation,
but the result clearly favors Black.]
;B[pb]C['A' or 'B'.]LB[ne:B][qb:A]
(;W[qb];B[mb];W[lb];B[nb];W[lc];B[ra];W[qa]C[This is no help.];B[sd]
C[White cannot live, and Black wins the fight.];W[nc];B[sc];W[sb];
B[se];W[ma];B[pa])

(;W[ne];B[mb];W[lb];B[nb];W[of];B[qh];W[kc])
)
)

(;B[rc];W[rb];B[qb];W[sc];B[pb];W[rc];B[qf]
C[White continues with 'a' or 'b'.]LB[mc:b][re:a]
(;W[re];B[ne];W[md];B[lc]C[The future is uncertain.])

(;W[mc]C[Black continues with 'a' or 'b'.]LB[mb:b][re:a]
(;B[re];W[ne];B[ra];W[of];B[qg])

(;B[mb];W[lb];B[nc];W[md];B[na];W[re];B[pg];W[rf];B[rg];W[ra]
C[Both sides make live groups in the corner. The Black cut at 'a'
necessitates a favorable White ladder, or White faces a tough
fight.]
LB[lc:a])
)
)
)
)

(;B[ne]C['A' is correct, 'B' is a mistake.]LB[nd:B][nc:A]
(;W[nc]
C['A' is a recent Korean invention enabling Black to play the extension to his wall.
'B' fears the White cut, but is possible,
'C' is an old variation pressing White down. It's very nice with an additional Black stone on or near the triangled point. Without it it's a mistake, because White will take away the extension from the wall.
]
TR[qk]LB[ld:A][re:B][mc:C]
(;B[ld]C['A' is correct. After 'B', White is enclosed.]LB[pe:B][lb:A]
(;W[lb];B[qk])

(;W[pe]
C['A' takes influence for a White corner with weaknesses.
'B' takes influence or starts a fight.]
LB[rd:B][pf:A]
(;B[pf];W[qe];B[rd];W[rf];B[rc];W[rb];B[qb];W[pb];B[ra];W[sb];B[qh];
W[re];B[mc]C[Later, Black can enclose White with 'A'.]PL[2]
LB[pa:B][nd:A];B[nd];W[oc];B[nb]C[Threat of a flower viewing ko on A.]
LB[pa:A];W[qa])

(;B[rd]C['A' takes territory.
'B' is experimental and starts a fight.]
LB[pf:B][qe:A]
(;W[qe];B[rf]C['A' gives Black thickness.
'B' is experimental.]
LB[qg:B][re:A]
(;W[re];B[nd]
C['A' gives Black thickness to the right, 'B' to the top.]
LB[rc:B][oc:A]
(;W[oc];B[pf];W[rc];B[qf];W[sd])

(;W[rc]C['A' is correct, 'B' is a mistake.]LB[sd:B][oc:A]
(;B[oc];W[sd];B[od];W[qg]C[Later Black A.]LB[qi:A])

(;B[sd];W[oc];B[pf];W[sc];B[qf];W[se]C[Later White A can be possible.]
LB[rh:A])
)
)

(;W[qg];B[qf];W[pf];B[pg];W[of];B[re];W[ph];B[nd];W[oc];B[og];W[nf];
B[qh];W[ng];B[oh];W[nh];B[oi];W[le])
)

(;W[pf];B[rc];W[lb];B[qb];W[pb];B[qa];W[kc];B[og];W[pg];B[oh];W[ph];
B[oi];W[re];B[pi];W[sd])
)
)
)

(;B[re];W[kc])

(;B[mc];W[mb]C['A' or 'B'.]LB[nd:B][lc:A]
(;B[lc];W[nd];B[me];W[lb];B[jc]C[White A is only endgame.]LB[pe:A];
W[qk])

(;B[nd];W[oc];B[lc];W[lb]C['A' or 'B'.]LB[jc:B][kc:A]
(;B[kc];W[qk])

(;B[jc];W[kc];B[kd];W[kb];B[jd]
C['A' takes the extension away from the wall, 'B' is endgame.
]
LB[qk:A][pe:B]
(;W[qk])

(;W[pe]C[The cut is only an endgame move.];B[pf];W[qe];B[rd]
C[Neither 'A' nor 'B' help.]LB[qf:B][rf:A]
(;W[rf];B[qf];W[re];B[rg];W[rc];B[qh])

(;W[qf];B[qg];W[pg]C['A' or 'B' are good.]LB[rf:B][of:A]
(;B[of];W[rg];B[qh];W[re];B[se];W[rf];B[rh];W[rc];B[oi])

(;B[rf];W[of];B[re];W[pf];B[qh];W[nf];B[md];W[ni];B[qk])
)
)
)
)
)
)

(;W[nd];B[md];W[mc];B[lc])
)

(;B[nd];W[oc]C['A' or 'B' are ok.]LB[nc:B][pf:A]
(;B[pf];W[ne];B[md];W[nf];B[nb];W[nc];B[mc];W[ob];B[ph];W[lf];B[id])

(;B[nc];W[ne];B[of];W[rd];B[re];W[rc];B[qf];W[me];B[lc];W[ld];B[mb];
W[nb];B[mc])
)
)

(;B[rc]
C[Black 5 does not appear in joseki books.

As a reply, White 'A' is possible.
'B' gives huge influence for a small corner.
'C' is a mistake.]
LB[rd:C][pd:B][pc:A]
(;W[pc];B[re];W[ne];B[of];W[qf];B[pd];W[nd];B[qi];W[jc])

(;W[pd];B[pe];W[rd];B[qe];W[rb];B[pc];W[sc];B[nd];W[oc];B[nc];W[ob];
B[nb];W[pb];B[mf])

(;W[rd]
C[Black punishes by making the corner a favorable ko on 'A' or
by taking huge influence on 'B'.]
LB[qe:B][re:A]
(;B[re];W[pd];B[qe];W[rb]
C['A' attacks the corner, 'B' builds influence to the right side.]
LB[sd:B][pc:A]
(;B[pc];W[sc];B[qb];W[rc];B[pb];W[nc];B[nb];W[mb];B[ob];W[mc];B[ra];
W[qa];B[pa];W[na];B[se];W[sa];B[sb])

(;B[sd];W[pb];B[pe];W[nd];B[pj])
)

(;B[qe];W[rb];B[pc];W[qb];B[pd];W[re];B[qf];W[pb];B[ob];W[oc];B[nd];
W[nc];B[mc];W[nb];B[mb];W[oa];B[md])
)
)
)

(;W[pe]
C[White 4 is not joseki, but there are many possible variations,
and the surrounding situation may be a factor.]
;B[pd];W[pf];B[nd];W[oc];B[nc];W[pb];B[nb];W[qb];B[ob];W[pc];B[rc];
W[rb];B[rf];W[rg];B[re]
C[White 'a' seals Black in on the right, and is the best White
can do. White 'b', Black 'a', and White still cannot make life.]
LB[sb:b][qg:a])

(;W[pd]C[Pushing your head against the wall is a basic mistake.])
)

(;B[mc]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

White responds with 'a *' to establish a group or 'b *' to seperate
Black.

White likes to have support in the lower right for 'b *'.

White 'c *' isn't good among ususal circumstances. Its purpose
is to prevent a Black moyo on the top side and occupy the triangled
position.

White 'd' was considered joseki a long time, but is now considered
an inferior variation..

White rarely ignores the pincer (variation 'e'). 

In some fuseki, the usual joseki are no help, and only 'f' is
correct.

'g' is inferior attempt to enforce a position on the outside.

White 'h', the outside attachment, is inferior.

e5, d4, c3, b2, a1

Outcomes:
a1 - Black choice of corner, top or right, plus trick plays
d4 - Black choice of top or right
c3 - Black choice of top or corner
b2 - Black corner & choice of top or left
e5 - Black choice of top or right
h - Black large corner, White right
]
LB[qe:h][pd:g][pf:f][dp:e][ne:d][md:c][ob:b][qc:a]TR[jd]
(;W[qc]
C[The aim of White 4 is to settle the position promptly, but Black
may have other plans.

Black responds with 'a *', 'b' or 'c *'.

Black 'a' aims for the top side although other results are possible,
too. It also offers some fine trick plays for Black.

Black 'b' does settle the position, with Black taking the right,
White out to the center toward the top (but with Black aji from
the pincer).

Black 'c' is similar to 'a' in the type of results and difficulty.
As it offers a chance for a mistake for weak players, it is traditionally
regarded as a trick play, although that is not a much important
point about it. Black must have the ladder to play this way.

Black 'd' is at best a special strategy, but not joseki.]
LB[jc:d][pd:c][rc:b][pc:a]
(;B[pc];W[pd]
C[Black 'a *' is joseki. 

Black 'b' is a trick play, but Black comes out well from it even
if White is not tricked.]
LB[qb:b][oc:a]
(;B[oc];W[nc]
C[Black continues with 'a *' or 'b *'. 'c' is a trick play.]
LB[qb:c][nb:b][nd:a]
(;B[nd]
C[White continues with 'a *'. White 'b' is strange, and has numerous
variations.]
LB[qe:b][nb:a]
(;W[nb];B[qb];W[rc];B[ob]
C[White continues with 'a *' or 'b *'. White must have the ladder
to play 'b'.
White will choose 'a', if the right side is important, 'b', if
the top side is more interesting, 

'c' is a mistake.]
LB[ne:c][mb:b][qe:a]
(;W[qe]
C[Black continues with 'a *' or 'b'.
With 'a' he aims for the top side, with 'b' he tries to take
the right side, but cannot force White to give it.]
LB[rb:b][mb:a]
(;B[mb];W[ne];B[md]
C[
* GOOD VARIATION *

The sequence is joseki because White has sente.
White has no influence, because Black has continuations on 'A'
and 'B'.
White center continuations on 'C' or 'D' are more urgent than the endgame on E..
]
PL[2]LB[of:D][nf:C][ng:B][oe:A][rb:E]
(;B[oe];W[pe];B[of]
C[This move is sente. White must answer on 'A' or Black attacks
on 'B'.]
PL[2]LB[qf:B][qg:A]
(;W[qg])

(;B[qf]C[White defends on 'A' or Black kills on 'A'.]PL[2]LB[re:A]
(;W[re];B[pf])

(;B[re];W[rd];B[pf];W[qd];B[rf])
)
)

(;B[ng]
C[White can push into the center, because of his weakness on A.]
LB[oe:A])

(;W[nf])

(;W[of])
)

(;B[rb]
C[Black tries a forcing move.
White continues with 'a' to consent into Black's plan of furikawari
and trade the right for the top side.
For White to play 'b' is locally disadavantageous. On the other
hand, it is the only possibility to resist Black's strategy to
take the right side and give up the top side, and sente.]
LB[rd:b][oa:a]
(;W[oa];B[pb];W[mb];B[rd];W[re];B[sc];W[lc];B[pe];W[oe];B[pf];W[ne];
B[qg])

(;W[rd]C[White 14 is submissive and not joseki.];B[md]
C[This is not joseki, because White did not get a stone on the
triangled position.]
TR[ne])
)
)

(;W[mb]
C[White must have the ladder to play this way.

Black plays 'a *' if the ladder favors White, 'b' if Black has
the ladder (and the game is over).
'c' is a trick play.]
LB[ne:c][md:b][qe:a]
(;B[qe];W[pf];B[rb];W[lc]
C[Black continues with 'a *' or 'b *'. 'a' leads to fighting, while
'b' gives settled shapes.]
LB[pe:b][md:a]
(;B[md];W[ld]LB[mf:A][nf:B]C['A *' is correct, 'B' is a mistake.
]
(;B[mf]
C[White continues with 'a *' or 'b'. There is no real difference
between the two variations.]
LB[oa:b][pe:a]
(;W[pe];B[le];W[oa];B[pb];W[qf]
C['A *' is joseki, 'B' is a trick play.]LB[kb:B][rd:A]
(;B[rd];W[re];B[sc];W[jd];B[ke]
C['A *' is the usual variation for just creating a living group
in good shape. 'B' is a continuation with support in the upper
left corner.]
LB[id:B][hc:A]
(;W[hc]C[
* GOOD VARIATION *];B[pi];W[oh]
C[Later, A is a good point for White.]LB[nf:A])

(;AW[dc][de];W[id])
)

(;B[kb];W[lb];B[jd]C['A' is correct, 'B' is getting tricked.]
LB[re:B][sc:A]
(;W[sc];B[sb];W[re];B[kd]C['A' is correct, 'B' is wrong.]
LB[pa:B][na:A]
(;W[na];B[la];W[pa];B[kc];W[qa];B[ka];W[ra];B[ma];W[sa])

(;W[pa];B[na];W[ma];B[ra];W[na];B[kc])
)

(;W[re];B[sc];W[rd];B[kd]C[Neither 'A' nor 'B' work.]LB[na:B][sb:A]
(;W[sb];B[sa];W[pa];B[na];W[ma];B[kc];W[qa];B[ka];W[sd];B[la];W[sb];
B[na];W[ra];B[sa];W[ra])

(;W[na];B[la];W[pa];B[kc];W[qa];B[ra])
)
)
)

(;W[oa]AB[gn][in][kn][ep][fp][fq][gp][bn][co][do][dk][dl][dm][cc][dh]
AW[lp][jp][eo][en][em][el][gl][il][bo][bp][cp][dp][dq][eq][pq][po]
C[This variation is from Sakata Eio (White) against Fujisawa Shuko = Fujisawa Hideyuki
(Black) in the 4th game of the 1963 Meijin Title. The joseki
in the lower right is numbered with prefixed zeros.]
LB[en:013][fp:012][eo:011][do:010][dp:09][co:08][jp:07][gp:06][dq:05][fq:04][eq:03][ep:02][cp:01]
;B[pb];W[pe];B[le];W[qf];B[rd];W[re];B[sc];W[jd];B[ke];W[hd];B[pi];
W[oh];B[ph];W[og];B[qm];W[oi];B[pj];W[kh];B[if];W[ih];B[fc];W[gf];
B[hg];W[fh];B[gg];W[fg];B[ff];W[he];B[ji];W[ed];B[ef];W[dg];B[eg];
W[eh];B[cg];W[di];B[df];W[ch])
)

(;B[nf];W[pe];B[le];W[ke];B[lf];W[qf];B[rd];W[re];B[sc];W[kf];B[lg];
W[qj];B[kd];W[jd];B[lb];W[kc];B[kb];W[jb];B[ma])
)

(;B[pe];W[oe];B[of];W[ne];B[nf];W[me];B[pg]C[
* GOOD VARIATION *];
W[mf])
)

(;B[md]C[Black has the ladder and White has lost.];W[oa];B[pb];W[rb];
B[pe])

(;B[ne];W[oa];B[pb];W[qe];B[rb]C['A' is correct, 'B' is a mistake.]
LB[rd:B][lc:A]
(;W[lc];B[rd];W[re];B[sc];W[of];B[le];W[ic];B[mg];W[pi])

(;W[rd];B[lc];W[lb];B[kb];W[jb];B[kc];W[ka];B[la];W[ja];B[pa];W[ma];
B[na];W[la];B[ic];W[jc];B[jd];W[kd];B[ib];W[oa];B[ia])
)
)

(;W[ne];B[md];W[qe]
C[Black does not have to play on A, because White played 14 and
16 in the wrong order. Black gets sente, so this is not joseki.]
LB[qe:16][ne:14][mb:A])
)

(;W[qe]
C[White 10 is odd.

Black can keep things simple with 'a', though perhaps giving
White a slightly favorable result. Alternately, Black extends
at 'b'.]
LB[rd:b][nb:a]
(;B[nb]C[Black 11 is simple.];W[rd])

(;B[rd]C[White continues with 'a' or 'b'.]LB[qb:b][rc:a]
(;W[rc];B[nb]C[White 'a' or 'b' are possible continuations.]
LB[pe:b][re:a]
(;W[re]
C[Black 'a' or 'b' are possible continuations that improve Blacks
local position.]
LB[pe:b][oe:a])

(;W[pe]C[White 14 gives bad shape.])
)

(;W[qb];B[nb]
C[White continues with 'a'. White 'b' and 'c' are not recommended.]
LB[pf:c][qf:b][re:a]
(;W[re];B[ne];W[pe]
C[White 16 is the most solid continuation. The result favors Black.])

(;W[qf]C[White 14 gives terrible aji.];B[pe];W[oe];B[pf];W[of];B[pg])

(;W[pf]C[White 14 gives bad shape and leaves aji.])
)
)
)
)

(;B[nb]
C[White continues with 'a *'. White 'b' if the ladder doesn't work,
but that is not joseki.]
LB[nd:b][qe:a]
(;W[qe]C['A *' is joseki, 'B' is variation.]LB[nd:B][rd:A]
(;B[rd];W[nd]
C['A' keeps the top side and is usual, 'B' goes to the right and
is good for White locally.]
LB[re:B][pb:A]
(;B[pb];W[re];B[rc];W[md];B[lc];W[qj]C[
* GOOD VARIATION *])

(;B[re];W[mb];B[ob]C['A' with the ladder, 'B' without.]LB[lb:B][lc:A]
(;W[lc];B[qb];W[md])

(;W[lb];B[qb];W[ld])
)
)

(;B[nd];W[rd])
)

(;W[nd]
(;B[qe]C[White continues with 'a'. White 'b' is unreasonable.]
LB[qb:b][mb:a]
(;W[mb];B[ob];W[lb];B[qb];W[ld]
C[If White could catch Black 3 in a ladder, the ponnuki shape would
be an equal result. The geta is less favorable.])

(;W[qb]C[White 12 is a mistake. White cannot live in the corner.];
B[ob];W[rd];B[re];W[sc];B[rb]
C[Withe the tesuji of 17, White dies in the corner.])
)

(;B[pb]C[Black 11 is not recommended. White gets great thickness.];
W[qe];B[rd];W[md];B[lc];W[re];B[rc];W[pj])
)
)

(;B[qb]C['A' is correct, 'B' is getting tricked.]LB[rc:B][nd:A]
(;W[nd]C['A' or 'B'.]LB[nb:B][rc:A]
(;B[rc];W[mb])

(;B[nb];W[mb];B[ob];W[qe];B[rc];W[lc])
)

(;W[rc];B[nb];W[nd];B[qe];W[mb];B[ob];W[lc])
)
)

(;B[qb]
C[Black 7 is a trick play, but Black gets a reasonable result even
if White is not tricked.]
;W[rc]C[Black 'a' and 'b' are both possible.]LB[rd:b][qe:a]
(;B[qe]
C[White 'a' is correct. White takes the top, Black the corner and
right.

White 'b' is a mistake, and White 'c' only slightly better.]
LB[nc:c][oc:b][pb:a]
(;W[pb];B[oc]
C[White 'a' is correct. White 'b', grimly clinging to the corner,
is a mistake.]
LB[rb:b][nc:a]
(;W[nc];B[ob];W[nb];B[pa];W[md];B[oe];W[jd]
C[Black must play at 'a' later. Playing elsewhere ('b') results
in a "flower-viewing" two-step ko for White.]
LB[dp:b][rb:a]
(;B[rb]C[Black 19 is necessary.])

(;B[tt]
C[Black plays elsewhere. The Black corner stones can only live
by ko.]
;W[rb];B[ra];W[na];B[oa];W[sa];B[sb];W[sc]C[A ko ensues.])
)

(;W[rb]C[White 12 is a mistake.];B[ob];W[qa]
C[Black may try 'a' or 'b'. 

Black 'a' gives black two groups (right and top).

Black 'b' give thickness at the expense of the two Black stones
(1,9).]
LB[ne:b][nd:a]
(;B[nd];W[pf]C[ Black 'a' is tesuji. Black 'b' is a mistake.]
LB[pe:b][pg:a]
(;B[pg]C[White 'a' is correct. White 'b' is a mistake.]LB[qf:b][of:a]
(;W[of];B[qf])

(;W[qf]C[White 18 is a mistake.];B[pe];W[oe];B[of];W[ne];B[rf];W[nf];
B[og];W[md];B[nc];W[ld];B[lc];W[kd];B[kc];W[jd]
C[The loss of the two White stones (16,18) makes this a loss for
White.])
)

(;B[pe]C[Black 17 is no good.];W[oe];B[of];W[ne];B[pg];W[nf];B[og];
W[md];B[nc];W[ld];B[lc];W[kd];B[kc];W[jd]C[White can aim at 'a'.]
LB[rg:a])
)

(;B[ne];W[nd];B[md];W[oe];B[of];W[nf];B[me];W[pf];B[og];W[pe];B[pg];
W[qf];B[qg];W[rf])
)
)

(;W[oc]C[White 10 is a mistake.];B[pb];W[ob];B[rb];W[of];B[jc])

(;W[nc]C[White 10 is not recommended.];B[ob];W[nb];B[rb];W[md])
)

(;B[rd];W[pb];B[oc]
C[White 'a', clinging to the corner, is a mistake.

White best continue with 'b'.]
LB[nc:b][rb:a]
(;W[rb]C[White 12 is a mistake.];B[ob];W[qa];B[nd]
C[White 'a' is the best White can do.

White 'b' gets White sealed in (but White gets the corner), in
White gote.]
LB[qe:b][pf:a]
(;W[pf];B[qg];W[pg];B[qh];W[ph];B[qi]C[The result favors Black.])

(;W[qe]C[White 16 is a mistake.];B[re];W[qf];B[of];W[pe];B[qg];W[rf];
B[rg];W[se])
)

(;W[nc];B[ob];W[nb];B[pa];W[md];B[qf])
)
)
)

(;B[rc];W[pc]C['A' is the old, 'B' the new variation.]LB[qg:B][re:A]
(;B[re]
C[Joseki continues with White 'a'. 

White 'b' is a bit unreasonable.]
LB[pf:b][ne:a]
(;W[ne]
C[Black continues with 'a'. 

Black 'b' is not joseki, as Black is pressed down on the right.
'c' is wrong.]
LB[me:c][kd:b][pg:a]
(;B[pg];W[ld]C['A' is correct, 'B' is wrong.]LB[lc:B][kc:A]
(;B[kc]C['A' is correct, 'B' is also possible.]LB[jd:B][lc:A]
(;W[lc]C[Continuation.];B[lb]
C[White continues with 'a' or 'b'. White needs the ladder to capture
Black 11 to play 'b'.]
LB[mb:b][md:a]
(;W[md]C['A' is joseki, 'B' and 'C' are mistakes.]LB[mb:C][nc:B][kd:A]
(;B[kd];W[mb];B[kf]
C[Later, Black likes to play A and shut in the group, which is
not yet alive.]
PL[2]LB[kb:A];B[kb]PL[2];B[of]PL[2];B[mf]PL[2];B[nc]
C[The killing begins.];W[nb];B[ma]C[White is dead.])

(;B[nc];W[mb])

(;B[mb];W[je])
)

(;W[mb]
C[Fujisawa Hosai 9-dan invented this. If Black 'a', White 'b' and
'c', assuming White has the ladder. This way of playing is frightening.]
LB[jc:c][kb:b][nb:a])
)

(;W[jd];B[jc];W[id]C['A' is correct, 'B' is a mistake.]LB[hc:B][ic:A]
(;B[ic];W[hd]C['A' is correct, 'B' is a mistake.]LB[gc:B][hc:A]
(;B[hc];W[gd];B[fc])

(;B[gc];W[hc];B[hb];W[lc];B[lb];W[kd]C['A' or 'B'.]LB[fb:B][nb:A]
(;B[nb];W[gb];B[ib];W[fc])

(;B[fb];W[mb];B[kb];W[nb])
)
)

(;B[hc];W[ic]C[White needs the ladder.];B[ib];W[jb]C['A' or 'B'.]
LB[kb:B][hb:A]
(;B[hb];W[lc];B[kb];W[lb])

(;B[kb];W[hb];B[ja];W[gc])
)
)
)

(;B[lc];W[jd])
)

(;B[kd]C[Black 9 puts Black's right side stones under pressure.];W[qf]
;B[qg]
C[White continues with 'a' or 'b'. White 'b' starts local fighting.]
LB[rf:b][pg:a]
(;W[pg];B[rg];W[ph];B[qi];W[id])

(;W[rf];B[rg];W[se])
)

(;B[me];W[mf];B[le];W[qf];B[qg];W[pg];B[rg];W[qh];B[ph];W[pf];B[qi];
W[rf];B[rh];W[sf])
)

(;W[pf]
C[Black 'a' and 'b' are possible continuations.

White leaves himself open to be cut later.]
LB[qg:b][rb:a]
(;B[rb])

(;B[qg])
)
)

(;B[qg]
C['A' or 'B' are ok.
'C' is not recommended.
'D' is questionable.]
LB[re:D][ne:C][rb:B][me:A]
(;W[me]
C[White needs the ladder.
'A' is joseki, 'B' and 'C' are variations.
'C' takes 20 points of territory for a wall.]
LB[md:C][re:B][jc:A]
(;B[jc];W[re];B[rd];W[qe];B[pe];W[pd];B[se];W[pf]
C['A' if the ladder works for White. 'B' punishes if Black has
the ladder.]
LB[oe:B][rf:A]
(;B[rf];W[oe];B[qj])

(;B[oe];W[of];B[ne];W[nd];B[nf];W[ng];B[mf])
)

(;B[re]C['A' for territory, 'B' for influence.]LB[kd:B][lc:A]
(;W[lc];B[ld];W[md];B[kc];W[lb];B[kd];W[mb];B[gc])

(;W[kd]C['A' and 'B' lead to clear results, 'C' to a fight.]
LB[ne:C][kc:B][kb:A]
(;B[kb];W[of];B[ic];W[ph])

(;B[kc];W[jc];B[ld];W[le];B[jb];W[jd];B[ib];W[md];B[lc];W[nc];B[fc];
W[mb];B[lb];W[la];B[kb])

(;B[ne];W[nd];B[md];W[le];B[oe];W[nb];B[mb];W[pe]
C['A' is correct, 'B' is disadvantageous.]LB[pf:B][og:A]
(;B[og];W[pd];B[kb];W[pf]C[White threatens a ladder on A.]LB[of:A];
B[nh];W[mg];B[of];W[jb];B[nc];W[ob];B[jc];W[kc];B[ib];W[lb];B[ja];
W[la]C['A' is correct, other moves like 'B' are mistakes.]
LB[fc:B][pg:A]
(;B[pg];W[ie])

(;B[fc];W[pg];B[ph];W[qh]
C[The Black stone on the right have become weak now.])
)

(;B[pf];W[pd];B[qe];W[nc];B[kb];W[of];B[nf];W[og];B[ng];W[pg];B[qf];
W[nh];B[mg];W[jb])
)
)
)

(;B[md];W[le];B[kd];W[re];B[rd];W[qe]
(;B[pd];W[pe];B[oc];W[oe];B[ob];W[qj])

(;B[pe];W[pd];B[se];W[pf];B[rf];W[oe];B[qj])
)
)

(;W[rb];B[rd];W[ne];B[qj];W[ld];B[kc])

(;W[ne];B[jc];W[qh]
C[If Black has a stone in the lower right corner, he will always
get a good result.]
;B[ph];W[qi];B[pf];W[rb];B[pi];W[qk];B[pj];W[pk];B[qj];W[rj]
C['A', 'B' or 'C'.]LB[ok:C][ri:B][rk:A]
(;B[rk];W[rl];B[ri];W[sk];B[rh])

(;B[ri];W[rh];B[rk];W[si];B[rl];W[qm];B[rm];W[rg];B[rf];W[sg];B[qn];
W[og];B[pg];W[ok])

(;B[ok])
)

(;W[re];B[rd]C['A' or 'B'.]LB[qe:B][md:A]
(;W[md];B[ld];W[me];B[nc];W[qe];B[pe];W[pd]
C['A' is correct, 'B' is a mistake.]LB[se:B][oe:A]
(;B[oe];W[rb];B[qf];W[sc];B[nd];W[ne];B[og])

(;B[se];W[pf];B[rf];W[oe]
C[Black can one remove one weakness on either 'A' or 'B'.]
LB[kd:B][qi:A]
(;B[qi];W[jd])

(;B[kd];W[qi])
)
)

(;W[qe];B[pe];W[pd];B[qf];W[md]
C['A' is correct, 'B' is disadvantageous.]LB[lc:B][ld:A]
(;B[ld]C['A' or 'B'.]LB[me:B][lc:A]
(;W[lc];B[kc];W[lb];B[me];W[nd];B[kd];W[pf];B[oe];W[ne];B[of];W[nf];
B[pg];W[mb])

(;W[me];B[oe];W[lc];B[kc];W[lb];B[kd];W[mb]
C[Later, A is a good follow-up for Black.]LB[lf:A])
)

(;B[lc]C['A' is correct, 'B' leads to overconcentration.]
LB[oe:B][jd:A]
(;W[jd];B[ke];W[pf];B[oe];W[ne];B[of];W[kd];B[ld];W[le];B[lf];W[og];
B[pg];W[nf];B[pf];W[me];B[nc];W[nd];B[jb];W[hd];B[kf];W[ib];B[kb])

(;W[oe];B[pf];W[rb];B[rf];W[sc];B[se];W[nc];B[ld];W[me])
)
)
)
)
)

(;B[pd];W[pc];B[oc]
C[White 'a' is joseki. 

White 'b' and 'c' are not joseki. White 'b' is less good than
a similar variation after 'a' and the reason why Black 5 is traditionally
called trick play.

White 'c' gives Black an option to fight (at Black's advantage)
or settle (to Black's slight advantage) with Black in the corner
and on the right, White taking the top.]
LB[pd:5][oe:c][ob:b][rd:a]
(;W[rd]
C[Black 'a *' and 'c' give settled groups. Most outcomes after
'c' are slightly better for White.
Black 'b' starts a fight.]
LB[re:c][qe:b][oe:a]
(;B[oe];W[nd]C['A *' or 'B'.]LB[nc:B][ob:A]
(;B[ob];W[qf];B[pe];W[rb];B[me]C[
* GOOD VARIATION *])

(;B[nc]
C[White 'a' is joseki. White 'b' starts a fight (rather needlessly).]
LB[ne:b][re:a]
(;W[re]
C[Black plays 'a' if the ladder is unfavorable, 'b' if the ladder
works.
'c' is not recommended.]
LB[qf:c][ne:b][me:a]
(;B[me];W[pe];B[md])

(;B[ne])

(;B[qf]C[Black 13 is not recommended.];W[qg]
C[White 14 is a tesuji to get White out and up.

Black continues with 'a'. Black cannot resist with 'b'.]
(;B[pe];W[rf])

(;B[rf]C[Black 15 is unreasonable. 

White may play 'a' or 'b'.]
LB[qe:b][pe:a]
(;W[pe];B[qe];W[pf])

(;W[qe];B[pe];W[pf])
)
)
)

(;W[ne]C[Black 12 needlessly starts a fight.];B[re];W[rc];B[qe];W[of]
C[Black 'a' give Black top and right, White corner and center,
a complicated but equal result.

Black 'b' takes the corner (20 points) while giving White superior
thickness.]
LB[pb:b][qh:a]
(;B[qh];W[ob];B[nb];W[pa];B[jc])

(;B[pb];W[qb];B[ob];W[qg]
C[Black 'a' and 'b' lead to the same outcome.]LB[rg:b][sd:a]
(;B[sd];W[rf];B[sb];W[qf];B[sc];W[pe];B[se]
C[Black's territory is 20 points, but White has superior thickness.])

(;B[rg];W[rh];B[rf];W[qi];B[sb];W[qf];B[sd];W[pe];B[sc]
C[Same outcome as 'a': Black has 20 corner points, White superior
thickness.])
)
)
)
)

(;B[qe];W[re];B[qf];W[ob];B[nc];W[oe]C[The White stone takes flight.])

(;B[re]
C[White 'a' has various outcomes. 

White 'b' emphasizes the top, but gives Black great thickness
on the right.]
LB[qe:b][nc:a]
(;W[nc];B[ob];W[nb]C[Black 'a' is correct, 'b' a mistake.]
LB[oe:b][nd:a]
(;B[nd];W[oe];B[mb]
C[White 'a' takes the top favorably. White 'b' gives Black a choice
of top or right, but White still has a favorable result.]
LB[ne:b][qe:a]
(;W[qe]C[White is slightly better off.])

(;W[ne]
C[Black 'a' takes the corner, but gives White advantageous thickness.
Black 'b' takes the top with White at an advantage again.]
LB[na:b][rc:a]
(;B[rc];W[qe];B[sd];W[pe];B[rd];W[na];B[qb];W[md]
C[The result favors White.])

(;B[na];W[qe]C[Black still has the endgame attachment at the red dot.]
CR[qb])
)
)

(;B[oe];W[nd];B[rc]C[Black 3 is terribly weakened.])
)

(;W[qe];B[pe];W[oe];B[pf];W[nc];B[ob];W[nb];B[of]
C[White 'a' takes the right while giving Black thickness. White
'b' takes the corner, but White gets sealed in (bad for White).]
LB[rc:b][md:a]
(;W[md];B[rc];W[pb])

(;W[rc];B[nd];W[ne];B[md];W[pb];B[mf]
C[Black fences White in, which is terrible for White.])
)
)
)

(;W[ob]C[White 8 is getting tricked.];B[nc];W[rd];B[re];W[rc];B[qf]
C[This result is better for Black, because in the equal fighting
outcome after White 8 on 10, there is a White stone on 11 and
a Black stone on the triangled position, so White is not so much
enclosed, and Black has not so good shape.
This difference is the reason for Black 5 being considered a
trick play.

If White 'a', Black 'b'. Moving out White 2 only creates a burden
for White.]
LB[pd:5][rd:10][ob:8][re:11][pf:b][oe:a]TR[qe])

(;W[oe]
C[Black 'a' starts a fight at which Black has an advantage.

Black 'b' yields a settled result slightly to Black's favor;
Black has the corner and right, White the top.]
LB[rc:b][ob:a]
(;B[ob];W[rd];B[qe];W[re];B[qf];W[rb];B[pg];W[me];B[kd]
C[White faces a disadvantageous fight.])

(;B[rc];W[nc];B[ob];W[nb];B[qb];W[md];B[pf]
C[The result is rougly equal.])
)
)

(;B[jc]
C[Black 5 is not joseki.

White continues with 'a'. Black 'b' is a mistake.]
LB[rd:b][pd:a]
(;W[pd];B[qe]C[White 'a' makes good shape. White 'b' is a mistake.]
LB[rc:b][pb:a]
(;W[pb])

(;W[rc]
C[White 8 is a mistake, as Black profitably forces White in solid
shape.]
;B[ob];W[pb];B[oc];W[pc];B[pg])
)

(;W[rd]C[White 6 is wrong in this situation.];B[pc];W[pd];B[qe]
C[White has two weaknesses: 'a' and 'b'.]LB[rc:b][oc:a])
)
)

(;W[ob]C['A *' is usual. 'B' is possible.]LB[qg:B][pf:A]
(;B[pf];W[ne]C[Black continues with 'a *' or 'b *'.]LB[kd:b][qj:a]
(;B[qj];W[kc]C[
* GOOD VARIATION *])

(;B[kd]C[Oftenly, the move is better on A.]LB[jc:A];W[qh]
C[Black continues with 'A *' or 'B'.]LB[og:B][ph:A]
(;B[ph];W[pi];B[oh];W[qe]
C['A *' is the new joseki which grips the right side for some points
in the corner.
'B' is the old variation, after which the White stones on the
right may still be used..]
LB[pe:B][re:A]
(;B[re];W[pd];B[qi];W[rd];B[rf];W[qc];B[qj]
C[
* GOOD VARIATION *

Black 7 is also good on A.]LB[kd:7][jc:A])

(;B[pe];W[pd];B[re];W[qc];B[qf];W[rc]
C[Black continues with 'a', White with 'b'. With support in the
lower right, White can alos strenghen his stones on the right.]
LB[id:b][pk:a])
)

(;B[og]C[White continues with 'a' or 'b'.]LB[pj:b][qe:a]
(;W[qe];B[pe];W[pd];B[re];W[qc];B[qf];W[rc];B[pi])

(;W[pj];B[pc];W[oc];B[qb];W[mf])
)
)
)

(;B[qg]
C[If you are high-dan and know the follow-up. mail it to me please.])
)

(;W[md]
C[Black 'a *' is usual; 'b *' and 'c' are also possible. Black
must have the ladder to play 'c'.]
LB[nd:c][nc:b][ld:a]
(;B[ld]C['A *' is correct, 'B' is a silly mistake.]LB[lc:B][me:A]
(;W[me];B[nc];W[oc]
C[
* GOOD VARIATION *

This is the same position as the variation referred to by the 
numbers, look there for the continuations.]
LB[od:8][nc:7][me:6][ld:5][md:4][mc:3][oc:2][qd:1])

(;W[lc]
C['A' is a simple punishment, 'B' aims to start an advantageous
fight but that doesn't work..]
LB[nc:B][nd:A]
(;B[nd]C['A' or 'B' don't help.]LB[nc:B][me:A]
(;W[me]
C['A' takes much territory while Whuite's wall becomes too small
or crippled.
'B' is also possible.]
LB[ne:B][oc:A]
(;B[oc];W[ne];B[nc]C['A' or 'B' don't help.]LB[pd:B][kc:A]
(;W[kc];B[pf]
C[Unbalanced situation: Black's territory is more than White's
potential and influence.]
;W[pd]C[This continuation doesn't work.];B[pc]
C['A' or 'B' don't help.]LB[qc:B][qe:A]
(;W[qe]C['A' is correct, 'B' is a mistake.]LB[pe:B][re:A]
(;B[re];W[rd];B[qc]C['A' or 'B' give a bad result for White.]
LB[rf:B][pe:A]
(;W[pe];B[qf];W[oe];B[rf])

(;W[rf];B[qf];W[se];B[oe])
)

(;B[pe];W[oe];B[rd]C[White 16 leaves much aji for White.]LB[qe:16])
)

(;W[qc];B[qe];W[oe];B[qb])
)

(;W[pd];B[pc]C['A', 'B' or 'C' don't help.]LB[kc:C][pf:B][qe:A]
(;W[qe];B[qc]C['A' or 'B' don't help.]LB[pf:B][kc:A]
(;W[kc];B[qf];W[pe];B[re];W[pf];B[qg])

(;W[pf];B[kc])
)

(;W[pf];B[kc])

(;W[kc];B[pf];W[qe];B[re]C[Reversed order of moves.])
)
)

(;B[ne];W[nc];B[mb];W[oc];B[kc];W[le];B[kd];W[nf];B[qf];W[pe];B[qg];
W[nb];B[lb])
)

(;W[nc];B[me];W[mb];B[oc];W[md];B[ne];W[pc];B[ob];W[pd];B[pb];W[qc];
B[mc];W[dp]C[No ko threat in fuseki.];B[nb];W[qh];B[qb];W[rc];B[hc])
)

(;B[nc]C[Don't peep where you can cut.];W[nd];B[oc];W[pc];B[pd]
C['A' is correct and crates a huge wall for some territory.
'B' is a mistake leading to a disadvantageous fight.]
LB[qc:B][pb:A]
(;W[pb];B[lb];W[kc];B[kb];W[jc];B[jb];W[ic];B[le];W[ob];B[na];W[of];
B[rb];W[pe];B[qe];W[qf];B[rf];W[rg];B[re]C['A' or 'B'.]LB[qg:B][ib:A]
(;W[ib]C['A' is necessary, 'B' is a mistake.]LB[qg:B][nb:A]
(;B[nb];W[qg])

(;B[qg];W[nb];B[mb];W[ja];B[pf];W[oe];B[og];W[mf])
)

(;W[qg])
)

(;W[qc];B[lb];W[kc];B[pb];W[qb];B[pa];W[kb];B[la];W[qa];B[na];W[rd];
B[re];W[rc];B[qf];W[sb];B[le];W[nf];B[lg];W[nh];B[qi])
)
)
)

(;B[nc]C[White continues with 'a *'. White 'b' is a mistake.]
LB[nd:b][oc:a]
(;W[oc];B[nd]C[White 'a *' is joseki. White 'b' is unreasonable.]
LB[ne:b][pe:a]
(;W[pe]
C[Black 'a *' is joseki. Black 'b' is not; the outcomes are favorable
to White.

Black 'c' is a slow version of 'a'.

Black 'd' is not recommended.]
LB[rf:d][ne:c][qe:b][nf:a]
(;B[nf];W[qe]C[
* GOOD VARIATION *])

(;B[qe]C[Black 9 is not recommended.];W[ne]
C[Black may try 'a' to 'e'. 'a' and 'b' are miai for White.]
LB[pf:e][me:d][ld:c][qf:b][lc:a]
(;B[lc];W[qf])

(;B[qf];W[lc])

(;B[ld];W[me]C['a' and 'b' are miai for White.]LB[qf:b][lc:a];B[kc]
C[Black may also connect solidly at 'a'.]LB[lc:a];W[qf];B[rf];W[qg];
B[rg];W[qh])

(;B[me];W[ld]
C[The continuation depends on the ladder and strategic considerations.])

(;B[pf];W[lc])
)

(;B[ne]C[Black 9 is solid and a bit slow.];W[qe])

(;B[rf]C[Black 9 is not recommended.];W[ne];B[ld];W[me];B[jc];W[qg]
C[White 14 makes an ideal squeeze move. Black lives only by helping
White build thickness.])
)

(;W[ne]C[White 8 is an overplay.];B[oe];W[pe];B[of];W[pd];B[me];W[nf];
B[og])
)

(;W[nd]
C[White 6 gives away a lot of territory for thickness that is less
than wonderful.]
;B[oc];W[pd];B[pc];W[qe];B[ld])
)

(;B[nd]
C[Black must have the ladder to play this way.
'A' is correct, 'B' is wrong.]
LB[ne:B][nc:A]
(;W[nc];B[ne]
C[White continues with 'a' or 'b'. 'a' gives White the corner,
'b' gives White influence to the top.]
LB[lc:b][oc:a]
(;W[oc];B[lc];W[pe];B[le];W[qe])

(;W[lc]
C[Joseki continues with Black 'a'. Black 'b' has been used professionally.]
LB[mb:b][oc:a]
(;B[oc];W[mb];B[nb];W[mc];B[ob];W[mf];B[oe])

(;B[mb]
C[Black 9 was played by Takagawa Shukaku against Kitani Minoru
in the 1st Saikyo Title in March 1958.]
;W[oc];B[ld];W[me];B[mf];W[le];B[kd];W[lf];B[kc];W[pe];B[nf];W[lg];
B[nh];W[qe];B[mi];W[if];B[hd];W[ki];B[qg];W[nb];B[lb];W[re])
)
)

(;W[ne];B[nc];W[oc];B[oe];W[pe];B[of];W[pd];B[kc];W[me];B[pf];W[qe];
B[qf];W[re])
)
)

(;W[ne]
C[Black continues with 'a' to 'c' or 'e'. Black 'd', attempting
to connect underneath, does not work.

With Black 'a and 'b', outcomes vary depending on White's play.
Black 'b' is good to make a moyo with support in the upper left.

With Black 'c', Black takes the top, White the right.

With Black 'd', Black takes the corner, giving up on Black 3,
the pincer.

'f' is not recommended.]
LB[pc:f][pf:e][oc:d][kd:c][me:b][qg:a]
(;B[qg]C[White continues with 'a' or 'b'.]LB[ld:b][qc:a]
(;W[qc]
C[Once, 'a' was joseki and 'b' disadvantageous. But nowadays, 'b'
has a follow-up which proves White 4 to be disadvantageous.]
LB[ne:4][rc:b][pc:a]
(;B[pc];W[pd];B[oc];W[qe];B[rd];W[qf]LB[qb:A][rc:B]
C['A' is correct, 'B' is disadvantageous because of a ko possibility.
]
(;B[qb];W[re];B[rc];W[pg])

(;B[rc];W[pg];B[dp]C[Suppose Black plays elsewhere.];W[nc]
C[Later, White can aim for ko.];B[nb];W[md]
C[Black 'a' and 'b' result in ko, neither favorable to Black.]
LB[pb:b][lc:a]
(;B[lc]C[If Black 19, White gets a ko in the corner.];W[qb];B[pb];
W[pa];B[ob];W[rb];B[sb];W[ra]
C[If Black 'a', White 'b' makes ko. Cutting at 'c' is no good for
White as this becomes a double ko.]
LB[mb:c][re:b][oa:a])

(;B[pb];W[lc];B[mb]C[This is a great success for White.])
)
)

(;B[rc];W[pc]C['A' is correct, 'B' is disadvantageous.]LB[re:B][jc:A]
(;B[jc]LB[rb:B][re:A]
(;W[re];B[rd];W[qe];B[pe];W[pd];B[se];W[pf];B[rf];W[oe]
C[Now White has bad shape. White 4 is too narrow. That's why White
4 is considered inferior.]
LB[ne:4])

(;W[rb];B[qj])
)

(;B[re];W[ld]
C[When Black 5 was considered to be disadvantageous it was because
it too low in combination with the eye-shape of Black 1-7-9.
But it is not Black 5, but Black 9, which is the wrong move.]
LB[qg:5][re:9][qd:1][rc:7])
)
)

(;W[ld]
C[Joseki continues with Black 'a'. Black 'b' is also possible,
depending on the global situation.]
LB[pc:b][oc:a]
(;B[oc]C[White continues with 'A'.
'B' and 'C' are bad.]
LB[nc:C][pc:B][lc:A]
(;W[lc];B[pd]
C[The Black territory is not equaled by the influence that White
could get.])

(;W[pc];B[pd];W[nc];B[ob];W[nb];B[pb]
C[The triangle stone is now bad positioned.]TR[ld])

(;W[nc]C[White 8 is unreasonable.]PL[2];B[nb];W[pc];B[nd];W[pd];B[oe])
)

(;B[pc]
C[Takagawa introduced this play in the 1956 Honinbo title match.
In that match, White continued at 'a'. White 'b' is also possible.]
LB[lc:b][oc:a]
(;W[oc];B[ic])

(;W[lc];B[nb]
C[Black connects with 9, and threatens Black 'a' and 'b'. White
has no good answer to Black 9.]
LB[me:b][md:a])
)
)
)

(;B[me]
C[Black plays 5 to prevent White from pressing down on his pincer.];
W[mf]C['A' is the modern basic joseki, 'B' the old variation.]
LB[md:B][le:A]
(;B[le]
C['A' results in a fight, 'B' takes the corner for the top side,
'C' is good for Black.]
LB[nf:C][qf:B][nc:A]
(;W[nc];B[nf];W[of];B[ng];W[og];B[nh];W[oh];B[ni];W[mb];B[lb];W[lc];
B[md];W[kb];B[nb];W[la];B[oc];W[nd];B[pd];W[oe];B[ob];W[pj];B[qg])

(;W[qf];B[nf];W[of];B[ng];W[og];B[nh]
C['A' kills the corner, 'B' doesn't and is a little stronger on
the outside.]
LB[nc:B][pc:A]
(;W[pc];B[oh];W[qh])

(;W[nc];B[mb];W[pi]
C[
If you are high-dan and know the follow-up in the corner. mail
it to me please.])
)

(;W[nf];B[qg];W[kg];B[je])
)

(;B[md]
C[White continues with 'a' to take the right or 'b' to take the
corner and center.]
LB[pc:b][lf:a]
(;W[lf];B[oc]
C[The position is usually left like this for the time being. White's
continuations in the corner are 'a' and 'b'.]
LB[pc:b][pd:a];W[pd];B[pc];W[qe];B[rd];W[qg]
C[White may continue here.])

(;W[pc]
C[White 8 forestalls the connection Black was hoping for. Black
continues with 'a'. Black 'b' is submissive.]
LB[qc:b][lf:a]
(;B[lf];W[ng];B[qg];W[lg];B[kf];W[qc];B[qj])

(;B[qc]C[Black 9 is submissive];W[lf])
)
)
)

(;B[kd]
C[Black 5 is a trick play. White continues with 'a'. White must
not attach at 'b'.]
LB[qc:b][qf:a]
(;W[qf];B[pe];W[pf];B[oe];W[of];B[nd];W[rc]
C[White 12 is a tesuji to steal the corner. 

Black continues with 'a', possibly 'b'.

Black 'c' is a mistake. Black cannot prevent White from crossing
under.]
LB[rd:c][oc:b][me:a]
(;B[me];W[nf];B[oc];W[rd])

(;B[oc];W[rd])

(;B[rd]C[Black 13 is unreasonable.];W[pd]
C[White 14 kills the Black stones.])
)

(;W[qc]C[White has been tricked.];B[pc];W[pd];B[oc];W[qe];B[rd]
C[White continues with 'a' or 'b'.]LB[re:b][nc:a]
(;W[nc];B[nb];W[nd];B[pb];W[re];B[rc];W[qi]
C[White's moves appear reasonable, but compare the result to the 
outcome of the variation referenced by the numbers.]
LB[nb:9][nc:8][oc:7][pd:6][pc:5][qc:4][mc:3][od:2][qd:1])

(;W[re];B[rc])
)
)

(;B[oc]
C[Black 5 attempts to connect underneath, to no avail.

White continues with the sacrifice of 'a'.
White 'b' is premature (the sacrifice of 'a' is prerequisite).
White 'c' is passive.]
LB[pd:c][nc:b][pc:a]
(;W[pc]C[White 6 is a sacrifice to separate Black 3 from 5.];B[pd];
W[nc];B[ob];W[nb];B[pb];W[pe];B[qe];W[pf];B[qg])

(;W[nc]C[White 6 is out of sequence.];B[pc];W[nb];B[md];W[nd];B[qg])

(;W[pd]
C[White 6 gives Black the corner and lets Black stay connected.];B[pc]
;W[qe];B[rd])
)

(;B[pf];W[qc];B[rc];W[pc];B[re]
C[Now, this is the same position like White 6, Black 7, White 8
and Black 9 being played before White 4 and Black 5, look there
for continuations.]
LB[pf:5][ne:4][pc:8][qc:6][re:9][rc:7])

(;B[pc];W[ld];B[nb];W[kf])
)

(;W[tt]C[White plays elsewhere. 

Black continues with 'a' to 'c'.]
LB[me:c][pf:b][oc:a]
(;B[oc];W[nd];B[nc];W[pd];B[pc];W[qe];B[rd])

(;B[pf];W[ne];B[pc];W[oc])

(;B[me])
)

(;W[pf]
C[This move is correct, if
a) there's an additional Black stone on the squared position,
b) there are additional White stones on the triangled positions.]
TR[pp][jj]MA[jc];B[oc]C['A' or 'B' are ok.]LB[nd:B][pd:A]
(;W[pd];B[pc];W[qe];B[rd];W[nd])

(;W[nd];B[pc];W[qe];B[pd];W[nf])
)

(;W[pd];B[qc];W[qe];B[re];W[qf];B[rf];W[qg];B[ob])

(;W[qe]
C[White 4 with this pincer gives White an inferior result: each
players gets a side, but Black gets the whole corner territory.

Black continues with 'a'. Black 'b' and 'c' are mistakes.]
LB[pe:c][re:b][pd:a]
(;B[pd]C[Sometimes the simple move is the best.];W[pe];B[oc];W[oe];
B[nd];W[ne];B[me];W[mf];B[lf];W[le];B[md];W[mg];B[kf];W[pk])

(;B[re]C[Black 5 is passive.];W[pe];B[rf];W[qc];B[rd];W[oc])

(;B[pe]
C[Black 5 starts a complex battle that Black has no way to win.];W[pd]
;B[qf];W[re];B[qc];W[rf];B[oe];W[nd])
)
)

(;B[lc]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

If you are high-dan and know the follow-up. mail it to me please: kogo@waterfire.us.

White continues with 'A', 'B', 'C' or 'D'. 
White needs the ladder for 'B'.
'E', 'F', 'G' and 'H' are mistakes.
If White plays tenuki 'I', Black has no good follow-up.
]
LB[mc:H][ld:G][md:F][qe:E][qc:D][pf:C][pg:B][of:A][dp:I]
(;W[of];B[qf]
C[To keep the pseudo-pincer weak, White must make Black react against
'A' on the right, not settling Black without settling himself
by playing 'B'.]
LB[qc:B][oh:A]
(;W[oh];B[qh];W[ic]
C[In contrast to Black 3 being on A or B, Black 3 is one line slower
on his escape route.
So Black 3 is not ideally positioned.]
PL[2]LB[lc:3][md:B][ld:A])

(;W[qc];B[rc];W[pc];B[re];W[jc];B[le])
)

(;W[pg]C['A' good for W
'B' good for W, W needs ladder]LB[pd:B][oe:A]
(;B[oe];W[ne]C['A', 'B' good for W]LB[pd:B][of:A]
(;B[of];W[pd];B[qf];W[nf];B[og];W[qc];B[qe];W[rc]
C[In contrast to Black 3 being on A, White doesn't need the ladder
for this move, so Black 3 is bad positioned.]
LB[lc:3][ld:A];B[nd]C[The cut doesn't work now.];W[md];B[nc];W[mc];
B[ob];W[oc];B[nb];W[mb];B[pb];W[pc];B[me]
C[All Black attempts to rescue his stones fail.];W[mg];B[le];W[ld];
B[ke];W[kc];B[mh];W[lg];B[ng];W[mf];B[kh];W[lh];B[li];W[mi];B[nh];
W[ki];B[lj];W[kg];B[jh];W[jg];B[ig];W[ih];B[ji];W[if];B[hg];W[je])

(;B[pd];W[of];B[oc];W[pe];B[nc]C[Black 3 is now too near.]LB[lc:3])
)

(;B[pd];W[oe];B[oc];W[nc];B[nd]
C['A' good for W, ladder
'B' mistake, good for B]LB[pc:B][md:A]
(;W[md]
C[If Black 3 was on A, it would be a ladder breaker, so it is bad
positioned, and Black ends up low.]
LB[lc:3][ld:A];B[nb];W[ne];B[ob])

(;W[pc];B[ob];W[pb];B[nb];W[rc];B[qc];W[qb];B[rb];W[ra];B[sb];W[sc];
B[pa];W[sa];B[rb];W[sb];B[oa];W[rd];B[qa];W[qe];B[rb];W[qb])
)
)

(;W[pf]C['A' is correct, 'B' good for W]LB[oe:B][oc:A]
(;B[oc];W[nc];B[pc];W[nd];B[rf])

(;B[oe];W[pe];B[pd];W[nd];B[og];W[me];B[of];W[re];B[ob];W[rd];B[rc];
W[qh];B[mc]C[Black 3 is now too narrow.]LB[lc:3])
)

(;W[qc]C['A' correct
'B' mistake]LB[pc:B][rc:A]
(;B[rc]C['A', 'B' good for B]LB[rb:B][pc:A]
(;W[pc];B[re]C['A' is ok, 'B' is also possible.]LB[pf:B][of:A]
(;W[of];B[qg];W[jc];B[le];W[je];B[lg];W[oh]
C[White has two unsettled groups, Black only one.])

(;W[pf];B[qg];W[pg];B[qh];W[jc])
)

(;W[rb];B[pc];W[qb];B[pb];W[rd];B[re];W[sc];B[pd];W[of];B[le])
)

(;B[pc];W[pd];B[oc];W[nc]C['A', 'B' good for W]LB[nb:B][nd:A]
(;B[nd];W[ne];B[md];W[ob])

(;B[nb]C['A' good for W
'B', 'C' mistakes, good for B]
LB[mb:C][nd:B][qb:A]
(;W[qb];B[nd];W[qe]C['A', 'B' good for W]LB[ne:B][mc:A]
(;B[mc];W[of])

(;B[ne];W[mc];B[mb];W[ob];B[md];W[nc])
)

(;W[nd];B[qb]C['A', 'B' good for B]LB[mb:B][rc:A]
(;W[rc];B[rd];W[rb];B[pb])

(;W[mb];B[ob];W[rc];B[rd];W[rb];B[ra])
)

(;W[mb];B[mc];W[nd];B[ob])
)
)
)

(;W[qe];B[re];W[pe];B[rf];W[qc]C['A', 'B' good for B]LB[rd:B][rc:A]
(;B[rc];W[pd];B[rd];W[qb];B[qh])

(;B[rd];W[pc];B[pg];W[rc];B[ic])
)

(;W[md];B[nb];W[ld];B[kc]C['A', 'B' good for B]LB[pc:B][qe:A]
(;W[qe]C['A', 'B' good for B]LB[pd:B][pc:A]
(;B[pc];W[pe];B[pj])

(;B[pd];W[pe];B[oc];W[nc];B[ob];W[oe];B[pj])
)

(;W[pc];B[qg])
)

(;W[ld];B[mc])

(;W[mc];B[ld];W[qc];B[rc];W[pc];B[qg])

(;W[tt];B[pf]C[White tenukis agains.
];W[tt];B[ne]
C[White is still not completely dead.
];W[md];B[nd];W[mc]
C[Whtie can enlargen an already existing territory on the top side.
])
)

(;B[kc]
C[
Sangen Basami = Sekan Hyeopgong = San Jia = 3-Space Low Pincer
---------------------------------------------------------------

If you are high-dan and know the follow-up. mail it to me please: kogo@waterfire.us.

'A', 'B' or 'C'. 'D' is disadvantageous.
]
LB[pf:D][qc:C][qe:B][of:A]
(;W[of]C['A' or tenuki 'B'.]LB[dp:B][qf:A]
(;B[qf];W[oh];B[qh];W[qc];B[rc];W[ic];B[ke];W[kg])

(;B[dp];W[qf];B[rf];W[rg];B[re];W[qg];B[pc];W[oc])
)

(;W[qe];B[re];W[pe];B[rf];W[qc];B[rd];W[pc];B[qi];W[mc])

(;W[qc];B[dp];W[pd];B[qe];W[pb];B[qh])

(;W[pf];B[oe];W[pe];B[pd]C['A' or 'B'.]LB[oc:B][ne:A]
(;W[ne];B[oc];W[of];B[nc])

(;W[oc];B[ne];W[qb];B[rf];W[rg];B[re];W[qg];B[rb];W[pb];B[rc];W[md];
B[ng])
)
)

(;B[md]
C[
Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia = 2-Space High Pincer
----------------------------------------------------------------------------

White responds with 'a *', 'b *' or 'c'. White 'd' is wrong. White
'e' is a mistake.

outcomes
White 'a' = White top, Black right
White 'b' = White corner, Black right
White 'c' = White top and aji on the right, Black between corner and center.
White 'e' = White thickness, Black corner + favorable result
]
LB[qc:b][of:a][pg:c][qe:d][pf:e]
(;W[of]
C[Black continues with 'a *'. Black 'b', attempting to connect
underneath, is vulgar.]
LB[oc:b][qf:a]
(;B[qf];W[qc]C['A *' is joseki, 'B' is a mistake.]LB[pc:B][rc:A]
(;B[rc]
C['A *' is correct, 'B' is possible to settle White immediatley.]
LB[pc:B][jd:A]
(;W[jd]
C[
* GOOD VARIATION *

Later, White plays 'A' or, if the fight in the middle has become
less important than making points in the corner, 'B'.
Black 'A' is gote.]
PL[2]LB[rb:B][pc:A]
(;W[pc])

(;W[rb]C['A' or 'B'.]LB[pc:B][rd:A]
(;B[rd];W[pc])

(;B[pc];W[qb];B[pd];W[rd];B[re];W[sc])
)

(;B[pc];W[oc]C['A' is necesary, tenuki 'B' is not recommended.]
LB[dp:B][qb:A]
(;B[qb])

(;B[dp];W[qb];B[pd];W[pb])
)
)

(;W[pc]C['A' or 'B' are ok.]LB[re:B][rb:A]
(;B[rb]
C['A' if the White group needs immediate life, 'B' to attack the
pincer.]
LB[jd:B][mc:A]
(;W[mc];B[lc];W[ld];B[kc];W[me];B[kd];W[nd])

(;W[jd])
)

(;B[re]C['A is correct, 'B' is a mistake.]LB[kd:B][mc:A]
(;W[mc];B[lc];W[ld]C['A' or 'B' are ok.]LB[kc:B][mb:A]
(;B[mb];W[nc];B[kc]C['A' or 'B'.]LB[me:B][le:A]
(;W[le];B[kd];W[lf])

(;W[me];B[kd];W[nd];B[gc])
)

(;B[kc];W[me];B[kd];W[nd];B[gc])
)

(;W[kd];B[le]C[White has two unsettled groups, Black only one.])
)
)
)

(;B[pc];W[pd];B[qb];W[rc]LB[pe:B][rd:A]
(;B[rd];W[pb];B[oc];W[rb];B[nc];W[qg])

(;B[pe];W[oe];B[rb];W[oc];B[pb];W[qg];B[rd];W[rf])
)
)

(;B[oc]
C[Black 5 is a mistake.

White continues with 'a'. White 'b' is not recommended.]
LB[pc:b][nc:a]
(;W[nc];B[nd];W[pc]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[ob:b][pd:a]
(;B[pd]C[White continues with 'a'. White 'b' is not recommended.]
LB[oe:b][ob:a]
(;W[ob];B[oe];W[oc];B[pe];W[ne])

(;W[oe]C[White 10 is not recommended.];B[ob];W[nb];B[pb];W[lc];B[ld];
W[kc];B[kd];W[jc];B[mg])
)

(;B[ob]C[Black 9 is unreasonable.];W[pd];B[nb];W[qe]
C[White has superior position.])
)

(;W[pc]C[White 6 is not recommended.];B[pd];W[nc]C['A' or 'B'.]
LB[oe:B][ob:A]
(;B[ob];W[nd];B[pb]
C[White's outside shape is okay, but Black has a better position,
and profit in the large corner.])

(;B[oe];W[ob];B[nd];W[oc];B[ne];W[qf];B[pe];W[lc])
)
)
)

(;W[qc]C['A *' or 'B'.]LB[pc:B][pd:A]
(;B[pd];W[pc];B[oe];W[oc];B[pf]
C[White continues with 'a *', possibly 'b *'.]LB[ne:b][mb:a]
(;W[mb];B[ne]C[
* GOOD VARIATION *])

(;W[ne]
C[White 10 creates a center group, as Black cuts 10 off from the
White corner group. White must want that result for White 10
to be considered a reasonable play.]
;B[nd];W[nf]
C[This is the same position as in the variation referred by the 
numbers, see there for the continuations.]
LB[oe:11][od:10][nd:9][pc:8][pd:7][qc:6][pf:5][ne:4][md:3][oc:2][qd:1][nf:12])
)

(;B[pc];W[pd];B[qb];W[rc]C['A' is better than 'B'.]LB[rd:B][qe:A]
(;B[qe]
C['A' runs or fights outside, 'B' lives enclosed in the corner.]
LB[pb:B][oc:A]
(;W[oc];B[pb];W[ob];B[rb];W[of])

(;W[pb];B[oc]C['A' is ok, 'B' is wrong.]LB[rb:B][ob:A]
(;W[ob];B[nc];W[rb];B[nf])

(;W[rb];B[ob];W[qa];B[ne])
)
)

(;B[rd];W[pb];B[oc];W[nc];B[ob];W[nb];B[pa];W[nd])
)
)

(;W[pg]C['A' is correct, 'B' disadvantageous.
]LB[pd:A][oe:B]
(;B[pd]LB[oe:A][oc:B]C['A' is correct, 'B' wrong.
]
(;W[oe];B[oc];W[nc];B[nd];W[nb];B[pc];W[lc];B[of]LB[ic:A]
C[White plays tenuki or 'A',
];W[ic];B[ne]
C[Later, White can develop a position on the right side.
])

(;W[oc];B[oe];W[ne];B[of];W[nd]
C[White 10 is necessary, but makes White heavy.])
)

(;B[oe]
C[The sacrifice play of Black 5 is not as good as the alternative 
of Black 5 onto the marked point.]
MA[pd];W[ne];B[nd];W[pe];B[pd];W[of];B[oc]
C[Black gets a big corner, but White has decent outside shape.
Black has less territory than the similar joseki after Black 3 on the triangled position.
]
LB[md:3]TR[ld])
)

(;W[qe]
C[Black punishes on 'a'.
Black 'b' is too mild. 
Black 'c' is goes for influence.
]
LB[pe:c][re:b][pd:a]
(;B[pd];W[pe]
C['B' takes the top side, 'A'aims for the right side and can be difficult.
]
LB[oe:A][oc:B]
(;B[oe]C['A' is necessary, 'B' fails.
]LB[ne:A][oc:B]
(;W[ne];B[of];W[nd];B[re];W[qf];B[qg];W[rf];B[rd]
C[White now has to crawl along the second line to live (if he can),
beginning with 'a'. The result is a disaster for White.]
LB[rg:a])

(;W[oc];B[re];W[rf];B[rd];W[qg];B[of]LB[pg:A][pb:B]
C[White 'A' or 'B'.
]
(;W[pg];B[pb];W[ob];B[mb];W[qb];B[pc];W[pa];B[rb];W[ra];B[rc];W[se];
B[nd];W[sd];B[sb];W[sf];B[nb];W[sc];B[nc];W[oa];B[na];W[qa];B[pf];
W[qf])

(;W[pb];B[pg];W[qf];B[qi];W[ph];B[oh];W[rj]LB[qh:A][ri:B]
C[White has a tesuji to connect on the right side if somewhere on the 3rd line of the right side, there's a White stone.
'A' presses White down, 'B' lets White out.
]
(;B[qh];W[rh];B[ri];W[si];B[qj];W[rk];B[sg]
C[Black lives in the corner.
])

(;B[ri];W[pi];B[qj];W[qh])
)
)
)

(;B[oc]C[Black creates a large corner.
'A' is better than 'B'.]
LB[oe:B][nc:A]
(;W[nc]C[White 8 creates aji.];B[nd];W[oe];B[pc];W[pi])

(;W[oe];B[nc])
)
)

(;B[re]
C[Black 5 is a mistake; a lost opportunity for Black to punish White for an unreasonable move.
]
;W[pe];B[rf];W[qc];B[rd];W[oc])

(;B[pe]C[Black 'c' aims for influence and misses to punish.
];W[pd];
B[qf];W[re];B[qc];W[rf]C[Black sacrifices the corner for the outside.]
;B[oe]LB[pb:A][ne:B]C['A' takes the corner, 'B' is wrong.
]
(;W[pb];B[qb];W[rd];B[qg];W[pc])

(;W[ne];B[pg]LB[rg:A][nd:B][qg:C]C['A' and 'B' are miai, 'C' is bad.
]
(;W[rg];B[nd])

(;W[nd];B[rg])

(;W[qg];B[nd];W[pf];B[of];W[og];B[nf];W[ph];B[lf]
C[Black has much more points.
])
)
)
)

(;W[pf]
C[White 4 is a mistake.

Black continues with a sacrifice at 'a'. White 'b' is not recommended.]
LB[qf:b][oe:a]
(;B[oe]C[Black 5 is a sacrifice play.];W[pe];B[pd]
C[White may try 'a' or 'b'.]LB[oc:b][ne:a]
(;W[ne];B[oc];W[of];B[nd])

(;W[oc]
C[White 8 resists the outcome of the variation of White 8 onto 
the marked point, but a difficult fight starts.]
MA[ne];B[of];W[pg];B[pc]
C[If you are high-dan and know the follow-up. mail it to me please: kogo@waterfire.us.
])
)

(;B[qf]C[Black 5 makes White 4 a successful move.];W[pg];B[qg]
C[Black 5 & 7 help secure the corner at the expense of the top.];W[ph]
C[The pincer of Black 3 has lost its value.])
)
)

(;B[ld]
C[
Nikken Takabasami = Dukan Nop'dahyeopgong =  E`r Gaojia = 2-Space High Pincer
------------------------------------------------------------------------------

Black 3 is a relatively modern invention. It is a severe move
which restricts White's movements.
It's also a punishment if White 2 was wrong because Black has additional stone on the triangled position like in the Kobayashi Fuseki.

White responds with 'a *', 'b *', 'c *' or 'd' (joseki).
One of the variations after 'c' is called "the magic sword of
Muramasa". Although its joseki are not difficult, its mistake
refutations are hair-raising.
White 'd' was considered inferior until a new joseki variation
was developed.

White 'e' is unfavorable with this pincer, as the pincer is in
the way of White's extension.

Var 5 ('f') shows White playing elsewhere (which is rare).

'g' is not recommended.

'h' is inferior.

'i' is a special strategy, if White has something like the High
Chinese Fuseki on the lower side..

g7, f6, e5, d4, c3, b2, a1

joseki outcomes:
a1 - Black right, White top
b2 - Black choice of right or top
c3 - Black choice or right or top
d6 - Black top, White right, each side has a group on the run
e4 - Black right
f5 - Black right
g7 - Black right; White top (not good for White)
]
LB[qe:c][pg:b][of:a][pf:d][qc:e][dp:f][pd:g][og:h][ph:i]TR[pj]
(;W[of]C[Black continues with 'a *' or 'b'.
'c' is impossible.]
LB[qg:b][qf:a][pg:c]
(;B[qf]C['A *' is joseki, 'B' is possible.]LB[qc:B][oh:A]
(;W[oh]LB[qh:A][pg:B]TR[pj]
C['A *' is usual. If there is already an additional Black stone on the triangled position like in the Kobayashi Fuseki, White 2 wrong and Black punishes on 'B'.
]
(;B[qh];W[id]C[
* GOOD VARIATION *])

(;AW[dp][pp][nq]AB[dd][pj][qn];B[pg])
)

(;W[qc];B[rc]C['A' is correct, 'B' is too early.]LB[pc:B][oh:A]
(;W[oh];B[qh];W[id]
C[Later, White can choose to play 'A' or, if the fight in the middle
has become less important than making points in the corner, 'B'.
Black 'A' is gote.]
PL[2]LB[rb:B][pc:A]
(;W[pc])

(;W[rb]C['A' or 'B'.]PL[2]LB[rd:B][pc:A]
(;B[pc];W[qb];B[pd];W[rd];B[re];W[sc])

(;B[rd];W[pc])
)

(;B[pc];W[oc]
C[Black must capture on 'A', tenuki 'B' is not recommended.]
LB[dp:B][qb:A]
(;B[qb])

(;B[dp];W[qb];B[pd];W[pb])
)
)

(;W[pc];B[rb])
)
)

(;B[qg]C['A' is correct, 'B' is wrong. 'C' is possible.]
LB[qc:C][ph:B][oh:A]
(;W[oh];B[pi];W[id])

(;W[ph];B[pg];W[og];B[oh];W[pj];B[nh];W[qh];B[rh];W[ri];B[rg];W[mf])

(;W[qc];B[rc];W[pc]C['A' or 'B'.]LB[rb:B][re:A]
(;B[re])

(;B[rb];W[qf];B[rf];W[qe];B[re];W[pd];B[rd];W[pg];B[qh])
)
)

(;B[pg];W[qe];B[pe];W[pf];B[qf];W[re])
)

(;W[pg]
C[White 4 was invented by Fujisawa Kuranosuke (Hosai) in a jubango
against Wu Qingyuan = Go Seigen in 1952.

Black continues with 'a *', 'b *' or 'c'. Black 'c' is still
somewhat experimental.

'd' is difficult to answer.
'e' is possible.
'f' is not recommended.]
LB[oc:f][qf:e][pf:d][of:c][pd:b][oe:a]
(;B[oe]
C[White continues in joseki with 'a *'. 

White 'b' and 'c' are mistakes.]
LB[pd:c][pe:b][ne:a]
(;W[ne]
C[Black continues with 'a *', the main joseki, or 'b', a more recent
innovation.
Black 'c' is slow, and not recommended.]
LB[pe:c][pd:b][of:a]
(;B[of]
C['A *' makes a small group on the side which still can push outside.
'B *' takes a larger White group on the side and gives Black
a wall.]
LB[qc:B][pd:A]
(;W[pd]C[Black continues with 'A *', 'B *' or 'C'.]
LB[qe:C][pe:B][qf:A]
(;B[qf]
C[White continues with 'A *'. 'B' is inferior. White 'C' used to
be considered vulgar, but opinion may be changing.]
LB[pe:C][nf:B][qc:A]
(;W[qc]
C[White is testing, if Black reacts on 'A *' or 'B'. 'B' is better if Black is strong, because it allows to attack White better.
]
LB[rd:B][qe:A]
(;B[qe]
C[Now that Black played Black 11 this way, White continues with 'A *'.
'B' is also possible. White 'C' and 'D' are not recommended.
'C' was considered joseki before being replaced by 'A *'.
]
LB[qe:11][md:D][nc:C][le:B][nf:A]
(;W[nf]C['A' is correct. 'B' is a mistake.]LB[nd:B][og:A]
(;B[og]
C['A *' is easy.
'B' is possible if White has the ladder and there's no Black
stone on the triangled position.]
LB[rc:B][pb:A]TR[pj]
(;W[pb]
C[
* GOOD VARIATION *

Later, Black can easily use Black 3 to create territory on the
top side, because Black A or B are sente. Black can also later
play 'C'.
In some fuseki, Black can try the ambitious move of 'D'.
Later, the correct endgame for White in the corner, is 'E', not F,
because if he playes on F the result is the same as if Black plays in sente on E.
]
PL[2]LB[ng:C][ld:3][mc:B][lc:A][lg:D][rd:E][rc:F]
(;B[ng]C['A' is correct, 'B' is a mistake.]LB[lf:B][le:A]
(;W[le];B[ke])

(;W[lf];B[nd];W[md];B[me];W[nc];B[mf];W[le];B[nd];W[ne];B[kd])
)

(;AW[dd]AB[ch][ql]PL[1];B[lg];W[ng];B[fc];W[cf];B[fe];W[oh];B[ph];
W[pi];B[qh])

(;W[rd];B[re];W[rc])
)

(;W[rc]C['A' is usual. 'B' starts the ladder.]LB[nd:B][pj:A]
(;B[pj]C['A' is correct, tenuki 'B' is a mistake.]LB[dp:B][nc:A]
(;W[nc])

(;W[dp];B[nd];W[md];B[nc];W[mc];B[ob];W[oc];B[nb];W[mb];B[pb];W[pc];
B[me];W[kb];B[kc];W[lb];B[lg];W[mg];B[mf];W[ng];B[mh];W[nh];B[ni];
W[oh];B[ph];W[oi];B[oj];W[pi];B[qi])
)

(;B[nd];W[md];B[nc];W[mc];B[ob]LB[oc:A][nb:B]
C['A' is correct, 'B' is a trick move.
]
(;W[oc];B[nb];W[mb];B[pb];W[pc]C['A' or 'B'.]LB[qb:B][me:A]
(;B[me];W[kb]LB[kc:A][jb:B]
C['A' is correct, 'B' is a disadvantageous trick move.
]
(;B[kc];W[lb];B[lg];W[mg];B[mf];W[ng];B[nh];W[mh];B[mi])

(;B[jb];W[lb]C[Refusal of the trick.
])
)

(;B[qb];W[rb];B[me]C['A' ladder, 'B' mistake.]LB[kc:B][kb:A]
(;W[kb]LB[kc:A][jb:B]
C['A' is correct, 'B' is a disadavantageous trick play.
]
(;B[kc];W[lb]LB[mf:A][lg:B]
C[Black can start the ladder on 'A' or 'B'. If he wants to guide the ladder to the right side, he must play 'B'.
]
(;B[mf];W[ng];B[nh];W[mg];B[lg];W[mh];B[mi])

(;B[lg];W[mg];B[mf];W[ng]TR[pj]LB[nh:A][mh:B]
C['A' guides the ladder to the lower left. 'B' turns the the ladder to the right, if there's a Black stone on the triangled position.
]
(;B[nh];W[mh];B[mi];W[lh];B[kh])

(;AB[pj];B[mh];W[nh];B[ni];W[oh];B[ph];W[oi];B[oj];W[pi];B[qi])
)
)

(;B[jb];W[lb]C[Refusal of the trick.
])
)

(;W[kc];B[ma]C['A' is necessary, 'B' fails.]LB[la:B][lb:A]
(;W[lb];B[ra];W[na];B[rd];W[oa];B[pe];W[sb];B[sd];W[la];B[sc])

(;W[la];B[lc];W[lb];B[kb];W[na];B[ka])
)
)
)

(;W[nb];B[oc];W[pc];B[mb]LB[na:A][lb:B]
C['A' is correct. 'B' -> White corner dies.
]
(;W[na];B[lc];W[me];B[ma];W[lb];B[oa];W[kb]LB[jb:A][jc:B]
C['A' refuses the trick, 'B' doesn't.
]
(;B[jb];W[jc];B[ib]
(;W[kc];B[ra];W[rd];B[re];W[pb];B[pa];W[qa];B[qb];W[rb];B[qa];W[sa];
B[sb];W[sc];B[pe];W[sa]C[3-move-approach ko for White.
])

(;W[le];B[ka];W[kc];B[la])
)

(;B[jc];W[jb]LB[ic:A][ib:B]C['A' or 'B' don't work.
]
(;B[ic];W[pb];B[ib];W[pa];B[kc];W[na];B[nb];W[la];B[ja];W[na])

(;B[ib];W[ic];B[hb];W[jd])
)
)

(;W[lb];B[na];W[lc];B[pb];W[qb];B[pa];W[rd];B[re];W[sb];B[ra];W[qa];
B[sd];W[le])
)
)
)
)

(;B[nd];W[md];B[nc];W[mc];B[ob];W[pb];B[mb];W[lc];B[lb];W[kc];B[kb];
W[jc];B[jb];W[og];B[rh];W[ic]C[White is superior.];B[rd];W[qi];B[ri];
W[qk]
C[White's influence is superior. Black can play 'A' or tenuki 'B'.]
LB[dp:B][rb:A]
(;B[rb])

(;B[dp];W[rc]
C[White can reduce Black's corner by forcing Black to take out
the White stones on 'A' or 'B'.]
LB[ib:B][rj:A])
)
)

(;W[le];B[rc]C[White continues with 'a' or 'b'.]LB[kd:b][md:a]
(;W[md];B[qb]C[Later, White occupies A or B.]LB[id:B][hd:A])

(;W[kd];B[qb];W[lc])
)

(;W[nc];B[rc];W[qb]C[Black gets a better result.];B[qj])

(;W[md]
C[White 12 is not recommended, as it provokes Black to strengthen
his stone.]
;B[le];W[rc])
)

(;B[rd]
C[Now that Black has played this Black 11, White must not push
on the triangled point and damage White 4.]
LB[rd:11][pg:4]TR[nf];W[nc];B[rc];W[qb]
C[Black can attack the White group on  'A'. The attack on 'B' is less powerful.
'C' strengthens the right group and treats the top stone lightly, allowing White to settle easily.
]
LB[md:A][mb:B][pj:C]
(;B[md];W[nd];B[mb]
C[The move induces White to force Black to strenghen himself.
];W[nf];
B[og])

(;B[mb]C[Later, the following continuation may occur.];W[mf];B[id];
W[qg])

(;B[pj];W[lb])
)
)

(;W[nf]C['a' is correct, 'b' is a mistake.]LB[qc:b][og:a]
(;B[og];W[qc]
C[Now that White has played White 12 and White 10 in the wrong
order, Black punishes on 'A'. 'B' reverts to the usual joseki.]
LB[qe:B][rd:A][nf:10][qc:12]
(;B[rd]
C['A' is correct, 'B' is possible with the ladder.
Now White 4 is damaged without reason.]
LB[pg:4][rc:B][pb:A]
(;W[pb])

(;W[rc];B[nd]C['A' is correct, 'B' is wrong.]LB[pe:B][md:A]
(;W[md];B[nc];W[mc];B[ob];W[oc];B[nb];W[mb];B[pb];W[pc];B[me];W[kb];
B[kc];W[lb];B[lg])

(;W[pe];B[pf];W[qe];B[re];W[sd];B[rf];W[md];B[nc];W[mc];B[pc])
)
)

(;B[qe]C['A' is joseki. 'B' is possible if White has the ladder.]
LB[rc:B][pb:A]
(;W[pb]
C[
White 14 protects the cutting point at 'a', as long as White
has the triangled liberty.]
LB[nd:a]TR[pe])

(;W[rc]
C[White 14 was played by Hane Naoki Kisei in a Kisei title match
14.1.2006 in Berlin.
'A' is usual. 'B' starts the ladder.]
LB[rc:14][nd:B][pj:A]
(;B[pj]C['A' is correct. Tenuki 'B' is wrong.]LB[dp:B][nc:A]
(;W[nc])

(;W[dp];B[nd];W[md];B[nc];W[mc];B[ob];W[oc];B[nb];W[mb];B[pb];W[pc];
B[me];W[kb];B[kc];W[lb];B[lg];W[mg];B[mf];W[ng];B[mh];W[nh];B[ni];
W[oh];B[ph];W[oi];B[oj];W[pi];B[qi])
)

(;B[nd];W[md];B[nc];W[mc];B[ob];W[oc];B[nb];W[mb];B[pb];W[pc];B[me];
W[kb];B[kc];W[lb];B[lg];W[mg];B[mf];W[ng];B[nh];W[mh];B[mi])
)
)
)

(;B[qc]C[Black 11 is not recommended.];W[og];B[qe];W[mg];B[nd];W[md];
B[nc];W[mc]C[White's influence exceeds Black's profit.])
)

(;W[pe]
C[White 10 used to be considered a vulgar mistake, but this variation
has been played professionally and found satisfactory.]
;B[pf];W[qe];B[nd]
C[White 'a' is the traditional continuation. White 'b' is recent.]
LB[rf:b][nc:a]
(;W[nc];B[md];W[rf];B[rg];W[re];B[qg]
C[White 'a' is an important follow-on. 'b' shows the impact of
White playing elsewhere.]
LB[dp:b][lb:a]
(;W[lb])

(;W[tt];B[nb];W[ob];B[mc];W[oc])
)

(;W[rf]
C[White 14 was played in a 1979 Nie-Sonoda match and the players
consider the result even.]
;B[rg];W[rd];B[qg];W[nc];B[md]C[White has a solid large corner.])
)
)

(;B[pe];W[qc]
C[Black continues with 'a *' (Black sente) or 'b *' (Black gote).
Black 'c' is a trick play that can be foiled.]
LB[rc:c][re:b][qe:a]
(;B[qe];W[nc];B[rc];W[qb]C[
* GOOD VARIATION *])

(;B[re]
C[White continues with 'a *'. White 'b' gives a slightly unfavorable
result.]
LB[rc:b][rd:a]
(;W[rd];B[qe];W[nc];B[rc];W[rb];B[sd]
C[
* GOOD VARIATION *

The joseki concludes.];W[tt]
C[White plays elsewhere.

Black follows up with 'a' or 'b'.]
LB[qb:b][mb:a]
(;B[mb];W[pb])

(;B[qb];W[lb];B[pc];W[mf]C[White 22 is correct shape.])
)

(;W[rc];B[nd];W[nc];B[md]LB[ob:b][mb:a])
)

(;B[rc]
C[Black 11 is a trick play. White counters with 'a'. White falls
into a trap with 'b'.]
LB[rd:b][qe:a]
(;W[qe]C[White counters the trick play.];B[rd]
C['A' is modern Korean style and better than 'B', old Japanese
style.]
LB[qf:B][md:A]
(;W[md]
C[Black must choose if he allows White to united his stones after
'A' or if he allows White to make his pincer stones uninteresting
after 'B'.]
LB[qf:B][le:A]
(;B[le];W[qf];B[pc];W[oc];B[qb];W[mg];B[ob]
C['A' is correct, 'B' nonsense.]LB[og:B][nf:A]
(;W[nf]C[All White stones united.])

(;W[og];B[nf];W[mf];B[me];W[nd];B[mc])
)

(;B[qf];W[lc])
)

(;W[qf];B[nd];W[nc];B[md];W[qb];B[rb];W[ob];B[qa];W[pc]
C[White 22 is a good move. Black 'a' doesn't work because of White
'b'. Black 'b' is the only move, but it falls short.]
LB[pa:b][mb:a];B[pa];W[lb]
C[Black must play 'a'. Black 'b' is a fatal mistake.]LB[pb:b][ra:a]
(;B[ra];W[mb];B[re]C[Both sides live.])

(;B[pb]C[Black 25 is a serious mistake. Black dies.];W[oc];B[kb];W[mb]
;B[lc];W[ra];B[sa];W[ka];B[jb];W[na];B[la];W[re]
C[Black comes up short. Time to resign.])
)
)

(;W[rd]C[White falls into a trap.];B[qe];W[rb];B[pc];W[qb];B[nd];W[oc]
;B[nc];W[ob];B[re])
)
)

(;B[qe]C['A' is correct. 'B' is a mistake if Black has the ladder.]
LB[pe:B][qc:A]
(;W[qc];B[rc];W[pe]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.]
;B[pf];W[qf];B[rf];W[qg];B[og];W[rb]
C['A' is correct, 'B', C' and 'D' are not recommended.]
LB[rg:D][qb:C][oh:B][ph:A]
(;B[ph];W[qh];B[pc];W[qb];B[qi];W[oh];B[mf];W[pi];B[oc];W[nd];B[nc];
W[rd];B[re];W[sc];B[nf];W[rg]C[Later];B[md];W[sf];B[me];W[se])

(;B[oh];W[rg];B[pc];W[qb];B[nd];W[oc];B[nc];W[ob];B[rh];W[qh];B[qi];
W[ri];B[qj];W[sh];B[oj])

(;B[qb];W[oh];B[mf];W[me];B[nh];W[oi]
C['A' without the ladder, 'B' with the ladder.]LB[le:B][lf:A]
(;B[lf];W[pc];B[sb];W[rd];B[ra];W[re])

(;B[le];W[mg];B[lf];W[nf];B[ng];W[mh];B[ni];W[nj])
)

(;B[rg];W[rd];B[re];W[sc]C['A' or 'B' don't help.]LB[nd:B][ph:A]
(;B[ph];W[me])

(;B[nd];W[nc]C['A' or 'B' don't help.]LB[md:B][ph:A]
(;B[ph];W[md])

(;B[md];W[oh];B[mf];W[nh]C['A' or 'B' don't help.]LB[qi:B][mg:A]
(;B[mg];W[rh];B[qh];W[ph];B[qi];W[ri]C['A' or 'B' don't help.]
LB[rj:B][qj:A]
(;B[qj];W[rj]C['A' or 'B' don't help.]LB[qk:B][rk:A]
(;B[rk];W[qk];B[rl];W[pj])

(;B[qk];W[sg])
)

(;B[rj];W[qj];B[pi];W[pj];B[oi];W[rk])
)

(;B[qi];W[ph];B[nf];W[rh];B[qh];W[ri])
)
)
)
)

(;W[pe];B[pf];W[qf]C['A' with the ladder, 'B' without.]LB[og:B][qg:A]
(;B[qg];W[rf]LB[og:B][rg:A];B[rg];W[og]C[This ladder mustn't work.];
B[nf];W[mf])

(;B[og]C[If the ladder is unfavorable to Black.];W[qc]
C[White 14 is the vital point.];B[rf];W[qg];B[rc]
C[Same variation as White 14 played before White 10]LB[qc:14][pe:10])
)
)
)

(;W[qc]C['A' is ok. 'B' is getting tricked.]LB[rc:B][qf:A]
(;B[qf]
C['A *' is the joseki continuation White 8 is aiming for. White
'B *' just reverts to the older joseki.]
LB[qc:8][pd:B][rd:A]
(;W[rd]
C['A *' is joseki leaving little aji in the Black wall,
'B *' is a fighting joseki.
'C' is a mistake.]
LB[re:C][nd:B][pc:A]
(;B[pc];W[pd];B[qe];W[rc]C['A *' is joseki.
'B' is similar.]
LB[nd:B][nc:A]
(;B[nc]
C['A *' is ok.
'B' foolishly starts a difficult fight where White comes out
bad.]
LB[nc:15][nd:B][oc:A]
(;W[oc];B[nd]C[
* GOOD VARIATION *])

(;W[nd];B[oc];W[mc];B[mb];W[lb];B[lc];W[md];B[nb];W[kb];B[qb];W[rb];
B[pb];W[qa];B[le];W[mf];B[oa]
C[Soon, White has to force a seki on 'A'.
Black can kill the corner on 'A'.]
PL[2]LB[ma:A]
(;W[ma];B[re];W[sd];B[ra];W[sa];B[se];W[ra];B[sb]
C[White has two weak groups, Black only one, so White is in an
inferior position.])

(;B[ma];W[re];B[rf];W[se];B[ra];W[sa];B[sc])
)
)

(;B[nd]C['A' is sente, 'B' takes more points, but is gote.]
LB[nc:B][oc:A]
(;W[oc]C['A' is necessary, tenuki 'B' is nonsense.]LB[dp:B][nc:A]
(;B[nc])

(;B[dp];W[md];B[nc];W[mc];B[nb];W[mb];B[me];W[nf];B[mf];W[ng];B[ob];
W[pb];B[lc];W[oa])
)

(;W[nc];B[md];W[oc])
)
)

(;B[nd];W[oc];B[re];W[pd];B[qe];W[md];B[me];W[nc];B[nf];W[le];B[nd];
W[mc];B[kd];W[lf];B[je];W[rc];B[qk];W[mf];B[ne];W[lh];B[nh];W[jg])

(;B[re];W[pd];B[qe];W[nc];B[rc];W[rb];B[sd];W[qb]
C[White's position is better than after the joseki, so Black 11
is wrong.]
LB[re:11])
)

(;W[pd];B[qe];W[nf];B[og];W[pb])
)

(;B[rc]
(;W[pd])

(;W[pd]C['A' or 'B'. Black must have the ladder for 'B'.]
LB[qe:B][pe:A]
(;B[pe];W[qe];B[rd];W[qf];B[qb];W[md];B[le];W[mg];B[og];W[oh];B[ph];
W[ng];B[qg];W[nf])

(;B[qe];W[pe];B[pf];W[qf])
)
)
)
)

(;B[pd]
C[Black 7 first appeared in a title game in 1975 by Hashimoto Shoji
against Rin Kaiho for the 13th Judan Title.]
;W[of];B[oc];W[pe];B[nc])

(;B[pe]
C[Black 7 is slow.

White continues with 'a'. White 'b' results in poor shape.]
LB[md:b][nf:a]
(;W[nf]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[nd:b][pc:a]
(;B[pc];W[nc])

(;B[nd]C[The cut of Black 9 is obvious, and a mistake.];W[md];B[nc];
W[mc];B[ob];W[nb];B[oc];W[le]
C[White has wonderful shape to the top left.])
)

(;W[md]
C[White 8 is not recommended, as White does not get good shape.];B[nf]
;W[mf];B[ng]C[White has poor shape.])
)
)

(;W[pe]C[White 6 is a mistake.];B[pd]
C['A' is correct, 'B' is questionable.]LB[oc:B][ne:A]
(;W[ne];B[of];W[pf]
C[Black can connect underneath with 'a' and gets a favorable result.
If White cannot get a ladder with 'b', Black simply cuts at 'c'.
'd' is possible.]
LB[og:d][nd:c][nf:b][oc:a]
(;B[oc];W[nd];B[nc];W[ng])

(;B[nd]C[Black plays 11 if White does not have the ladder.];W[oc];
B[nc])

(;B[og];W[oh];B[mf])
)

(;W[oc];B[ne];W[qe];B[re])
)

(;W[pd]
C[White 6 is a mistake in direction. White should first go to the
outside, not inside.]
;B[pe];W[qc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[nd:b][qe:a]
(;B[qe]C[White continues with 'a'. White 'b' is a mistake.]
LB[ne:b][nd:a]
(;W[nd];B[ne];W[rc];B[md])

(;W[ne]C[White 10 is unreasonable.];B[nd];W[nc];B[md];W[rc];B[nf]
C[Black retains potential for a later squeeze play on White's corner
stones.])
)

(;B[nd]C[Black 9 is an overplay.];W[qe];B[rd];W[rc];B[qf];W[re];B[rf];
W[sd]C[Black is left with cutting points at 'a' and 'b'.]
LB[ne:b][pf:a])
)
)

(;B[pd];W[oe];B[oc];W[nc];B[nd]
C[White continues with 'a'. White 'b *' is also possible. White
'c' is a mistake.]
LB[ob:c][pc:b][mc:a]
(;W[mc]C[Black plays 'a' or 'b'.

'c' and 'd' are miai.]
LB[pc:d][md:c][ne:b][ob:a]
(;B[ob];W[md];B[ne];W[me];B[nf];W[pe];B[og]
C[The results from this are favorable to White.];W[qe];B[ph];W[qg]
C[Black 'a' saves the corner. 

Black 'b' is unreasonable.]
LB[qh:b][qb:a]
(;B[qb]C[Black 21 is necessary to save the corner.];W[qh];B[pi];W[rj])

(;B[qh]C[Black 21 unreasonable.];W[rh];B[ri];W[rf];B[sh];W[rg];B[oh];
W[rd];B[rc];W[rb];B[sd];W[qc]
C[White takes the corner because Black must play 27 to defend against
the cut.

Black may try 'a' or 'b'.]
LB[oh:27][pc:b][re:a]
(;B[re];W[pc];B[rd]
C[White continues with 'a'. White 'b' is a mistake.]LB[qb:b][pb:a]
(;W[pb];B[sf];W[sb];B[pf];W[sc];B[of];W[se])

(;W[qb]C[White 36 is a mistake. White loses by a move.];B[pf]
C[Black 37 is the tesuji.];W[qf]C[Black continues with 'a' or 'b'.]
LB[sf:b][of:a]
(;B[of];W[sf];B[si])

(;B[sf];W[of];B[sg])
)
)

(;B[pc];W[sc];B[qb];W[rc])
)
)

(;B[ne];W[ob];B[pc];W[pe]
C[Black continues with 'a'. Black 'b' is unreasonable.]LB[lc:b][pb:a]
(;B[pb];W[lc];B[kd];W[jc])

(;B[lc]C[Black 15 is unreasonable.];W[lb];B[kb];W[pb];B[qb];W[rb]
C[Black continues with 'a'. Black 'b' looks better, but is worse.]
LB[qa:b][pa:a]
(;B[pa];W[nb]
C[Black saves the corner with 'a', or protects against the cut
with 'b' (and thereby loses the corner).]
LB[jc:b][rc:a]
(;B[rc];W[kc])

(;B[jc];W[rc])
)

(;B[qa]C[Black 21 loses the corner.];W[nb];B[la];W[rc];B[qc];W[rd];
B[qe];W[qf];B[re];W[ra])
)
)
)

(;W[pc]
C[White 10 is intended as a sacrifice play in the corner for the
right side, though Black has options.]
;B[ob];W[pb];B[nb];W[rc]
C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[rd:b][qc:a]
(;B[qc];W[qb];B[rb];W[ra];B[sb];W[sc];B[pa];W[sa];B[rb];W[sb];B[oa];
W[rd];B[qa];W[qe];B[rb];W[qb]C[
* GOOD VARIATION *]LB[mc:a])

(;B[rd]C[Black 15 is not recommended.];W[qc];B[rg];W[pe];B[qf];W[mc];
B[mb];W[lc];B[kc];W[lb];B[kb];W[md];B[me];W[la];B[ne];W[le];B[pf];
W[of];B[ng];W[og];B[kd];W[mg];B[lf];W[mf];B[ke];W[nf];B[le];W[qg]
C[White gets the right, Black the top. White comes out ahead.])
)

(;W[ob]C[White 10 is vulgur.];B[pc];W[md];B[ne];W[me];B[nf];W[mc];
B[of]
C[It is hard to imagine this result favoring White. Losing the
two White stones is bad.])
)

(;B[of]
C[Black 'c' was popular among leading amateur players, and is a
relatively recent introduction to professional Go, so all variations
have not been explored.

White 'a' and 'b' are feasible. White 'c' is probably unreasonable.]
LB[pf:c][pe:b][og:a]
(;W[og]C[White 6 temporarily sacrifices the approach stone.];B[oe]
C[After Black 7 White plays elsewhere. Black will probably add
a move at 'a' or 'b' at an early stage.]
LB[pd:b][nd:a])

(;W[pe]
C[This comes from Kajiwara (W) vs. Kuwahara (W), preliminary round,
14th Judan Title (1975).]
;B[pf];W[qe];B[qf];W[rf]
C['A' or 'B' are ok. 'A' is the Japanese, 'B' the Korean variation.]
LB[rd:B][qg:A]
(;B[qg];W[rd];B[nd];W[nc];B[oe]C[White continues with 'a' or 'b'.]
LB[pd:b][oc:a]
(;W[oc];B[mc];W[ne];B[md]
C[White ends in sente, but Black has a good endgame move.];W[dp]
C[White plays elsewhere.];B[pd]
C[Black's endgame moves that are sente, and leave White with a
small corner.]
;W[re];B[pb];W[pc];B[nb];W[qc])

(;W[pd];B[mc];W[ne];B[md]C[Next, White plays elsewhere.])
)

(;B[rd];W[re];B[qg];W[qc]C['A' is correct, 'B' a mistake.]
LB[pc:B][nd:A]
(;B[nd];W[nc];B[oc];W[pc];B[oe]
C['A' lets Black close the top, 'B' the right side. 'A' is usually
coherent with the aim of the joseki choice.]
LB[ob:B][pd:A]
(;W[pd];B[mc];W[ob])

(;W[ob];B[pd];W[oc];B[rg];W[rc])
)

(;B[pc];W[pd]C['A' is disadvantageous, 'B' is getting killed.]
LB[rc:B][qb:A]
(;B[qb];W[rc];B[rb];W[sd];B[oc];W[nc];B[nb];W[mc];B[mb];W[lc];B[lb];
W[kc])

(;B[rc];W[qb])
)
)
)

(;W[pf]C[White 6 is not recommended.];B[oe];W[pe];B[pd];W[oc]
C[Black continues with 'a'. Black 'b' is an odd move, and a mistake.]
LB[pb:b][og:a]
(;B[og];W[ph];B[oh];W[pi];B[nd]
C[White continues with 'a'. White 'b' is unreasonable.]LB[nc:b][oi:a]
(;W[oi];B[nc])

(;W[nc]C[White 16 takes on an unreasonable fight.];B[mc];W[ne];B[md];
W[qb];B[rb]
C[White sets up a ko with 'a', or a downright loss with 'b'.]
LB[pb:b][ra:a]
(;W[ra];B[pb];W[pc];B[qc];W[pa]
C[White sets up a ko, but has no local ko threats.])

(;W[pb];B[rc];W[re]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nb:b][ra:a]
(;B[ra]
C[Black 25 is the tesuji that gives Black enough liberties to win
the fight.]
;W[mb];B[lb];W[na];B[la])

(;B[nb]C[With Black 25, the fight becomes favorable to White.];W[ra]
C[The vital point.])
)
)
)

(;B[pb]C[Black 11 is a mistake.];W[ob];B[pc];W[og];B[me];W[lb];B[jc];
W[jb];B[ic];W[re];B[qe];W[rf];B[rd];W[ib];B[hc];W[hb];B[gc];W[kc];
B[kd];W[mc])
)
)

(;B[pf];W[of];B[og];W[pe];B[qf];W[qe];B[nf];W[oe])

(;B[qf]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.]
;W[of]C['A' or 'B'.]LB[qg:B][id:A]
(;B[id];W[qg])

(;B[qg];W[pi];B[ph];W[oh];B[qh];W[ni];B[qj];W[id])
)

(;B[oc]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.

'A' is correct, 'B' is disadvantageous.]
LB[pd:B][nc:A]
(;W[nc]C['A' takes the top or a wall, 'B' the right side.]
LB[pc:B][nd:A]
(;B[nd]
C['A' takes the right side, 'B' the corner, 'C' is disadvantageous,
'D' is nonsense.]
LB[oe:D][mc:C][pc:B][ne:A]
(;W[ne];B[md];W[pc];B[ob];W[pd];B[pb];W[qb];B[qc];W[rb];B[mc];W[qe]
C[Later Black A.]LB[ng:A])

(;W[pc]
C['A' is better than 'B'.
'A' makes a wall, 'B' takes some territory.]
LB[ob:B][oe:A]
(;B[oe];W[pd];B[pe]
C['A', 'B' or 'C' give Black a wall for a large corner.
White must have the ladder for 'C'.]
LB[ne:C][ob:B][qe:A]
(;W[qe]C['A' makes a wall, 'B' takes the top side.]LB[ob:B][mc:A]
(;B[mc];W[ob];B[qf];W[re];B[pf];W[rd])

(;B[ob];W[ne];B[md];W[of];B[pb];W[qc];B[qb];W[rc])
)

(;W[ob];B[md];W[qe];B[qf];W[re];B[pf];W[rd])

(;W[ne];B[md];W[qe];B[qc];W[pb];B[qf];W[re]
C['A' makes a wall and gives a large corner.
'B' starts the ladder.]
LB[rf:B][pf:A]
(;B[pf];W[rf];B[qg];W[qb];B[nf])

(;B[rf];W[pf];B[of];W[nf];B[og];W[oh];B[ng];W[mg];B[nh];W[ni])
)
)

(;B[ob]C['A' is correct, 'B' is very bad.]LB[pb:B][pd:A]
(;W[pd]C['A' is better than 'B'.]LB[mc:B][pb:A]
(;B[pb];W[qb];B[qc];W[rb];B[mc];W[ne];B[md];W[qe])

(;B[mc];W[nb];B[pb];W[ne];B[md];W[qb];B[mb];W[qc])
)

(;W[pb];B[pd];W[oe];B[nb];W[mc];B[qb];W[mb];B[qc];W[jc];B[ne];W[pe];
B[lf]C[good for Black.])
)
)

(;W[mc];B[oe];W[pd];B[pe];W[pc];B[qc];W[ob];B[pb];W[oc];B[md])

(;W[oe];B[ob])
)

(;B[pc];W[nd]C['A' or 'B'. Black needs the ladder for 'B'.]
LB[pe:B][qf:A]
(;B[qf];W[ng]C['A' or 'B'.]LB[id:B][qg:A]
(;B[qg];W[ph];B[qi];W[id])

(;B[id];W[qg])
)

(;B[pe];W[pd];B[qc];W[qe];B[qf];W[re];B[rf];W[pf];B[oe];W[ne];B[of];
W[ng];B[se];W[nf];B[rd];W[hd])
)
)

(;W[pd];B[pc];W[qe]C['A' punishes, 'B' and 'C' fail.]
LB[re:C][nd:B][qc:A]
(;B[qc];W[nd];B[nc]C[Now the triangled stone is in a bad position.]
TR[pg])

(;B[nd];W[qc];B[rd];W[qb];B[re];W[qf];B[rc];W[rb];B[pb];W[nc];B[nb];
W[mc];B[mb];W[pa];B[ob]C['A' is correct, 'B' is questionable.]
LB[lc:B][sb:A]
(;W[sb];B[lc];W[rf];B[hd];W[qk])

(;W[lc];B[md];W[lb];B[sb];W[kd];B[ke];W[jd];B[lf];W[rf];B[pj];W[oi])
)

(;B[re];W[rd];B[qc];W[rf];B[nd];W[se];B[of];W[pf])
)
)
)

(;W[qe]
C[There is a ladder here, which should be favorable for White to
play this way. 

Black 'a *' takes territory. Black 'a' is recommended for Black
unless there are mitigating cirumstances. Black takes the right
with 'a'.

Black 'b *' goes for influence, but Black may have problems if
White has the ladder, as Black develops cutting points and potentially
loses the corner.

Black 'c' leads to the Magic Sword of Muramasa. With a favorable
ladder, White can always get a good result. Black takes the right,
White much of the corner and into the center.]
LB[pd:c][pe:b][re:a]
(;B[re]C[White draws back with 'a *'. White 'b' is a mistake.]
LB[qf:b][pe:a]
(;W[pe]
C[
Without Black 3, the position is a takamoku (5-4-point) joseki, 
where b is the main variation to continue with.

But with Black 3 in this variation, Black continues with 'a *'.
 
Black 'b' is not recommended, if White
has the ladder (which White should have to have played this way).]
LB[ld:3][qf:b][rf:a]
(;B[rf];W[qc]
C['A *' keeps White attackable, 'B *' is an older joseki.
]
LB[rc:A][rd:B]
(;B[rc];W[pd];B[rd];W[ph];B[qb];W[id];B[lf]
C[Black is low, but White has zero points.

* GOOD VARIATION *
])

(;B[rd]
C[Joseki continues at 'a *'. The old joseki is at 'b', but White's
shape has problems. 'c' is possible.]
LB[ph:c][pc:b][oc:a]
(;W[oc]C[White 10 was invented by Kubouchi Shuchi 9-dan.];B[pg];W[lb]
C[
* GOOD VARIATION *])

(;W[pc];B[pg]
C[White moves out with 'a', or blocks at 'b'. Neither are particularly
good.]
LB[mc:b][nf:a]
(;W[nf]
C[White's shape is thin. Black can spoil White's position with
'a' or 'b'. White 10 is too heavy.]
LB[nd:b][mc:a];B[qj])

(;W[mc];B[lc];W[md]
C[White becomes overconcentrated while making Black strong and
with no compensation.]
;B[le];W[nf]
C[White is overconcentrated, and has no compensation for letting
Black build a wall at top.])
)

(;W[ph];B[pc];W[oc];B[pb];W[pd];B[qb]PL[2];B[pg]
C[Later, this Black attack is no big problem for White.];W[og];B[qg];
W[oh];B[of];W[nf];B[ne];W[pf];B[oe];W[me];B[nd];W[md];B[nc];W[nb];
B[mc];W[lc];B[mb];W[lb])
)
)

(;B[qf]
C[
White plays 'a' and gets a favorable result with a favorable
ladder to the bottom-left. Conversely, White must play 'b' if
the ladder is unfavorable, and gets an unfavorable result.]
LB[rf:b][rd:a]
(;W[rd];B[rc];W[rf];B[sd];W[qg])

(;W[rf]C[Black must have the ladder for White to play this way.];B[rg]
;W[rd];B[sf];W[qc];B[pf]
C[Black 13 is the vital point.

White continues with 'a'. White 'b' is not recommended.]
LB[of:b][ne:a]
(;W[ne]C[White 14 makes correct shape in this position.];B[of];W[nc])

(;W[of]
C[White 14 lets Black build thickness, while Black 3 sits in the
way of White developing a good position.]
;B[og];W[nf];B[ng])
)
)
)

(;W[qf]C[White 6 lets Black make good use of the pincer stone.];B[pd];
W[oe];B[rf]
C[White continues with 'a' or 'b'. Black pushes through and cuts
at the marked location regardless.

The pincer at Black 3 is in perfect position to help in the ensuing
fight.]
LB[ph:b][qh:a]CR[of]
(;W[qh];B[pe];W[pf];B[of])

(;W[ph];B[pe];W[pf];B[of])
)
)

(;B[pe]
C[Black 5 is a fierce move. Black may have problems if White has
the ladder, as Black develops cutting points and potentially
loses the corner.]
;W[pd]C['A *' is joseki, 'B'.]LB[oe:B][qf:A]
(;B[qf]C[White continues with 'a *'. White 'b' is timid.]
LB[qc:b][re:a]
(;W[re];B[qc];W[rf];B[oe]
C[White continuing with 'a *', hastening to take the corner, is
joseki.

White 'b' next is a nistake.

White 'c' is undeveloped as a variation, and not recommended.]
LB[nd:c][ne:b][pb:a]
(;W[pb];B[qb];W[pc];B[qg]C['A *' is joseki, 'B' is a mistake.]
LB[rg:B][rd:A]
(;W[rd];B[ne]
C[
* GOOD VARIATION *

Black 'a' is sente (White responds at 'b'), but there is no hurry
to play it. Black may choose 'c' if the top is desired later.]
LB[ob:c][rb:b][rg:a];W[tt]C[White plays elsewhere.];B[ob]
C[Black takes the top.];W[qa];B[nd];W[rb])

(;W[rg];B[ne]C['A' is necessary, 'B' leads to a big loss.]
LB[qh:B][mc:A]
(;W[mc];B[lc];W[lb];B[kb];W[mb];B[jc];W[rd])

(;W[qh];B[ob];W[nc];B[mc];W[nb];B[pa];W[oc];B[nd])
)
)

(;W[ne]C[White 12 is a mistake.];B[pg]
C['a' and 'b' are miai. White 'c' does little good. White 'd' results
in a large loss.]
LB[qg:d][md:c][nd:b][rg:a]
(;W[rg];B[nd])

(;W[nd];B[rg])

(;W[md];B[rg];W[le])

(;W[qg]C[White 14 is a mistake.];B[nd];W[pf];B[of];W[og];B[nf];W[ph];
B[me]C[This result is terrible for White.])
)

(;W[nd]C[White 12 is an undeveloped variation.];B[ob]
C[Black can live in the corner or connect to the pincer stone.
The outside stones have aji.])
)

(;W[qc]C[White 8 is a mistake born of timidity.];B[re];W[rc];B[nc]
C[White still lacks proper eye shape.])
)

(;B[oe]
C[If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.])
)

(;B[pd]
C[Black 5 begins the Magic Sword of Muramasa. White gets a good
result with a favorable ladder. 

Black takes the right, White much of the corner and into the
center.]
;W[pe];B[oe]
C[
The Magic Sword of Muramasa
---------------------------------

White should have the ladder to play this way.

White continues with 'a' or 'b'. White 'a' is not as favorable,
but avoids compliations. White must have the ladder to play 'b'.
]
LB[nd:b][rd:a]
(;W[rd]C[White 8 attempts to avoid complications.];B[rc];W[re];B[oc];
W[nd]
C[Black continues at 'a' or 'b'. Black 'b' is a fighting move that
puts White in trouble.]
LB[ne:b][nc:a]
(;B[nc]C[White continues at 'a'. White 'b' is a mistake.]
LB[ne:b][mc:a]
(;W[mc];B[md];W[ne];B[qb];W[of]C[Black has a slightly better result.])

(;W[ne]C[White 14 is a mistake.];B[of];W[mc];B[qb]
C[White has been split in two; the ensuing fight favors Black.])
)

(;B[ne]
C[Black 13 is a tough-minded move that gives White serious trouble.];
W[nc];B[ob];W[nb];B[qb];W[me];B[og]
C[Black 19 makes miai of 'a' and 'b': White is in trouble.]
LB[qg:b][md:a])
)

(;W[nd]
C[White must have the ladder to play this way.

Black continues with 'a' or 'b'.]
LB[ne:b][re:a]
(;B[re];W[rf];B[rd];W[of];B[qf];W[ne];B[qg])

(;B[ne]C[Black 9 attempts mischief.];W[me]
C[Black 'a' is correct. Black 'b' shows foolish fighting spirit.]
LB[mf:b][og:a]
(;B[og];W[md]C[White can afford to give up the two stones.];B[qg];
W[pb]C[White 14 is a good forcing move.];B[re];W[id]
C[White 'a' is sente. White 'b' later is big.]LB[rc:b][mf:a])

(;B[mf]C[Black 11 is a mistake, though White must answer with care.];
W[md];B[le]C[Black has too many cutting points.];W[lc];B[kc];W[mb];
B[lb];W[mc];B[kb];W[pc];B[qc];W[pb]
C[Black 'a' ends in grief. Black 'b' builds magnificant thickness
while giving White a huge corner.]
LB[re:b][qb:a]
(;B[qb];W[rd];B[rc];W[re];B[nb];W[sc]
C[If Black 'a', White 'b' wins the fight.]LB[qa:b][sb:a])

(;B[re];W[rf];B[rd]
C[White continues with 'a'. White 'b' is a mistake.]LB[qb:b][qf:a]
(;W[qf]
C[Black continues at 'a'. 

Black 'b' doesn't work if White has the ladder.]
LB[qb:b][og:a]
(;B[og];W[qb];B[rb];W[sc];B[lf]C[White gets a better result.])

(;B[qb]
C[Black 27 is only possible if White does not have the ladder.
Otherwise, Black 27 is a mistake.]
;W[nf];B[of];W[ng];B[og];W[oh];B[pg];W[ph];B[qg];W[lf]
C[If White has the ladder, Black 'a' and 'b' are both bad, but
Black is better off with 'a'.]
LB[qh:b][mg:a]
(;B[qh];W[mg];B[pi];W[hd])

(;B[mg]C[Black 37 is a mistake.];W[nh];B[lh];W[rg];B[qh];W[qi];B[rh];
W[ri];B[sh]
C[Black lives in the corner, small consolation for a terrible result.])
)
)

(;W[qb]C[White 26 is a mistake.];B[qg]
C[White continues with 'a', possibly 'b'.]LB[pg:b][qf:a]
(;W[qf];B[rg];W[sf];B[og];W[sd];B[lf]
C[White has a large corner, but Black has magnificant thickness.])

(;W[pg];B[ph];W[nf];B[of];W[og];B[ng];W[pf];B[nf];W[oh]
C['a' and 'b' are miai.]LB[lf:b][qh:a]
(;B[qh];W[lf];B[nh];W[oi]
C[Black is in a very uncomfortable situation.])

(;B[lf];W[qh];B[pi];W[rh])
)
)
)
)
)
)
)
)

(;W[pf]
C[White 4 is joseki, but very complicated.
'A' is joseki, 'B' is questionable.]
LB[qf:B][oe:A]
(;B[oe];W[pe];B[pd]
C[White 'A' is joseki. 'B' is very complicated and disadvantageous for White.. White 'C' is inferior.
]
LB[nd:A][oc:B][ne:C]
(;W[nd]C['A' or 'B'.]LB[of:B][og:A]
(;B[og]C['A', 'B' or 'C'.]LB[re:C][lc:B][me:A]
(;W[me];B[of];W[re]
C['A' is correct, 'B' was played between Yi Chang-ho and Chang
Hao, but is not recommended..
'C' is possible.]
LB[rd:C][pg:B][ob:A]
(;B[ob];W[rd];B[rc];W[qh];B[mc];W[le];B[ke];W[kf];B[je];W[lg];B[oi];
W[qj]PL[2])

(;B[pg];W[rd];B[rc];W[rg];B[qg];W[rf];B[oc];W[nc];B[rh];W[qb];B[rb];
W[ob];B[qc];W[ri];B[qh];W[sh];B[pb];W[qj])

(;B[rd];W[rg];B[pg];W[qg];B[qh];W[rh];B[qi];W[ri];B[qj];W[pc];B[qc];
W[pb];B[qb];W[nb]C['A' is correct, B is a mistake.]LB[rj:B][qe:A];
B[qe];W[qf];B[sf]C[Black can live on A or capture on B.]LB[rj:B][rf:A])
)

(;W[lc];B[of];W[kd];B[pg])

(;W[re];B[rd];W[me];B[of];W[qh];B[ph];W[rg];B[mf];W[pc];B[qc];W[pb];
B[qb];W[le];B[qi];W[ri];B[qg];W[rh];B[qf];W[qj];B[pi];W[kd];B[ql];
W[pj];B[rk];W[rj];B[rf];W[pl])
)

(;B[of]C['A' is correct, 'B' is a mistake.]LB[og:B][re:A]
(;W[re];B[qe];W[qf];B[rd];W[rf];B[ob];W[me];B[oh];W[qi];B[pj])

(;W[og];B[me])
)
)

(;W[oc]C[
'a' is ok for punishment, 'b' is also possible.
]
LB[of:b][ne:a]
(;B[ne];W[qb]LB[rf:A][rb:B]C['A' is correct, 'B' is a mistake.
]
(;B[rf]LB[qg:A][rb:B]C['A' is ok, 'B' is a mistake.
]
(;W[qg];B[rb];W[pb];B[rg];W[qi]LB[qh:A][rh:B]
C[Black plays 'A', because White B would be sente.
];B[qh];W[ph];B[rh]
LB[lb:A][ri:B]C[White plays 'A', White B is gote.
];W[lb];B[jc]
LB[nb:A][jb:B]
C[White 'A' is necessary and very submissive, White 'B' is not good.
]
(;W[nb])

(;W[jb];B[mb]C[Punishment
'A' or 'B' don't give a good result.
]
LB[mc:A][nb:B]
(;W[mc];B[lc]LB[kb:A][nb:B]C['A' or 'B'.
]
(;W[kb];B[nc];W[nb];B[md];W[ma];B[ic]C[Ko for White's second eye.
])

(;W[nb];B[kb]LB[jb:22]C[Whtie 22 useless.
])
)

(;W[nb];B[mc];W[ma];B[ic]C[W not yet alive.
])
)
)

(;W[rc];B[rd];W[qg];B[pb];W[pc];B[qc];W[rb];B[ob];W[nc];B[nb];W[mc];
B[mb];W[lc];B[kc];W[lb];B[kb]C[W dead.
])
)

(;B[rb];W[qc];B[rc];W[qe]C[B dead.
])
)

(;B[of];W[pg];B[og];W[ph];B[oh];W[pi];B[nd]
C[White continues with 'a'. White 'b' doesn't work.]LB[nc:b][oi:a]
(;W[oi];B[nc])

(;W[nc];B[mc];W[ne];B[md];W[qb];B[rb]
C[White sets up a losing ko with 'a', or dies with 'b'.]LB[pb:b][ra:a]
(;W[ra];B[pb];W[pc];B[qc];W[pa])

(;W[pb];B[rc];W[re]
C[Black continues with 'a', the vital point. Black 'b' is bad.]
LB[nb:b][ra:a]
(;B[ra]C[Black 25 is the vital point.];W[mb];B[lb];W[na];B[la])

(;B[nb]C[Black 25 is a mistake.];W[ob];B[mb];W[ra])
)
)
)
)

(;W[ne];B[oc];W[of];B[nc]
C[Black connects underneath and White cannot be proud of the result.
White's shape is bad, as White 4 is not doing anything.])
)

(;B[qf];W[pg];B[qg];W[ph];B[qh];W[pi];B[qj];W[id])
)

(;W[qc]
C[White 4 is not joseki, as Black 3 is right where White would
like to extend and Black is helped on the right.]
;B[rc]
C[White continues with 'a'. White 'b', giving Black superior thickness
to White's small life in the corner, is sometimes seen in amateur
games. 'c' doesn't repair the White mistake either.]
LB[rb:b][pc:a][qe:c]
(;W[pc];B[re]
C[The pincer at 3 is blocking White's natural extension.

White continues with 'a' or 'b', neither particularly good.]
LB[mc:b][of:a]
(;W[of];B[pg]
C[If White omits 4 and 6 and jumps to 8 directly, Black cannot 
go to 9, so White now has helped Black.]
LB[qc:4][pc:6][of:8][pg:9])

(;W[mc];B[lc])
)

(;W[rb];B[pc];W[qb];B[pd];W[rd];B[re];W[sc];B[qf])

(;W[qe];B[pd]C[Only this move is the correct punishment.];W[pe];B[pc]
C['A', 'B' don't give White a good result.]LB[re:A][oc:B]
(;W[re];B[oe])

(;W[oc];B[re]C['A' or 'B' don't give a good result.]LB[nf:A][qg:B]
(;W[nf];B[qg])

(;W[qg];B[oe])
)
)
)

(;W[tt]C[White plays elsewhere.];B[pf]
C[White may try 'a' as a preliminary to jumping to the center.
Var 2 ('b') covers White playing elsewhere again.

White cannot play c', provoking Black 'd', but White 'e' creates
a cumbersome shape, so White lacks a good move into the center.
This is the reason for not playing elsewhere.]
LB[ne:e][pg:d][of:c][cq:b][qc:a]
(;W[qc];B[rc]
C[White continues with 'a', settling himself lightly, or 'b'.

White may play 'c' as a prelude to moving out in the center,
but this is not recommended.
]
LB[rd:a][qe:b][pc:c]
(;W[rd]LB[pd:A][re:B]C['A' is correct, 'B' is questionable.
]
(;B[pd]LB[pc:A][rb:B]C['A' or 'B' are ok.
]
(;W[pc]C['A' or 'B' are ok. 'C' is questionable.
]LB[re:A][rb:B][oc:C]
(;B[re];W[rb];B[sd];W[nc];B[ne])

(;B[rb];W[re];B[qf];W[nc];B[rf];W[qb];B[ne])

(;B[oc];W[ob];B[nc];W[nb];B[mc];W[re];B[qf];W[rb])
)

(;W[rb];B[pc];W[sc];B[qb];W[rc];B[re];W[pb];B[ob];W[qa];B[oc])
)

(;B[re]
C[Black aims to keep the right side territory instead of making strength towards the center, this is a too defensive way of playing.
]
;W[pd]
C[Black plays 'a' to prevent White settling in the corner, or 'b'
to connect to Black 5.]
LB[qe:b][sd:a]
(;B[sd];W[qe];B[rd];W[of]C['A' is correct, 'B' questionable.]
LB[pg:A][og:B]
(;B[pg])

(;B[og];W[qf])
)

(;B[qe]C[Black 10 connects, but White can settle in the corner.];W[rb]
;B[sd];W[pb])
)
)

(;W[qe]
C['A' pushes White to the right side, 'B' into the corner. 'C' is a mistake.
]
LB[pd:A][pe:B][re:C]
(;B[pd];W[pe];B[oe];W[rd];B[pc];W[re];B[qb];W[of];B[ne];W[pg])

(;B[pe];W[rd];B[pd];W[rb];B[pc];W[sc])

(;B[re];W[pd];B[rd];W[of])
)

(;W[pc]C[White 7 is not recommended.];B[rb];W[mc];B[lc];W[md];B[le];
W[nf]
C[Black gets nice shape on the right and a wall at top, white White
is still not settled.])
)

(;W[tt]C[White plays elsewhere again.];B[ne];W[qc]
C[White can still make a small life in the corner.];B[rc];W[rb];B[pc];
W[qb];B[pd];W[rd];B[re];W[sc])
)

(;W[pd]
C[White 4 is not recommended.

Black continues with 'a'. Black 'b' is a mistake in direction.]
LB[qc:b][qe:a]
(;B[qe];W[qc];B[rc]
C[White continues with 'a'. White 'b' is less favorable.]
LB[qb:b][rb:a]
(;W[rb]C[White 8 is a sacrifice tesuji.];B[qb];W[pc];B[ra];W[pf]
C[White 12 creates aji to play below Black 7.];B[sb]
C[Black eliminates the aji from White 12.])

(;W[qb]
C[White 8 is not bad, it is just not as good as the nidan-bane
(2-step hane) of White 8 onto the marked point.]
MA[rb];B[qh])
)

(;B[qc]
C[Black gets a small corner while giving White superior thickness.];
W[qe];B[re];W[qf];B[rf];W[qg])
)

(;W[og];B[qf];W[ph]C[Later, Black can attack on A.]LB[of:A])

(;W[ph]C['A' or 'B'.]LB[qf:B][oe:A]
(;B[oe];W[ne];B[of];W[pd];B[qf];W[qc];B[qe];W[nc];B[rc];W[qb])

(;B[qf];W[pf];B[pg];W[qg];B[og];W[of];B[qh];W[rg];B[rf];W[rh];B[nf];
W[qc];B[qi];W[ri];B[pd];W[ne];B[ng];W[pc];B[oc];W[nc];B[ob];W[nb];
B[me];W[qj];B[pe])
)
)

(;B[kd]
C[
Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia = 3-Space High Pincer
-----------------------------------------------------------------------------

The purpose of the three-space high pincer is to maintain overall
balance. This pincer is still experimental: definitive joseki
have yet to emerge.

'A' is simple and correct. 'B', 'C' or 'D' are possible.
]
LB[of:A][pf:B][qe:C][pg:D]
(;W[of];B[qf];W[oh];B[qh];W[id];B[kf]LB[kh:A][if:B]TR[dd]
C[It's likely that White is also on the triangled point. Then, 'A' is correct, 'B' wrong.
]
;AW[dd]
(;W[kh];B[jg];W[jh]LB[ig:A][ih:B]
C['A' is correct, 'B' is an overplay.
]
(;B[ig];W[fd];B[ih]LB[ii:A][jj:B]C['A' is correct, 'B' is too shy.
]
(;W[ii];B[hi]LB[ij:A][hh:B]C['A' is correct, 'B' is an overplay.
]
(;W[ij];B[hj];W[ik])

(;W[hh];B[he]LB[gh:A][hd:B]
C['A' or 'B' don't give White a good result.
]
(;W[gh];B[hd];W[ij]
C[Black sente. White still has a weakness around A.
]LB[mh:A])

(;W[hd];B[gh];W[hg];B[gg];W[hf];B[gf];W[if];B[ie])
)
)

(;W[jj])
)

(;B[ih];W[ig])
)

(;W[if];B[kh])
)

(;W[pf]
C[Black continues with 'a'. Black 'b' is not recommended, as the
pincer stone loses its effectiveness. 

Black 'c' provokes a large scale fight.]
LB[oe:c][oc:b][qf:a]
(;B[qf]C[White continues with 'a' or 'b'.]LB[qg:b][pg:a]
(;W[pg]C[If White does not have the ladder, he plays 6.];B[qg];W[ph])

(;W[qg]C[If White has the ladder, he can play 6 here.];B[pg];W[qe];
B[rf];W[of];B[re];W[ph])
)

(;B[oc];W[pd];B[pc];W[qc];B[rc];W[qb];B[rb];W[qe];B[rd];W[nc];B[pb];
W[ob];B[qa];W[md])

(;B[oe]
C[Black 'c' was played by Kato Masao against Sakata Eio in the
30th Honinbo league playoff in 1975.]
;W[pe];B[pd];W[oc];B[ne];W[qb];B[rf];W[qg];B[rb];W[pb];B[rg];W[qi];
B[rh];W[mc];B[qh];W[ph];B[pi];W[oh];B[pj];W[le];B[ng])
)

(;W[qe];B[re];W[pe]LB[qf:A][rf:B]C['A' or 'B'.
]
(;B[qf]C['A' is correct, 'B' involves a ladder.
'C' is bad.]
LB[pf:C][rd:B][rf:A]
(;W[rf];B[rg];W[rd];B[sf];W[qc])

(;W[rd];B[rc];W[rf];B[sd];W[qg])

(;W[pf];B[qg];W[rf];B[rd];W[qh];B[pg];W[rg];B[ph];W[qi];B[oc];W[nc];
B[pc];W[nd];B[pi];W[qj];B[lf])
)

(;B[rf];W[qc];B[rc];W[pd];B[rd];W[ph];B[qb];W[hd])
)

(;W[pg];B[oe];W[ne];B[of]C['A' or 'B'.]LB[nf:B][pd:A]
(;W[pd];B[qf];W[qc];B[qe];W[nf];B[og];W[rc])

(;W[nf];B[og];W[pd];B[qf];W[qc];B[rd];W[rc])
)
)

(;B[pc]
C[
Kosumi = Ibkucha = Jian = Diagonal
-----------------------------------

Black 3 was an innovation by Kitani Minoru. The idea is to take
sente at slight disadvantage locally.

White continues with 'a' to emphasize the top.
To emphasize the right side he can use 'f' with the ladder or
'b' without it.
'c' and 'd go for influence.
'e' is possible.

'f' is a mistake.
]
LB[pe:d][og:c][pg:b][oc:a][pf:e][qe:f]
(;W[oc];B[pe]C[White continues with 'a' or 'b'.]LB[jc:b][kc:a];W[kc])

(;W[pg];B[qf];W[qg];B[pf];W[og])

(;AB[kc];W[og];B[pe];W[nf];B[qg];W[kf])

(;W[pe];B[qe];W[pg];B[qf];W[mg];B[qh])

(;W[pf]LB[pe:A][qf:B]
C['A' appears in the Chinese Fuseki.
'B' is also possible,
]
(;AW[dp][pp]AB[kc][dd];B[pe];W[oe];B[of];W[qf];B[qe])

(;B[qf];W[qg];B[pg];W[qe];B[rf];W[of]
C['A' is ok, 'B' is questionable.]LB[qh:B][re:A]
(;B[re];W[ph])

(;B[qh];W[re];B[rg];W[oc];B[rd];W[se];B[pb];W[ob];B[rb];W[kd])
)
)

(;W[qe]
C['A' and 'B' correct, 'C' gives an equal result instead of punishment.]
LB[pe:C][re:B][oc:A]
(;B[oc];W[nd];B[mc]
C[To get an equal position, White wants to play at 'A' and 'B'
at the same time.]
LB[qj:B][re:A]
(;W[re];B[pj])

(;W[qj];B[qf]C[One possible continuation.];W[re];B[of];W[pe];B[oh])
)

(;B[re];W[qf];B[rf];W[qg];B[oc];W[md];B[nd];W[ne];B[nc];W[mf];B[rg];
W[qi];B[lc]C[White's influence doesn't equal Black's territory.])

(;B[pe];W[pd]C['A' is correct, 'B' and 'C' are questionable.]
LB[re:C][qc:B][qf:A]
(;B[qf]C['A' is correct, 'B' is a mistake.]LB[re:B][qc:A]
(;W[qc];B[re];W[rd];B[qe]C['A' or 'B'.]LB[pb:B][qb:A]
(;W[qb];B[pj];W[kc]C[Later, Black play 'A' or 'B'.]LB[nf:B][mc:A]
(;B[mc];W[oc])

(;B[nf]C['A' is correct, tenuki 'B' is not recommended.]LB[dp:B][md:A]
(;W[md])

(;W[dp];B[nd]C['A' is less bad than 'B'.]LB[oe:B][oc:A]
(;W[oc];B[nc])

(;W[oe];B[oc];W[nc];B[ne])
)
)
)

(;W[pb];B[rc];W[oc];B[pj];W[kd])
)

(;W[re];B[rf];W[rd];B[qc];W[oe];B[pf];W[oc];B[rc])
)

(;B[qc]C['A' with the ladder, 'B' without.]LB[qf:B][pf:A]
(;W[pf];B[re];W[oe];B[rf])

(;W[qf];B[nc]C['A' or 'B'.]LB[of:B][nd:A]
(;W[nd];B[md];W[me];B[ld];W[oc];B[ob];W[of];B[nb];W[pj])

(;W[of];B[nd];W[ne];B[ld])
)
)

(;B[re];W[qf];B[rc];W[oc];B[pb];W[of])
)
)
)

(;B[pd]
C[
Tsuke-Atari = Headbanging
----------------------------

The thrust was an invention of Kitani Minoru and was one of his
favorite moves. 'a' and 'b' are miai.
]
LB[oc:b][oe:a]
(;W[oe];B[oc];W[nc]
C[Black continues with 'a'. Black 'b' was the first professional
experiment with this joseki.]
LB[pb:b][ob:a]
(;B[ob];W[nb];B[pf];W[jc])

(;B[pb]AB[ed][dc][cd][ce][qn][pj]AW[de][df][cf][dp][cj][pp][np]
C[Kitani played Black 7 against Wu Qingyuan = Go Seigen in game 9 of their 1941
Jubango in Kamakura. The colors are reversed from actual play.

The aim of Black 7 is to make White lose sente with succeeding
plays 8 & 10.]
;W[ob];B[pc];W[md];B[ic]C[Black gets the good extension.];W[pf]
C[White 12 is the only move.])
)

(;W[oc];B[oe];W[ne];B[of]C[White continues with 'a' or 'b'.]
LB[kc:b][md:a]
(;W[md])

(;W[kc]
C[White can play 8 here, but the possibility of Black 'a' is distasteful.]
LB[ld:a])
)
)

(;B[pe]
C[Black 3 is slow, not joseki.

White continues with 'a'. White 'b' is premature.]
LB[kc:b][qc:a]
(;W[qc]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pc:b][rc:a]
(;B[rc];W[pc];B[re];W[lc])

(;B[pc]C[Black 5 is not recommended.];W[pd];B[qb];W[qe];B[rc];W[rd];
B[qc];W[pf])
)

(;W[kc]C[White 4 is a nice extension, but premature.];B[oe];W[nd];
B[pc])
)

(;B[tt]
C[
Tenuki
-------

This variation is covered as Takamoku-Komoku.
])
)

(;W[tt]
C[
Tenuki
-------

White plays elsewhere.
'A' to 'D' are four possible shimari based on komoku.
]
LB[nd:D][nc:C][od:B][oc:A]
(;B[oc]
C[
Keima Shimari
----------------

The attack against this shimari depends on its context. Different
situations have to be treated differently:
1. Black has extensions on both sides.
2. Black has an extension on the right, White is on top.
3. White is near on the right, Black can be on top.
4. White is strong on top and right.
5. Very early in the game (usually with move nr. 6), White invades
the right side on 'E', 'F', 'G' or 'H'.
'G' also covers White being far on the right.
'I' shows, how an early White invasion can be pushed out esp.
if the middle of the right side is empty or White.
]
LB[rd:I][pj:H][qj:G][qk:F][ql:E]
(;AB[jd][pj]
C['A' and 'B' are joseki to reduce Black.
'B' is directed against a Black moyo on top.
'C' is more risky.
'D' makes sabaki on top or a ko.
'E' is wrong.
]
LB[pc:D][pe:C][nd:B][oe:A][qe:E]
(;W[oe]
C['A', 'B', 'C' are joseki.
'D' secures territory.
'E' gives White no help to make shape.
'F' is not recommended.
'G' is anxious.
'H' leaves aji of cutting.
]
LB[od:D][pe:C][nd:B][pf:A][pc:E][ne:F][mc:G][md:H]
(;B[pf]
C['A' is joseki, but White needs the ladder,
'B' is played by pros to avoid the ladder problem.
'C' and 'D' are too mild.
'E' is aji for a ko after tenuki.
]
LB[nc:A][le:B][md:C][ng:D][qc:E]
(;W[nc]
C[Black continues with 'A' or 'B'.  'B' punishes if White doesn't have the ladder.
'C' is joseki, too.
'D' helps White.
]
LB[od:D][pc:C][nd:B][nb:A]
(;B[nb];W[ob]
C[Black continues with 'A' to 'C'.
'B' depends on the ladder.
In 'C', Black yields the corner in return for thickness.]
LB[od:D][nd:C][mc:B][pb:A]
(;B[pb]
C['A' is joseki and gote. 'B' tries to force another joseki which
is sente.]
LB[pc:B][od:A]
(;W[od]C['A' or 'B' are joseki.]LB[oa:B][pc:A]
(;B[pc];W[mb];B[oa]C['A' or 'B' are correct.]LB[le:B][md:A]
(;W[md])

(;W[le];B[mc]C[Later, this move is not recommended.];W[lc];B[nd];W[ne]
;B[lb];W[kc])
)

(;B[oa];W[pc]C['A' shares, 'B' starts an all-or-nothing ko fight.]
LB[mc:B][ob:A]
(;B[ob];W[ng]PL[2];W[mc]
C[Later sente.
Black must play 'A' or White plays 'B' or 'C'.
]PL[2]
LB[pd:A][qc:B][qe:C]
(;B[pd])

(;W[qc];B[pd]LB[rb:A][pe:B][qb:C][rc:D]
C['A' is the correct tesuji for continuations on the top side.
'B' goes for the right side.
'C' and 'D' are mistakes.
]
(;W[rb]LB[qb:A][rc:B]
C['A' saves the corner and is correct, 'B' -> ko.
]
(;B[qb];W[rc];B[rd]LB[mb:A][kc:B]
C['A' threatens to capture, 'B' to go down in sente.
]
(;W[mb]LB[qa:A][jb:B]C['A' saves the corner, 'B' doesn't.
]
(;B[qa])

(;B[jb];W[qa])
)

(;W[kc]LB[ra:A][jc:B]
C['A' or 'B' give White continuations on the top side.
]
(;B[ra])

(;B[jc];W[qa];B[sc];W[ra];B[sb];W[mb];B[sd];W[ma];B[sa])
)
)

(;B[rc];W[qb];B[rd];W[mb];B[sb];W[qa];B[ra];W[sa])
)

(;W[pe];B[qe];W[rb];B[qb];W[rc];B[rd];W[qf])

(;W[qb];B[rb])

(;W[rc];B[rb])
)

(;W[qe];B[pe];W[pd])
)

(;B[mc];W[ob])
)
)

(;W[pc]C['A' is joseki, 'B' is slightly disadvantageous.]
LB[od:B][oa:A]
(;B[oa];W[od])

(;B[od];W[pd];B[nd];W[pe]C[White has continuations on A or B.]
LB[qb:B][ne:A])
)
)

(;B[mc]C['A' with a White ladder, 'B' with a Black ladder.]
LB[pc:B][nd:A]
(;W[nd];B[pb]
C[If the triangled stone is one line lower, White can try to make
himself independent of the ladder with 'A'.
With 'B', he needs the ladder.]
LB[pd:B][pi:A]TR[pj]
(;AB[qj]AE[pj];W[pi];B[of]
C[White continues with 'a'. Depending on circumstances, White can
put pressure on Black 5 and build a wall next to Black 7 with
'b'.]
LB[qi:B][nf:A]
(;W[nf];B[oh];W[mb];B[oa];W[lc];B[md];W[le])

(;W[qi];B[nf];W[mb];B[oa];W[lc];B[md];W[me];B[ld];W[kd];B[le];W[ke];
B[lf];W[kc])
)

(;W[pd];B[pc];W[mb];B[oa];W[lc]C[Aji on A.]LB[qe:A])
)

(;W[pc];B[nd];W[od]
C[Same variation as Black 11 before 7 and White 12 before 8 and
10.]
LB[pc:10][ob:8][od:12][nb:7][nd:11])
)

(;B[nd];W[mc];B[od]C[White continues with 'A' or 'B'.]LB[md:B][pb:A]
(;W[pb];B[lc];W[mb]
C[Black 18 at 'A' is unreasonable; White loses his base.]LB[md:A];
B[md];W[lb];B[kc])

(;W[md];B[pb];W[me])
)

(;B[od]C['A' is correct, 'B' is what Black wants.]LB[mb:B][pb:A]
(;W[pb];B[mb];W[qc];B[pd];W[rd];B[re];W[rc];B[rg])

(;W[mb];B[nd];W[mc];B[pb])
)
)

(;B[nd];W[od]
C[Black continues with 'A' or 'B'. 'B' punishes if White doesn't have the ladder.
]
LB[pc:B][mc:A]
(;B[mc]LB[nb:A][pc:B]C['A' is ok, 'B' is questionable.
]
(;W[nb];B[pc];W[md];B[ne];W[le];B[of];W[lc])

(;W[pc];B[nb];W[ob];B[nc]LB[qe:A][pd:B]
C['A' is slighlty better than 'B'.
]
(;W[qe];B[pe];W[pd];B[re];W[qc];B[rd];W[ne])

(;W[pd];B[qe]
C[White flees with 'A' or 'B'.
'C' takes away corner options for later.]
LB[qc:C][ne:B][of:A]
(;W[of])

(;W[ne])

(;W[qc]
C['A' or 'B' drive White out, 'C' enclose a living White corner.]
LB[ng:C][rc:B][rd:A]
(;B[rd];W[qb];B[rc];W[rb];B[sb];W[pa];B[ra])

(;B[rc];W[rb];B[rd];W[pb];B[sb];W[qa];B[oa])

(;B[ng]C[White lives on 'A', makes a ko with 'B' and dies on 'C'.]
LB[pb:C][qb:B][rb:A]
(;W[rb]C['A' or 'B' don't kill.]LB[rd:B][pb:A]
(;B[pb];W[qb];B[oa];W[rd];B[re];W[sc])

(;B[rd];W[qa];B[pb];W[oa];B[sb];W[sc];B[rc];W[sa];B[sd];W[sb])
)

(;W[qb]C['A', 'B' and 'C' force the ko.]LB[pa:C][oa:B][rd:A]
(;B[rd]C['A', 'B' -> ko.]LB[rc:B][pa:A]
(;W[pa];B[rb];W[rc];B[sc];W[sb];B[sa];W[ra];B[qa])

(;W[rc];B[oa];W[pa]C['A' or 'B' -> ko.]LB[ra:B][na:A]
(;B[na];W[ra];B[sb];W[sc];B[pb])

(;B[ra];W[na];B[ma];W[qa];B[oa])
)
)

(;B[oa];W[rd];B[re];W[sc]C['A' is correct, 'B' is wrong.]
LB[se:B][rb:A]
(;B[rb];W[ra];B[sb];W[pa];B[pb])

(;B[se];W[ra];B[pb];W[sb])
)

(;B[pa];W[oa];B[rc];W[rb];B[sb];W[rd];B[sd];W[sc])
)

(;W[pb];B[rb];W[rc];B[rd];W[sb];B[ra];W[qa];B[oa])
)
)
)
)
)

(;B[pc];W[md])
)

(;B[pc]
C['A' is joseki, 'B' is heavy.
'C' is correct, if the triangled stone is one line lower.]
LB[lc:C][nd:B][me:A]TR[jd]
(;W[me])

(;W[nd])

(;AB[jc]AE[jd];W[lc])
)

(;B[od];W[nd];B[ne];W[me];B[nf];W[ob];B[pb];W[nb]
C[White has a good position and an endgame move on A.]LB[qb:A])
)

(;W[le]PL[2]LB[nc:A][qc:B]C[Later, White continues on 'A' or 'B'.
]
(;W[nc]C[Later, White's move is independent of the ladder.
];B[nb];
W[ob];B[pb];W[od];B[pc];W[mb];B[oa])

(;W[qc]LB[le:6]C[See this move without White 6 for continuations.
])
)

(;W[md])

(;W[ng])

(;W[qc]C['A' -> ko, 'B' -> White lives.]LB[rd:B][pd:A]
(;B[pd];W[rd];B[re]C['A' -> ko, 'B' -> White dies.]LB[rc:B][rb:A]
(;W[rb];B[pb];W[qb]C['A' -> ko, 'B' -> White lives or pushes out.]
LB[sc:B][sd:A]
(;B[sd];W[sc];B[se];W[qe];B[pe];W[qf];B[rc];W[pc]
C['A' -> ko, 'B' -> White lives.]LB[sb:B][ob:A]
(;B[ob];W[rd];B[qg];W[rf];B[rc])

(;B[sb];W[ob];B[nb];W[pa];B[nc];W[ra])
)

(;B[sc];W[sd];B[qa];W[ra]
C['A' makes influence in sente, 'B' fails to kill.]LB[sb:B][qe:A]
(;B[qe];W[sb];B[se];W[rc])

(;B[sb];W[pc];B[ob];W[qe]C['A' or 'B'.]LB[qf:B][pe:A]
(;B[pe];W[qf];B[qg];W[rf];B[rg];W[se];B[sg];W[sf];B[pg])

(;B[qf];W[pe]C['A' or 'B'.]LB[od:B][rf:A]
(;B[rf];W[od])

(;B[od];W[rf])
)
)
)
)

(;W[rc]C['A' kills, 'B' and 'C' fail.]LB[pb:C][qe:B][ob:A]
(;B[ob]C['A' or 'B' fail.]LB[rf:B][qe:A]
(;W[qe];B[qf];W[pe];B[rf];W[pb])

(;W[rf];B[se];W[qe];B[qf];W[pe];B[rg];W[sd];B[sf];W[pc];B[od])
)

(;B[qe];W[pb];B[ob];W[ra])

(;B[pb];W[qe]C[Black cannot kill on 'A' or 'B'.]LB[pe:B][qf:A]
(;B[qf];W[pe];B[rf];W[nb]C[Black cannot kill on 'A' or 'B'.]
LB[ob:B][nc:A]
(;B[nc];W[pc];B[od];W[ob])

(;B[ob];W[od];B[pc];W[nc];B[qb];W[rb];B[ra];W[oa];B[sd];W[qa];B[pa];
W[qa])
)

(;B[pe];W[qf];B[qg];W[rf];B[rg];W[se];B[sg];W[sf];B[pg])
)
)
)

(;B[rd];W[pc];B[pd];W[ob];B[nc]C['A' -> life, 'B' -> ko.]
LB[rb:B][nb:A]
(;W[nb];B[mc];W[rb];B[mb];W[pa];B[na];W[qb])

(;W[rb];B[nb];W[pa];B[sb];W[qb];B[ra];W[sc];B[rc];W[sa])
)
)
)

(;B[nd]
C['A' is joseki.
'B' may be possible, but gives heavy shape if the triangled stone
is one line lower.
'C' is tricky.]
LB[rd:C][qe:B][pd:A]TR[pj]
(;W[pd]
C['A' is joseki, 'B' is bad in this position, but correct with more Black stones.
]
LB[qc:B][pc:A]
(;B[pc];W[qe];B[rd]
C['A' or 'B'.
If the triangled stone is one line lower, there are some other
moves.]
LB[qh:A]TR[pj]
(;W[qh])

(;W[oh])

(;AB[qj]AE[pj]C['A', 'B' or 'C', 'D' is bad.]
LB[qh:D][mf:C][pi:B][oj:A]
(;W[oj])

(;W[pi])

(;W[mf]C['A' is correct, 'B' and 'C' are bad.]LB[pf:C][ne:B][pg:A]
(;B[pg]C['A' is correct, 'B' strenghens Black on the wrong side.]
LB[og:B][ne:A]
(;W[ne];B[md])

(;W[og];B[oh])
)

(;B[ne];W[nf];B[of];W[og];B[pf];W[pg];B[qf];W[qg];B[rf];W[oj])

(;B[pf];W[pg];B[of];W[og])
)

(;W[qh])
)
)

(;B[qc]LB[qe:A]
C[White punishes on 'A'. The second variaton covers Black being stronger.
]
(;W[qe];B[re];W[qf];B[rf];W[qh]C[White aji on A.]LB[pc:A])

(;AE[jd][pj]AB[jc][je][qh];W[oh]TR[qh][qd]
C[White cannot cut between the two marked stones.
])
)
)

(;W[qe];B[pd];W[pe]
C['A' is correct, 'B' is correct, if the triangled stone is one
line lower..]
LB[pg:B][qg:A]TR[pj]
(;B[qg];W[pg];B[ph]LB[dp:B][oh:A]
(;W[oh]
C[Black continues with 'A' or 'B'. Regardless, White makes good.]
LB[og:B][qh:A]
(;B[qh];W[ng]C[White's invasion is a success.])

(;B[og];W[ng];B[pf];W[of];B[pg];W[mf]
C[If anything, White's position is stronger than Black's on the
right.])
)

(;W[dp];B[qh])
)

(;AB[qj]AE[pj]C['A' is correct, 'B' is wrong.]LB[qg:B][pg:A]
(;B[pg])

(;B[qg];W[pg];B[ph]C['A' is correct, temuki 'B' is not recommended.]
LB[dp:B][oh:A]
(;W[oh]C['A' or 'B'.]LB[og:B][qh:A]
(;B[qh];W[ng])

(;B[og];W[ng];B[pf];W[of];B[pg];W[mf])
)

(;W[dp]C['A' or 'B'.]LB[qh:B][pi:A]
(;B[pi])

(;B[qh])
)
)
)
)

(;W[rd]
C[Black continues with 'A' to 'D'. Black 'C' attempts to give White
a hard time in making shape. Black 'D' yields the corner for
thickness.]
LB[qe:D][pd:C][re:B][rc:A]
(;B[rc]C[White continues with 'A' or 'B'.]LB[qc:B][pd:A]
(;W[pd];B[qe];W[pc];B[qc];W[ob];B[nb];W[qb];B[ne];W[of];B[pg])

(;W[qc];B[qb];W[qe];B[pd];W[sc];B[rb];W[rf])
)

(;B[re];W[qe];B[rc];W[pd];B[qc];W[rf];B[sd];W[qg])

(;B[pd];W[qg];B[re];W[rf];B[qe];W[og])

(;B[qe]C['A' or 'B'.]LB[re:B][qc:A]
(;W[qc];B[re];W[pc];B[pd];W[rb];B[od])

(;W[re]C['A' is correct, 'B' is questionable.]LB[rc:B][qf:A]
(;B[qf];W[qc];B[pc];W[qb];B[rf];W[sc];B[se];W[ra];B[pb];W[sb])

(;B[rc];W[qf];B[pf];W[qc])
)
)
)
)

(;B[pe]
C['A' is joseki, 'B' suffers a local loss to make influence.
'C' is a mistake.
]
LB[of:B][od:A][pf:C]
(;W[od]
C['A' is joseki to attack White. 'B' secures territory on both
sides.]
LB[pc:B][nc:A]
(;B[nc]C['A' is correct, 'B' undoes one Black point less.
]
LB[pd:A][pf:B]
(;W[pd];B[pc];W[pf];B[qe]LB[ng:A][og:B]C['A' or 'B'.
]
(;W[ng])

(;W[og])
)

(;W[pf];B[pd]
C['A' or 'B' are joseki, 'C' is a variation, which is bad, if there is
an additional Black stone on the triangled position.
]
TR[nj]LB[ng:A][og:B][qf:C]
(;W[ng])

(;W[og])

(;W[qf]
C['A' or with an additional stone on the triangled position 'B'.]
LB[og:B][of:A]TR[nj]
(;B[of];W[og];B[nf];W[ng];B[mf])

(;AB[nj];B[og]C[White becomes heavy.])
)
)
)

(;B[pc]C[White continues the reduction on A and B.]LB[md:B][og:A])
)

(;W[of];B[od];W[le]
C[Black can connect only on one side with 'A' or 'B'.]LB[pf:B][lc:A]
(;B[lc];W[pf];B[qf];W[qg])

(;B[qg];W[lc])
)

(;W[pf];B[of]C[Punishment
];W[qf];B[qe]C[correct shape
])
)

(;B[od]C['A' is correct, 'B' and 'C' make White heavy.]
LB[pe:C][ne:B][qe:A]
(;W[qe]C['A' is correct, 'B' is inferior.]LB[rd:B][ne:A]
(;B[ne];W[of];B[rd];W[nf])

(;B[rd];W[me])
)

(;W[ne];B[pe])

(;W[pe];B[qe])
)

(;B[pc])

(;B[ne];W[nf];B[nd];W[mf];B[of];W[og])

(;B[mc])

(;B[md])
)

(;W[nd]
C['A' tries to secure territory.
'B' and 'C' are joseki.
'D' 
'E' is questionable.]
LB[of:E][nf:D][oe:C][od:B][nc:A]
(;B[nc]C['A', 'B' or tenuki 'C' are ok.]LB[dp:C][ld:B][md:A]
(;W[md];B[mc];W[ld];B[kb]C['A' or 'B' are ok.]LB[qe:B][pe:A]
(;W[pe];B[qe];W[pg])

(;W[qe])
)

(;W[ld]C['A' takes territory, 'B' attacks.
'C' is inferior.]
LB[ne:C][nf:B][md:A]
(;B[md];W[me];B[mc];W[lf]C['A' or 'B'.]LB[pf:B][lc:A]
(;B[lc];W[qe];B[pe];W[pf];B[oe];W[rd])

(;B[pf];W[lc])
)

(;B[nf];W[lf];B[jf])

(;B[ne];W[me]C['A' or 'B' don't help.]LB[od:B][oe:A]
(;B[oe])

(;B[od];W[nf])
)
)

(;W[dp])
)

(;B[od]C['A' is joseki.
'B' is bad.
'C' is heavy.]LB[ne:C][dp:B][nf:A]
(;W[nf]
C['A' is joseki.
'B' leaves to many possibilities for White.
Tenuki 'C' is bad.
'D' is possible.]
LB[oe:D][dp:C][md:B][ne:A]
(;B[ne];W[me];B[oe];W[mf]C['A' and 'B' are miai.]LB[pg:B][lc:A]
(;B[lc];W[pg])

(;B[pg];W[lc])
)

(;B[md]C['A' is usual, 'B' is also possible.]LB[qe:B][me:A]
(;W[me];B[mc];W[pg])

(;W[qe]C[Threatens A.]LB[oe:A])
)

(;B[dp];W[oe];B[pe];W[pf];B[qf];W[pg];B[nc];W[md];AB[qj]AE[pj];B[qg];
W[ph]C[White can cut on A or B.]LB[mc:B][qh:A])

(;B[oe];W[lg])
)

(;W[dp];B[ne])

(;W[ne]C['A' is usual, 'B' strengthens White.]LB[oe:B][mb:A]
(;B[mb]
C['A' aims for the corner or right side.
'B' makes a position on the top side.]
LB[lc:B][qe:A]
(;W[qe]C['A' secures the corner.
'B' attacks.
'C' is useless.]
LB[pe:C][pf:B][rd:A]
(;B[rd])

(;B[pf];W[rd];B[qc];W[qf];B[of])

(;B[pe];W[qf]C['A' and 'B' are miai.]LB[pf:B][rd:A]
(;B[rd];W[pf])

(;B[pf];W[rd])
)
)

(;W[lc];B[mc];W[ke])
)

(;B[oe];W[nf])
)
)

(;B[oe];W[od];B[pd];W[nc];B[ob];W[ld])

(;B[nf];W[od];B[pd];W[nc];B[ob]C['A' is correct, 'B' doesn't work.]
LB[of:B][ld:A]
(;W[ld];B[pf])

(;W[of];B[oe];W[ne];B[ng];W[pe];B[le])
)

(;B[of]C['A' or 'B'.]LB[od:B][pe:A]
(;W[pe])

(;W[od];B[pd];W[nc])
)
)

(;W[pe]
C['A' is correct.
'B', 'C' and 'D' are disadvantageous.
'D' tries to attack White, but only makes him strong.]
LB[pg:D][ne:C][pd:B][qe:A]
(;B[qe]
C['A' or, if the triangled stone is one line lower, 'B' are ok.]
LB[pg:B][pf:A]TR[pj]
(;W[pf]
C['A' is almost joseki, 'B' is similar. 'C' gives White influence
too easy.]
LB[rg:C][ne:B][nd:A]
(;B[nd];W[qf];B[nf])

(;B[ne])

(;B[rg];W[nd];B[nc];W[ld])
)

(;AB[qj]AE[pj];W[pg]C['A' is better than 'B'.]LB[pf:B][ne:A]
(;B[ne])

(;B[pf];W[of];B[qf];W[og];B[rh]C['A' or 'B' are ok.]LB[oj:B][nd:A]
(;W[nd])

(;W[oj];B[pl];W[nc])
)
)
)

(;B[pd]C['A' is correct, 'B' is heavy.]LB[oe:B][ne:A]
(;W[ne];B[md]C[A is good continuation for both.]LB[pg:A])

(;W[oe];B[nd]
C['A' or 'B'.
Even if the triangled stone is one line lower, 'C' is possible.]
LB[qh:C][qe:B][mf:A]TR[pj]
(;W[mf];B[pg])

(;W[qe];B[mf];W[qh])

(;AB[qj]AE[pj];W[qh]C['A' or 'B' are miai.]LB[qe:B][oh:A]
(;B[oh];W[qe])

(;B[qe];W[oh])
)
)
)

(;B[ne];W[qe];B[rd])

(;B[pg];W[qe];B[pd]C['A' or 'B' are ok.]LB[ne:B][oe:A]
(;W[oe];B[nd];W[ne]C['A' is correct, 'B' is questionable.]
LB[me:B][md:A]
(;B[md];W[ng])

(;B[me];W[mf];B[le];W[rd];B[rc];W[qc])
)

(;W[ne];B[md];W[ng])
)
)

(;W[pc];B[pd];W[ob]
C['A' defends the corner.
'B' makes the corner a ko.]LB[nc:B][pb:A]
(;B[pb];W[nc];B[od];W[lc])

(;B[nc];W[qc]C['A' or 'B' are correct.
'C' is a mistake.]
LB[rc:C][nb:B][rd:A]
(;B[rd]C['A' -> ko, 'B' -> White dies.]LB[nb:B][rc:A]
(;W[rc];B[nb];W[oa]C['A', 'B' or 'C' make ko.]LB[qa:C][rb:B][sc:A]
(;B[sc];W[sb];B[ra];W[qa];B[qb];W[pb];B[pa])

(;B[rb];W[sb];B[qb];W[pb]C['A' or 'B'.]LB[ra:B][qa:A]
(;B[qa];W[ra];B[sa])

(;B[ra];W[qa];B[pa])
)

(;B[qa];W[ra];B[rb];W[sb];B[sa])
)

(;W[nb];B[mb];W[rc];B[na];W[pa];B[sc];W[sb];B[ra])
)

(;B[nb];W[rd];B[re];W[rb];B[sd];W[sc];B[rc])

(;B[rc];W[rb];B[rd];W[nb];B[mb];W[sb])
)
)

(;W[qe];B[qg])
)

(;AB[qj]AW[jc]
C['A' is usal.
'B' is a test move which can be applied if the Black position
is tighter.]
LB[qc:B][rd:A]
(;W[rd]
C[Black defends the corner with 'A' or 'C' or takes outside influence
wirh 'B'. The aim of Black 'C' is to avoid giving White any help
in making shape. 
'D' and 'E' are disadvantageous.]
LB[qc:E][re:D][pd:C][qe:B][rc:A]
(;B[rc]C['A' is correct, 'B' makes a base.]LB[qe:B][pd:A]
(;W[pd];B[qc];W[pf];B[qe];W[nf]LB[nc:A])

(;W[qe];B[pd];W[qh];B[oj];W[ql];B[oh]
C[This continuations shows ways for White to live.];W[rj]
C['A' or 'B'.]LB[ri:B][rk:A]
(;B[rk];W[pi];B[pj];W[ri];B[qk];W[re];B[pf];W[rg])

(;B[ri];W[qi];B[rk];W[pj];B[qk];W[pk];B[pi];W[rh];B[pl];W[ok];B[qm];
W[si];B[rl];W[nk])
)
)

(;B[qe]
C['A' is correct. 'B' is inferior, because he ends in gote, but
may be necessary, if escaping outside has become impossible.]
LB[qc:B][re:A]
(;W[re]C['A' or 'B'.]LB[rc:B][rf:A]
(;B[rf];W[qc];B[pc];W[qb]
C['A' is usual.
'B' initiates a ko where Black has to find the first ko threat.
If White wins the ko, Black has suffered a big damage in terms
of territory and endgame.]
PL[2]LB[sc:B][se:A]
(;B[se];W[sc];B[sf];W[ra];B[pb];W[sb]
C[Now the triangled White stone shows its value: When the circled
liberty is lost ( what is double-sente), Black must defend the
cut at A.]
LB[qf:A]TR[re]CR[sd])

(;B[sc];W[sb];B[rb];W[rc];B[sa];W[ra];B[qa];W[pb];B[ob];W[pa];B[oa];
W[ra]C[Many local ko threats for White starting on the marked point.]
TR[qf])
)

(;B[rc];W[qf]C['A' or 'B'.]LB[of:B][qh:A]
(;B[qh]C['A' or 'B' are ok.]LB[qg:B][of:A]
(;W[of])

(;W[qg];B[ph];W[of])
)

(;B[of];W[qh])
)
)

(;W[qc]C[Black continues with 'A' or 'B'.]LB[re:B][pc:A]
(;B[pc]C[White continues with 'A' or 'B'.]LB[re:B][qb:A]
(;W[qb];B[re];W[sc]C['A' and 'B' are correct, 'C' is a mistake.]
LB[pb:C][ra:B][se:A]
(;B[se]C['A' is correct, 'B' is questionable.]LB[pb:B][ra:A]
(;W[ra];B[pb];W[sb])

(;W[pb];B[ob]C['A' is necessary, tenuki 'B' is a mistake.]
LB[dp:B][ra:A]
(;W[ra];B[pa];W[sb])

(;W[dp];B[ra];W[rb];B[sb];W[sa];B[sd];W[qa];B[rc]C[Ko])
)
)

(;B[ra];W[rb];B[se];W[sa];B[sd];W[rc];B[pb];W[qa])

(;B[pb];W[rb]C[White has two points more than necessary.])
)

(;W[re];B[rc]C[White continues with 'A' or 'B'.]LB[qb:B][qf:A]
(;W[qf];B[pf];W[qg];B[pg];W[ri];B[qi];W[qh];B[ph];W[rj];B[qk])

(;W[qb];B[rb];W[qf];B[pf];W[pg];B[of];W[rg])
)
)

(;B[re];W[pc]LB[od:A][ob:B]TR[oe]
C['A' is correct now. If Black has additional stones, e.g. a stone on the triangled position, he kills on 'B'.
]
(;B[od]C['A' lives with a threat to connect outside. 'B' makes a ko.]
LB[rb:B][ob:A]
(;W[ob];B[nb];W[pb]
C['A' lets White live.
'B' tries to kill but here White can escape to the top.]
LB[rb:B][mc:A]
(;B[mc];W[rc])

(;B[rb];W[rc];B[sd];W[mb];B[nc];W[na])
)

(;W[rb];B[sd];W[sc];B[rc])
)

(;AB[oe];B[ob])
)
)
)

(;B[pd];W[re];B[rc];W[qh])

(;B[re];W[qe]
C['A' is the usual continuation.
If on the right side, there is no Black, but a White stone, 'B'
is better.
If the right side stone is closer, 'C' si good.
]
LB[qf:B][rc:A][pe:C]
(;B[rc];W[pd];B[qc];W[rf];B[sd]
C[If Black wanted the corner, he could have taken it without giving
White influence.
'A', 'B' or 'C'.]
LB[pi:C][og:B][nf:A]
(;W[nf]LB[nc:A])

(;W[og]C[Playing White 14 at 'A' or 'B' would be too heavy.]
LB[qf:B][pf:A];B[qf];W[qg];B[pe];W[oe];B[rg];W[pf];B[sf];W[qh])

(;W[pi])
)

(;AE[qj]AW[qi];B[qf];W[pe];B[rc];W[pd];B[qc];W[rf];B[sd])

(;AE[qj]AB[qh];B[pe];W[qf];B[rf];W[pd];B[qc];W[pf];B[qg];W[oe];B[pc])
)

(;B[qc]C['A' or 'B'.]LB[qh:B][qe:A]
(;W[qe]C[Black continues with 'A' to 'C'.]LB[pe:C][rc:B][qg:A]
(;B[qg];W[rc]C[Black continues with 'A' or 'B'.]LB[pe:B][rb:A]
(;B[rb]LB[oe:B][qf:A]
(;W[qf];B[pg];W[pd];B[pc];W[sb];B[qb];W[of])

(;W[oe])
)

(;B[pe];W[qf];B[pf];W[rg];B[rh];W[rf];B[pg];W[rb])
)

(;B[rc];W[qh])

(;B[pe];W[qf];B[pf];W[rc];B[rb];W[pd]
C[There may be a ladder associated with White 14. Black continues
with 'A' or 'B'.]
LB[qb:B][pc:A]
(;B[pc];W[sb];B[qb];W[qg];B[pg];W[ri])

(;B[qb];W[pg];B[qg];W[ph]C[With a White ladder, 'A' and 'B' are miai.]
LB[rg:B][oe:A]
(;B[oe];W[rg])

(;B[rg];W[oe])
)
)
)

(;W[qh]C['A' or 'B'.]LB[oi:B][qf:A]
(;B[qf];W[oh])

(;B[oi];W[qe])
)
)
)

(;W[qc]C['A' or 'B' are possible. 'B' makes a ko.]LB[pd:B][pc:A]
(;B[pc];W[rd]C['A' kills lwaving aji. 'B' -> White lives.]
LB[qe:B][rc:A]
(;B[rc])

(;B[qe];W[qb])
)

(;B[pd];W[rd];B[re];W[pb];B[ob];W[rb];B[sd];W[sc])
)
)

(;AW[qf][qi];W[oe]C['A' is correct, 'B' is questionable.]
LB[nd:B][mc:A]
(;B[mc];W[pc];B[pd];W[od];B[ob];W[rc];B[rd];W[qc];B[rb];W[re];B[sc];
W[pe]C['A' is correct, 'B' is inferior.]LB[qb:B][sb:A]
(;B[sb];W[qe];B[sd])

(;B[qb];W[qe];B[pb]C[Black unnecessarily lost one point territory.])
)

(;B[nd];W[ne]C['A' is slow, 'B' is inferior, 'C' doesn't work.]
LB[me:C][ld:B][md:A]
(;B[md])

(;B[ld];W[pc];B[pd];W[od];B[ob];W[rc];B[rd];W[qc];B[rb];W[re];B[sc];
W[pe];B[sb];W[md])

(;B[me];W[mf];B[le];W[pc];B[pd];W[od];B[nc];W[qc];B[rc];W[rb];B[rd];
W[sb];B[ob];W[qb];B[pb];W[re];B[qa];W[sd];B[ra];W[qe];B[pa];W[sc];
B[sa];W[pe])
)
)

(;AW[jc][mc][qf][qi]
C[Black can secure his group on 'A'. If he doesn't care for the
shimari, it will suffer after White 'B'.]
PL[2]LB[pc:B][oe:A]
(;B[oe])

(;W[pc];B[pd];W[qc]C['A' is correct, 'B' and 'C' are mistakes.]
LB[nc:C][ob:B][od:A]
(;B[od];W[rd];B[re];W[rc];B[qe];W[rf];B[se];W[ob];B[nb];W[pb];B[nc];
W[mb];B[na];W[ra])

(;B[ob];W[rd];B[re];W[rc];B[qe];W[od])

(;B[nc];W[od];B[md];W[nd])
)
)

(;W[ql];B[qj];W[qh]C[Black continues with 'a' or 'b'.]LB[pi:b][oj:a]
(;B[oj]C[ikken tobi (1-space jump)];W[oh];B[ol];W[mh])

(;B[pi]C[White continues with 'a' or 'b'.]LB[qe:b][og:a]
(;W[og];B[qf];W[ph];B[oi];W[mg];B[mi])

(;W[qe]C[Black continues with 'a' to 'c'.]LB[re:c][pe:b][pd:a]
(;B[pd];W[rd];B[rc];W[og];B[ni];W[mg])

(;B[pe]C[White continues with 'a' to 'c'.]LB[rd:c][pf:b][qf:a]
(;W[qf];B[rd];W[og])

(;W[pf]
C[Black continues with 'a'. Black 'b' does not work, as it gives
White a large corner.]
LB[qf:b][oe:a]
(;B[oe];W[rd]
C[Black continues with 'a'. Black 'b' lets White live in the corner,
a less satisfactory result for Black.]
LB[qf:b][re:a]
(;B[re];W[qf];B[rc];W[of])

(;B[qf]C[White lives in the corner; a success for White.];W[re];B[pg];
W[qc])
)

(;B[qf]C[Black 10 gives White the corner in a big way.];W[re];B[pg];
W[of];B[qg];W[og];B[oh];W[nh];B[ph];W[pd];B[oe];W[od];B[ne];W[nd];
B[me];W[qc];B[md];W[nc];B[mc];W[nb])
)

(;W[rd]C[Black continues with 'a' or 'b'.]LB[re:b][pd:a]
(;B[pd];W[qf];B[rc];W[og])

(;B[re];W[qf]C[Black continues with 'a' or 'b'.]LB[rf:b][rc:a]
(;B[rc];W[pd];B[qc];W[rf]C[White continues with 'a' or 'b'.]
LB[oe:b][sd:a]
(;B[sd];W[oe];B[pf];W[og])

(;B[oe];W[og])
)

(;B[rf]C[White continues with 'a' or 'b'.]LB[pf:b][pd:a]
(;W[pd];B[qc];W[oe]C[Black continues with 'a' or 'b'.]LB[qg:b][pf:a]
(;B[pf];W[qg];B[pc]C[White continues with 'a' or 'b'.]LB[og:b][of:a]
(;W[of];B[pg];W[ph];B[og];W[oh];B[ng];W[pk])

(;W[og];B[of];W[nf];B[od];W[oh])
)

(;B[qg];W[pf];B[pg];W[og];B[ph];W[pc];B[qb];W[pb])
)

(;W[pf];B[pd];W[ph];B[rc];W[oi];B[oj];W[nj];B[ok];W[nk];B[ol];W[qi];
B[pj];W[ni])
)
)
)
)

(;B[re];W[rd]C[Black continues with 'a' or 'b'.]LB[rc:b][rf:a]
(;B[rf];W[pd];B[qc];W[pc];B[qb];W[od];B[qf];W[md])

(;B[rc];W[pd];B[qc];W[rf];B[sd];W[og];B[qf];W[qg];B[pe];W[oe])
)
)
)
)

(;W[qk];B[qi];W[qg];B[ph];W[qe]C[Black continues with 'a' to 'd'.]
LB[re:d][rd:c][pe:b][pd:a]
(;B[pd];W[of];B[nh];W[mf])

(;B[pe];W[rd]C[Black continues with 'a' or 'b'. 'b' may create a ko.]
LB[qc:b][re:a]
(;B[re];W[qf];B[rc];W[pd];B[qc];W[oe]
C[Black continues with 'a' or 'b'. Black 'a' is better.]LB[og:b][pf:a]
(;B[og];W[of];B[mg];W[me])

(;B[pf];W[pg];B[of];W[og];B[nf])
)

(;B[qc]
C[White continues with 'a' or 'b'. 'a' creates a ko. With 'b',
White sacrifices to get out to the center.]
LB[rc:b][pf:a]
(;W[pf];B[re];W[rf])

(;W[rc];B[rb];W[qf];B[sc];W[og];B[re];W[of])
)
)

(;B[rd];W[oe];B[nd];W[mf])

(;B[re];W[rd];B[rc];W[pd];B[qc];W[rf];B[sd];W[pg];B[oh];W[nf])
)

(;W[qj]C['A' Black approach.
'B' White continuation.]LB[dp:B][qh:A]
(;B[qh];W[qf];B[pg];W[pe]
C[Black continues with 'a' or 'b'. In either variation, White gets
out to the center.

White breaks through, unfavorable to Black, if Black plays 'c'.]
LB[ne:c][of:b][pd:a]
(;B[pd]C[tsuke (attach)];W[oe];B[ng];W[me];B[mc];W[lf])

(;B[of]C[Black 8 does not capture White.];W[pd];B[pc];W[qc]
C[Black continues with 'a' or 'b'.]LB[rc:b][rd:a]
(;B[rd];W[ne]C[White aims at A later.]LB[qb:A];B[oe]
C[The cut doesn't work.];W[od];B[nd];W[nc];B[md];W[ob])

(;B[rc];W[qb];B[rd];W[qe];B[rb]
C[White escapes on 'A'.
'B' is a mistake. Altough White can live or escape after 'B',
he will get a small group for large influence or be hunted.]
LB[nd:B][ne:A]
(;W[ne];B[oe]C[The cut doesn't work];W[od];B[nd];W[nc];B[md];W[ob])

(;W[nd];B[od];W[oe];B[ne];W[nf];B[me];W[rh]
C[Black develops both sides on 'A', makes thickness on 'B'.
'C' splits White into two weaks groups.]
LB[qi:C][ri:B][rg:A]
(;B[rg];W[qg];B[ri];W[ph];B[qi];W[og];B[pi];W[oh];B[mf];W[ng]
C[White has a small overconcentrated group while Black developed
all around.])

(;B[ri];W[qi];B[qg];W[rg];B[rf]C['A' is correct, 'B' is a mistake.]
LB[og:B][re:A]
(;W[re];B[mg]C[Black has huge thickness.];W[ng]
C[Safing this stone is very bad, as Black gets many sente moves
and huge thickness.]
;B[nh];W[og];B[oh];W[pf];B[ph];W[sf];B[mf];W[of];B[sd];W[rj];B[se];
W[rf];B[mh])

(;W[og];B[re];W[pf];B[of])
)

(;B[qi];W[ri];B[rg]C['A' gives a bad result.
'B' is self-deletion.]
LB[qg:B][og:A]
(;W[og]C['A' is correct, 'B' is bad and depends on the ladder.]
LB[pf:B][qg:A]
(;B[qg];W[pf];B[oi])

(;B[pf];W[qg];B[ph];W[oh];B[pi];W[pj];B[oi]
C[If White has the ladder, his result after 'A' is ok. If he hasn't,
he gives Black huge thickness on 'B'.]
LB[oj:B][ni:A]
(;W[ni];B[oj];W[ok])

(;W[oj];B[ni];W[rf])
)
)

(;W[qg];B[rf]
C[White can choose between three disasters 'A', 'B' or 'C'.]
LB[og:C][pi:B][ph:A]
(;W[ph];B[pi];W[oh];B[re];W[og];B[pf])

(;W[pi];B[ph];W[og];B[re];W[pf];B[of])

(;W[og];B[re];W[pf];B[of])
)
)
)
)
)

(;B[ne];W[of];B[mg];W[od];B[nd];W[pc];B[pd];W[oe];B[pb];W[nc];B[qc];
W[ob];B[pc];W[og];B[oh];W[mf];B[le];W[nh];B[ng];W[nf];B[lf];W[me];
B[md];W[ld];B[mc];W[lg])
)

(;B[dp]C[White 'A' or 'B' are ok.]LB[rd:B][qe:A]
(;W[qe]
C[White prevents Black going outside and gets the side, not the
corner.]
;B[pe];W[qf];B[rd];W[pf];B[oe])

(;W[rd];B[re];W[qe];B[pe];W[qf];B[rf];W[qg];B[rg];W[qh];B[qc])
)
)

(;W[pj];B[dp];W[qf];B[qh];W[ph]
C['A' is correct, 'B' depends on the ladder.]LB[pi:B][qi:A]
(;B[qi];W[pi];B[qj];W[qk];B[qg];W[pg];B[rf];W[pf]C['A' or 'B'.]
LB[rk:B][re:A]
(;B[re])

(;B[rk]
C[This move was invented by Cho Hun Hyeon in the 1st Ing Tournament
against Nie Weiping 1989. Its purpose is disable White territory
on the lower right.]
;W[re];B[ql];W[pk];B[sg];W[qe];B[lc])
)

(;B[pi]C['A' with the ladder, 'B' if Black has the ladder.]
LB[oi:B][qi:A]
(;W[qi];B[oi];W[rh];B[qj];W[qg];B[ri];W[qh];B[pk])

(;W[oi];B[qi];W[pg];B[qj];W[pk];B[ql])
)
)

(;W[rd];B[re];W[qe];B[pe];W[qf];B[rf];W[qg];B[rg];W[qh];B[qc]
C['A' or 'B' depending on the context.]LB[qj:B][rh:A]
(;W[rh])

(;W[qj]PL[2];W[pd]
C[Later, White can play here.
'A' is correct, 'B' wrong]LB[oe:B][pc:A]
(;B[pc])

(;B[oe];W[rh]C[Now this is sente.];B[rc])
)
)
)

(;B[od]
C[
Ikken-Tobi Shimari
---------------------

'A' to establish or enlarge a White position on the right side.
'B' is the usual approach from the top side.
'C' to make a White position on top, if Black prefers to defend
the corner, an empty top side is necessary.
'D' covers invasions if Black has a larger moyo based on this
shimari.
]
LB[dp:D][pc:C][mc:B][qe:A]
(;W[qe]
C['A' is joseki, 'B' doesn't want to help White, but takes less
points.
'C' is not recommended.
With a White stone on a triangled position, 'D' is possible.
'E' is not recommended.]
LB[rd:E][pc:D][re:C][pd:B][pe:A]TR[lc][mc]
(;B[pe];W[qf]
C['A' is joseki, 'B' is a special strategy taking the center for
the side.
'C' is necessary with a White stone on the triangled position.]
LB[pc:C][pg:B][rd:A]TR[mc]
(;B[rd];W[pf]
C['A' is joseki. 'B' is a variation to prevent a White stone on
top.
'C' is also possible.]
LB[qj:C][lc:B][of:A]
(;B[of];W[og]
C['A' is joseki, 'B' a variation which is somewhat inferior.]
LB[ng:B][nf:A]
(;B[nf]C['A' or 'B' are joseki]LB[mc:B][ng:A]
(;W[ng];B[mf]C['A' is joseki, 'B' is possible, 'C' is too near.]
LB[lc:A][kc:B][mc:C]
(;W[lc]
C['A' is necessary, tenuki 'B' makes all Black efforts useless.]
LB[dp:B][mb:A]
(;B[mb]C[End of joseki
Later White continuations on 'A' or 'B'.]
LB[pc:B][mg:A]
(;W[mg];B[lf])

(;W[pc];B[pd];W[lb]
C['A' is necessary, tenuki 'B' loses much territory.]LB[dp:B][mc:A]
(;B[mc])

(;B[dp];W[nc])
)
)

(;B[dp];W[pc];B[pd];W[oc])
)

(;W[kc])

(;W[mc];B[kc])
)

(;W[mc]C['A' is joseki, 'B' is a mistake.]LB[kc:B][nb:A]
(;B[nb];W[ng];B[mf]C[End of joseki.];W[pc]C[Later continuation,];B[pd]
;W[nc];B[oc];W[mb])

(;B[kc];W[pc]C['A' -> seki in sente, 'B' -> White lives.]
LB[pd:B][oc:A]
(;B[oc]C['A' seki, 'B' life or escape.]LB[ob:B][pd:A]
(;W[pd];B[oe];W[pb];B[ob];W[rb];B[rc];W[qb];B[sb];W[ra];B[pa])

(;W[ob];B[pd];W[qb];B[qc];W[pb];B[rb];W[nc]
C['A' closes White in, 'B' drives White out.]LB[lb:B][ld:A]
(;B[ld];W[lb];B[kb];W[na])

(;B[lb];W[mb];B[ma];W[na];B[la];W[lc];B[kb];W[kd])
)
)

(;B[pd];W[oc]C['A' is correct, 'B' is a mistake.]LB[ld:B][ng:A]
(;B[ng]
C[White must strenghen his corner somewhere like 'A', noit play
'B'.]
LB[oh:B][qb:A]
(;W[qb];B[oh])

(;W[oh];B[ld]C['A' or 'B' don't help.]LB[rb:B][md:A]
(;W[md];B[qb])

(;W[rb];B[nb])
)
)

(;B[ld];W[md];B[le];W[rb])
)
)
)
)

(;B[ng]
C[The move was played by Sakata Eio against Wu Qingyuan = Go Seigen 
1953 to get sente on the top site, but is not as good than Black 
11 on A.
'A' is correct, 'B' is submissive, 'C' is not recommended, regardless
a White stone on the triangled position.]
LB[pc:C][oh:B][nf:A]TR[lc]
(;W[nf];B[oe]C[No more threat on A.]LB[pc:A];W[oh]
C['A' is correct, 'B' makes useless thickness.]LB[mf:B][kc:A]
(;B[kc];W[mf];B[md]C[The triangled Black stone is now too close.]
TR[kc])

(;B[mf];W[nh];B[mg];W[lc])
)

(;W[oh];B[nf];W[lc];B[mb]C[Black can aim at A.]LB[qh:A])

(;W[pc]C['A' is correct, 'B' is what White wants.]LB[pd:B][oc:A]
(;B[oc];W[oh];B[oe])

(;B[pd];W[nf];B[oe])
)

(;AW[lc];W[pc];B[oe]C['A' or 'B' don't give a good result.]
LB[oh:B][oc:A]
(;W[oc];B[pg];W[qg];B[oh];W[pd]C[Not recommended.];B[qc]
C[Black has influence and lives in the corner.])

(;W[oh];B[oc];W[ob];B[nb];W[pb];B[mc];W[pd];B[qc];W[qb];B[rb];W[re];
B[sc];W[se];B[sd];W[ra];B[sb];W[qa];B[oa])
)
)
)

(;B[lc];W[ne];B[md])

(;B[qj]C['A' is correct, 'B' is possible..]LB[ne:B][mc:A]
(;W[mc]C['A' is correct, 'B' is questionable.]LB[ne:B][oc:A]
(;B[oc];W[ne])

(;B[ne];W[pc])
)

(;W[ne];B[mc])
)
)

(;B[pg];W[rd];B[qc]C['A' or 'B' are ok.]LB[rc:B][rh:A]
(;W[rh];B[pi]C[Defends against White A.]LB[pf:A])

(;W[rc])
)

(;AW[mc]
C[The triangled stone has the same effect on the squared position.]
TR[mc]MA[lc];B[pc];W[pf];B[of];W[og];B[nf])
)

(;B[pd];W[qh]C[Later White continues on A and B.]LB[kc:B][re:A])

(;B[re];W[rf];B[pe];W[qf];B[rd];W[pf];B[of];W[og];B[nf];W[ng];B[mf];
W[lc];B[mb])

(;AW[mc];B[pc];W[pe];B[rd])

(;B[rd];W[pe]C['A' or 'B'.]LB[oe:B][pd:A]
(;B[pd];W[pi])

(;B[oe];W[pg]C['A' is correct, 'B' is a mistake.]LB[of:B][pd:A]
(;B[pd];W[of];B[nf];W[ng];B[mf];W[mg];B[lf];W[kd])

(;B[of];W[pd];B[pc];W[qc];B[rc];W[oc];B[qb];W[nc]
C[Black heavy in the center.])
)
)
)

(;W[mc]LB[nb:A][oc:B]
C['A' secures territory and takes away White's base. 'B' is better for as preparation for a laterattack.
]
(;B[nb];W[nc];B[ob]C[Black aims at A.]LB[kc:A])

(;B[oc];W[jc])
)

(;W[pc]
C['A' is correct. 'B' is also possible.
C shows the variation with White stones in the surrounding.]
LB[dp:C][oc:B][pd:A]
(;B[pd]C[White goes outside with 'A' or makes a ko on 'B'.]
LB[qc:B][oc:A]
(;W[oc];B[qc];W[mc]C[A is now a big continuation for both.]LB[nd:A])

(;W[qc]C['A' makes a ko, 'B' fails.]LB[rc:B][oc:A]
(;B[oc]C['A' makes the ko, 'B' dies.]LB[rb:B][rd:A]
(;W[rd];B[re]
C['A' -> ko, With an additional stone on the triangled position,
White lives on 'B'.]
LB[rc:B][rb:A]TR[qh]
(;W[rb];B[sd];W[sc])

(;AW[qh];W[rc];B[pb];W[qb];B[ob];W[rf];B[se];W[sd];B[qf];W[sb])
)

(;W[rb];B[rd];W[ob];B[nb];W[qa];B[pb];W[oa];B[rc];W[qb];B[sb])
)

(;B[rc];W[rb];B[rd]C['A' is correct, 'B' dies.]LB[sb:B][nb:A]
(;W[nb]C['A' is correct, 'B' is questionable.]LB[sb:B][nc:A]
(;B[nc]C['A' is necessary, 'B' is a mistake.]LB[mb:B][ob:A]
(;W[ob];B[lc];W[mb];B[lb];W[sb])

(;W[mb];B[ob]C['A' or 'B' don't help,]LB[pb:B][oc:A]
(;W[oc];B[qb])

(;W[pb];B[pa])
)
)

(;B[sb];W[qb];B[mc];W[mb];B[lc])
)

(;W[sb];B[ob];W[oc];B[nc];W[pb];B[pa];W[qb];B[nb])
)
)
)

(;B[oc];W[qc];B[rd];W[pd];B[pe];W[ob];B[nb];W[rc]
C['A' is usual. 'B' is correct with more Black surrounding stones.]
LB[pb:B][qf:A]
(;B[qf];W[oa]C[ko])

(;B[pb];W[qb];B[oa]C[bad aji on A]LB[qe:A])
)

(;AW[mc][qg][qj]C['A' is correct, 'B' and 'C' are mistakes.]
LB[pd:C][oc:B][qf:A]
(;B[qf];W[oc];B[pg]
C['A' or 'B', depending on the further surrounding stones.]
LB[qc:B][qh:A]
(;W[qh];B[qc];W[rf];B[re];W[pf];B[qe])

(;W[qc];B[qh])
)

(;B[oc];W[pd];B[pe];W[qc]C['A' or 'B' are no help.]LB[oe:B][qe:A]
(;B[qe];W[ob];B[nb];W[pb];B[nc];W[oe])

(;B[oe];W[ob];B[nb];W[pb];B[nc];W[re])
)

(;B[pd];W[oc];B[qc];W[nd])
)
)

(;W[dp]
C[Several cases:
- Black on 'A',
- Black on 'A', E and the triangled position,
- Black on 'C',
- Black on 'D' and some more stones.
- Black on D and E,
- Black on 'E' and G,
- Black on 'F' and G.
]
LB[qj:E][lc:D][kc:C][jc:A][pj:F][pp:G]TR[oj]
(;AB[jc]C['A', 'B' or 'C' are ok.
'D' is a mistake.]PL[2]
LB[qc:D][kd:C][mc:B][lc:A]
(;W[lc];B[kd]C['A' makes a living group, 'B' prevents being enclosed.]
LB[nd:B][ld:A]
(;W[ld];B[le];W[me];B[md];W[nd]
C['A', closing White in in sente, is correct.
'B' is a mistake.]
LB[mc:B][ne:A]
(;B[ne];W[mc];B[mf];W[oc];B[md];W[nc];B[pc];W[oe];B[pd];W[ke];B[me];
W[jb];B[ib];W[kb];B[ic];W[pb];B[qb];W[oa])

(;B[mc];W[nc];B[mb];W[ne];B[lb];W[lf];B[ke];W[pf])
)

(;W[nd]C['A' is usual. 'B' makes both sides stronger.]LB[ne:B][nc:A]
(;B[nc];W[ld];B[ne];W[le])

(;B[ne];W[oc];B[pc];W[oe];B[pd];W[ld];B[nf];W[le])
)
)

(;W[mc];B[ld];W[pc]C['A', 'B' or 'C' enclose a White group.]
LB[pd:C][qc:B][oc:A]
(;B[oc];W[pd];B[pe];W[qc];B[qe];W[ob];B[nb];W[pb];B[nc];W[rc]
C[White aji to cut at A.]LB[oe:A])

(;B[qc];W[lc];B[kd];W[pd];B[pe];W[oc];B[nd];W[qb];B[rb];W[qe];B[pf];
W[pb];B[qf];W[ra];B[rc];W[jb];B[ib];W[kb];B[ic])

(;B[pd];W[qc];B[oc];W[ob];B[nb];W[pb];B[nc];W[rd];B[re];W[rc])
)

(;W[kd])

(;W[qc];B[pc])
)

(;AB[jc][oj][qj]PL[2];W[pc]
C[If a White reduction against the moyo is too small, White must
try to do more damage by an invasion here.
'A' forces a ko. 'B' gives White the choice.
'C' gives life.]
LB[qc:C][pd:B][oc:A]
(;B[oc];W[qc];B[rd];W[pd];B[pe];W[ob];B[nb];W[qb];B[oa];W[pa])

(;B[pd]C['A' -> ko.
'B' -> White lives.]LB[oc:B][qc:A]
(;W[qc];B[oc];W[rd];B[re];W[rb];B[sd];W[sc])

(;W[oc];B[qc];W[lc];B[kd];W[ld];B[le];W[jb];B[ib];W[kb];B[ic];W[nc])
)

(;B[qc];W[lc];B[kd];W[oc];B[pd];W[ld];B[le];W[jb];B[ib];W[kb];B[ic];
W[nc])
)

(;AB[kc]AW[ic]PL[2];W[mc]PL[2]LB[ld:A][pc:B]
C[Black play 'A' or tenuki, after which White enters on 'B'.
]
(;B[ld];W[pc]C['A', 'B' or 'C' enclose White.]LB[pd:C][qc:B][oc:A]
(;B[oc];W[pd];B[pe];W[qc];B[qe];W[ob];B[nb];W[pb];B[nc];W[rb]
C[White aji on A.]LB[oe:A])

(;B[qc];W[md];B[me];W[kb];B[jb];W[lb];B[jc]C['A' or 'B'.]
LB[ib:B][oc:A]
(;W[oc]
C['A' is usual.
'B' gives more points for sente and more influence and leaves
a cut.]
LB[nd:B][pd:A]
(;B[pd];W[nb])

(;B[nd];W[pd];B[pe];W[qe];B[pf];W[qb];B[rb];W[pa];B[qf];W[ra];B[rc];
W[nc]C[White aji to cut at A.]LB[le:A])
)

(;W[ib];B[ja];W[ne];B[nd];W[le];B[mf];W[kd];B[lc];W[jd];B[mb];W[nc];
B[nb];W[oc];B[la];W[pd])
)

(;B[pd]C['A' takes the corner. 'B' is also possible.]LB[oc:B][qc:A]
(;W[qc];B[oc];W[ob];B[nb];W[pb];B[nc];W[rd];B[re];W[rc])

(;W[oc];B[qc];W[md];B[me];W[kb];B[jb];W[lb];B[jc];W[nb])
)
)

(;W[pc];B[oc];W[ob]LB[pd:A][nb:B]
C['A' influences the right, 'B' the top side.
]
(;B[pd];W[qb];B[ke]PL[1]LB[nc:A][qc:B]
C[White lives on 'A', or Black aims to kill on 'B'.
]
(;W[nc];B[qc];W[pb])

(;B[qc];W[pb];B[rb];W[nc];B[lb])
)

(;B[nb];W[pb];B[nc];W[pd];B[pe];W[qe];B[qc];W[qb];B[rb];W[oe];B[pf];
W[na]C['A' is better than 'B'. 'C' fails completely.
]
LB[mb:A][ma:B][qa:C]
(;B[mb];W[ra];B[rc];W[re];B[pa];W[qa];B[ma];W[rd];B[oa];W[na];B[oa];
W[sc])

(;B[ma];W[mb];B[oa];W[nd];B[na];W[la])

(;B[qa];W[nd])
)
)
)

(;AB[lc][qh]AW[qj][pn][pp]PL[2];W[qc]
C[White makes a probe to get sente in his attack from the other
side.
'A' is correct, 'B' is a mistake.]
LB[rd:B][pc:A]
(;B[pc];W[rd];B[rc];W[ph];B[pg];W[oh];B[qi];W[pj]
C[Defending with 'A' is necessary.
After tenuki 'B' White damages Black's position using White 5.]
LB[qc:5][dd:B][pf:A]
(;B[pf])

(;B[dd];W[qe];B[qb];W[qg])
)

(;B[rd];W[pc];B[oc];W[qg]C['A' or 'B' don't help.]LB[ph:B][pg:A]
(;B[pg];W[qf]C['A' or 'B' are miai.]LB[pd:B][rh:A]
(;B[rh];W[pd];B[pe];W[qe];B[re];W[rf];B[pf];W[rc];B[rg];W[sd];B[sf];
W[ob];B[nb];W[pa])

(;B[pd];W[rh])
)

(;B[ph];W[rf]C['A' and 'B' are miai.]LB[pd:B][rh:A]
(;B[rh];W[pd];B[pe];W[qe];B[rc];W[pf];B[oe];W[rb];B[sb];W[qb];B[re];
W[qf];B[ob];W[se])

(;B[pd];W[rh])
)
)
)

(;AB[lc][qj]AW[jc]C['A', 'B' or 'C',]PL[2]LB[nc:C][rd:B][qc:A]
(;W[qc]C['A' or 'B'.]LB[rd:B][pc:A]
(;B[pc];W[rd]C['A' takes the corner, 'B' the outsisde.]LB[qe:B][rc:A]
(;B[rc];W[qe];B[qb];W[qh])

(;B[qe];W[qb];B[re];W[sc];B[se];W[ra];B[pb];W[sb])
)

(;B[rd];W[nc])
)

(;W[rd]C['A' takes the outside, 'B' the corner, 'C' the right side.]
LB[re:C][rc:B][qe:A]
(;B[qe];W[qc];B[pc];W[qb];B[re];W[sc];B[se];W[ra];B[pb];W[sb])

(;B[rc];W[qe];B[pd];W[qh])

(;B[re];W[qc];B[pd]C[White aims at A or B.]LB[nc:B][ob:A])
)

(;W[nc]C['A' or 'B'.]LB[md:B][nd:A]
(;B[nd];W[mc]C['A' lets connect, 'B' lets live.]LB[ld:B][md:A]
(;B[md];W[lb];B[ld];W[nb])

(;B[ld];W[lb];B[kb];W[ma];B[kc];W[qb];B[rb];W[pb];B[qc];W[ra];B[rc];
W[nb])
)

(;B[md];W[qc];B[pc];W[qb]
C['A' makes a wall to the top, 'B' to the right.]LB[rc:B][pb:A]
(;B[pb];W[rd];B[qe];W[re];B[qf];W[rf];B[qg])

(;B[rc];W[rb];B[rd];W[pb];B[oc];W[ob];B[nd];W[mb])
)
)
)

(;B[qj];AB[pp]
C['A' is the correct invasion, 'B' the reduction, 'C' is bad.
]
LB[qh:A][oj:B][qc:C]
(;W[qh]LB[oi:A][oh:B][pi:C]
C['A' and 'B' are ok, 'A' makes a wall to the left, 'B' strengthens the upper side.
'C' is good to enlargen a moyo on the lower side.
]
(;B[oi];W[og];B[pg];W[ph];B[oh];W[pf];B[ng];W[qg];B[nf])

(;B[oh];W[pi]
(;B[pk];W[oi];B[mh];W[nj];B[nl];W[lj])

(;B[nj];W[pj];B[qk])
)

(;B[pi];W[og])
)

(;W[oj];B[ph];W[oh];B[pg];W[qk];B[rk];W[rj];B[ri];W[pj];B[sj];W[qi];
B[rj];W[ql]PL[2];W[pc]C[Later, White can make ko here.
];B[oc];W[qc];
B[pd];W[rd];B[re];W[rb];B[sd];W[sc])

(;W[qc];B[pc];W[rd];B[rc];W[qe];B[qb]
C[White has now damaged the possibility to make a ko in the corner.
];
W[qh];B[oi];W[og];B[mh])
)

(;B[pj];PL[1]AB[pp];W[qh]PL[1]LB[qj:A][oh:B]
C['A' is correct, 'B' is not an attack.
]
(;B[qj];W[oh];B[pg]C[Makes White heavy.
];W[ph];B[ni];W[nh];B[mi];
W[mh];B[li];W[kg];B[mf];W[lh];B[ji])

(;B[oh]LB[rj:A][qj:B]C['A' is correct, 'B' is an overplay.
]
(;W[rj];B[qk];W[rk];B[qm];W[rl];B[rm];W[qf];B[jp])

(;W[qj];B[qk];W[pk]LB[oj:A][qi:B]
C['A' is best with the ladder, 'B' is not.
]
(;B[oj];W[ql];B[rk];W[rj];B[rl]LB[pl:A][qm:B]
C['A' doesn't try to kill, 'B' fails without the ladder.
]
(;W[pl];B[qm])

(;W[qm];B[pl];W[ok];B[pm];W[rm];B[nk])
)

(;B[qi];W[rj];B[oj];W[ql];B[ri];W[rk]PL[2];W[rh]C[Later.
];B[si];W[ph]
;B[pi];W[og])
)
)
)
)
)

(;B[nc]
C[
Oogeima Shimari
-------------------

Reductions after White tenuki 'A' or 'B'.
Invasions with an additional White stone on 'C' or 'D'.

Black continuations to forestall White attacks are usually 'E' or 'F'.
Black 'G' puts emphasis on the right side. Black 'H' makes White on D powerless.
Black 'I' is a special case, usually not recommended.
]
PL[1]LB[lc:D][qf:C][qj:B][dp:A][pd:E][od:F][oe:G][ne:H][qe:I]
(;W[dp];B[qj]
C['A' or 'B' reduce.
'C' is an invasion.
'D' is correct, if there is an additional Black stone on B.]
LB[rd:D][qf:C][ne:B][od:A]
(;W[od]C['A' is correct, 'B' helps White.]LB[nd:B][oc:A]
(;B[oc];W[pd]C['A' is joseki, 'B' helps White.]LB[qc:B][pc:A]
(;B[pc];W[qe];B[rd];W[of]C[Black can continue on A or B.]
LB[me:B][qf:A])

(;B[qc];W[qe]
C['A' is better than 'B' which loses a lot of territory.
'C' doesn't connect,
'D' doesn't prevent White from settling his group.]
LB[pe:D][qf:C][qg:B][re:A]
(;B[re];W[qf];B[rf];W[qh])

(;B[qg];W[pc];B[pb];W[qb];B[rb]C['A' or 'B'.]LB[og:B][nd:A]
(;W[nd];B[mc];W[md];B[re]C[Black cannot connect.];W[rd];B[rc];W[rf])

(;W[og])
)

(;B[qf];W[re])

(;B[pe];W[qf])
)
)

(;B[nd];W[oe])
)

(;W[ne]
C[The White move is recommended if there is an additional Black
stone on the triangled position.
'A' and 'E' are joseki.
'A' secures the right side.
'B' is too light.
'C' or 'G' leave the right side open.
'D' gives White the choice.
'E' defends the corner.
'F' gives White influence.]
LB[od:G][me:F][ld:E][nd:D][pd:C][pf:B][pe:A]TR[oj]
(;B[pe];W[pc]C['A' is correct, 'B' and 'C' are inferior.]
LB[oc:C][od:B][qc:A]
(;B[qc]C['A' settles immediately, 'B' is light.]LB[ld:B][mc:A]
(;W[mc];B[mb];W[nb]C['A' is joseki, 'B' loses territory.]
LB[lc:B][ob:A]
(;B[ob];W[nd]C['A' is correct, 'B' is gote and inferior..]
LB[na:B][oc:A]
(;B[oc];W[lb];B[na];W[ld])

(;B[na];W[oc];B[nb];W[lc];B[dd]
C[If Black never adds a stone, White can later force a ko.];W[pb];
B[od];W[qb];B[rb];W[ra];B[sb];W[lb];B[pd];W[pa];B[sa];W[la];B[qa])
)

(;B[lc]C['A' settles White, 'B' is inferior, gives a ladder.]
LB[md:B][oc:A]
(;W[oc];B[md];W[nd];B[mc];W[oe];B[pg];W[me])

(;W[md];B[ob];W[lb];B[na];W[kc])
)
)

(;W[ld])
)

(;B[od];W[qc]LB[ob:B][rd:A]
(;B[rd];W[ob];B[nb]
C['A' -> 10.000 year ko or hunt, 'B' -> ko, inferior.]LB[rc:B][oc:A]
(;W[oc]
C['A' encloses the corner, 'B' drives the White stones out to attack
them further.]
LB[rb:B][nd:A]
(;B[nd];W[rc];B[rb];W[sb];B[qb];W[ra];B[qa])

(;B[rb];W[nd];B[lc];W[pd]C['A' is correct, 'B' is a mistake.]
LB[oe:B][pf:A]
(;B[pf];W[oe])

(;B[oe];W[rc];B[sc];W[qe]C['A' or 'B' don't help.]LB[qf:B][re:A]
(;B[re];W[qf];B[pg];W[rf];B[sb];W[sd];B[se];W[sf];B[sd];W[qb])

(;B[qf];W[re];B[se];W[sd];B[rd];W[rf])
)
)
)

(;W[rc]C['A' -> ko, 'B' -> White lives.]LB[oa:B][oc:A]
(;B[oc]C['A' -> ko, 'B' or 'C' -> White dies.]LB[pa:C][pb:B][oa:A]
(;W[oa];B[rb];W[sb];B[qb];W[ra];B[qa];W[pb];B[sa])

(;W[pb];B[oa];W[pd];B[qe];W[oe];B[ld])

(;W[pa];B[sc];W[sb];B[ra]C['A' or 'B' don't live.]LB[qa:B][qb:A]
(;W[qb];B[na])

(;W[qa];B[na];W[rb];B[pb];W[pd];B[qe];W[oe];B[lc])
)
)

(;B[oa];W[pa];B[na];W[oc]
C[The move secures the triangled stone and life, the cut at B is
a threat for later.
'A' or 'B' don't kill..]
LB[nd:B][qa:A]TR[ob]
(;B[qa];W[ra];B[pb];W[qb];B[pa];W[sb];B[nd])

(;B[nd];W[ra])
)
)
)

(;B[ob]C[White continuations on A or B.]LB[mb:B][qf:A])
)

(;B[oc];W[qc]
C[White can keep the aji of this move in reserve.
'A' or 'B' -> ko, 'C' -> White connects outside.]
LB[rc:C][rd:B][pd:A]
(;B[pd];W[rd];B[re];W[rb];B[sd];W[sc])

(;B[rd];W[rc];B[pd];W[ob];B[nb];W[oa];B[rb];W[sb];B[qb];W[ra];B[qa];
W[pb];B[sa])

(;B[rc]
C['A' is correct, 'B' lives, but gives Black huge influence and
hurts White 6.]
LB[ne:6][pd:B][rd:A]
(;W[rd]
C['A', aiming to hunt Whitem is correct.
'B' gives White life which is inferior..]
LB[pd:B][re:A]
(;B[re];W[pd];B[sd];W[od];B[ld];W[qf];B[qe]
(;W[ng];B[qg])

(;W[of];B[qg])
)

(;B[pd];W[rb];B[re];W[sc])
)

(;W[pd]C['A' takes influence, 'B' aims to hunt White.]LB[qe:B][od:A]
(;B[od]C['A' is correct, 'B' is wrong.]LB[qe:B][rd:A]
(;W[rd];B[qe];W[rb];B[qb];W[pb];B[ob];W[qa];B[re];W[sc];B[oe])

(;W[qe];B[rd])
)

(;B[qe];W[od];B[ld];W[rb];B[rd])
)
)
)
)

(;B[pf];W[pc];B[qc];W[mc];B[mb];W[nb];B[ob];W[oc]
C['A' or 'B' don't help.]LB[nd:B][na:A]
(;B[na];W[nd];B[nb];W[lc]C[White threatens a ko on A.]LB[pb:A])

(;B[nd];W[pe];B[qe];W[md])
)

(;B[pd]C['A' is correct, 'B' is what Black wants.]LB[mc:B][pf:A]
(;W[pf])

(;W[mc];B[mb];W[nb];B[nd])
)

(;B[nd]C['A' is correct, 'B' takes all pressure from Black.]
LB[me:B][oe:A]
(;W[oe]C['A' is necessary, tenuki 'B' loses the corner,]LB[pp:B][pd:A]
(;B[pd]C['A' or 'B'.]LB[qf:B][le:A]
(;W[le])

(;W[qf])
)

(;B[pp];W[qc];B[pd];W[pc];B[oc];W[rd];B[re];W[rc];B[qf];W[ob];B[nb];
W[pb])
)

(;W[me];B[oe];W[of];B[pe])
)

(;B[ld]
C['A' tries to take the upper side. 'B' makes light shape to the
center, if there is an additional Black stone on the triangled
position, keeping A in reserve.]
LB[pe:B][oc:A]TR[oj]
(;W[oc]C['A' is correct, 'B' is inferior.]LB[ob:B][od:A]
(;B[od];W[nd]C['A' is correct, 'B' gives Black much territory.]
LB[oe:B][pc:A]
(;B[pc];W[mc];B[ob];W[nb];B[oc];W[md];B[le])

(;B[oe];W[mc];B[nb]C['A' takes the outisde, 'B' the corner.]
LB[pc:B][lc:A]
(;W[lc];B[ob];W[kd];B[nf];W[le])

(;W[pc];B[mb];W[qc];B[qe];W[rb];B[rd];W[qa])
)
)

(;B[ob];W[pc])
)

(;AB[oj];W[pe];B[pd];W[oh];B[qh];W[mh];B[pp]
C[Continuation for White follows.];W[mc];B[md];W[oc];B[od];W[nd];B[nb]
;W[mb];B[ob];W[kc])
)

(;B[me]C['A' goes outside, 'B' slides into the corner.]LB[nd:B][mf:A]
(;W[mf];B[md]C['A' is usual, 'B' emphasizes the center.]LB[lf:B][nf:A]
(;W[nf]C['A' is correct, any other move like 'B' is a mistake.]
LB[id:B][od:A]
(;B[od];W[kf])

(;B[id];W[oc];B[od];W[nd]C['A' or 'B' don't help.]LB[mc:B][pc:A]
(;B[pc];W[mc];B[ob];W[nb];B[oc]
C['A' sacrifices for a strong wall.
'B' initiates a ladder.]
LB[ld:B][le:A]
(;W[le];B[ld];W[kd];B[lc];W[kc];B[lb];W[kf])

(;W[ld];B[le];W[ke];B[lf];W[lg])
)

(;B[mc];W[pd];B[oe];W[pe];B[of];W[og];B[pf];W[qf];B[pg];W[ph];B[qg];
W[rg];B[qh];W[qi];B[rh];W[ri])
)
)

(;W[lf])
)

(;W[nd];B[md];W[oc])
)

(;B[od];W[pf])
)

(;W[qf];B[qh]
C['A' to live on the side and center, 'B' takes the ciorner.]
LB[qc:B][od:A]
(;W[od];B[oc];W[rd]
C['A' is correct, 'B' only makes White more solid.
If the triangled stone is mor far away, 'B' is correct and 'A' wrong.
]
LB[rc:B][qc:A]TR[qj]
(;B[qc];W[of]C[White continuations on A and B.]LB[pd:B][qe:A])

(;B[rc];W[pd]LB[qc:A][pc:B]C['A' is correct, 'B' is bad.
]
(;B[qc];W[pc];B[pb];W[qb]C['A' is correct, 'B' is a mistake.]
LB[ob:B][rb:A]
(;B[rb];W[of])

(;B[ob];W[qe]
C['A' is correct, 'B' is a mistake weakening the triangled stones.]
LB[re:B][rb:A]TR[qj][qh]
(;B[rb];W[of])

(;B[re];W[rb];B[sd];W[sb];B[sc];W[rf];B[qa];W[sf];B[ra];W[of])
)
)

(;B[pc];W[qe];B[qc];W[of])
)

(;AE[qj]AB[qk]LB[rc:A][qc:B]C['A' is correct, 'B' wrong.
]
(;B[rc];W[pd]LB[qc:A][pc:B]C['A' is correct, 'B' is bad.
]
(;B[qc]LB[pc:A][of:B]C['A' is correct, 'B' is too early.
]
(;W[pc];B[pb];W[qb]LB[rb:A][ob:B]
C['A' is correct, 'B' is not recommended.
]
(;B[rb];W[of]LB[qe:A][ob:B]
C[End of joseki. 
Black has no strong attack, because 'A' and 'B' are miai.
]
(;B[qe];W[ob];B[qa];W[md])

(;B[ob];W[qe])
)

(;B[ob];W[qe]LB[rb:A][re:B]C['A' is ok, 'B' is questionable.
]
(;B[rb];W[of]C[Now White has more stability than necessary.
])

(;B[re];W[rb];B[sd];W[sb];B[sc];W[rf];B[qa];W[of]PL[2];W[sg]
LB[se:A][rj:B]
C[Later, White can use this aji and play ko for the corner on A or undermine Black's right group on B.
])
)
)

(;W[of];B[qe]LB[pc:A][pf:B][pe:C]
C['A' is correct, 'B' and 'C' are mistakes.
]
(;W[pc];B[pb];W[qb]LB[rb:A][ob:B]
C[Asking move. Will Black play 'A' or 'B'?
]
(;B[rb];W[ob];B[qa];W[md]LB[nd:A][pf:B][nb:C]
C['A' is possible and leads to middle game fighting. 'B' is not recommended. 'C' allows White tenuki.
]
(;B[nd];W[ne];B[mc];W[lc];B[ld];W[me]LB[kc:A][nb:B]
C['A' is correct, 'B' unnecessarily gives White a ladder.
]
(;B[kc];W[lb];B[nb];W[jc])

(;B[nb];W[kd])
)

(;B[pf];W[nb];B[mc];W[lc];B[mb];W[lb];B[oa];W[nd];B[na];W[ke])

(;B[nb];W[qm]
C[White can play elsewhere, e.g. attack the two Black stones on the right side.
]
;B[nd];W[mf]C[White doesn't need to care to safe all stones.
])
)

(;B[ob];W[qg];B[ph];W[re];B[rb];W[rh];B[ri];W[rg];B[qn];W[og])
)

(;W[pf];B[oh])

(;W[pe];B[rf];W[qg];B[rg];W[ph];B[qi])
)
)

(;B[pc];W[qe];B[qc];W[of])
)

(;B[qc];W[of]C[White has good shape.
];B[qe]
C[Black has no good attack. The continuation is given only as proof.
]
;W[qg]LB[ph:A][re:B]C['A' and 'B' are miai for White to make sabaki.
]
(;B[ph];W[re])

(;B[re];W[ph])
)
)
)

(;W[qc]
C[These variations are covered in the branching without the triangled
stones.
]
TR[dp][qj][qh])
)

(;AB[ne];W[rd]
C['A' and 'C' defend territory driving White out.
'B' encloses a White ko in the corner.
'D' is not recommended giving White good shape.]
LB[rc:D][re:C][qe:B][qc:A]
(;B[qc];W[qh]C['A' is correct, 'B' gives White good shape.]
LB[pi:B][qf:A]
(;B[qf];W[oh])

(;B[pi];W[qe])
)

(;B[qe]C['A' makes the corner ko, 'B' gives Black a huge influence.]
LB[re:B][qc:A]
(;W[qc];B[re];W[pb]
C['A' closes White in, 'B' is inferior and drives White out.]
LB[rc:B][ob:A]
(;B[ob];W[rb];B[sd];W[sc])

(;B[rc];W[nb])
)

(;W[re]
C['A' attacks White in sente, 'B' encloses the corner in gote and
overconcentration.]
LB[rf:B][rc:A]
(;B[rc];W[qh];B[oj];W[qf]
C['A' makes overwhelming thickness, 'B' drives White out to attack
the group through the center.]
LB[rg:B][pf:A]
(;B[pf];W[qg];B[sd];W[rf];B[oh];W[rj]
(;B[rk];W[ri];B[qk];W[sg])

(;B[ri];W[qi];B[rk];W[pj];B[qk];W[rh];B[sj];W[oi];B[ni];W[pi];B[ok];
W[og];B[pg];W[ph];B[nh];W[pe];B[of];W[qc];B[pd];W[rb])
)

(;B[rg];W[rf];B[rh];W[ri];B[qi];W[qg];B[rj];W[ng])
)

(;B[rf];W[qc];B[pc];W[qb];B[se];W[sc];B[sf];W[ra];B[pb];W[sb];B[qf])
)
)

(;B[re];W[qe];B[rc];W[pd];B[qc];W[rf];B[sd];W[pi];B[pj];W[oi];B[qf];
W[qg];B[pf];W[rh])

(;B[rc];W[qe];B[pd];W[qh])
)
)

(;W[qj]PL[2];B[qg];W[pf];B[qf]
C['A' or 'B' are ok, in both cases White needs the ladder.]
LB[oc:B][pc:A]
(;W[pc]
C['A' or 'B' are ok.
If Black has the ladder, the punishment is possible after 'B'.
'C' -> White can live in the corner.
]
PL[1]LB[pd:B][qc:A][od:C]
(;B[qc];W[pd];B[ne];W[nf];B[me]C[Later, Black can connect on A.]PL[2]
LB[pb:A];B[pb];W[ob];B[oc])

(;B[pd];W[oc]
C['A' if White has the ladder and Black wants the corner.
'B' punishes with a Black ladder or makes a wall to the left without.
]
LB[nd:B][od:A]
(;B[od];W[nb];B[mb];W[mc];B[nd];W[lb];B[ob];W[ma];B[pb])

(;B[nd];W[od];B[oe];W[nb];B[mb];W[ob]LB[ne:A][qc:B]
C['A' is usual, 'B' kills with the ladder.
]
(;B[ne];W[rc])

(;B[qc];W[qb];B[rb];W[mc];B[lb];W[ne];B[md];W[nf];B[of];W[lc];B[kc];
W[ld];B[me];W[kd];B[jc];W[mf])
)
)

(;B[od];W[rd];B[re];W[pd];B[pe];W[qc];B[qe];W[nb];B[mb];W[ob];B[mc];
W[rc])
)

(;W[oc]
C['A' gives perfect influence.
'B' doesn't, but Black gets only a ko.
The punishment, if Black has the ladder, is after 'A'.]
LB[pc:B][od:A]
(;B[od];W[pc];B[nd];W[pd];B[pe];W[qc];B[rd];W[oe];B[qe];W[nb];B[mb];
W[ob]
C['A' if White has the ladder.
'B' punishes if Black has the ladder.]
LB[rc:B][lc:A]
(;B[lc];W[rc])

(;B[rc];W[mc];B[lb];W[ne];B[md];W[lc];B[kc];W[ld];B[me])
)

(;B[pc];W[od];B[ob];W[nb];B[mb];W[nd];B[mc];W[pb];B[na];W[qc];B[pd];
W[rd];B[re];W[rb];B[pa];W[qa];B[qb]
C[Black can try to swallow the White center stones for the ko.])
)
)

(;AW[qf];W[qc]
C['A' -> White lives, Black builds a wall.
'B' -> White connects, but does not yet live.
'C' is not recommended.
'D' pushes White to the top side and risks an almighty ko.
'E' is inferior.
]
LB[pc:B][pd:A][rd:C][rc:D][qe:E]
(;B[pd]LB[pc:A][rd:B]C['A' is usual, 'B' is possible.
]
(;W[pc];B[oc];W[rd];B[re];W[rc];B[qe];W[pf];B[oe];W[pb])

(;W[rd];B[re];W[rc];B[qe];W[ob];B[nb];W[oc];B[od]PL[1]LB[pc:A][oa:B]
C[White lives on 'A', or Black kills on 'B'.
]
(;W[pc];B[me])

(;B[oa];W[pb];B[sd])
)
)

(;B[pc]
C['A' is correct -> White will connect,
'B' is disadvantageous -> White is separated small in the corner.
'C' is a mistake -> White dies.
'D' is a mistake.
]
LB[rd:D][qb:C][pd:B][rc:A]
(;W[rc]
C['A' is correct, 'B' is lame, but better if White has the ladder.
]
LB[pd:B][rd:A]
(;B[rd]
C['A' is correct, White connects.
'B' is wrong, White lives small.
]
LB[pb:B][pd:A]
(;W[pd]
C['A' is correct, White lives or goes outside.
'B' -> Ko.
'C' is ok.
'D' is a mistakes.
]
LB[pb:D][rb:C][od:B][pe:A]
(;B[pe];W[od]LB[oc:A][qe:B]C['A' is correct, 'B' wrong.
]
(;B[oc]LB[qe:A][pb:B]
C['A' White lives in the corner, 'B' White sacrifices the corner for outside strength.
]
(;W[qe]LB[oe:A][ne:B]C['A' with the ladder, 'B' without.
]
(;B[oe]
C['A' White connects.
If Black made the mistake of allowing this variation without
having the ladder, White punishes on 'B'.]
LB[nd:B][sd:A]
(;W[sd];B[re];W[rf];B[nd];W[pd])

(;W[nd];B[md];W[ne];B[nf];W[me];B[le])
)

(;B[ne];W[oe];B[of];W[pf];B[nd];W[pe];B[pg])
)

(;W[pb];B[ob];W[oe];B[rf];W[of]LB[qg:A][re:B]
C['A' or, with an additional stone 'B'.
]
(;B[qg];W[re];B[qe];W[pf];B[se];W[qa];B[rb];W[sb];B[ra];W[ld])

(;AB[qh];B[re];W[qa];B[rb];W[sb];B[ra];W[ld])
)
)

(;B[qe];W[oc])
)

(;B[od]C['A' -> ko, 'B' -> White lives. White usually prefers the ko.]
LB[pb:B][pe:A]
(;W[pe];B[rb]C['A' or 'B' -> Ko.]LB[qb:B][pb:A]
(;W[pb];B[ob];W[qb];B[sc];W[re];B[pa])

(;W[qb]C['A' -> Ko, 'B' is a mistake -> White captures.]LB[pb:B][sc:A]
(;B[sc];W[pb];B[ob];W[re];B[pa];W[oc])

(;B[pb];W[sb];B[ra];W[qa];B[sd];W[re];B[pa];W[sa];B[rb];W[qe])
)
)

(;W[pb]
C['A' -> White lives. 'B' ko,
In all variations of this invasion, Black must not choose the
ko if he doesn't win it, because if he loses it, he loses the
two triangled stones. If Black instead of playing ko lets White
live in the corner, he keeps these two stones and can destroy
the right side with them. Because of this and because Black must
find the first ko threat, playing the ko is usually not attractive
for Black.]
LB[ob:B][pe:A]TR[rd][qd]
(;B[pe];W[rb];B[qa];W[ra];B[sc];W[sb];B[ob];W[pa];B[oa];W[qb])

(;B[ob];W[pe];B[rb];W[qb];B[sc];W[re];B[pa];W[oc])
)
)

(;B[rb]
C['A' is correct.
'B' takes a small corner in gote and gives Black a huge wall.
'C' -> White dies.
]
LB[oc:A][pb:B][qb:C]
(;W[oc];B[pb];W[od];B[ob];W[re];B[qb];W[qe];B[sc];W[of])

(;W[pb];B[oc];W[qb]C['A' keeps White divided, 'B' is wrong.]
LB[ra:B][pe:A]
(;B[pe];W[ra])

(;B[ra];W[qe];B[sc];W[re];B[sd];W[sb];B[sa];W[se])
)

(;W[qb];B[pb];W[sb];B[ra];W[qa];B[pe];W[sd];B[re];W[od];B[rf])
)

(;B[pb];W[qe];B[od];W[pe];B[rb];W[re];B[qb];W[sd])
)

(;W[pb]
C['A' -> White lives small in gote, Black has a perfect wall.
'B' -> White lives, Black has a cut.
'C' -> Ko,
'D' -> White lives with even more points.
]
LB[pd:A][oc:B][ob:C][qb:D]
(;B[pd]LB[rb:A][ob:B]C['A' lives, 'B' runs.
]
(;W[rb];B[ob];W[qa])

(;W[ob];B[rb];W[qb];B[sc];W[nb];B[mc])
)

(;B[oc]C['A' White lives.
'B' White dies.]LB[qa:B][rb:A]
(;W[rb]LB[pd:A]C[Later, White may use the aji of the cut on A.
];B[qa]
C[Proof of life.
];W[ra];B[sc];W[sb];B[pa];W[ob])

(;W[qa];B[oa];W[sb];B[ra];W[rb];B[ob])
)

(;B[ob];W[pd]
C['A' is correct and ko, 'B' is wrong and gives the corner to White
without fighting.]
LB[oc:B][od:A]
(;B[od];W[pe];B[rb];W[qb];B[sc];W[re];B[pa];W[oc])

(;B[oc];W[qe])
)

(;B[qb];W[oc];B[pd];W[ob];B[od];W[nb];B[mc];W[rb])
)
)

(;B[pd];W[rd])
)

(;W[pd]
C['A' White lives small in the corner, Black builds a big wall, good for Black
'B' similar to 'A'
'C' Black wall, White lives small in the corner, good for Black
'D' White lives, Black is overconcentrated, good for White
'E' nonsense
]
LB[rd:A][rc:B][qb:C][od:D][pb:E]
(;B[rd]C['A' White lives in the corner. 'B' White fails severely.]
LB[oc:B][pb:A]
(;W[pb];B[oc];W[rc];B[pe];W[rb]C[Good for Black.];B[qa];W[ra];B[sc];
W[sb];B[ob];W[pa])

(;W[oc];B[pb];W[ob];B[od];W[pe];B[nb];W[qb];B[oa];W[rc];B[sb]
C[Three eggs tesuji.];W[sc];B[sd];W[re];B[qa])
)

(;B[rc];W[qb]
C['A' White lives small. good for Black
'B' connects better than necessary.
'C' White wall outside.
'D' is nonsense.
]
LB[rd:D][rb:C][pb:B][od:A]
(;B[od]C['A' White lives small
'B' White dies
]LB[rd:A][pe:B]
(;W[rd];B[pe];W[rb];B[re];W[sc];B[qe])

(;W[pe];B[re];W[pb];B[oc];W[rb];B[rf];W[qg];B[sb])
)

(;B[pb];W[rd];B[qe];W[re];B[pe];W[pf];B[oe];W[rb])

(;B[rb]C['A' is correct, 'B' is a mistake.]LB[pb:B][rd:A]
(;W[rd];B[qe];W[pe];B[re];W[rf];B[sd];W[oc];B[pb];W[ob];B[qa];W[nd])

(;W[pb];B[oc];W[rd];B[qe];W[re];B[pe];W[pf];B[oe]
C['A' or 'B' don't help.]LB[sc:B][sb:A]
(;W[sb];B[ra];W[sc];B[ob])

(;W[sc];B[ra];W[sb];B[ob])
)
)

(;B[rd];W[oc];B[pb];W[ob];B[pe];W[od]C[disaster for Black])
)

(;B[qb];W[rc]C['A' White lives
'B' ko]LB[od:B][rd:A]
(;B[rd];W[pb];B[oc];W[rb];B[pe]
C['A' is necessary
tenuki 'B' -> White dies]LB[dp:B][qa:A]
(;W[qa])

(;W[dp];B[qa];W[ra];B[sc])
)

(;B[od]C['A' ko for the corner
'B' White connects few stones in sente]
LB[rd:B][pe:A]
(;W[pe];B[rd];W[pb];B[ob];W[oc])

(;W[rd];B[pe])
)
)

(;B[od]
C['A' is correct, Black gets overconcentrated.
'B' is bad, White loses the corner.
]
LB[rd:A][pe:B]
(;W[rd];B[pe];W[rb];B[qb];W[rc])

(;W[pe];B[rc];W[qb];B[re];W[pb];B[oc];W[rb];B[rf];W[qg];B[sb])
)

(;B[pb];W[rd];B[qe];W[pe];B[re];W[rf])
)

(;W[qb];B[rd]C['A' or 'B' don't help.]LB[pb:B][pd:A]
(;W[pd];B[pb];W[qe];B[od];W[pe];B[rb];W[re];B[rc])

(;W[pb]
C['A' is correct, 'B' is wrong without the ladder and unnecessary
with it.]
LB[ob:B][oc:A]
(;B[oc];W[rc];B[ra];W[ob];B[nb];W[qa];B[oa])

(;B[ob];W[pd];B[oc];W[qe];B[rc];W[rb];B[sb];W[re];B[pe];W[od];B[oe];
W[nd];B[md])
)
)

(;W[rd];B[rc];W[qb]
C['A' is correct, 'B' is possible with an additional Black stone
on or near the triangled point.]
LB[re:B][rb:A]TR[pj]
(;B[rb];W[pd];B[qe];W[re];B[pe];W[pf];B[od])

(;AB[pj];B[re];W[pd];B[qe];W[oc];B[od];W[pb];B[oe]
C['A' is correct, 'B' is a mistake.]LB[pf:B][nb:A]
(;W[nb];B[pf])

(;W[pf];B[pe];W[ph];B[ob];W[pc];B[nb];W[rb];B[sd])
)
)
)

(;B[rd];W[oc]LB[od:A][pd:B]
C['A' or 'B' don't give Black a strong position.
]
(;B[od];W[pd];B[pe];W[pc];B[qe];W[nd];B[oe];W[mc];B[nb];W[mb])

(;B[pd];W[od];B[pc];W[pb];B[qb];W[nb])
)

(;B[rc]LB[pd:A][pc:B]
C['A' is correct, 'B' is giving Black too much outside strength.
]
(;W[pd];B[pc];W[qb];B[rd];W[oc];B[od];W[pb];B[pe]LB[pc:A][qe:B]
C[Black lives on 'A', or starts an almighty ko on 'B' if he has more decisive ko-threats.
]
(;W[pc];B[qe];W[nd];B[oe];W[mc])

(;W[qe];B[pc])
)

(;W[pc];B[pd];W[rb];B[rd];W[oc];B[od];W[nb];B[mb];W[na];B[mc]PL[1]
LB[sb:A][ra:B]
C[White lives on 'A', or Black starts a ko for life on 'B'.
]
(;W[sb])

(;B[ra];W[sb];B[pa];W[pb];B[ma];W[ob];B[qb])
)
)

(;B[qe];W[pc];B[od];W[rb];B[rd];W[qa]LB[pf:A][pd:B]
C[White lives easily.
Later, White has the aji of A and of B.
])
)

(;AW[lc];W[pc]
C[This invasion is possible only with the triangled helping stone.
'A' or 'B'.]
LB[pd:B][qc:A]TR[lc]
(;B[qc];W[oc]LB[oe:A][nd:B]C['A' is correct, 'B' is questionable.
]
(;B[oe];W[nd])

(;B[nd];W[nb];B[mb];W[pe];B[pd];W[od];B[oe];W[ne];B[of];W[md];B[mc];
W[lb])
)

(;B[pd];W[oc];B[od];W[nb];B[nd];W[ob])
)

(;B[pd])

(;B[od])

(;B[oe])

(;B[ne])

(;B[qe])
)

(;B[nd]
C[
Nikken-Tobi Shimari
----------------------

'A' or 'B' are ok.
]
LB[qc:B][oc:A]
(;W[oc]C['A' or 'B' are ok.]LB[od:B][nc:A]
(;B[nc];W[qc]C['A' or 'B' are ok.]LB[pd:B][rc:A]
(;B[rc];W[pd])

(;B[pd];W[pc];B[rc];W[rb];B[rd];W[sb])
)

(;B[od];W[qc]C['A' is more powerful than 'B'.]LB[pc:B][rc:A]
(;B[rc]C['A' is ok, 'B' is questionable.]LB[rd:B][pd:A]
(;W[pd];B[pe];W[pc];B[rd];W[mb])

(;W[rd];B[pc];W[qb];B[rb])
)

(;B[pc];W[pb];B[pd];W[rb])
)
)

(;W[qc];B[pc];W[rd];B[qe]C[White lives with 'A' or 'B'.]LB[qb:B][re:A]
(;W[re];B[rf];W[qb];B[se];W[sc];B[sf];W[ra];B[pb];W[sb])

(;W[qb];B[re];W[sc];B[se];W[ra];B[pb];W[sb])
)
)
)

(;W[qj]
C[White 2 shows a special strategy.
'A' Black has a shimari.
'B' Black played the Mini-Chinese Fuseki.]
LB[ql:B][oc:A]
(;B[oc];W[mc];B[qh];W[qf];B[pg];W[pe];B[nd];W[pd];B[pc];W[of];B[md])

(;AB[kc];B[qm];W[qg]C['A' or 'B'.]LB[pi:B][pf:A]
(;B[pf]C['A' is correct, 'B' is a mistake.]LB[pg:B][re:A]
(;W[re]
C['A' is for influence, 'B' is for territory, 'C' is slightly disadvantageous.]
LB[qe:C][rf:B][pg:A]
(;B[pg];W[qe];B[pe];W[qh];B[pd])

(;B[rf];W[qf];B[qe];W[rg];B[rd];W[sf];B[md];W[ne])

(;B[qe];W[rd];B[rc];W[qf];B[pc];W[qb];B[qc];W[oh]
C[White 12 still has some aji.]LB[qb:12])
)

(;W[pg];B[of])
)

(;B[pi]C['A' is correct.
'B' and 'C' are disadvantageous.]
LB[qc:C][pj:B][qi:A]
(;W[qi]C['A' or 'B'.]LB[pg:B][pf:A]
(;B[pf]C['A' is correct, 'B' is disadvantageous, 'C' is a mistake.]
LB[pg:C][re:B][ph:A]
(;W[ph]C['A' is for influence, 'B' for territory.]LB[qf:B][oh:A]
(;B[oh];W[oi];B[ni]C['A' is correct, 'B' is a mistake.]LB[og:B][pj:A]
(;W[pj];B[og])

(;W[og];B[oj];W[nh]C['A' is correct, 'B' is possible, 'C' a mistake.]
LB[oi:C][ng:B][mh:A]
(;B[mh];W[oi];B[as]
C[In the Mini-Chinese Fuseki, Black has exactly one ko-threat.];W[bs];
B[oh];W[pg];B[ng];W[of];B[od])

(;B[ng];W[oi];B[as];W[bs];B[oh];W[mh];B[oi];W[pg];B[of];W[nf];B[mg];
W[qf];B[od];W[lh];B[mf]
C[Making two ponnuki in the center will be a better preparation
for fighting later in the game than making the plump bowl shape
just for cutting and taking about five to ten points more territory
on top.])

(;B[oi];W[pg];B[ng];W[of];B[mh];W[od])
)
)

(;B[qf];W[nh];B[le])
)

(;W[re];B[pg];W[qe];B[pe];W[qh];B[pd])

(;W[pg];B[of];W[og];B[nf];W[ng];B[mf])
)

(;B[pg]C['A' is correct, 'B', 'C', 'D' and 'E' are disadvantageous.]
LB[ld:E][qc:D][pf:C][qe:B][qf:A]
(;W[qf];B[pf]C['A' is correct, 'B' is disadvantageous.]LB[pe:B][qe:A]
(;W[qe];B[pe];W[pd];B[qc];W[pc];B[pb];W[ob];B[qb]C['A' or 'B'.]
LB[nd:B][ld:A]
(;W[ld];B[nd];W[lc];B[kd];W[le];B[oc];W[ke];B[id];W[je];B[hd])

(;W[nd];B[qh];W[rh];B[ph];W[pj];B[ld];W[me];B[oj];W[ok];B[ni])
)

(;W[pe];B[qe];W[pd];B[pc];W[oc];B[qc];W[nd];B[qh];W[rh];B[ph];W[re];
B[oe];W[od];B[ob];W[nb];B[pb];W[pj];B[me])
)

(;W[qe];B[pe];W[pf];B[of];W[qf];B[pd];W[ph];B[og];W[oh];B[nh])

(;W[pf];B[qf];W[qh];B[rf];W[of];B[og];W[nf];B[oi])

(;W[qc];B[qf];W[ph];B[oh];W[qh];B[pf]C['A' or 'B'.]LB[pd:B][pc:A]
(;W[pc];B[nc])

(;W[pd];B[pc]C['A' is less unfavrable than 'B'.]LB[oc:B][rd:A]
(;W[rd];B[qe];W[pb];B[oc];W[ob];B[rc];W[qb];B[nc];W[rb])

(;W[oc];B[pb];W[qe];B[rd];W[re];B[rf])
)
)

(;W[ld];B[qf];W[qh];B[kd];W[pf];B[rf];W[of];B[og];W[ng];B[oi]
C['A' and 'B' are miai.]LB[pk:B][nf:A]
(;W[nf];B[pk])

(;W[pk];B[nf])
)
)
)

(;W[pj]C['A', 'B' or 'C' give Black a superior position..]
LB[qi:C][ni:B][pf:A]
(;B[pf]
C[Both 'A' or 'B' don't disable a position which is favorable for
Black.]
LB[re:B][pg:A]
(;W[pg];B[og];W[oh]C['A' is recommended, 'B' is possible.]
LB[ng:B][oi:A]
(;B[oi]
C['A' brings a fight that is good for Black, 'B' gives Black overwhelming
thickness.]
LB[of:B][nh:A]
(;W[nh];B[ph];W[of];B[ng];W[rh];B[qf];W[rf];B[oe];W[mh];B[oj])

(;W[of];B[ng];W[pe];B[qf];W[qe];B[rf];W[re];B[rg];W[nf];B[ph];W[mg];
B[nh];W[oc];B[nd];W[nc];B[mf];W[me];B[lf];W[md];B[le];W[ld];B[kd];
W[lb];B[jf])
)

(;B[ng];W[qf];B[pe];W[oi]PL[2];W[qc]C[Later, White can use this aji.];
B[pc];W[rc]C['A' loses less than 'B'.]LB[rd:B][pb:A]
(;B[pb];W[rd];B[qe];W[re])

(;B[rd];W[pb];B[oc];W[rb];B[qa]C[Black can't kill.];W[ra])
)
)

(;W[re];B[pg];W[qe];B[pe];W[qh];B[pd]
C['A' is necessary, tenuki 'B' is a mistake.]LB[dp:B][ph:A]
(;W[ph];B[oh];W[oi];B[ni];W[oj];B[nh])

(;W[dp];B[qf];W[rf];B[qi];W[ri];B[rj];W[rh];B[rk];W[ph];B[oi];W[oh];
B[oj])
)
)

(;B[ni];W[oj];B[pf];W[re];B[rd];W[qe];B[pd];W[oi]PL[2];W[pe]C[Later.];
B[od])

(;B[qi];W[oi];B[rj];W[oh]C['A' is correct, 'B' is disadvantageous.]
LB[rh:B][oj:A]
(;B[oj];W[qe]C['A' is correct, 'B' is a mistake.]LB[pe:B][nj:A]
(;B[nj];W[pd];B[qc];W[pc];B[re];W[rf];B[pe];W[qf];B[pb];W[ob];B[qb];
W[nd];B[id])

(;B[pe];W[rk];B[rh];W[sj];B[ri];W[qk];B[rg];W[rf];B[pf];W[qf];B[pg];
W[ph];B[qh];W[rd];B[sf];W[re];B[qc];W[si])
)

(;B[rh];W[od];B[oj];W[nj];B[ok];W[nk];B[ol];W[qc])
)
)

(;W[qc]C['A' is correct, 'B' is also possible.]LB[pd:B][pc:A]
(;B[pc];W[pd];B[qe];W[oc];B[pb];W[rc];B[ob];W[pe];B[pf]
C['A' gives Black more territory, 'B' superior influence.]
LB[nd:B][nc:A]
(;W[nc];B[qf];W[nb];B[ne];W[od];B[qi])

(;W[nd];B[qf];W[nb];B[mc];W[nc];B[mb];W[qb];B[me];W[ne];B[nf];W[pa];
B[oe];W[od];B[of];W[pj];B[md];W[oa];B[nj])
)

(;B[pd];W[pc]C['A' is correct, 'B' is a mistake.]LB[oc:B][od:A]
(;B[od];W[qi];B[oc];W[ph];B[re])

(;B[oc];W[ob];B[nb];W[od];B[nc];W[pe];B[qe];W[pf];B[rc];W[rb];B[rd];
W[qf];B[sb];W[qb];B[nd];W[oe];B[pa];W[se];B[rf];W[rg];B[pb];W[re];
B[ra];W[pj])
)
)
)
)
)

(;W[pg]AB[dd][kc]
C[White 2 represents a special strategy when Black has a Chinese-style
fuseki at top.

Black continues with 'a', 'b', 'c' or 'd'.]
LB[pi:d][pf:c][pj:b][od:a]
(;B[od];W[pj])

(;B[pj]
C['A', 'B' or 'C'. If the triangled Black stone is high, also 'D'
is possible.]
LB[pd:D][oe:C][oi:B][od:A]TR[kc]
(;W[od];B[oe];W[ne];B[pe];W[nf];B[nd];W[md];B[nc];W[mc];B[ob];W[nb];
B[oc];W[lf])

(;W[oi]C['A' or 'B' are both good.]LB[oj:B][od:A]
(;B[od];W[oj])

(;B[oj];W[od];B[oe];W[pe];B[pd];W[oc]
C['A' is correct, 'B' and 'C' are disadvantageous.]
LB[ne:C][pf:B][of:A]
(;B[of];W[qe];B[pb];W[pc];B[qc];W[ob];B[pf];W[qf];B[qg];W[rd];B[rc];
W[re];B[og];W[rb];B[nd])

(;B[pf];W[of];B[qe];W[ne])

(;B[ne];W[qe];B[re];W[rf];B[rd];W[pi];B[pc];W[qj];B[qk];W[rk])
)
)

(;W[oe];B[oc]C['A' or 'B'.]LB[pm:B][qm:A]
(;W[qm];B[ni];W[mf];B[ng];W[md];B[re];W[ke];B[mc];W[ld];B[lc];W[pd];
B[pc];W[lh];B[lj])

(;W[pm];B[mj];W[mh];B[pl];W[ql];B[ol];W[qk];B[qj])
)

(;AB[kd]AE[kc];W[pd]C['A' or 'B' are both possible.]LB[pc:B][pe:A]
(;B[pe];W[qc];B[qe];W[pc];B[ne];W[nc])

(;B[pc];W[qc];B[oc];W[rb]
C['A' leads to fight, 'B' to a solidified position which is a little
better for White.]
LB[rd:B][qe:A]
(;B[qe];W[pe];B[qf];W[nd]C['A' is correct, 'B' is a mistake.]
LB[nc:B][mb:A]
(;B[mb];W[pf];B[rh])

(;B[nc];W[pf];B[rh];W[mc];B[mb];W[lc];B[lb];W[kc])
)

(;B[rd];W[od];B[nc];W[nd];B[mc];W[qe];B[re];W[qf];B[rc];W[qb];B[rf];
W[rg];B[sb];W[pm];B[nj];W[mg]C[End of joseki.]PL[2];W[sc]
C[Aji for a two-step-two-stage-ko in the corner.];B[sd];W[sa];B[ra];
W[qa])
)
)
)

(;B[pf];W[of];B[pe];W[og];B[nd];W[pk]
C['A' is a 15 points endgame sente move for Black.]LB[qg:A];B[qg];
W[qh];B[rg];W[rh];B[sh];W[si];B[sg];W[ri])

(;B[pi];W[qk]C['A' and 'B' are correct, 'C' and 'D' are mistakes.]
LB[od:D][ri:C][oj:B][pe:A]
(;B[pe];W[qi]C['A' is correct, 'B' and 'C' are mistakes.]
LB[ph:C][qh:B][pj:A]
(;B[pj]C['A' is correct, 'B' is disadvantageous.]LB[qj:B][qh:A]
(;W[qh];B[og]C['A' is correct, 'B' is a mistake.]LB[of:B][oh:A]
(;W[oh]C['A' is correct and easy, 'B' is unfavorable and complicated.]
LB[ph:B][of:A]
(;B[of];W[ph];B[nh];W[ni];B[mh];W[lj])

(;B[ph];W[of];B[ng];W[pf];B[qj];W[rj];B[rk]
C['A' is correct, 'B' is a mistake.]LB[rl:B][pk:A]
(;W[pk]C['A' is possible, 'B' is a mistake.]LB[ri:B][ni:A]
(;B[ni];W[ok];B[nj];W[ri]C[Still, White is happy.])

(;B[ri];W[sj];B[si];W[oj];B[sk];W[rj];B[sj];W[oi];B[rj];W[ok])
)

(;W[rl];B[qg];W[sk];B[qf])
)
)

(;W[of];B[pf];W[oh];B[ng];W[ph];B[nh])
)

(;W[qj];B[ph];W[qg];B[og];W[ke];B[ol];W[qn];B[of])
)

(;B[qh];W[ph];B[qg];W[qf];B[rf];W[pf];B[qe];W[oi];B[pj];W[qj];B[oj];
W[oe])

(;B[ph];W[qh];B[og];W[qg];B[pj];W[of];B[pf];W[ng];B[oh];W[nf];B[nd];
W[mi])
)

(;B[oj];W[pd]C['A' is correct, 'B' is a mistake.]LB[pe:B][pc:A]
(;B[pc];W[oc];B[qc]
C['A' is correct, 'B' is a little disadavantageous.]LB[pe:B][od:A]
(;W[od];B[pe];W[oe];B[pf];W[of];B[og];W[ng];B[oh];W[ke];B[qj];W[jc];
B[jb];W[jd];B[ic];W[kb];B[ib];W[lc];B[fc])

(;W[pe]C['A' is correct, 'B' is submissive.]LB[ob:B][nc:A]
(;B[nc];W[ob];B[od];W[nd];B[oe];W[ne];B[of];W[pf];B[og];W[oh];B[ng];
W[ph];B[nb];W[mh];B[mg];W[lg];B[nh];W[ni];B[mi];W[lh];B[oi];W[nj];
B[pb];W[qi];B[ok];W[nk];B[nl];W[lj];B[ol];W[rf];B[ql];W[rk];B[ll])

(;B[ob];W[nc];B[nb];W[mc];B[ke];W[mg])
)
)

(;B[pe];W[qc];B[qe];W[pc];B[ne];W[nc])
)

(;B[ri];W[nh];B[oj];W[od])

(;B[od];W[pc];B[pd];W[qi];B[qh];W[ph];B[qg];W[qf];B[rf];W[ri];B[pf];
W[rg];B[qe];W[rh];B[qf];W[pj];B[oi];W[nj]
C[If White has a stone in the lower right corner, White is happy,
because he still can activate White 6.
For doing so, he might aim at A to go outside or to the upper
left, or at B to threaten a living tapsi group.]
PL[2]LB[pc:6][rb:B][mc:A])
)
)

(;W[qf]C[Usual against the Chinese Opening.];AB[kc][dd]AW[dp][pp]
C['A' is correct.
'B' is possible, but disadvantageous in the context of this fuseki.]
LB[qh:B][od:A]
(;B[od];W[qi])

(;B[qh]C['A' is correct, 'B' is questionable.]LB[of:B][qc:A]
(;W[qc]C['A' or 'B'.]LB[pd:B][pc:A]
(;B[pc];W[pd];B[rc];W[qb];B[pe];W[od];B[qe];W[rb];B[ne];W[oe];B[of];
W[oc];B[pf])

(;B[pd];W[pc];B[od];W[rd];B[re];W[rc];B[qe];W[nc])
)

(;W[of];B[od];W[oh];B[pj];W[mf];B[md])
)
)

(;W[qc]C['A' is correct, 'B' is inferior.]LB[pd:B][pc:A]
(;B[pc]C['A' is ususal, 'B' is not recommended.]LB[rd:B][pd:A]
(;W[pd]C['A' is correct, 'B' not recommended.]LB[pb:B][oc:A]
(;B[oc];W[rd];B[qe]C['A' is correct, 'B' also makes life.]
LB[qb:B][re:A]
(;W[re]
C['A' is correct to enclose White, 'B' and 'C' keep the corner.]
LB[rc:C][qb:B][qf:A]
(;B[qf];W[qb];B[rf];W[sc])

(;B[qb];W[qf];B[rc];W[pe];B[qc];W[pg];B[of];W[pf])

(;B[rc];W[qb];B[rb];W[qf];B[pe]C['A' or 'B'.]LB[of:B][pf:A]
(;W[pf];B[oe];W[pj])

(;W[of];B[oe];W[ne];B[pf];W[pg];B[od];W[og];B[qg];W[qh];B[rf];W[rg];
B[qf];W[pi])
)
)

(;W[qb];B[re];W[sc]C['A' is correct, 'B' is disadvantageous.]
LB[se:B][pb:A]
(;B[pb];W[rb];B[se];W[sd])

(;B[se];W[pb]C['A' is correct, 'B' wrong.]LB[ra:B][ob:A]
(;B[ob];W[ra];B[pa];W[sb])

(;B[ra];W[ob];B[nc]
C[If pushing on 'A' isn't helpful due to additional stones not
shown, White lives on 'B'.]
LB[rb:B][nb:A]
(;W[nb];B[mc])

(;W[rb];B[sd];W[qa];B[nb];W[oa];B[rc];W[sb])
)
)
)
)

(;B[pb];W[qe];B[rd];W[re];B[rc];W[od])
)

(;W[rd]C['A' encloses a small group, 'B' starts a ko.]LB[rc:B][qb:A]
(;B[qb];W[rc];B[qe];W[rb];B[pb];W[re];B[qf];W[ra];B[rf];W[se])

(;B[rc];W[qb];B[rb];W[pd];B[qe];W[pb];B[oc];W[re];B[qf];W[ob];B[nc]
C['A' is correct, 'B' disadvantageous.]LB[sb:B][ra:A]
(;W[ra];B[sb];W[sc];B[sd];W[se];B[rf];W[sc])

(;W[sb];B[sc];W[ra];B[sa])
)
)
)

(;B[pd]C[Same variation as Black 3 played before Black 1.]
LB[pd:3][qd:1])
)
)

(;B[pd]
C[
Hoshi = Hwajeom, Seongjeom = Xingwei` = Star Point
---------------------------------------------------------

The star or hoshi (4-4) point, emphasizing influence at the potential
expense of territory.

The first experiments with the star point were around 1840 in
Japan; its first appearances in pro games date to the early 1900's.
Its rise to preeminence came during the 'New Fuseki' movement
in Japan in the mid-1930's.

White approaches with 'a *', 'b *', 'c *' or 'd *'. White 'a'
is the standard approach move, the variations after it cover
the great majority of hoshi joseki.
Other approaches invite a local loss, but may make sense strategically.

'e' covers White playing elsewhere. These variations show White
approaches when there are multiple Black stones locally.

'f' shows the too early sansan invasion (which is not joseki).

'g *' shows a splitting move (esp. when Black has already played at
the top).

'h' is feasible if strategically sensible.

'i' is a move on the side preparing to approach from the other
side.

'j', 'k' and 'l' are covered in another branching.

g7, f6, e5, d4, c3, b2, a1
]
LB[re:l][rd:k][qj:j][qh:i][qd:h][qi:g][qc:f][dp:e][qg:d][pg:c][pf:b][qf:a]
(;W[qf]
C[
Ikken Kakari = Hankan Keolch'im = Yi Gua`jiao~ = 1-Space Low Approach
----------------------------------------------------------------------

White 2 is the standard approach move to the 4-4.

Black joseki responses range from 'a *', 'b *', 'c *', 'd *', 'e *', 'g *', 'h *', 'i *', 'm' or 'n'. 

The variations after 'a *' and 'b *' should be studied together
to understand similarities and differences.

'c *' leads to much more complications than the other answers,
but White can simplify.

'd' is called Tsuke-Nobi-Joseki. Its shape also occurs on the
side without corner. Kyu and low dan players should totally avoid
playing this variation, regard it as bad move and instead play an
extension (a - c) or a pincer.

Black needs the ladder for 'e *'. An additional stone on  n  is also very helpful.

'f' is not generally favorable for Black, nor joseki. 'f' is better than 'i', if there's a Black stone on the triangled point.

'j', 'k' and 'l' show special strategies based upon the fuseki.

'o' shows Black ignoring the approach move (White 2) and invasion into different extensions and moyos based on the Hoshi.

'p' shows the greedy play of using the star point immediately
for territory.

'q' is possible if White is not on the top side.

'r' is a trick play.

's' is covered in two other branches.

o15, n14, m13, l12, k11, j10, i9, h8, g7, f6, e5, d4, c3, b2,
a1
]
LB[nd:a][nc:b][mc:c][pf:d][qh:e][qi:f][qj:g][ph:h][pi:i][pj:j][oe:k][of:l][pg:m][jd:n][dp:o][re:p][qc:q][rf:r][qe:s]
TR[pq]
(;B[nd]
C[
Ikken-Tobi (1-space jump)
----------------------------

White responses range from 'a' to 'f *' or 'l' or 'n'.

White may also play elsewhere ('g').

If White already has a stone on the triangled point, he may slide
to 'h *', 'i *' or 'j *'.

'k' and 'm' are invasions.

'n' can be more preferable than 'c' in six stone handicap games.

g7, f6, e5, d4, c3, b2, a1
]
LB[pi:n][md:m][qi:l][ld:k][pb:j][ob:i][nb:h][dp:g][lc:f][qd:e][qc:d][pj:c][qj:b][rd:a]
TR[jc]
(;W[rd]
C[Black continues with 'a' to 'c'. For a good result, Black must
have the ladder to play 'c'.

Black 'd' is hasty. 'e' is also possible.]
LB[pg:e][jc:d][qg:c][qh:b][qc:a]
(;B[qc]
C[White continues with 'a'. 
Playing elsewhere ('b') is a mistake. 
A White play at 'c' is too far.]
LB[qj:c][dp:b][qi:a]
(;W[qi]
C[Black continues with 'a'. If Black plays elsewhere, White has
a strong followup.]
LB[dp:b][jc:a]
(;B[jc])

(;B[tt]C[Black plays elsewhere.];W[lc];B[rc]
C[Black plays 9 to establish a base.])
)

(;W[dp]C[White plays elsewhere, a mistake.];B[qh];W[of];B[oh];W[mf];
B[ld]
C[If White is going to play elsewhere, it is better not to have
played White 4.])

(;W[qj]C[White overextends with 6.];B[qh];W[rh];B[ri];W[qi];B[rg];
W[ph];B[qg];W[pg];B[rf];W[qe];B[pf]
C[Black 17 catches the three White corner stones.])
)

(;B[qh]
C[Black 5 emphasizes the right side at the expense of losing the
better part of the corner.

White continues with 'a' or 'b'.]
LB[qg:b][qc:a]
(;W[qc];B[qe]
C[Black continues with 'a' or 'b'. White must have the ladder to
play 'b'.]
LB[pe:b][re:a]
(;W[re];B[pf]
C[White continues with 'a' or 'b'. White must have the ladder to
play 'b'. White 'c' is a mistake.]
LB[qg:c][pg:b][nb:a]
(;W[nb];B[rf];W[oc])

(;W[pg]C[Black continues with 'a' or 'b', regardless of the ladder.]
LB[rf:b][qg:a]
(;B[qg];W[rf]
C[White must have the ladder. Black being able to catch White 10
in a ladder gives Black a significant advantage.]
;B[of]
C[Black extends if the ladder is unfavorable. The presence of the
cutting stone gives White a better result than the other variation.])

(;B[rf];W[qg];B[rg];W[og]
C[White 14 is correct. The atari at 'a' is vulgar, as it destroys
aji.]
LB[of:a];B[pc];W[pb];B[ob];W[qb];B[pi])
)

(;W[qg]C[White 10 is a mistake, as Black gets powerful thickness.];
B[pg];W[rh];B[ri];W[rg];B[qi])
)

(;W[pe]C[White must have the ladder to play 8 this way.];B[pf];W[oe];
B[qd];W[od];B[pc];W[oc];B[pb];W[pg];B[rf];W[of];B[re])
)

(;W[qg];B[ph];W[qc];B[og])
)

(;B[qg]
C[Black 5 is a recent Korean innovation. Black must have the ladder
to the lower left corner to play this way.

White continues with 'a'. White 'b' is possible only with the
ladder.]
LB[rg:b][pg:a]
(;W[pg]LB[qh:A][qe:B][pf:C]C['A' is correct, 'B' and 'C' are wrong.
]
(;B[qh]
C[After White 'a' Black gets the corner and White will aim at attacking
the right side group. White 'b' grabs the corner in exchange
for black thickness. White 'c' also aims at the right side, but
creates more eye shape.]
LB[ph:c][qc:b][rf:a]
(;W[rf];B[qc];W[ph];B[qi];W[pi];B[qj];W[oc];B[od];W[of]
C[White 14 is the right timing. If White played it after 16, Black
would respond by peeping at 'a' and blocking at 'b'.]
LB[nc:b][pe:a])

(;W[qc]
C[White goes for the corner.

Black can play 'a' and build thickness, or 'b' if he is concerned
about the top and wants to block in sente.]
LB[rf:b][pf:a]
(;B[pf];W[rf];B[of];W[ob]
C[The white slide to 12 is a little painful, but avoids bad aji
in the corner.])

(;B[rf];W[qe];B[pc];W[re];B[ph];W[of];B[ng];W[nf];B[kc];W[mg];B[ni])
)

(;W[ph]
C[Black can play 'a', or 'b' if he wants to preserve the option
of cutting between 2 and 6.]
LB[rf:b][qi:a]
(;B[qi];W[pe]
C[Black can play 'a', or 'b' if he wants to make it a bit more
difficult for White to make eye shape.]
LB[qd:b][qc:a]
(;B[qc];W[od];B[oc];W[oe];B[nc];W[qd])

(;B[qd];W[od];B[oc];W[oe]
C[Black can play 'a' if he values the top, or 'b' when he wants
to continue and deny White eye shape.]
LB[pc:b][nc:a]
(;B[nc];W[rc];B[qb];W[rf])

(;B[pc];W[re];B[rc]
C[This is often seen in professional play and consistent with the
original intention of Black 5: making life tough for White.])
)
)

(;B[rf];W[qe]C['A' or 'B'.]LB[qi:B][qj:A]
(;B[qj];W[pi];B[rk];W[qc];B[pc];W[re])

(;B[qi];W[qc];B[pc];W[re];B[pi])
)
)
)

(;B[qe];W[re];B[pf];W[rf];B[qh];W[ph];B[qi];W[of];B[pe];W[qc])

(;B[pf]LB[qe:A][qh:B]C['A' punishes, 'B' fails to do so.
]
(;W[qe]LB[qh:A][of:B]C['A' or 'B' don't help.
]
(;B[qh];W[pe];B[of];W[oe];B[nf];W[ne];B[mf];W[me])

(;B[of];W[qh])
)

(;W[qh];B[qe];W[rg];B[re])
)
)

(;W[rg]
C[The only way White gets a good result is if the ladder to the
lower left corner favors White. Black should not have have played
Black 5 if this is the case.]
;B[rf]
C[White 'a' is obvious, and yields White a disadvantageous low
position, but is the best White can do. 

White 'b' also yields White a disadvantageous low position, but
leaves a White stone in a ladder to the lower left, offering
a ladder breaker at the cost of giving Black a strong ponnuki
shape.

White 'c' is unreasonable, unless White has a favorable ladder
to the lower left corner. If that is the case, Black has made
a big mistake in playing Black 5.]
LB[pg:c][qh:b][re:a]
(;W[re];B[pf];W[sf];B[qh]
C[Black is satisfied, as White has a low position, and Black's
thickness is clearly superior.

'a' remains a big middle-game (chubansen) point.]
LB[qc:a])

(;W[qh];B[pg];W[re];B[rh];W[sf];B[qi]
C[This is good for Black: White is in a low position again. While
White has a play for the ladder breaker to White 8, the resultant
ponnuki shape gives Black incredible strength.]
;W[hp]C[White plays the ladder breaker.];B[ph]
C[Black must take with 15. Black's thickness is impressive.])

(;W[pg]C[White must have the ladder to play this way.];B[qh];W[rh];
B[qe];W[pf];B[re];W[qi]C[Later White can live on A.]PL[2]LB[qc:A];
W[qc];B[pc];W[rb]C['A' is correct, 'B' doesn't kill.]LB[sc:B][pb:A]
(;B[pb]C['A' is correct, gives life, 'B' wrong, ko.]LB[sc:B][qd:A]
(;W[qd]C['A' or 'B' don't kill.]LB[qb:B][pe:A]
(;B[pe];W[sc])

(;B[qb];W[pe];B[sd];W[rc];B[sc];W[sf])
)

(;W[sc];B[qb];W[qd];B[ra];W[pe];B[sb])
)

(;B[sc];W[pb];B[ob];W[qa];B[sd];W[sb])
)
)
)

(;B[jc]
C[Black 5 is not recommended, as it is premature, letting White
settle himself too easily.]
;W[qc];B[pc]
C[White no longer needs to play at 'a' to secure a base, so may
play elsewhere.]
LB[qi:a])

(;B[pg];W[pf];B[qg];W[of];B[rf];W[re];B[rg];W[oc];B[od];W[pc];B[qc];
W[qd];B[qb];W[nc];B[mc];W[mb];B[lb]C['A' is correct, 'B' a mistake.]
LB[md:B][nb:A]
(;W[nb];B[md];W[pb];B[ng];W[nf];B[mf])

(;W[md];B[lc];W[ne];B[ob];W[nb];B[na];W[pb];B[pa]C[Ko])
)
)

(;W[qj]C['A', 'B' or 'C'.]LB[qh:C][ql:B][jc:A]
(;B[jc]
C[White continues with 'a' or 'b'. Black meanwhile would like to
defend the corner at 'c' or 'd' prior to invading at 'e'. If
Black invades at 'e' without defending the corner, White will
dodge that invasion by invading the corner with 'a'.]
LB[qh:e][rd:d][qd:c][md:b][qc:a]
(;W[qc];B[qd];W[rd]C[Black continues with 'a' or 'b'.]LB[pc:b][re:a]
(;B[re]C['A' or 'B'.]LB[rb:B][rc:A]
(;W[rc];B[qe];W[ob];B[nb];W[oc];B[nc]
C['A' is necessary, tenuki 'B' is bad.]LB[dp:B][od:A]
(;W[od];B[oe]
C['A' is necessary, tenuki 'B' is a mistake. 'C' is possible.]
LB[ne:C][dp:B][pc:A]
(;W[pc];B[ne]C[Later, White has A and B.]LB[pf:B][rf:A])

(;W[dp];B[oa];W[pb];B[sd];W[ra];B[sb])

(;W[ne];B[of];W[me];B[ld];W[pc])
)

(;W[dp];B[oa];W[pa];B[ra];W[pc];B[na];W[qb];B[qa])
)

(;W[rb];B[sd];W[rc];B[qe];W[nb];B[mb];W[ob];B[mc])
)

(;B[pc];W[rb];B[qb];W[rc])
)

(;W[md]
C[Black continues with 'a' or 'b'. Black 'a' works best with Black
has the top-left corner. Black plays 'b' when the top-left corner
is White's.
'c' is possible.]
LB[me:c][mc:b][ne:a]
(;B[ne]AB[dd]
C[Black plays 2 only when he has support in the top-right corner.];
W[kd];B[jd];W[ke];B[je];W[kf];B[ig];W[kh];B[df])

(;B[mc]AW[dd]
C[With White in the top-right corner, Black 7 is correct.];W[lc];B[ld]
;W[me]
C[Black continues with 'a'. Black 'b' is a mistake. Push on the
side of the cut is the rule.

Black 'c' is cowardly.]
LB[nc:c][ne:b][le:a]
(;B[le];W[nc];B[mb]
C[White continues with 'a'. White 'b' is not recommended.]
LB[oc:b][mf:a]
(;W[mf];B[nb];W[lf];B[je]C[Joseki ends.];W[jf]
C[White 18 is a suggested local follow-up.])

(;W[oc]C[White 14 is not recommended.];B[od];W[lb];B[mf];W[ne];B[nf];
W[oe];B[pf];W[nb];B[pe];W[ma];B[mc];W[mb];B[qg])
)

(;B[ne]C[Black 11 is a mistake.];W[kd];B[le];W[mf];B[kc];W[lb]
C['a' and 'b' are miai. Black is in a losing situation.]LB[ke:b][nc:a])

(;B[nc]C[Black 11 is a mistake.];W[kd];B[lb];W[le];B[kb])
)

(;B[me]C['A', 'B' or 'C'.]LB[nc:C][kd:B][ld:A]
(;W[ld]C['A' or 'B'.]LB[nc:B][ne:A]
(;B[ne];W[le];B[je];W[lg];B[rd])

(;B[nc]C['A' or 'B'.]LB[mb:B][le:A]
(;W[le];B[lb])

(;W[mb];B[je];W[le];B[mf];W[lf];B[mg])
)
)

(;W[kd];B[jd];W[ke];B[mc];W[kc];B[je];W[kf];B[jf];W[kg];B[rd])

(;W[nc];B[ld];W[mc];B[oc]C['A' is correct, 'B' is wrong.]
LB[ne:B][le:A]
(;W[le];B[ne];W[kd];B[lc];W[kc];B[lb];W[kb];B[nb])

(;W[ne];B[od];W[kb];B[lc];W[le];B[mf];W[lb];B[ob])
)
)
)
)

(;B[ql]C['A' and 'B' are correct, 'C' is a mistake.]
LB[ph:C][oj:B][rd:A]
(;W[rd];B[qh];W[qc];B[oh])

(;W[oj];B[qh];W[pg];B[rd];W[ph])

(;W[ph];B[qe];W[pf])
)

(;B[qh]C['A' is correct, 'B' is a mistake.]LB[of:B][rh:A]
(;W[rh];B[ri];W[qi];B[rg];W[ph];B[qg];W[pg];B[pf];W[rf];B[sh]
C['A' sacrifices for influence, 'B' takes the corner.]LB[qd:B][sf:A]
(;W[sf];B[sg];W[rj];B[qe];W[of];B[pe]
C[White has aji on A. White B is sente.]LB[sk:B][qc:A])

(;W[qd];B[pe];W[qc];B[rj];W[qk];B[rk];W[ql];B[pc];W[pb];B[ob];W[qb])
)

(;W[of]C[See the given order of moves for the punishment.]
LB[qj:6][nd:5][of:4][qh:3][qf:2][pd:1])
)
)

(;W[pj]
C['A' is correct.
'B' is good with six handicap stones.
'C' is a handicap continuation for White.]
LB[jd:C][qh:B][jc:A]
(;B[jc]
C[Black hopes to strengthen the corner, White to invade the corner.
White can reduce on 'A', or, with an additional stone on the triangled position, invade on 'B'.
]
LB[md:A][lc:B]TR[hc]
(;W[md]LB[ne:B][mc:A]
(;B[mc];W[lc];B[ld];W[me]LB[le:B][nc:A]
(;B[nc]PL[2])

(;B[le];W[nc];B[mb]LB[oc:C][od:B][mf:A]
(;W[mf];B[nb];W[lf];B[je])

(;W[od];B[ne];W[oe];B[mf];W[pc])

(;W[oc];B[od];W[lb];B[mf];W[ne];B[nf];W[oe];B[pf];W[ma];B[pe];W[nb];
B[mc];W[mb];B[qg])
)
)

(;B[ne]LB[mc:B][kd:A]
(;W[kd];B[jd];W[kf];B[je];W[mf];B[nf])

(;W[mc];B[ke];W[pb];B[pc];W[ob];B[qb];W[kc];B[jd])
)
)

(;AW[hc];W[lc]LB[ld:A][kd:B]C['A' or 'B'are ok.
]
(;B[ld]LB[mc:A][kc:B]
C['A' if White is strong in the upper left, else 'B'.
]
(;W[mc];B[md];W[kc]LB[kd:A][jd:B]
C['A' is ok, 'B' is not recommended.
]
(;B[kd];W[jb]LB[nc:A][jd:B]C['A' or 'B'.
]
(;B[nc])

(;B[jd];W[kb])
)

(;B[jd];W[kd];B[ke];W[jb];B[ib];W[kb];B[ic];W[pb])
)

(;W[kc];B[kd];W[jb];B[mc])
)

(;B[kd]LB[oc:A][ld:B]C['A' or 'B' are ok.
]
(;W[oc]LB[nc:A][od:B]C['A' or 'B' are ok.
]
(;B[nc];W[od];B[oe];W[pc];B[qd];W[qc];B[pe];W[nb];B[mb];W[ob];B[mc])

(;B[od];W[pc];B[nc];W[nb];B[mb];W[ob];B[mc];W[rd])
)

(;W[ld];B[le];W[jb];B[ib];W[kb];B[ic];W[nb];B[ob];W[mb]LB[oc:A][la:B]
C['A' or 'B' don't kill.
]
(;B[oc];W[la])

(;B[la];W[oc];B[pb];W[nc];B[md];W[od];B[oe];W[ne];B[me];W[pe];B[of];
W[pc];B[qd];W[qb])
)
)
)
)

(;AB[np][pp]AW[qn];B[qh]C['A' or 'B' are ok.]LB[pg:B][ph:A]
(;W[ph]C['A' is correct, 'B' is a mistake.]LB[pg:B][pi:A]
(;B[pi]C['A' is correct, 'B' is a mistake.]LB[qi:B][oi:A]
(;W[oi];B[qi];W[pg];B[qj];W[pk];B[rl];W[pm];B[rg];W[rf];B[rd])

(;W[qi];B[oi];W[rh];B[qj];W[qg];B[ri];W[qh];B[qk])
)

(;B[pg];W[qg];B[pi];W[oh];B[qj];W[oi];B[qi];W[pk])
)

(;W[pg];B[qj];W[pk];B[qk];W[pl];B[ph];W[oh];B[rf];W[re];B[rg];W[qe];
B[ri])
)

(;B[jd]LB[ld:A][lc:B]C['A' or 'B' are later continuations.
]
(;W[ld];B[ke];W[le];B[lf];W[me];B[pf];W[pg];B[og];W[of];B[nf];W[pe];
B[ne])

(;W[lc]C['A' or 'B'.]LB[jc:B][ld:A]
(;B[ld];W[mc];B[md];W[jc];B[ic];W[kc];B[id];W[pb])

(;B[jc];W[oc];B[od];W[pc];B[nc];W[nb];B[mb];W[ob];B[mc];W[rd])
)
)
)

(;W[qc]
C[White invades. This is a special strategy, usually because of
a pincer behind White 2.]
;B[qd];W[rd]
C[Black builds a wall to the right on 'A' or defends territory
on the top with 'B'.]
LB[pc:B][re:A]
(;B[re]C[White continues with 'a' or 'b'.]LB[rb:b][rc:a]
(;W[rc];B[qe];W[ob]
C[Black continues with 'a', possibly 'b'. Black 'c is too mild.
'b' is urgent if there is an additional Black stone on or near
the triangled position.]
LB[mc:c][nb:b][pf:a]TR[jd]
(;B[pf]AB[mc]C[Black 11 is a thick move.])

(;B[nb]C['A' or 'B'.]LB[pb:B][oc:A]
(;W[oc];B[nc]
C['A' lives in gote, 'B' in sente.
Tenuki 'C' is a mistake and leads to a ko.]
LB[dp:C][pc:B][od:A]
(;W[od];B[oe]
C['A' leaves the cut at B for later.
Cutting immeadiately on 'B' makes the corner territory smaller.]
LB[ne:B][pc:A]
(;W[pc])

(;W[ne]C['A' is better than 'B'.]LB[of:B][pc:A]
(;B[pc];W[pb];B[oa];W[qa];B[of]
C['A' is necessary if the cut 16 should make sense.
Tenuki 'B' loses 4 stones in gote.]
LB[ne:16][dp:B][rb:A]
(;W[rb])

(;W[dp];B[na];W[sb];B[qb];W[rb];B[pa];W[sd];B[qb];W[pb])
)

(;B[of]C['A' is correct, 'B' is a mistake.]LB[me:B][pc:A]
(;W[pc])

(;W[me];B[ld];W[mg];B[ng];W[mh];B[oa])
)
)
)

(;W[pc];B[od])

(;W[dp];B[oa];W[pa];B[ra];W[pc];B[na];W[sd];B[pb];W[qb];B[qa];W[rb];
B[pb])
)

(;W[pb])
)

(;B[mc])
)

(;W[rb];B[sd];W[rc];B[qe];W[nb]
C[White can extend further because of the strength of the four
White stones.

Joseki continues with Black 'a'. Black 'b' is a trick play.]
LB[ob:b][pf:a]
(;B[pf])

(;B[ob]C[White continues with 'a'. White 'b' is a mistake.]
LB[oc:b][pb:a]
(;W[pb];B[oc];W[oa];B[mb]
C[White must play 'a' to live in the corner. White cannot play
elsewhere ('b').]
LB[dp:b][qa:a]
(;W[qa]C[White must play 18 to live.])

(;W[tt]C[White plays elsewhere, a mistake.];B[qa];W[pa];B[ra]
C['a' and 'b' are miai. White is dead.]LB[sa:b][sc:a])
)

(;W[oc];B[pb];W[pc];B[mb];W[nc];B[mc]
C[White continues with 'a' or 'b'.]LB[oa:b][od:a]
(;W[od]C[Black continues with 'a'. Black 'b' is unreasonable.]
LB[oe:b][pf:a]
(;B[pf];W[ne];B[md];W[oe]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[na:b][qg:a]
(;B[qg];W[oa])

(;B[na]C[Black 25 is a mistake.];W[pe];B[rf];W[qg];B[rg]
C[Black must crawl along the second line, the line of defeat.];W[qh];
B[rh];W[qi];B[ri];W[qj])
)

(;B[oe]C[Black 21 is a mistake.];W[ne]
C[Neither Black 'a' nor 'b' are any good.]LB[of:b][md:a]
(;B[md];W[of];B[pe];W[pf]C[Black cannot escape.])

(;B[of];W[md]C[The result is a disaster for Black.])
)
)

(;W[oa]C[White holds the push at 'a in reserve.]LB[od:a])
)
)
)
)

(;AB[jc][je];B[pc];W[rb];B[qb];W[rc])
)

(;W[qd]AB[qj]
C[Black 4 may be played when Black has a pincer as shown.];B[qc]AB[qj]
C[White continues with 'a' or 'b'.]LB[pe:b][rc:a]
(;W[rc]
C[Black continues with 'a' to 'c'. Black 'a' is simple, 'b' severe,
and 'c' the toughest.]
LB[qe:c][rb:b][pc:a]
(;B[pc];W[re];B[jc])

(;B[rb]
C[Black 7 is tough-minded.

White continues with 'a'. White 'b' is weak. 'c' is territorially
ingerior, but enables White to go to the top side.]
LB[pc:c][rd:b][re:a]
(;W[re];B[sc]
C[White continues with 'a'; a favorable ladder to the lower left
helps. White 'b' is unthinkable. White 'c' is a mistake.]
LB[rd:c][sd:b][pe:a]
(;W[pe]C[Black continues with 'a' or 'b'.]LB[rd:b][od:a]
(;B[od];W[rd];B[pb])

(;B[rd];W[od];B[qe];W[pc];B[qd]
C[White continues with 'a' if the ladder to the lower right is
favorable, 'b' if not. White 'b' is bad for White.]
LB[oc:b][oe:a]
(;W[oe]C[White must have the ladder to play this way.];B[oc];W[nc];
B[pb];W[ob];B[pc];W[md];B[pf];W[ne];B[pg]
C[Black gets a large area, White gets sente.])

(;W[oc]
C[White must play 16 with an unfavorable ladder to the lower left,
but the result is awful.]
;B[oe];W[ne];B[pf];W[of];B[pe];W[md];B[nf];W[me];B[og])
)
)

(;W[sd]C[White 10 is a mistake.];B[rd]
C[White does not have a ko threat big enough to stop Black 'a'.]
LB[qe:a])

(;W[rd]C[White 10 is a mistake.];B[pc])
)

(;W[rd]C[White 8 is not recommended.];B[pc];W[qh];B[jc])

(;W[pc];B[qb];W[od];B[pe];W[oe];B[pf];W[oc];B[qe])
)

(;B[qe]C[Black 7 is double tough.];W[rd];B[re]
C[White continues with 'a' or 'b'.]LB[pe:b][pc:a]
(;W[pc];B[pe];W[oc];B[nc])

(;W[pe];B[rf];W[pf];B[qg];W[pg];B[qh]C['A' or 'B'.]LB[pc:B][od:A]
(;W[od];B[pc];W[oc];B[ob];W[nc]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[rb:b][nb:a]
(;B[nb];W[mc];B[rb])

(;B[rb];W[nb]
C[Black continues with 'a'. If Black plays elsewhere, White gets
a two-step ko.]
LB[dp:b][pb:a]
(;B[pb])

(;B[tt]C[Black plays elsewhere. White can get a two-step ko.];W[qb];
B[pb];W[ra]
C[Black continues with 'a' and White has a two-step ko. Black 'b'
gives White a ko.]
LB[sb:b][qa:a]
(;B[qa]C[Black 26 and White has a two-step ko.];W[sb]
C[White has a "flower-viewing" ko (that is, nothing to lose).])

(;B[sb]C[Black 26 and White has a simple ko.];W[pa])
)
)
)

(;W[pc];B[od];W[pb];B[ng])
)
)
)

(;W[pe]
C[Black continues with 'a' or 'c'. Black 'b' is not recommended.]
LB[rd:c][pc:b][od:a]
(;B[od];W[rc]C['A' or 'B'.]LB[qb:B][rd:A]
(;B[rd];W[re])

(;B[qb];W[rb])
)

(;B[pc]C[Black 7 is not recommended.];W[ne];B[md];W[oj])

(;B[rd]C['A' to emphasize the right, 'B' for the top side.]
LB[od:B][re:A]
(;W[re];B[oe];W[rc];B[qe])

(;W[od];B[qe];W[pc];B[qd]C['A' with the ladder, 'B' without.]
LB[oc:B][oe:A]
(;W[oe];B[oc];W[nc];B[pb];W[ob];B[pc];W[md];B[pf];W[ne];B[pg])

(;W[oc];B[oe];W[ne]C['A' or 'B' are ok.]LB[pf:B][of:A]
(;B[of];W[md];B[nf];W[me];B[mf])

(;B[pf];W[of];B[pe];W[md];B[nf];W[nc];B[og])
)
)
)
)
)

(;W[lc]
C[Black plays a pincer at 'a *' or 'e' if there is Black support
at top, 'b' if Black support at right, or the balanced 'c'. Black
'd' is a mistake.

d4, c3, b2, a1]
LB[id:e][mc:d][me:c][qj:b][ic:a]
(;B[ic]AB[dd]
C[With a star-point stone at the top, Black 5 is a powerful pincer.

White continues with 'a *', 'b *' or 'c *'. White 'd *' is a
trick play. White 'e' is the vague sort of move found in handicap
Go. White 'f' is a hopeless move.

f6, e5, d4, c3, b2, a1]
LB[nb:f][ie:e][oe:d][oc:c][me:b][le:a]
(;W[le];B[nf]
C[White continues with 'a'. Trying to split Black with 'b' is reckless.
'c' is not recommended.
'd *' leads to an interesting fight..
'e' is possible.]
LB[pf:e][pg:d][oe:c][fd:b][ie:a]
(;W[ie];B[gd];W[pg];B[qe]
C[Black 11 defends against the peep at the triangled position.
'A' or 'B'.]
LB[qc:B][re:A]TR[oe]
(;W[re]C[Black 12 is not recommended.];B[rd];W[pe];B[qd];W[oe];B[ne];
W[od];B[oc];W[nc];B[mc];W[nb];B[mb]
C[White may try 'a' or 'b'. Neither work.]LB[ob:b][pc:a]
(;W[pc];B[ob];W[pb];B[na];W[rc];B[rf];W[rg];B[se]
C['a' and 'b' are miai. Black 'b' starts a capture squeeze.]
LB[pf:b][qc:a];W[qc];B[pf];W[of];B[og];W[pf];B[ph];W[qg];B[qh])

(;W[ob];B[pc];W[md];B[lb];W[kb];B[kc];W[kd]
C[White sets up a ko, but can't expect to win it.])
)

(;W[qc];B[re]C['A' for the corner, 'B' for the outside.]LB[ob:B][oc:A]
(;W[oc];B[pc];W[pb];B[nb];W[ob];B[nc];W[rb];B[od])

(;W[nb];B[pb];W[oe];B[ne];W[oc];B[pc];W[od];B[of];W[pf];B[pe];W[ob];
B[rf];W[oh];B[nh];W[ni];B[mh])
)
)

(;W[fd]C[White 8 is a mistake.];B[ie];W[df];B[kd];W[ld];B[lf];W[kf];
B[ke];W[mf];B[lg];W[me];B[mg];W[ne];B[oe]
C[White cannot break through. In his struggle for life, White hands
Black the game by giving overwhelming thickness.])

(;W[oe];B[pe];W[of];B[pf];W[og];B[pg])

(;W[pg];B[qe]C['A' is correct, 'B' is a mistake.

* GOOD VARIATION *]
LB[re:B][qc:A]
(;W[qc];B[re]
C['A' hunts on the outside, 'B' takes a small enclosed corner for
hunge influence.]
LB[oc:B][nb:A]
(;W[nb];B[pb];W[oe];B[ne];W[oc];B[pc];W[od];B[of];W[pf];B[pe];W[ob];
B[rf];W[oh];B[nh];W[ni];B[mh])

(;W[oc];B[pc];W[pb];B[nb];W[ob];B[od];W[rb];B[nc])
)

(;W[re];B[rd];W[pe];B[qd];W[oe];B[ne];W[od];B[oc];W[nc];B[mc];W[nb];
B[mb];W[pc];B[ob];W[rc];B[rf];W[rg];B[se];W[qc];B[pf];W[of];B[og];
W[pf];B[ph];W[qg];B[qh])
)

(;W[pf];B[of];W[nb];B[pb];W[ie];B[gd];W[rd];B[nc];W[mb];B[qc])
)

(;W[me]
C[Black continues with 'a *' to 'c'. Black 'd' is mischief making,
a fight Black does not need.]
LB[md:d][of:c][pf:b][nf:a]
(;B[nf]C['A *' is correct, 'B' is a mistake. 'C' is possible.]
LB[mf:C][ne:B][pg:A]
(;W[pg];B[ne]C[
* GOOD VARIATION *];W[ke];B[ie])

(;W[ne];B[oe];W[of];B[pf];W[og];B[pg];W[oh];B[ph];W[oi]
C[Black can cut on A.]LB[md:A])

(;W[mf];B[pg];W[qh];B[pf];W[qe];B[qd])
)

(;B[pf];W[pg];B[of]C[White continues with 'a' or 'b'.]LB[qd:b][re:a]
(;W[re]C[Black continues with 'a' or 'b'.]LB[rd:b][qe:a]
(;B[qe];W[qd];B[pe];W[rg];B[qc];W[rd];B[og];W[ph];B[mg])

(;B[rd];W[qd];B[qc];W[qe];B[rc]
C[White continues with 'a'. White 'b' is a mistake.'c' is inferior,
it captures the corner for huge outside influence.]
LB[pe:c][oc:b][qj:a]
(;W[qj];B[nc])

(;W[oc]C[White 16 looks tough, but is a mistake.];B[nc];W[nb];B[ob]
C[Black 19 is a tesuji.];W[pb];B[pc];W[oa];B[od]
C[White has gained trouble. 'a' and 'b' are miai.]LB[pi:b][ld:a])

(;W[pe];B[oe];W[pc];B[od];W[oc];B[nc];W[nb];B[mb];W[qb];B[rb];W[ob];
B[na];W[pa])
)
)

(;W[qd];B[qc];W[qe];B[pb]C[Black 13 is the way to make shape.];W[nb]
C[If White tries 14....];B[nc]C[Black is unaffected.])
)

(;B[of]
C[The shape of the three Black stones is called a "sake bottle".];
W[ph];B[ng];W[rd];B[qc];W[je];B[hd])

(;B[md]C[Black starts a fight.];W[ld];B[le];W[mf];B[ke];W[mb]
C[White 12 makes miai of 'a' and 'b'.]LB[jd:b][oc:a])
)

(;W[oc];B[od]
C[White continues with 'a *'. White 'b' to 'd' are not as favorable.

d4, c3, b2, a1]
LB[pb:d][nb:c][pc:b][nc:a]
(;W[nc]C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[pc:b][md:a]
(;B[md]
C[White continues with 'a *'. White 'b', 'c' and 'd' are not recommended.]
LB[kc:d][ld:c][kb:b][pc:a]
(;W[pc];B[mc];W[mb];B[qc];W[kb];B[pb];W[ob];B[oa];W[nb];B[rb];W[le];
B[ng]C[
* GOOD VARIATION *])

(;W[kb]C[White 10 is not recommended.];B[kd];W[pc]C['A' or 'B'-]
LB[qc:B][mc:A]
(;B[mc];W[mb];B[qc];W[qb]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[rb:b][rd:a]
(;B[rd]C[Black is at the advantage. 'a' and 'b' are miai.]
LB[pi:b][rb:a])

(;B[rb]C[Black 17 is an overplay.];W[qd];B[rc];W[pe];B[pb];W[ob];B[qa]
;W[ld]
C[Black cannot now block at 'a'; White can break through to the
right or left (Black can stop one, but not both).]
LB[le:a])
)

(;B[qc]C['A' or 'B'.]LB[qd:B][qb:A]
(;W[qb];B[rd];W[ld];B[le];W[ke];B[kc];W[lb];B[lf])

(;W[qd];B[qe];W[rd];B[re];W[rc];B[pf])
)
)

(;W[ld]C[White 10 is not recommended.];B[mc];W[mb];B[nb]
C[White 'a' is better than 'b'.]LB[ob:b][lb:a]
(;W[lb];B[ob])

(;W[ob];B[lb];W[na];B[kb]
C[White continues with 'a'. White 'b' is worse.]LB[qc:b][le:a]
(;W[le];B[qb];W[pb];B[qd];W[pa];B[pg])

(;W[qc];B[qd];W[rc];B[le])
)
)

(;W[kc];B[pc];W[ke];B[ie];W[kg];B[qe];W[pf];B[nf]
C[Black has a much better position.])
)

(;B[pc]C[The exchange of Black 9 for White 'a' is disadvantageous.]
LB[md:a];W[md];B[qe];W[pf];B[nf];W[pi])
)

(;W[pc];B[nc];W[nb];B[mb];W[ob];B[mc];W[rd];B[ld])

(;W[nb]
C[Black continues with 'a'. Black 'b' looks better than it is.
After looking at Black 'b', Black 'c' seems logical, but is not
recommended.]
LB[qe:c][pc:b][mc:a]
(;B[mc];W[mb];B[ld];W[kc];B[kd];W[qc];B[qd];W[rc];B[jc])

(;B[pc]C[Black 9 is not recommended.];W[pb];B[nc];W[ob];B[qb];W[rd];
B[rc];W[qd];B[qc];W[le]C[Black only has one eye in the corner.])

(;B[qe]C[Black 9 is not recommended.];W[pf];B[pc];W[pb];B[nc];W[ob];
B[qb];W[le];B[dp]C[Black plays elsewhere.];W[rb];B[qa];W[rd]
C[Black has serious trouble.])
)

(;W[pb]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pc:b][qc:a]
(;B[qc]
C[White continues with 'a'. White 'b' is a mistake. White 'c' gives
Black great thickness.]
LB[qb:c][le:b][mc:a]
(;W[mc]C[White 10 is necessary.];B[pi])

(;W[le]C[White 10 is a mistake.];B[mc];W[mb];B[nb];W[nc];B[md]
C[White is now separated.])

(;W[qb]C[White 10 is not recommended.];B[mc];W[mb];B[ld];W[kc];B[kd];
W[qi];B[jc]
C[If Black plays at top again before White, White barely gets two
eyes.])
)

(;B[pc]C[Black 9 is not recommended.];W[nb];B[nc];W[ob];B[qb];W[rd];
B[rc];W[qd];B[qc];W[le])
)
)

(;W[oe]C[A trick play by White.];B[od];W[me]
C[Black continues with 'a *'. Black 'b' is a mistake.]LB[md:b][ne:a]
(;B[ne]C[Black foils the trick play.];W[nf]
C['A *' is correct, 'B' is a mistake.]LB[md:B][mf:A]
(;B[mf];W[le];B[pf]
C[White continues with 'a'. White 'b' is a mistake.

* GOOD VARIATION *]
LB[pg:b][ng:a]
(;W[ng];B[qe])

(;W[pg]C[White 14 is a mistake.];B[og]C[Neither 'A' nor 'B' work.]
LB[of:B][ng:A]
(;W[ng];B[oh]C[White is in serious trouble.];W[pe];B[of];W[qe];B[qd];
W[qi];B[mh])

(;W[of];B[pe];W[ng];B[oh]C[Neither 'A' nor 'B' work.]LB[ph:B][nh:A]
(;W[nh];B[ph];W[qg];B[ni];W[lg];B[mi];W[lh];B[qh])

(;W[ph];B[oi];W[mg];B[pi];W[qi];B[qj];W[rh];B[ri];W[qh];B[rj]
C[Neither 'A' nor 'B' work.]LB[rd:B][qe:A]
(;W[qe];B[qd];W[rd];B[rc];W[rf];B[sd];W[se])

(;W[rd];B[rf];W[qe];B[rg];W[qg];B[rc])
)
)
)
)

(;B[md];W[ld];B[mf];W[le];B[of];W[ng];B[pf];W[pg])
)

(;B[md]C[Black 9 is a mistake.];W[ld];B[ne];W[nf];B[mf];W[le];B[of];
W[ng];B[pe];W[og])
)

(;W[ie];B[kd]C[Black attacks.];W[ld];B[le];W[ke];B[lf];W[jd];B[kc];
W[jc];B[kb];W[jb]C[Black continues with 'a' or possibly 'b'.]
LB[kf:b][lb:a]
(;B[lb]C[Black captures the two White stones.];W[mc]AB[od]AW[oc]
C[White 18 is unreasonable, even if White has peeped and Black
answered.]
SQ[od]CR[oc];B[mb];W[nc];B[pc];W[pb]
C[Black continues at 'a'. Black 'b' is a costly mistake.]
LB[qb:b][nb:a]
(;B[nb];W[ob];B[qb])

(;B[qb]C[Black loses with 23.];W[nb])
)

(;B[kf];W[lb];B[je];W[ka];B[id];W[ke];B[kd];W[he])
)

(;W[nb]C[White 6 is weak.];B[qc])
)

(;B[qj]AB[pp][pn]AW[nq][jq]
C[Black 5 is ideal with Black support at right as shown, combining
pincer attack with extension.]
;W[rd];B[qc];W[qh]C[White takes root locally.];B[oj]
C[Possible continuation.];W[oh];B[me];W[ic];B[pg];W[ph];B[ri];W[rh];
B[rc])

(;B[me]
C[Black threatens the pressing move at the red dot. White continues
with 'a' or 'b'.]
LB[le:b][ic:a]CR[kd]
(;W[ic];B[qe];W[pf];B[pi])

(;W[le];B[lf];W[ke]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[mf:b][qe:a]
(;B[qe];W[pf];B[pi]
C[If White cuts at 'a', Black plays 'b' and captures the two stones
at right on a large scale.]
LB[nf:b][mf:a])

(;B[mf]C[Black 9 is weak.];W[rd]C[White can now establish himself.])
)
)

(;B[mc]C[Black 5 is cowardice.];W[ld];B[qe];W[pf];B[re]
C[White still has the peep at 'a'. Giving White extensions as shown
is to White's favor.]
LB[oc:a])

(;AB[dd];B[id];W[le];B[kd];W[ld];B[nf];W[pf];B[of];W[nb];B[pb];W[ib];
B[gc])
)

(;W[tt]
C[White plays elsewhere. Black continues with 'a', 'c' or 'd'.
Black 'c' is a mistake.]
LB[pj:d][pf:c][qi:b][qe:a]
(;B[qe];W[pf];B[pi];W[nf];B[ld];W[ni];B[pk]
C[As long as White is under attack, it is difficult to invade at
'a'.]
LB[qc:a])

(;B[qi];W[qk];B[oi];W[qc];B[qd];W[rd];B[re];W[rb];B[sd];W[rc];B[qe];
W[nb])

(;B[pf]C[Black 5 is a mistake, as it strengthens White.];W[pg];B[of];
W[re];B[rd];W[qd];B[qc];W[qe];B[rc];W[qj])

(;B[pj]C['A' is usual, 'B' is possible.]LB[rd:B][qd:A]
(;W[qd];B[qc];W[rc]
C['A' both settle quick and easy.
'B' various outcomes.
'C' both settle.]
LB[rb:C][qe:B][pc:A]
(;B[pc];W[re])

(;B[qe];W[rd]
C['A' gives White the choice.
'B' gives the side and corner for big influence.]
LB[pe:B][re:A]
(;B[re]
C['A' gives the corner for influence.
'B' takes the corner for influence.]
LB[pc:B][pe:A]
(;W[pe];B[rf];W[pf];B[qg];W[pg];B[qh];W[od];B[pc];W[oc];B[ob];W[nc];
B[nb];W[mc];B[rb])

(;W[pc];B[pe];W[oc];B[nc])
)

(;B[pe];W[re];B[pf];W[qg];B[pg])
)

(;B[rb];W[re];B[sc];W[pe];B[od];W[rd];B[pb];W[qh])
)

(;W[rd];B[qc];W[qh])
)
)

(;AW[jc];W[ob]C['A *' is joseki.'B', 'C' and 'D' are inferior.]
LB[qc:D][oc:C][nb:B][pb:A]
(;B[pb]
C[White secures the top and pushes Black into the corner on 'A'
or secures the corner and pushes Black into a small top group
on 'B'.

* GOOD VARIATION *]
LB[qc:B][oc:A]
(;W[oc];B[pc]C['A' is correct, 'B' is no help.]LB[od:B][mc:A]
(;W[mc];B[qe];W[pf];B[od])

(;W[od];B[oe];W[mc];B[qe];W[pf];B[pe]
C[The Black corner is bigger, and the marked stones have less liverties.]
TR[pf][qf])
)

(;W[qc];B[pc];W[qd];B[lc])
)

(;B[nb];W[oc];B[nc];W[qc];B[qd];W[od];B[oe];W[rc];B[rd];W[pc];B[pf];
W[ne])

(;B[oc];W[pb];B[nb];W[mc];B[nc];W[qc];B[qd];W[rd];B[re];W[rb];B[sd];
W[rc];B[qe];W[pf])

(;B[qc];W[mc])
)

(;AW[jc];W[pb]
C['A *' is joseki. 'B' is inferior. 'C' fails to take the corner.
'D' and 'E' leave Black with not much territory.]
LB[qc:E][oc:D][qe:C][nb:B][pc:A]
(;B[pc]C['A *' is correct, 'B' is a mistake.]LB[qb:B][ob:A]
(;W[ob]C['A *' is joseki, 'B' is wrong.]LB[qb:B][mc:A]
(;B[mc]C[
* GOOD VARIATION *];W[qc];B[qd];W[rc];B[rd];W[rb];B[qh])

(;B[qb];W[rd];B[rc];W[qd];B[qc];W[mc])
)

(;W[qb];B[ob];W[rd]
C[The White mistake is punished by the Black cutting tesuji on
'A'.]
LB[rc:A])
)

(;B[nb];W[qd];B[qc];W[pc];B[qb];W[rd];B[oc];W[pe];B[od];W[rb])

(;B[qe];W[pf];B[nb];W[qc];B[re];W[ob];B[nc];W[rb])

(;B[oc];W[rd];B[qc];W[rc];B[qb];W[mc])

(;B[qc];W[mc];B[nb];W[nc];B[ob];W[oc];B[pc];W[od])
)

(;AB[jd];W[ld]
C[Useful for games against 6 or more handicap stones.

'A' or 'B' are ok.]
LB[me:B][ke:A]
(;B[ke];W[le];B[lf]
C['A' White lives for big influence,
'B' prevents being enclosed, but creates a target for attack
strenghening Black on both sides..]
LB[me:B][mf:A]
(;W[mf];B[me];W[lb];B[jb];W[oc];B[od];W[nc];B[pc];W[md];B[ne];W[pb];
B[qb];W[oa];B[kf]
C[White cannot activate his cutting stone because of the weakness
of his top side group.]
;W[rd];B[rc];W[qd];B[qc];W[mg];B[nb];W[mb];B[lc];W[kc];B[kd]
C['A' gives some, 'B' gives all.]LB[mc:B][kb:A]
(;W[kb];B[mc];W[ob];B[jc];W[ka])

(;W[mc];B[kb])
)

(;W[me];B[pf]C['A' is correct, 'B' unnecessarily strenghens Black.]
LB[pg:B][mf:A]
(;W[mf];B[qe])

(;W[pg];B[of];W[mf];B[qg])
)
)

(;B[me];W[le];B[lf]
C['A' White lives for influence.
'B' White prevents being enclosed but gets bad shape and not
yet life.]
LB[ke:B][kf:A]
(;W[kf];B[ke];W[lb];B[jb];W[oc];B[od];W[nc];B[pc];W[md];B[lg];W[pb];
B[qb];W[oa];B[nf]PL[2];B[je]
C[This move threatens a sente 7.5 point gain.];W[dp];B[nb];W[mb];B[lc]
;W[kb];B[kc];W[na];B[mc];W[ob])

(;W[ke])
)
)

(;W[qi];B[qe]C['A' is correct, 'B' is a mistake.]LB[pf:B][re:A]
(;W[re];B[rd];W[ql]C[End of joseki.];B[rf]C[Capturing here is slow.];
W[rg];B[se])

(;W[pf];B[qk];W[oi])
)

(;AB[jc];W[md]
C[If White or nobody has the top left, 'A' is correct.
If White has the top left, Black attacks on 'B'.
'C' is too submissive.]
LB[nc:C][ne:B][mc:A]
(;B[mc];W[lc]
C['A' risks losing the triangled stone.
'B' is therefore necessary, if White has the top left.]
LB[ld:B][nc:A]TR[jc]
(;B[nc];W[ld])

(;B[ld];W[me]C['A' is correct, 'B' is a mistake.]LB[ne:B][le:A]
(;B[le];W[nc];B[mb];W[lf];B[je];W[mf];B[nb])

(;B[ne];W[le];B[kd];W[nc];B[mb];W[oc];B[lb];W[od];B[oe];W[pe];B[og];
W[qd])
)
)

(;B[ne];W[kd];B[jd];W[ke];B[je];W[kf])

(;B[nc])
)

(;W[pi]
C['A' or 'B'.
'C' is a possible handicap continuation for White.]
LB[jd:C][jc:B][qe:A]
(;B[qe]C['A' is better than 'B'.]LB[pf:B][re:A]
(;W[re];B[rd];W[ql];B[rf];W[rg])

(;W[pf];B[qk];W[ri])
)

(;B[jc])

(;B[jd];W[lc]C['A' or 'B'.]LB[jc:B][ld:A]
(;B[ld];W[mc];B[md];W[jc];B[ic];W[kc];B[id];W[pb])

(;B[jc];W[oc];B[od];W[pc];B[nc];W[nb];B[mb];W[ob];B[mc];W[rd])
)
)
)

(;B[nc]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

Black 3 is solid and defensive. White continues with 'a *', 'b
*', 'c *', 'd *', 'e' or 'h'.

'e' is almost joseki and an invention of Kobayashi Koiichi.

'f' is only good as ko threat or in handicap go.

'g' initiates a trick play, if there is an additional Black stone
on the triangled position like in handicap games.

d4, c3, b2, a1
]
LB[pj:h][ld:g][od:f][qi:e][lc:d][qd:c][qc:b][rd:a]TR[jd]
(;W[rd]C[Black continues with 'a *', 'b *' or 'c'.]
LB[qg:c][qh:b][qc:a]
(;B[qc]
C[White continues with 'a *' or 'b'. White 'c' and 'd' are given
to illustrate Black responses.
With an additional White stone on the triangled position, White
can also play 'e'.]
PL[2]LB[qm:e][rc:d][lc:c][pe:b][qi:a]TR[pp]
(;W[qi]
C['A' shows continuations for White,
Later, Black can play 'B', especially with an additional stone
on the triangled position.]
LB[qg:B][dp:A]TR[qk]
(;B[dp]C[Black plays elsewhere.

White can attack on 'A *' or 'B'.]
LB[rc:B][lc:A]
(;W[lc]
C[Black on 'A' is a good answer. 'B *' covers, what happens, if
Black plays tenuki.]
LB[dp:B][rc:A]
(;B[rc]C[Black 9 is necessary.])

(;B[tt];W[rc]
C[Black 'A' and 'B' are easy and recommended even if Black has
the ladder,
'C *' possible, if Black has the ladder.]
LB[rb:C][nf:B][mc:A]
(;B[mc]C[Black forestalls a White invasion.];W[ld];B[rb])

(;B[nf]PL[2];B[pf]C[Later.])

(;B[rb];W[pb]
C[White made the most famous hoshi trick play.
'A *' is correct, Black needs the ladder,
'B' is getting tricked.
'C' doesn't work.]
LB[re:C][qb:B][ob:A]
(;B[ob];W[qb];B[ra]
C[
* GOOD VARIATION *

White cannot gain a good result on 'A' if Black has the ladder.
'B' doesn't work.]
LB[sb:B][pc:A]
(;W[pc];B[qd];W[od];B[pe]
C[If White does not have the ladder, he plays a disadvantageous
furikawari on 'A'.
If he has the ladder, he destroys Black on 'B'.]
LB[oe:B][oc:A]
(;W[oc]C['A' is correct. Capturing immediately on 'B' is inferior.]
LB[re:B][oe:A]
(;B[oe]C['A' gives less than 'B'.]LB[qe:B][nd:A]
(;W[nd];B[re])

(;W[qe];B[nd];W[nb];B[pa];W[oa];B[qa];W[ob];B[mb])
)

(;B[re];W[of])
)

(;W[oe];B[pf];W[qe]
C['A' keeps the corner with the ladder.
'B' loses the corner.]
LB[pg:B][oc:A]
(;B[oc];W[pg])

(;B[pg];W[oc])
)
)

(;W[sb];B[pc])
)

(;B[qb]C[White connects on 'A' or 'B'.]LB[nb:B][oc:A]
(;W[oc];B[od];W[nb]C[Black has nothing.])

(;W[nb];B[mb]C['A' is correct, 'B' is a mistake.]LB[mc:B][oc:A]
(;W[oc])

(;W[mc];B[ob];W[oc];B[na];W[nd];B[nb])
)
)

(;B[re];W[qe];B[qd];W[rf];B[ob];W[qb];B[pc];W[ra];B[sb];W[qa];B[oa];
W[se];B[pa];W[sc];B[sa];W[qb])
)
)
)

(;W[rc];B[kc])
)

(;AB[qk];B[qg]C['A' is correct, 'B' and 'C' are disadvantageous.]
LB[pg:C][rg:B][qh:A]
(;W[qh]C['A' is correct, 'B' is questionable.]LB[rf:B][qe:A]
(;B[qe];W[re];B[pf];W[rf]C[Later, Black A, B, C are sente.]
LB[oh:C][og:B][pg:A])

(;B[rf];W[re];B[pf];W[qe]C[Black cannot cut neither on 'A' nor 'B'.]
LB[pg:B][rg:A]
(;B[rg];W[pg])

(;B[pg];W[rg])
)
)

(;W[rg];B[rf]C['A' or 'B'.]LB[re:B][pg:A]
(;W[pg];B[qe];W[qh];B[re])

(;W[re];B[rh];W[qh];B[sg];W[pg];B[ri];W[rg]
C[This Ko is bad for White.])
)

(;W[pg];B[rf];W[qe];B[qh];W[ph];B[ri];W[rh];B[rg];W[rj];B[sh];W[qj];
B[pi];W[sf]C[White cannot kill.];B[re];W[se];B[qd];W[pf];B[rc])
)
)

(;W[pe]C[Black continues with 'a' or 'b'.]LB[qd:b][od:a]
(;B[od]
C[Black 7 is a bit submissive, but the outcome is roughly equal.];
W[rc];B[rb];W[qd];B[pb];W[qi])

(;B[qd];W[rc];B[rb];W[od];B[oc];W[qe];B[pb];W[qj]
C[The extension of White 14 is necessary.])
)

(;W[lc]
C[White 6 is not joseki, but may make strategic sense. Black continues
with 'a'; Black cannot afford to play elsewhere ('b').]
LB[dp:b][rc:a]
(;B[rc]
C[Black 7 may seem submissive, but is necessary to live in the
corner.])

(;B[tt]C[Black plays elsewhere, a mistake.];W[rc]
C[Black continues with 'a' or 'b'.]LB[mc:b][rb:a]
(;B[rb];W[pb]
C[The obvious move is Black 'a'. Black 'b' looks like a tesuji,
but the result is not good for Black.]
LB[ob:b][qb:a]
(;B[qb];W[oc];B[od];W[nb]
C[Black has had his corner hollowed out, and must flee to the center.])

(;B[ob];W[qb];B[ra];W[pc];B[qd];W[od];B[pe]
C[White continues with 'a', or, having a favorable ladder to the
lower left corner (forget Black 7), White may play 'b'.]
LB[oe:b][oc:a]
(;W[oc];B[re];W[of])

(;W[oe]
C[White must have the ladder to the lower left corner to play this
way.]
;B[pf];W[qe]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[pg:b][oc:a]
(;B[oc];W[pg])

(;B[pg]C[Black 21 is untenable.];W[oc]C[Black's position is terrible.])
)
)
)

(;B[mc];W[ld];B[rb]C[White 'a' is still sente.]LB[lb:a])
)
)

(;W[rc]C[White 6 is not joseki.];B[kc]
C[Black must extend to ensure life.])

(;AW[pp];W[qm];B[qh]
C['A' is correct.
'B' and 'C' are disadvantageous.]
LB[rc:C][of:B][pe:A]
(;W[pe]C['A' is correct.
'B' and 'C' are disadvantageous.]
LB[oe:C][qd:B][qk:A]
(;B[qk];W[od];B[oc];W[qd];B[pc];W[nf])

(;B[qd];W[rc];B[rb];W[od];B[oc];W[qe];B[qb];W[qj];B[oh];W[nf])

(;B[oe];W[of];B[ne];W[qd];B[pc];W[qj])
)

(;W[of];B[oh];W[mf];B[qk])

(;W[rc];B[pf])
)
)

(;B[qh]
C[Black 5 is a powerful move, and works well with Black 3. 'A *'
is correct, 'B' is wrong.]
LB[of:B][qc:A]
(;W[qc]
C[Black continues with 'a *'. Black 'b' is weak. 'c' avoids a cutting
stone.]
LB[pf:c][pc:b][qe:a]
(;B[qe]
C[White continues with 'a *' or 'b'. 

White 'a' is tough-minded, giving White an equal result (a White
corner and access to the outside). 

White 'b' gives Black a slightly favorable result (Black thickness
versus a small White corner).]
LB[pe:b][re:a]
(;W[re];B[pf]C['A' or 'B *', depensing on the overall position.]
LB[rf:B][pg:A]
(;W[pg]
C[Black 'A' is usual. If 'B' leads to a good result considering
the surrounding positions, than White 10 is wrong.]
LB[pg:10][rf:B][qg:A]
(;B[qg];W[rf];B[of])

(;B[rf];W[qg];B[rg];W[ph];B[qi])
)

(;W[rf];B[pg]C[
* GOOD VARIATION *])
)

(;W[pe];B[pf];W[oe]C[Black continues with 'a' or 'b'.]LB[qd:b][rf:a]
(;B[rf];W[qd];B[qg]
C[White continues with 'a'. White 'b' is a mistake.]LB[od:b][oc:a]
(;W[oc];B[nd];W[od];B[ob]C['A' or 'B'.]LB[ne:B][pb:A]
(;W[pb];B[nf]C[End of joseki];W[ne]C[Later];B[me];W[md];B[of];W[pc];
B[le];W[mc])

(;W[ne];B[pb]C['A' is correct, trying to surround Black on 'B' fails.]
LB[mb:B][pc:A]
(;W[pc];B[ld];W[qb])

(;W[mb];B[nb]
(;W[ld];B[pc]
(;W[mc];B[md];W[me];B[lc];W[lb];B[kc];W[kb];B[jc];W[jb];B[ic]
(;W[qb];B[le];W[kd];B[ke];W[jd];B[ie])

(;W[le];B[qb];W[rb];B[ra];W[sb];B[re];W[sc];B[se];W[sd];B[qa];W[na];
B[sa])
)

(;W[lc];B[qb];W[rb];B[ra];W[sb];B[re];W[sc];B[se];W[sd];B[qa])
)

(;W[pc];B[ld])
)
)
)

(;W[od];B[oc]C[White loses his eye shape.])
)

(;B[qd]C[White continues with 'a'. White 'b' is a mistake.]
LB[od:b][re:a]
(;W[re]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[rf:b][pc:a]
(;B[pc];W[qg]C[Black continues with 'a' or 'b'.]LB[rc:b][pg:a]
(;B[pg];W[ph];B[nf];W[pi];B[ng];W[rh])

(;B[rc];W[ph]C[Black later aims to play 'a'.]LB[of:a])
)

(;B[rf]C[Black 13 is a mistake, an act of impatience.];W[oc];B[od];
W[nd];B[qg];W[pc];B[qf];W[mc];B[ne];W[md]
C[White gets considerable profit, while Black position is somewhat
unresolved, as White's two stones still have aji.])
)

(;W[od]C[White 12 is a mistake.];B[pc];W[oc];B[pb];W[pg];B[rf];W[of];
B[re]
C[Black can play 'a' to connect to Black 3 because 3 was the knight's
move, not the one-space jump. White having to add a stone at
'a' to complete his thickness is painful. The result is a Black
success.]
LB[ob:a])
)
)
)

(;B[pc]
C[Black 7 is a mistake.

White continues with 'a'. White 'b' is an overplay, leaving White
subject to being cut in two.]
LB[of:b][pf:a]
(;W[pf]
C[White 8 is the best way to avoid being sealed in. White 8 may
seem slow, but other moves leave weaknesses for Black to exploit.])

(;W[of];B[qd];W[rc];B[pf];W[pg];B[rf])
)

(;B[pf]
C['A' is correct. All other moves are mistakes doing nothing than
unneccesarily strengthen Black more than 'A' does..]
LB[qe:A];W[qe];B[pg])
)

(;W[of];B[qc])
)

(;B[qg]
C[Black 5 is a Korean innovation. 

White continues with 'a' or, with the ladder, 'b'.
As 'b' gets Black a ladder breaker it's disadvantageous.]
LB[rg:b][pg:a]
(;W[pg]
C[White 6 is the only feasible continuation.
'A' is correct, 'B' and 'C' are not recommended.
]
LB[qh:A][qe:B][pf:C]
(;B[qh]
C['A' is correct, 'B', 'C' and 'D' are other variations which might
be inferior (or simply older).
]
LB[pe:D][rf:C][pf:B][ph:A]
(;W[ph]C['A' is correct, 'B' is a mistake.]LB[qi:B][rf:A]
(;B[rf]C['A' is correct, 'B' is a mistake.]LB[re:B][qe:A]
(;W[qe]C['A' or 'B'.]LB[qi:B][qj:A]
(;B[qj];W[pi]
C['A' is usual, 'B' is good if White is in the lower right corner..]
LB[rk:B][qk:A]
(;B[qk];W[qc]C['A' is better than 'B'.
'C' is a mistake.]
LB[re:C][pc:B][kc:A]
(;B[kc])

(;B[pc];W[re];B[kc])

(;B[re];W[qd]C[Black 1 is now damaged for nothing.]LB[pd:1])
)

(;B[rk];W[qc];B[re];W[qd];B[pc]
C[The sequence ends.

Black currently has one eye in the corner. Playing White 'a'
gives White two eyes in the corner, but the move is desparately
small. If White is trying to make two eyes in the corner, White
'b' leads to a ko. 

Locally, White 'c' covers the cut at the red dot, but may not
be the best strategic play.]
LB[ne:c][pb:b][rb:a]CR[pf]
(;W[rb]
C[White to live in the corner. This should not be played immediately:
White should be able to make eyes in the center]
;B[pb];W[sc])

(;W[pb];B[ob];W[rb];B[pa];W[qa])

(;W[ne])
)
)

(;B[qi];W[qc];B[pc];W[re];B[pi])
)

(;W[re];B[pf];W[qe];B[pi])
)

(;B[qi]C['A' is correct, 'B' is questionable.]LB[qc:B][pe:A]
(;W[pe];B[qc];W[od];B[oc];W[qd];B[pc];W[pk])

(;W[qc]
C[White opts for the corner, leaving the two White stones in peril.];
B[pf];W[rf];B[of]
C[The thinking behind this variation, first exchanging White 6
for Black 7 before switching to the corner, is that Black cannot
immediately catch the White stones in a ladder at 'a'. Nonetheless,
White cannot immediately pull out the two stones.]
LB[og:a])
)
)

(;W[pf];B[qc]
C[White can continue with 'a' as an attack on the two Black side
stones. White 'a' works well with a White presence at the bottom
right.]
LB[pj:a];W[pj]
C[Black is satisfied to have played in the corner and on the side.

Black 'a' is sente, though it solidifies White's thickness.

If later he can play at 'a', 1 is ideally placed. White can attack
with 10, which works particularly well if he has thickness at
the bottom, but Black doesn't necessarily need to fear that fight,
since 'a' is sente.]
LB[rf:a];B[rf];W[re];B[sg];W[pe]C[Black may continue with 'a' to 'c'.]
LB[qj:c][rj:b][pi:a];B[pi];W[oi];B[qj];W[pk];B[rl])

(;W[rf]
C[Black continues with 'a' to emphasize the right side, or 'b'
to take the corner.]
LB[qc:b][ph:a]
(;B[ph]
C[White can now defend the cutting point with 'a' or take the corner
with 'b'. White 'a' gives Black a chance to build thickness toward
the bottom right.]
LB[qc:b][of:a]
(;W[of];B[qc];W[oh];B[oi];W[nh];B[ni]
C[Because he’s already safe in the corner, Black can continue to
build influence.])

(;W[qc];B[nh]C[Black keeps 'a' and 'b' in reserve.]LB[pf:b][og:a])
)

(;B[qc]C[Black can also immediately take the corner.];W[ph];B[qi];
W[pe]C[Black ends in sente.]LB[qd:b][dp:a];B[dp]
C[Black plays elsewhere.];W[od]
C[White forces. This play should be made fairly early.];B[oc];W[qd];
B[pc])
)

(;W[pe]C[Black continues with 'a' or 'b'.]LB[qd:b][qc:a]
(;B[qc];W[od];B[oc];W[qd];B[pc]
C[The difference of this sequence and White playing at 'a' and
Black at 9, is that White can immediately play the forcing sequence
from 10 to 13.]
LB[rf:a])

(;B[qd];W[rc]
C[White 10 is feasible. 

Black continues with 'a'. Black 'b' is a mistake.]
LB[rf:b][oe:a]
(;B[oe];W[qe];B[of];W[pc];B[od];W[ob]
C[The result is a roughly equal trade-off of Black thickness for
White territory.])

(;B[rf];W[re];B[qe];W[pf];B[rg];W[od]
C[White captures the three Black stones. If Black 'a', White 'b'.]
LB[pb:b][qb:a];B[qb];W[pb])
)
)
)

(;B[qe];W[re];B[pf];W[rf];B[qh];W[ph];B[qi];W[of];B[pe];W[qc]
C[Black has two weak groups.
])

(;B[pf]LB[qe:A][qh:B]
C[Whtie punishes on 'A' and fails to do so on 'B'.
]
(;W[qe]LB[qh:A][pe:B]C['A' or 'B' don't help.
]
(;B[qh];W[pe];B[of];W[oe])

(;B[pe];W[qh])
)

(;W[qh];B[qe];W[rg];B[re])
)
)

(;W[rg]C[Black 6 depends on the ladder.
'A' or 'B'.]LB[qe:B][rf:A]
(;B[rf]
C[White must have the ladder to play 'a'.

White 'b' and 'c' leave White in a low position.]
LB[re:c][qh:b][pg:a]
(;W[pg];B[qh];W[rh];B[qe];W[pf];B[re];W[qi]
C[White can live in the corner by playing 'a'.]LB[qc:a];B[pp]
C[Black plays elsewhere (not breaking the ladder).];W[qc]
C[This shows that White can live in the corner after Black 'A',
'B' or 'C'.]
LB[pb:C][pc:B][ob:A]
(;B[ob]C['A' or 'B' are correct, 'C' fails.]LB[pb:C][rb:B][pc:A]
(;W[pc]C['A', 'B' or 'C' don't kill.]LB[qa:C][oc:B][od:A]
(;B[od];W[rb];B[sc]C['A' lives, 'B' and 'C' fail.]LB[sd:C][sb:B][pb:A]
(;W[pb];B[qa];W[sb]C[Neither 'A' nor 'B' kill.]LB[pa:B][sd:A]
(;B[sd];W[oc]C['A' leads to a small, 'B' to a big loss.]LB[nb:B][nd:A]
(;B[nd];W[pa];B[ra];W[nb])

(;B[nb];W[pa];B[ra];W[nd]C[Black 'A', 'B' or 'C' fail.]
LB[oe:C][lc:B][ne:A]
(;B[ne];W[md];B[lb];W[oe];B[of];W[pe];B[ph];W[qd];B[ri];W[sf])

(;B[lc];W[ne])

(;B[oe];W[md];B[lc];W[nf];B[ne];W[me];B[of];W[ng];B[og];W[oh])
)
)

(;B[pa];W[sd];B[ra];W[oc];B[nb];W[nd];B[ne];W[md];B[oe];W[lc];B[lb];
W[kb]C[Neither 'A' nor 'B' work.]LB[kc:B][mb:A]
(;B[mb];W[kc];B[qb];W[oa];B[na];W[la];B[qd];W[rc];B[se];W[mc])

(;B[kc];W[kd];B[jc];W[mf];B[og];W[of];B[nf];W[ng];B[ph];W[oh];B[qb];
W[me];B[qd];W[rc];B[oa];W[sf];B[se];W[pe])
)
)

(;W[sb];B[pb];W[sd];B[ra];W[qa];B[qb];W[oc];B[nd])

(;W[sd];B[pb];W[qb];B[qa];W[ra];B[sb];W[oc];B[nd])
)

(;B[oc];W[sd]C['A' or 'B' don't kill.]LB[od:B][rb:A]
(;B[rb];W[se];B[sf];W[pe];B[qd];W[od])

(;B[od];W[rb]LB[sc:B][pb:A]
(;B[pb];W[sc])

(;B[sc];W[pb])
)
)

(;B[qa];W[od]LB[oe:B][pe:A]
(;B[pe];W[oe];B[oc];W[qd])

(;B[oe];W[pe];B[qd];W[se])
)
)

(;W[rb]C[Neither 'A' nor 'B' kill.]LB[qa:B][sc:A]
(;B[sc];W[sd];B[qa];W[pc];B[oc];W[pe];B[qd];W[od])

(;B[qa];W[pc]C[Neither 'A' nor 'B' work.]LB[od:B][oc:A]
(;B[oc];W[pe];B[qd];W[od];B[sd];W[rc];B[ra];W[sf])

(;B[od];W[oc]C[Neither 'A' nor 'B' work.]LB[nb:B][nd:A]
(;B[nd];W[pb];B[nb];W[pa])

(;B[nb];W[nd];B[oe];W[ra];B[sc];W[sd];B[sb];W[md]
C[Neither 'A' nor 'B' nor work.]LB[nf:B][lc:A]
(;B[lc];W[nf])

(;B[nf];W[lc];B[lb];W[kb];B[mb];W[kc];B[se];W[qd];B[pe];W[pb];B[pa];
W[oa];B[na];W[la])
)
)
)
)

(;W[pb];B[rb])
)

(;B[pc]C[White lives with 'A' and dies with 'B'.]LB[pb:B][rb:A]
(;W[rb]
C['A' is correct. 'B' attempts to kill but fails and just loses
some points on the top.]
LB[sc:B][pb:A]
(;B[pb]
C['A' is correct and gives life, 'B' is wrong and gives only a
ko.]
LB[sc:B][qd:A]
(;W[qd];B[qb];W[sd];B[ra];W[pe];B[sb])

(;W[sc];B[qb];W[qd];B[ra];W[pe];B[sb];W[sa])
)

(;B[sc];W[pb]C['A' or 'B' don't kill.]LB[sd:B][ob:A]
(;B[ob]C['A' or 'B' are ok.]LB[qd:B][qa:A]
(;W[qa]C['A' or 'B' don't kill.]LB[sb:B][sd:A]
(;B[sd];W[sb])

(;B[sb];W[sd])
)

(;W[qd]C['A' is correct. 'B' loses stones.]LB[pa:B][pe:A]
(;B[pe];W[qa];B[sd];W[sb])

(;B[pa]
C['A' is correct. 'B' is possible with good ko threats. 'C' is
a mistake.]
LB[qb:C][qa:B][pe:A]
(;W[pe]C['A' or 'B' don't kill.]LB[sd:B][qb:A]
(;B[qb];W[se];B[ra];W[sb])

(;B[sd];W[sf];B[se];W[sb];B[sg];W[rc])
)

(;W[qa];B[qb];W[pe];B[sd];W[pb])

(;W[qb];B[pe];W[sd];B[sb]C['A' or 'B' don't help to live.]
LB[sa:B][qa:A]
(;W[qa];B[sa])

(;W[sa];B[qa])
)
)
)
)

(;B[sd]C[White lives or moves out on 'A' or lives on 'B'.]
LB[sb:B][ob:A]
(;W[ob]C['A' or 'B' don't kill.]LB[sb:B][nb:A]
(;B[nb];W[sb];B[qa];W[ra];B[oa];W[qb])

(;B[sb];W[nb])
)

(;W[sb];B[ob];W[qa])
)
)
)

(;W[pb];B[rb];W[qb];B[ob];W[qd];B[pe];W[ra];B[sb]
(;W[pa];B[sd];W[sc];B[rc])

(;W[sc];B[pa])
)
)

(;B[pb];W[pc];B[oc];W[qb];B[ob];W[sd];B[rb];W[se]
(;B[sf];W[pe];B[qd];W[od];B[rc];W[sg])

(;B[qd];W[rc];B[sf];W[sb])
)
)

(;W[qh];B[pg];W[re];B[pf];W[sf]
C[This sente sequence is good enough for Black.])

(;W[re];B[pf];W[sf];B[qh];W[qc])
)

(;B[qe];W[qh];B[re];W[rf];B[rc])
)
)
)

(;W[qc]
C[White may play this way when Black has a pincer at 'a'. Otherwise,
White would not prefer to crawl into such a small space.]
LB[qj:a];B[qd]C['A' is correct. 'B' is questionable,]LB[pc:B][rd:A]
(;W[rd]C['A *' to separate White, or 'B'.]LB[pc:B][re:A]
(;B[re];W[rc];B[qe]C['A *' or 'B'.]LB[pc:B][ob:A]
(;W[ob]
C[Black continues with 'a *', possibly 'b' if White has support
at top.]
LB[oc:b][nb:a]
(;B[nb];W[oc];B[od]
C[White continues with 'a *', or dies ('b', playing elsewhere).
White can only cut at 'c' with support at top to quickly capture
the two black stones.]
LB[nd:c][dp:b][pc:a]
(;W[pc];B[me]C[
* GOOD VARIATION *])

(;W[tt]
C[White plays elsewhere, a fatal mistake. Black continues with
'a'. Black 'b' and 'c' are mistakes.]
LB[pc:c][pb:b][oa:a]
(;B[oa]C[Neither White 'a' nor 'b' work.]LB[pb:b][qa:a]
(;W[qa];B[sd];W[sb];B[ra];W[rb];B[pb])

(;W[pb];B[sd];W[rb];B[qa])
)

(;B[pb]C[Black 14 is a mistake.];W[pc];B[oa];W[qb];B[pa];W[qa];B[na];
W[sb]C['a' and 'b' are miai.]LB[sd:b][ra:a])

(;B[pc]C[Black 14 is a mistake.];W[pb]
C[Black may try 'a' or 'b'. Neither work.]LB[sb:b][ra:a]
(;B[ra];W[qa];B[rb];W[sb]C['a' and 'b' are miai.]LB[sd:b][oa:a])

(;B[sb];W[rb])
)
)

(;W[nd];B[lc];W[ne];B[pf];W[pc])
)

(;B[oc]AW[jc]C[Black 11 makes sense if White has a stone as shown.];
W[nb]C[Black continues with 'a' or 'b'. 'c' can be possible.]
LB[mb:c][pf:b][mc:a]
(;B[mc])

(;B[pf]AB[qj]C[Black 13 works well with support at right as shown.];
W[mc];B[md];W[lc];B[oj]C[Black has a great position.])

(;B[mb];W[pc];B[mc];W[pf])
)
)

(;W[pc];B[oc];W[rf]C['A' is correct, 'B' is wrong.]LB[sf:B][se:A]
(;B[se];W[pf]
C['A' is correct, 'B' takes the corner for too much influence.]
LB[pb:B][oe:A]
(;B[oe];W[pb];B[ng];W[pj])

(;B[pb];W[od];B[oe];W[nd];B[pe];W[md];B[qb];W[nf])
)

(;B[sf];W[sd];B[se];W[rh])
)
)

(;B[pc];W[rb];B[qb];W[rc])
)

(;W[pc]C['A' gives White the L+2 shape.
'B' is risky leaving a cut.]
LB[rc:B][oc:A]
(;B[oc];W[rd];B[re];W[rc];B[qe])

(;B[rc];W[rb];B[rd]C['A' is correct, 'B' is disadvantageous.]
LB[oc:B][nb:A]
(;W[nb]C['A' or 'B'.]LB[mb:B][mc:A]
(;B[mc];W[mb];B[lc])

(;B[mb];W[ob];B[mc]C[The cut of A remains.]LB[od:A])
)

(;W[oc];B[od];W[nb];B[mb])
)
)
)

(;W[qd];B[qc];W[rc]
C[Black continues with 'a *' or 'b'. 'c' is inferior.]
LB[pc:c][qe:b][rb:a]
(;B[rb]
C['A *' is joseki, 'B' and 'C' are other variations, 'D' is a furikawari
giving Black more territory.]
LB[pc:D][pe:C][rd:B][re:A]
(;W[re];B[sc]C['A *' is joseki, 'B' is a mistake.]LB[pe:B][rd:A]
(;W[rd];B[pc];W[pe]C[
* GOOD VARIATION *])

(;W[pe];B[rd];W[od];B[pc])
)

(;W[rd];B[pc];W[pe])

(;W[pe];B[od];W[re];B[sc]
C[White answers on A to solidify or B to play the ko.]LB[sd:B][rd:A])

(;W[pc];B[qb];W[od];B[pe];W[oc];B[qe];W[nd])
)

(;B[qe];W[rd];B[re];W[pe];B[rf]C['A' is correct, 'B' is a mistake.]
LB[pf:B][pc:A]
(;W[pc];B[od];W[pb];B[og]C[End of joseki.];W[pf]C[This move is bad.];
B[rg]
C['A' gives Black magnificient thickness, 'B' is a total failure.]
LB[ne:B][qh:A]
(;W[qh];B[qg];W[pg];B[ph];W[oh];B[pi];W[of];B[ng];W[nf];B[mf];W[mg];
B[nh];W[me];B[lf];W[ne];B[le];W[md];B[lc];W[ld];B[kd];W[mc];B[lb];
W[nb];B[mh])

(;W[ne];B[oe];W[of];B[nf];W[ng];B[mf];W[pg];B[oh];W[ph];B[pi];W[oi];
B[nh];W[qi];B[pj];W[qh];B[qj])
)

(;W[pf];B[rg];W[pc];B[od];W[pb];B[og]
C[With the marked stones, White has made a bad exchange and wasted
ko-threats and endgame-moves.]
TR[rg][pf])
)

(;B[pc];W[re])
)

(;W[lc]
C[Depending upon circumstances, Black continues with 'a *' or 'b'.]
LB[qe:b][rd:a]
(;B[rd];W[re]C[
* GOOD VARIATION *

'A' or 'B'.]LB[qe:B][qd:A]
(;B[qd])

(;B[qe];W[rf]C[Later, White can continue on 'A' or 'B'.]PL[2]
LB[sd:B][rc:A]
(;W[rc]C['A' is right, 'B' is wrong.]LB[sd:B][qc:A]
(;B[qc];W[sd])

(;B[sd];W[qc];B[qd];W[ob])
)

(;W[sd]C['A' is right, 'B' is wrong.]LB[sc:B][rc:A]
(;B[rc])

(;B[sc];W[rc];B[se];W[qc];B[qd];W[sb];B[sd];W[ra];B[qb]
C[This move is wrong, as Black cannot kill.];W[pb];B[pc];W[rb];B[pa];
W[ob])
)
)
)

(;B[qe]AW[qi]
C[Black 5 is effective if White has an extension as shown.];W[pf];
B[ne];W[re];B[rd];W[rf]C[The joseki concludes.];B[tt]
C[Black plays elsewhere. 

White continues with 'a'. White 'b' is mischief-making of a high
order.]
LB[rc:b][sd:a]
(;W[sd]
C[In yose (toward the endgame).

Black continues with 'a'. Black 'b' leave aji.]
LB[sc:b][rc:a]
(;B[rc];W[sc];B[sb];W[se]C[Black plays at 'a' or 'b'.]LB[rb:b][qb:a];
B[qb])

(;B[sc]C[Black 12 is a mistake.];W[rc];B[se];W[qc];B[qd]
C[White has considerable opportunity.])
)

(;W[rc]
C[White 12 is risky business. White should not be able to succeed.];
B[sd];W[qc];B[qd];W[ob];B[nb];W[oc];B[od]
C[White may try 'a' or 'b'. Neither should work.]LB[pc:b][ra:a]
(;W[ra];B[sb];W[sc];B[oa]
C[White cannot live.
After Black 7, White cannot live inside the corner, so White
12 is wrong.]
LB[rc:12][ne:7])

(;W[pc];B[pa];W[oa];B[sc];W[sb];B[rb];W[ra];B[qb])
)
)
)

(;W[qi];B[qe];W[re];B[rd];W[ql])

(;W[od]
C['A' is good for Black, 'B' is too submissive.
'C' is not recommended.]
LB[pe:C][oc:B][oe:A]
(;B[oe]C['A' or 'B' give Black a good result.]LB[pe:B][qd:A]
(;W[qd];B[qe];W[re];B[pe];W[qc];B[rd];W[rf];B[rc];W[qb];B[rb];W[ob];
B[oc];W[pb];B[nb];W[ra];B[qa];W[pa];B[sb];W[sd]
C[White captures the corner.];B[ph];W[rh])

(;W[pe];B[qd])
)

(;B[oc];W[qd]C['A' or 'B'.]LB[qc:B][pe:A]
(;B[pe];W[qe];B[qc];W[rc];B[pf];W[qb];B[pc];W[qg])

(;B[qc];W[pe];B[pc])
)

(;B[pe];W[oc])
)

(;AB[jd];W[ld]C['A' or 'B'.]LB[lc:B][qe:A]
(;B[qe];W[pf];B[ne])

(;B[lc];W[oc]C['A' or 'B'.]LB[od:B][md:A]
(;B[md];W[od];B[pe]C['A' or 'B'.]LB[nb:B][me:A]
(;W[me];B[pf])

(;W[nb];B[pf];W[qc];B[qg])
)

(;B[od];W[kc]C['A' or 'B'.]LB[kd:B][mc:A]
(;B[mc];W[kd];B[qd])

(;B[kd];W[mc]C['A' is correct, 'B' is getting tricked..]LB[lb:B][md:A]
(;B[md];W[lb];B[le];W[nb];B[nd]C['A' or 'B'.]LB[pc:B][lc:A]
(;W[lc];B[ob];W[pc];B[na];W[mb];B[qc];W[pb];B[qb];W[oa];B[qi])

(;W[pc];B[lc];W[mb];B[qc];W[qb];B[qd])
)

(;B[lb];W[nd];B[nb];W[mb];B[ma];W[md]C['A' or 'B' don't help.]
LB[kb:B][ob:A]
(;B[ob];W[kb];B[la];W[na];B[oa];W[pc];B[pb];W[qc];B[qb];W[qd];B[jc];
W[oe])

(;B[kb];W[ob];B[na];W[jc];B[jb];W[ic];B[ib];W[hc];B[pc];W[hb];B[pb];
W[mf])
)
)
)
)
)

(;W[pj];B[rd]C[Later]PL[2];B[rf]C[Later];W[qe];B[re];W[rg]C[Later]
PL[2];W[qd];B[qc];W[pc]C[Asking move];B[pb];W[rc];B[qb];W[sd];B[rb];
W[sb]C[Ko])
)

(;B[mc]
C[
Oogeima = Nunmokcha = Da` Fei = Large Knight's Move
----------------------------------------------------

White continues with 'a *', 'b *', 'c *', 'd *', 'e *' to 'g *' or 'j'. White 'd', the nose contact play, is a trick play.

Black 3 is the most complicated answer to the White approach.
To avoid all variations, players who don't know them treat the
position as if Black had played the keima instead and continue
on 'h'. This involves only a minor loss of territorial balance
for sake of simplicity.

'i' is a mistake.

d4, c3, b2, a1
]
LB[od:i][rd:h][pc:g][rc:f][ob:e][lc:d][kc:c][qd:b][qc:a][pj:j]
(;W[qc]
C[Black 3 attempts to take the corner area. White attempts to prevent
that with 4.

Black continues with 'a *'. Black 'b' is not recommended.]
LB[pc:b][qd:a]
(;B[qd]C[White continues with 'a *' or 'b *'.]LB[rd:b][pc:a]
(;W[pc]
C[Black continues with 'a *'. Black 'b' is not recommended.
'c' starts a fight.
'd' is bad.]
LB[rd:d][rc:c][oc:b][od:a]
(;B[od]
C['A *' gives Black the choice, 'B *' the top side.
White 'C *' takes the corner.
'D' was once joseki, but is now seen as disadvantageous.
]
LB[nb:B][oc:A][ob:C][rd:D]
(;W[oc]
C[Black continues with 'a *' for the right side or 'b' for the
top side.
'c' is unfavorable.]
LB[rc:c][nc:b][rd:a]
(;B[rd]C[
White continues with 'a *' or 'b'.]LB[mb:b][nc:a]
(;W[nc]C['A *' is joseki. 'B' is questionable.]LB[md:B][nd:A]
(;B[nd]C['A *' is correct, 'B' is disadvantageous.]LB[md:B][mb:A]
(;W[mb];B[lc];W[lb];B[kc]
C[
White continues with 'A *'. White 'B' and all other extensions
on the right side are disadavantageous.]
LB[qi:B][kb:A]
(;W[kb]
C[
* GOOD VARIATION *

'A' is correct, 'B', 'C' and 'D' are not recommended.]
LB[jc:D][pj:C][qj:B][pi:A]
(;B[pi];W[qk];B[ok];W[qi];B[ph];W[qh];B[pg];W[pm];B[jc])

(;B[qj]C['A' is correct, 'B' helps Black.]LB[jc:B][pi:A]
(;W[pi];B[pj];W[oi];B[rh];W[of])

(;W[jc];B[le])
)

(;B[pj];W[oi];B[pi];W[og])

(;B[jc];W[pj])
)

(;W[qi]
C[The result is not unfavorable for Black so much as a wasted opportunity.]
;B[kb];W[rc];B[qk]
C[Having no secure base, the White group is now a target for attack.])
)

(;W[md]C[White 12 provokes an unfavorable fight.];B[mb];W[rc];B[kc];
W[me];B[of];W[ke];B[jd]
(;W[nb]C[White must play 20 to live in the corner.])

(;W[ph]
C[Any move other than preserving life in the corner is a mistake.
White 20 is exemplary. White must play in the corner to preserve
life, or the game is forfeit.]
;B[oa];W[pa];B[na];W[ob];B[qb];W[rb];B[sc];W[sb];B[ra]C[White dies.])
)
)

(;B[md]C[White continues with 'a'. White 'b' is a mistake.]
LB[rc:b][nd:a]
(;W[nd];B[ne]
C[White continues with 'a'. White 'b' and 'c' are not recommended.]
LB[me:c][oe:b][rc:a]
(;W[rc]
C[Black continues with 'a' or 'b'. Black sacrifices four stones
with 'b'. Black 'b' is suitable for a handicap game, where Black
tries to avoid complications.]
LB[me:b][of:a]
(;B[of]C['A' or 'B'.]LB[me:B][qi:A]
(;W[qi];B[lf])

(;W[me];B[kd];W[mf];B[pg];W[qh];B[pi]C[Black 'a' is sente.]LB[mb:a];
W[qi];B[pj])
)

(;B[me];W[oe];B[of];W[pe];B[pf];W[qe];B[qg];W[re];B[rf];W[sd];B[ph])
)

(;W[oe]C[White 14 is not recommended.];B[rc];W[rb];B[of];W[pe];B[qb];
W[pb];B[pf];W[qe];B[qg];W[nf];B[me];W[pg];B[og];W[rg];B[ph]
C[White continues with 'a'. White 'b' is a mistake.]LB[qh:b][rf:a]
(;W[rf];B[rh];W[se]
C[White wins the fight, but Black has sente and strong thickness.])

(;W[qh]C[White 30 loses the game.];B[rf]
C[Black challenges White to a ko];W[pg];B[sb]
C[Black makes a ko threat.];W[qg]
C[White has no ko threats, so must connect.];B[ra]
C[Black captures the corner, giving Black the game.];W[oh];B[ng];W[pi]
;B[mg])
)

(;W[me]C[White 14 is not recommended.];B[rc];W[mb];B[lb];W[na];B[kc];
W[rb];B[nf];W[pf];B[of];W[le];B[kd];W[lg];B[ph];W[qh];B[pi];W[qi];
B[pj])
)

(;W[rc]C[White 12 is a mistake.];B[nd]
C[Black has tremendous thickness.])
)
)

(;W[mb];B[lb];W[nb];B[lc];W[rc];B[of])
)

(;B[nc];W[rd];B[re];W[rc];B[qe];W[of];B[nf];W[og];B[mf];W[pk];B[id])

(;B[rc];W[rb];B[rd];W[nc];B[nd];W[mb];B[lb];W[lc];B[md];W[kb];B[ld];
W[kc];B[qj];W[pi]C[Black has nothing.];B[nb]
C[Later, Black can capture White 10.]LB[rb:10];W[la];B[qb];W[pb];B[ra]
;W[qa];B[sb]C['A' is correct, 'B' is unnecessary.]LB[sa:B][na:A]
(;W[na];B[qb];W[pa])

(;W[sa])
)
)

(;W[nb]
C[An artful move by White. Black continues with 'a *'. Black 'b'
is a mistake.]
LB[mb:b][nc:a]
(;B[nc]C[White continues with 'a *' or 'b'.]LB[rd:b][mb:a]
(;W[mb];B[lb]C[White continues with 'a *'. White 'b' is a trick play.]
LB[lc:b][oc:a]
(;W[oc];B[lc]C[White continues with 'a *'. White 'b' is a mistake.]
LB[of:b][rd:a]
(;W[rd];B[re];W[rc];B[qe]
C[White continues with 'a *'. White 'b' is a mistake.]LB[rf:b][of:a]
(;W[of];B[nf]
C[
* GOOD VARIATION *

Black attaches at 19 not because of the cut at between Black
7 and 9, but to prevent the peep in front of the cut.

White continues with 'a' or 'b'.]
LB[ng:b][og:a]
(;W[og];B[mf])

(;W[ng];B[mf];W[mg];B[lg]
(;W[oh];B[kf])

(;W[lf];B[og];W[oh];B[pg])
)
)

(;W[rf]C[White 18 is a mistake.];B[sf];W[qi];B[pf];W[pg];B[og];W[of];
B[nf];W[pe];B[oe];W[pf];B[ng])
)

(;W[of]C[White 14 is premature.];B[rc];W[rb];B[rd];W[sb]
C[Black continues with 'a' or 'b'.]LB[ne:b][nf:a]
(;B[nf];W[og];B[mf])

(;B[ne];W[ng];B[nf])
)
)

(;W[lc]
C[White 12 is a trick play. Black continues with 'a'. Black 'b'
is a mistake.]
LB[ob:b][ld:a]
(;B[ld];W[kc];B[ob];W[kb]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[oc:b][rc:a]
(;B[rc]C[The result favors Black.

If White later plays 'a'....]
LB[md:a];W[md];B[nd]C[Black must play 19.])

(;B[oc]C[Black 17 is a mistake.];W[rd];B[re];W[rb];B[sd];W[rc];B[qe];
W[pb];B[na];W[la]LB[pa:a])
)

(;B[ob]C[Black 13 is a mistake.];W[kb];B[ld];W[la];B[rc];W[kd]
C[White gets nice shape, and a powerful ponnuki. The two corner
stones are inadequate compensation.])
)
)

(;W[rd];B[re];W[rc];B[qe];W[mb];B[lb]
C[White continues with 'a', or the devious 'b'.]LB[lc:b][oc:a]
(;W[oc];B[ma];W[ob];B[ld];W[of];B[qj];W[ne];B[nd]
C[White continues with 'a'. White 'b' is not recommended.]
LB[kc:b][lf:a]
(;W[lf];B[id])

(;W[kc]C[White 24 is not recommended.];B[kd]
C[Black starts a ko to his advantage.];W[lc];B[jc];W[kb];B[id];W[me];
B[ka];W[la];B[pf];W[pg];B[lb];W[jb];B[ib];W[la];B[qg];W[ja];B[rf]
C[White center stones are now subject to profitable attack by Black.])
)

(;W[lc];B[ld];W[kc];B[ob];W[kb]
C[Black continues with 'a' or 'b'. Black 'b' leads to ko, but to
Black's advantage.]
LB[pb:b][na:a]
(;B[na];W[la];B[oc];W[pb]
C['A' is correct and brings a ko. 'B' and 'C' are wrong.]
LB[oa:C][sd:B][pa:A]
(;B[pa];W[qa];B[ra];W[oa])

(;B[sd];W[pa];B[oa];W[rb];B[qa];W[ra])

(;B[oa];W[rb];B[qa];W[pa];B[sd];W[ra])
)

(;B[pb]C[Black 21 requires a ko, but Black gains a huge advantage.];
W[oc];B[qb];W[rb];B[ra];W[oa];B[qa];W[sc]
C['A' is correct. 'B' loses points on the outside to risk more
points in the ko inside.]
LB[sa:B][se:A]
(;B[se];W[sa];B[sb])

(;B[sa];W[se];B[rf];W[la];B[na];W[ma];B[sf];W[na];B[sd])
)
)
)
)

(;B[mb];W[nc];B[nd];W[rd];B[re];W[rc];B[qe];W[md];B[kc]
C[The result is not unfavorable to Black, but in a handicap game,
White has scope for further trickery.]
;W[pf])
)

(;W[ob]
C[White hopes for a Black mistake with this move. Black replies
with 'a *'. Black 'b' is not recommended.]
LB[nb:b][rd:a]
(;B[rd]
C[Black 9 is correct.

White continues with 'a' or 'b *'. White 'c' is a mistake.]
LB[nc:c][rc:b][mb:a]
(;W[mb];B[lc];W[lb];B[kc]
(;W[qi]C[White is low. Black can press with 'a' or 'b'.]LB[rb:b][kb:a]
(;B[kb]C[White must play 'A'. Tenuki 'B' is wrong.]LB[dp:B][nc:A]
(;W[nc];B[nd];W[rc])

(;W[tt]C[White plays elsewhere, a fatal mistake.];B[rb];W[rc];B[sc];
W[qb];B[pa];W[qa];B[oc];W[nb];B[la])
)

(;B[oc];W[nb];B[rb];W[qb];B[qa];W[pa];B[ra];W[rc];B[sc];W[pb];B[sb];
W[kb];B[jc])
)

(;W[kb]C[White 14 is not recommended.];B[qi];W[og];B[jc]
C[The two White stones will be battered.])
)

(;W[rc];B[nb];W[oc];B[nc];W[of];B[ne]
C[
* GOOD VARIATION *

White's corner is not completely alive, but that doesn't matter.]
;W[dp]C[White plays elsewhere.];B[rb];W[sb];B[qb];W[ra];B[qa];W[oa];
B[sa];W[sc]
C[This ten-thousand-year ko will become seki,
If Black starts the ko on 'A', it is unfavorable for him. So
he will make a seki on 'B'.
White has not much interest to start the ko on 'B'.]
PL[2]LB[ra:B][na:A]
(;B[na];W[ra];B[as];W[bs];B[sa];W[pp];B[sd];W[ra];B[ar];W[br];B[sa];
W[dd];B[pa];W[ra];B[aq];W[bq];B[sa];W[dj];B[pb];W[pj]
C[Black lost three ko threats, while White did get five moves elsewhere.])

(;B[ra])

(;W[ra];B[pp];W[pa];B[sa];W[as];B[bs];W[ra];B[dd];W[pb]
C[Whitre lost a ko threat, while Black got one move more elsewhere.])
)

(;W[nc]
C[White 10 is a mistake. Further, White 10 leaves White in gote.];
B[nd];W[md];B[mb];W[rc];B[kc];W[me];B[of]
C[White must play in the corner to survive, such as 'a'. White
cannot afford to play elsewhere 'b'.]
LB[dp:b][ra:a]
(;W[ra]C[White must play in the corner to live.])

(;W[dp]
C[White plays elsewhere, and the White stones in the corner can
be killed.]
;B[oc];W[nb];B[na];W[pa];B[sc];W[sb];B[ra];W[sd];B[rf];W[qa];B[ma])
)
)

(;B[nb];W[oc];B[nd];W[rd];B[re];W[rc];B[qe];W[of];B[nf]
C[Black is dissatisfied with the result because White's corner
is secure.])
)

(;W[rd];B[re];W[rc];B[qe]
C[White continues with 'a'. 

White 'b' and 'c' are not recommended.
]
LB[ob:c][nb:b][oc:a]
(;W[oc]
C['A' brings a fight which is good for Black, what is the punishment for White 8,
'B' aims for the top side.
]
LB[nc:B][pf:A][rd:8]
(;B[pf];W[nc];B[nd];W[md];B[lc];W[me];B[jd]C[
])

(;B[nc]
C[White continues with 'a'. 

White 'b' only looks right; it is a reducing move for the later
stage of the game.

White 'c' is heavy.
]
LB[pf:c][ne:b][of:a]
(;W[of]
C[Black continues with 'a *'. Black 'b' to 'd' are not recommended.
'e' shows Black playing elsewhere.]
LB[dp:e][pg:d][qg:c][ob:b][nf:a]
(;B[nf]C[White continues with 'a *' or 'b'. White 'c' is a mistake.]
LB[ne:c][ng:b][og:a]
(;W[og]
C['A' concludes the sequence once seen as joseki, 'B' is possible.
]
LB[ne:B][mf:A]
(;B[mf];W[dp]C['A' to 'E' are sente.]LB[ma:E][na:D][mb:C][nb:B][ob:A]
(;B[ob];W[pb]C['A' or 'B'.]LB[na:B][nb:A]
(;B[nb]
C[White immediately lives on 'A' or first forces on 'B' before
living.]
LB[rf:B][ra:A]
(;W[ra])

(;W[rf]C[Black must know he provokes this White move with 19.]
LB[ob:19];B[se];W[ra])
)

(;B[na];W[rb];B[qa];W[pa]C[Neither 'A' nor 'B' kill.]LB[ra:B][sd:A]
(;B[sd];W[ra];B[sc];W[sb])

(;B[ra];W[sd];B[sb];W[qb];B[sa];W[sc];B[ra];W[sa];B[sb];W[qa];B[oa];
W[sa])
)
)

(;B[nb];W[ob])

(;B[mb];W[ob])

(;B[na])

(;B[ma]C['A' is necessary, 'B' -> ko.]LB[pp:B][ob:A]
(;W[ob])

(;W[pp];B[oa]C['A' -> ko, 'B' or 'C' -> death.]LB[sb:C][ra:B][pa:A]
(;W[pa];B[ra];W[ob];B[na];W[sd]C['A' ko, 'B' seki.]LB[qa:B][pb:A]
(;B[pb];W[qb];B[qa])

(;B[qa];W[pb];B[sb];W[rb])
)

(;W[ra];B[pa];W[sb];B[qb];W[rb];B[sd])

(;W[sb];B[ra];W[qa];B[qb])
)
)
)

(;B[ne]C[White may play elsewhere ('a'), or thwart Black with 'b'.]
LB[jc:b][dp:a];W[jc];B[mh];W[ni];B[mi];W[tt]C[White plays elsewhere.];
B[nj];W[pj])
)

(;W[ng];B[mf]C[White continues with 'a'. White 'b' is a mistake.]
LB[rf:b][mg:a]
(;W[mg]
C[Black continues with 'a'. Black 'b' to 'g' are not recommended.

g7,f6,e5,d4,c3,b2,a1]
LB[rf:g][qg:f][rg:e][pg:d][og:c][lf:b][lg:a]
(;B[lg]C[White continues with 'a' or 'b'.]LB[lf:b][oh:a]
(;W[oh];B[kf])

(;W[lf]C[Black continues with 'a' or 'b'.]LB[le:b][og:a]
(;B[og];W[oh];B[pg];W[pf]C[Black continues with 'a' or 'b'.]
(;B[ph];W[pi]
C[Black continues with 'a' or 'b'. Black 'c' is a mistake.]
LB[rg:c][qh:b][oi:a]
(;B[oi];W[qh];B[nh];W[mh];B[qi]
C[White continues with 'a'. The obvious White 'b' is a mistake.]
LB[qg:b][ne:a]
(;W[ne];B[me];W[md];B[le];W[ld];B[ke];W[nd];B[oe];W[kd];B[jd];W[lb]
C[White 43 contains the two Black stones, which retain aji.];B[pj];
W[rf];B[je];W[lh];B[jh])

(;W[qg]C[White 32 is a mistake.];B[pj];W[ne];B[me];W[md];B[le];W[ld];
B[ke];W[nd];B[oe];W[kd];B[jd];W[lb];B[sh]
C[Black 45 allows connection. White loses.])
)

(;B[qh];W[qi];B[rh];W[rf];B[se];W[oi];B[ri];W[lh];B[kg];W[ne];B[me];
W[md];B[le];W[ld];B[ke];W[nd];B[oe];W[kd];B[jd];W[lb];B[sf];W[mi];
B[ie];W[jb])

(;B[rg]C[Black 27 is a mistake.];W[rf];B[sf];W[qg];B[qh];W[rh];B[qi];
W[ne];B[me];W[md];B[le];W[ld];B[ke];W[nd];B[oe];W[sg];B[kd];W[qj])
)

(;B[le];W[ph];B[kf])
)

(;B[le];W[kf];B[og];W[oh];B[pg];W[ph];B[qg];W[qh];B[rg];W[lh])
)
)

(;B[lf]C[Black 19 is not recommended.];W[lg];B[kf];W[rf];B[sf];W[rh])

(;B[og]C[Black 19 is not recommended.];W[oh];B[pg];W[ph]
C[Black continues with 'a' or 'b'.]LB[qg:b][pf:a]
(;B[pf];W[lg])

(;B[qg];W[qh];B[rg];W[lg])
)

(;B[pg]
C[Black 19 is not recommended, as Black ignores the top for the
right.]
;W[ph]C[Black continues with 'a' or 'b'.]LB[qh:b][oh:a]
(;B[oh];W[og];B[qh]
C[White continues with 'a'. White 'b' is not recommended.]
LB[pi:b][pf:a]
(;W[pf];B[rg];W[rf];B[sf];W[qg];B[pi])

(;W[pi]C[White 24 is not recommended.];B[qg];W[ni];B[qi];W[pj])
)

(;B[qh];W[qg];B[pf];W[og];B[pe];W[qi];B[rh];W[ri];B[rg];W[oi])
)

(;B[rg]
C[Black 19 is not recommended, as Black ignores the top for the
right.]
;W[lf];B[ld];W[kh])

(;B[qg]C[Black 19 is not recommended.];W[rf];B[rg];W[sf];B[pf];W[pg]
C[Black may try 'a' or 'b'.]LB[pe:b][oe:a]
(;B[oe];W[pe]
C[Now Black must find a ko; there is unlikely to be one big enough.])

(;B[pe];W[se];B[oe];W[og];B[qi];W[lf];B[me];W[le];B[md];W[kh];B[ql];
W[kc])
)

(;B[rf]C[Black 19 is not recommended.];W[qg];B[rg];W[qi];B[qh];W[ph];
B[rh];W[pi])
)

(;W[rf]C[White 18 is a mistake.];B[sf];W[rh];B[mg];W[nh];B[mh];W[ni];
B[lj])
)

(;W[ne]C[White 16 is a mistake.];B[me];W[oe];B[nd]
C[White may try 'a' or 'b'.]LB[og:b][mf:a]
(;W[mf];B[ng];W[le];B[md];W[og];B[lf];W[mg];B[nh];W[oh];B[ni])

(;W[og];B[ic])
)
)

(;B[ob]
C[Black 15 gives White a reasonable position in the center, while
overconcentrating low.]
;W[pb];B[nb];W[ne];B[nd];W[rf];B[sf];W[sd];B[se];W[rh])

(;B[qg]C[Black 15 is not recommended.];W[rf];B[rg];W[sf];B[pf];W[pg];
B[pe];W[se];B[ne];W[qh];B[rh];W[qi])

(;B[pg]C[Black 15 is not recommended.];W[pf];B[rg];W[rf];B[sf];W[qg];
B[rh];W[pi];B[qj];W[ne];B[nd];W[ke])

(;B[tt]C[Black plays elsewhere.];W[ne];B[nd];W[le])
)

(;W[ne]
C[White 14 should be prepared well by White in the center.

Black continues with 'a'. Black 'b' is submissive.]
LB[nd:b][pf:a]
(;B[pf];W[nd];B[kd];W[pg];B[qg];W[of];B[rf];W[ph];B[qi]
C[Under normal circumstances the White stones are heavy.])

(;B[nd]C[Black 15 is weak.];W[of]C[Good for White.])
)

(;W[pf]C[White 14 is a heavy move, rather obviously bad.];B[ne];W[rf];
B[sf];W[rh];B[ng]C[White is low, and Black has good influence.])
)
)

(;W[nb]
C[White 12 is not recommended.

Black continues with 'a' or 'b'.]
LB[nc:b][pf:a]
(;B[pf];W[nc];B[nd]
C[White 'a' is tough, but Black has the advantage in the fight
ahead. White 'b' gives White a bit of territory while giving
Black imposing thickness.]
LB[lc:b][md:a]
(;W[md];B[lc];W[me];B[jd];W[mg];B[ph])

(;W[lc];B[ld];W[mb];B[kd];W[md];B[me])
)

(;B[nc];W[mb];B[lb];W[oc];B[lc])
)

(;W[ob];B[pf];W[nc];B[nd];W[md];B[lc];W[me];B[nb];W[oc];B[jd])
)
)

(;B[oc]
C[Black 7 is asking for trouble. 

White continues with 'a' or 'b'. 

White 'c' is not recommended, and certainly lacks fighting spirit.]
LB[dp:d][ob:c][rd:b][rc:a]
(;W[rc];B[rd];W[od];B[oe];W[nd]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nc:b][ne:a]
(;B[ne]
C[White continues with 'a' to take the corner, or 'b' if the ladder
is favorable]
LB[md:b][nc:a];W[nc]
C[White has life in the corner, and Black must still defend against
the cut at 'a'.]
LB[pe:a])

(;B[nc];W[ne];B[pf];W[of];B[pe];W[ob];B[nb];W[pa]
C[The sequence concludes.];B[sc]
C[Black should not play here immediately, but this illustrates
how White lives in the corner.]
;W[sb];B[sd];W[qb])
)

(;W[rd];B[re];W[rc];B[qe]
C[White continues with the strong cut of 'a', or 'b'.

White 'c' has complex variations.]
LB[rf:c][ob:b][od:a]
(;W[od]C[Black continues with 'a' or 'b'.]LB[oe:b][rf:a]
(;B[rf]
C[White continues with 'a'. White 'b' and 'c' are not recommended.]
LB[qg:c][ob:b][oe:a]
(;W[oe];B[ob];W[qg];B[rg];W[qh];B[rh]
C[White continues with 'a'.

White 'b' is not recommended, as the White center stones come
under profitable attack by Black.]
LB[pb:b][qi:a]
(;W[qi];B[pb];W[me];B[kd];W[ri];B[tt]
C[Black plays elsewhere.

The White stones in the corner are still a liberty behind.]
;W[qb];B[ra];W[qa];B[se];W[sh];B[sd])

(;W[pb]C[White 20 revives the corner stones, but at too high a price.]
;B[qi];W[og];B[me];W[oi];B[pk])
)

(;W[ob]C[White 14 is an overplay.];B[nc];W[oe];B[qg];W[jc];B[me];W[nf]
;B[mf];W[nh];B[qj]
C[Black makes profit at the right. The Black stones at top are
in no real danger.])

(;W[qg]C[White 14 results in White losing the corner.];B[oe];W[nd];
B[ob];W[md];B[lc];W[nf];B[rg];W[qh];B[rh];W[qi];B[pb])
)

(;B[oe];W[nd];B[nc];W[md];B[rf];W[lc];B[lb];W[nf]
C[Black continues with 'a', taking the corner.
Black 'b' emphasizes the top, at the sacrifice of the White stones
in the corner being able to live.]
LB[kc:b][pb:a]
(;B[pb];W[kb];B[nb];W[la];B[mb];W[kc];B[rb];W[qg])

(;B[kc];W[ld];B[nb];W[qg];B[rg];W[qh];B[rh];W[kd];B[jc];W[pb];B[qi]
C[White must play in the corner, such as shown or risk death.]MA[ra];
W[tt]C[White plays elsewhere.];B[sd]
C[At best, White can get a ko with 'a'.]LB[ra:c][rb:b][oa:a]
(;W[oa];B[rb];W[sb];B[qa];W[ra])

(;W[rb];B[qa];W[ra];B[sb];W[sc];B[pa])

(;W[ra];B[sb];W[sc];B[rb];W[ob];B[oa];W[pa];B[mb])
)
)
)

(;W[ob]
C[Black continues with 'a' or 'b'.

Black 'b' is in preparation for an extension down the right side.

Black 'c' is slow.]
LB[od:c][nd:b][nc:a]
(;B[nc]C[White continues with 'a'. White 'b' sacrifices the corner.]
LB[of:b][rf:a]
(;W[rf];B[sf];W[of];B[oe];W[nf];B[nb];W[pb];B[jc];W[rh])

(;W[of]C[White 14 is an overplay that sacrifices the corner.];B[oe];
W[nf];B[qg];W[rf];B[rg];W[sf];B[pf];W[pg];B[se];W[pe];B[pb];W[pf];
B[qb])
)

(;B[nd]
C[Black 13 intends for an extension down the right side.

White continues with 'a', or 'b' to thwart Black on the right.]
LB[oe:b][nb:a]
(;W[nb];B[qj])

(;W[oe]
C[White 14 is an attempt for White to continue to have a say on
the right side, at the expense of the top.]
;B[od];W[qi];B[nb];W[pb];B[pf])
)

(;B[od]C[Black 13 is not recommended as being slow.];W[nb];B[me])
)

(;W[rf]C[White 12 aims to cut at between Black 1 and 7.]LB[sf:b][oe:a]
(;B[oe];W[se])

(;B[sf];W[od];B[oe];W[nd];B[nc];W[md]
C[Black continues with 'a' or 'b'.]LB[ld:b][of:a]
(;B[of];W[ld];B[lc];W[kc];B[kb];W[nf];B[og];W[jb];B[la];W[jd];B[pb];
W[qb];B[pa];W[sd];B[se];W[sb])

(;B[ld];W[nf];B[of];W[lc];B[lb];W[le]
C[White 'a' and 'c' sacrifice the Black stones at right. 

Black 'b' keeps the stones at least temporarily alive, but under
attack.]
LB[kd:c][og:b][kc:a]
(;B[kc]C[Black sacrifices the stones at right for a clean result.];
W[pf];B[pe];W[og])

(;B[og];W[kd];B[kb];W[ob];B[nb];W[na];B[mb];W[qb];B[ic];W[oi])

(;B[kd]
C[Black takes a larger territory on top, and gives up a larger 
territory at the right, compared to Black 25 played onto the 
marked point.

White continues with 'a'. White 'b' is an overplay that sets
up a ladder that ends the game, unless White has a ladder break 
to the lower left.]
LB[pf:b][ke:a]MA[kc]
(;W[ke];B[ng];W[ne];B[mf];W[me];B[je];W[kf];B[jf];W[kg];B[jd];W[pf])

(;W[pf]
C[White 26 is a mistake unless White has a ladder break to the
lower left.]
;B[pe];W[og];B[rg];W[qh];B[ng];W[ne];B[se];W[qg];B[mf];W[me];B[lf])
)
)
)
)
)

(;W[ob]C[White 8 is a weak move.

Black continues with 'a' or 'b'.]
LB[nd:b][nc:a]
(;B[nc];W[rd];B[re];W[rc];B[qe]C[White continues with 'a' or 'b'.]
LB[oe:b][pf:a]
(;W[pf];B[oe])

(;W[oe];B[pf];W[od];B[qg];W[me];B[nb];W[pa];B[jc]
C[Black dropping to the first line from 19 is sente; for the White
stones in the corner to live, White must play at a 1-2 point.]
MA[na])
)

(;B[nd];W[nb];B[rc];W[rb];B[qi];W[rd];B[re];W[sc];B[qe])
)
)

(;B[rc];W[rb];B[rd];W[nc];B[oc];W[ob];B[od];W[nb];B[nd];W[md];B[lc];
W[ld];B[kc])

(;B[rd]C[Mistake.
];W[nc]LB[nd:A][od:B]
C['A' is trying to enclose White, 'B' is enclosed by White.
]
(;B[nd];W[od];B[oe]C[Black has too many cuts.
];W[oc]LB[ne:A][pf:B]
C['A' saves something on the top, 'B' on the right, but Black has no chance to get a good result, 
]
(;B[ne];W[mb];B[lc];W[lb];B[kc]LB[pf:A][pe:B]
C['A' is correct, 'B' is wrong.
]
(;W[pf]LB[rd:7]C[Punishment of Black 7.
];B[pe];W[pj])

(;W[pe]C[Mistake.
];B[pf];W[qe];B[qg];W[pg];B[rf];W[of];B[re];W[pf];
B[qh])
)

(;B[pf];W[md];B[ne];W[lc];B[mb];W[lb])
)

(;B[od];W[nd];B[oc];W[ob]LB[pb:A][nb:B]
C['A' or 'B' don't avoid being enclosed.
]
(;B[pb];W[nb];B[qb];W[nf])

(;B[nb];W[mb];B[pb];W[na];B[qb];W[nf])
)
)
)

(;W[rd]C['A *' is joseki, 'B' is questionable.]LB[pc:B][re:A]
(;B[re]C['A *' is joseki, 'B' a variation.]LB[rc:B][rb:A]
(;W[rb];B[sd];W[rc];B[qe];W[oc];B[od];W[nc];B[nd];W[md];B[pc];W[pb];
B[mb];W[nb];B[na];W[ob];B[kc];W[me];B[pf]C[
* GOOD VARIATION *])

(;W[rc];B[qe];W[ob]
C['A' leads to a moyo for Black, 'B' is inferior.
If Black plays elsewhere, White will later aim at C.]
LB[nd:C][pf:B][oc:A]
(;B[oc];W[nb]C['A' is correct, 'B' is wrong.]LB[mb:B][nc:A]
(;B[nc];W[mb];B[qj])

(;B[mb];W[nc];B[nd];W[md];B[kc];W[of])
)

(;B[pf];W[nc];B[nd];W[md];B[mb])
)
)

(;B[pc];W[rb];B[qb];W[rc]
C['A' is now big for both sides. If Black occupies 'A', White can
live on 'B'.]
LB[pb:B][jc:A])
)
)

(;B[pc]C[Black 3 is too close to Black 5 to be effective.];W[qd];B[pe]
C[Black 7 is necessary. A White hane at 7 is great for White.];W[qe];
B[jc])
)

(;W[qd];B[qc];W[pc]
C[Black continues with 'a *' or 'b *'. Black 'c' and 'd' are not
recommended.]
LB[qb:d][rc:c][oc:b][od:a]
(;B[od]C[White continues with 'a *'.
White 'b' is a trick play.]
LB[oc:b][rc:a]
(;W[rc];B[qb]C['A *' is correct.
'B' is a trick play.]LB[rd:B][re:A]
(;W[re];B[rb]C['A' is correct, 'B' doesn't work.]LB[lc:B][sb:A]
(;W[sb];B[pb]C[
* GOOD VARIATION *])

(;W[lc];B[ld];W[kc];B[md];W[nb];B[mb];W[pb];B[sc];W[rd];B[ob];W[oc];
B[nc];W[oa];B[qa];W[sb];B[sa];W[sd];B[pa];W[sb];B[ob])
)

(;W[rd]C['A' is correct.
'B' is getting tricked.]LB[rb:B][pb:A]
(;B[pb])

(;B[rb];W[lc];B[ld];W[kc];B[md];W[nb];B[mb];W[pb];B[oc];W[ob];B[sb];
W[sc];B[nc];W[qa];B[na];W[ra];B[oa];W[sa])
)
)

(;W[oc]
C[White 8 is a trick play.
'A' is correct.
'B' is getting tricked.
There can be an additional White stone on 'C'.]
LB[of:C][nd:B][qe:A]
(;B[qe];W[rd]
C[For outside influence, Black plays 'a'; for corner profit, Black
'b'.
'c' gives White the choice.]
LB[nc:c][rc:b][re:a]
(;B[re];W[rc];B[pf]
C[White cannot aim at A because of the threat of Black B.]
LB[qb:B][nc:A])

(;B[rc];W[re];B[nc]C[Black has the corner.];W[qb]
C[White 14 is futile.];B[rb];W[nb];B[mb];W[pb]
C[Black continues with 'a'.
'b' is a mistake.]LB[qa:b][ra:a]
(;B[ra];W[sc];B[pa];W[sb];B[qa];W[ob];B[na])

(;B[qa];W[ra];B[sa];W[oa];B[sc];W[sd];B[ma];W[pa];B[na];W[ra]C[Ko])
)

(;B[nc]C[White takes the corner on 'A' or the outside on 'B'.]
LB[re:B][qb:A]
(;W[qb];B[re];W[rc])

(;W[re])
)
)

(;B[nd];W[qb];B[rc];W[rd];B[rb];W[pb];B[ra];W[nb];B[mb];W[qa];B[nc];
W[sc];B[oa];W[sb];B[ob];W[sa])

(;AW[of]C['A' is correct.
'B' is possible.
'C' is getting tricked.]
LB[nc:C][qe:B][ob:A]
(;B[ob]C[Neither 'A', nor 'B', nor 'C', nor 'D' help.]
LB[nb:D][nc:C][qb:B][pb:A]
(;W[pb];B[qb])

(;W[qb];B[rc])

(;W[nc];B[nd])

(;W[nb];B[nc])
)

(;B[qe];W[rd]C['A' is correct.
'B' is getting tricked.]LB[rc:B][nc:A]
(;B[nc];W[qb];B[re];W[rc];B[pf];W[pg];B[pe];W[og];B[ne])

(;B[rc]C['A' is correct, 'B' is a mistake.]LB[re:B][nd:A]
(;W[nd];B[re];W[pe];B[sd];W[qd];B[rd];W[oe];B[qd];W[nc])

(;W[re];B[nc])
)
)

(;B[nc];W[qb];B[rc];W[pe];B[ne];W[rb])
)
)
)

(;B[oc];W[pb];B[qe]
C[White continues with 'A *'. 'B' is a mistake, leads to a furikawari
disadvantageous in territory.]
LB[pe:B][rd:A]
(;W[rd];B[pe]C[White continues with 'A *', 'B' is a mistake.]
LB[ob:B][re:A]
(;W[re];B[qb]C[White continues with 'A', White 'B*'.]LB[ob:B][pf:A]
(;W[pf];B[ob]C[If White 'A' or 'B' next, Black plays elsewhere.]
LB[qj:B][of:A])

(;W[ob];B[nb];W[od]
C[Black plays 'A', if the ladder is favorable, 'B *' if not.

Black 'C' is a mistake.]
LB[nc:C][oe:B][pa:A]
(;B[pa];W[nc];B[oa];W[oc];B[oe]
C[The ladder to capture the Black stones starts.])

(;B[oe];W[nc];B[nd];W[rb];B[oc];W[rc]
C[
* GOOD VARIATION *

Equal result.])

(;B[nc];W[of];B[oe];W[ne];B[nd];W[pf];B[od];W[me])
)
)

(;W[ob];B[re]C[White continues with 'A', 'B' is a mistake.]
LB[nc:B][rc:A]
(;W[rc];B[nd])

(;W[nc];B[qb])
)
)

(;W[pe];B[rd];W[od];B[qd];W[nc];B[nd];W[ob];B[oe];W[md];B[oc];W[nb];
B[pf];W[ld])
)

(;B[rc]
C[Black 7 follows the proverb, "extend from a crosscut", but this
time the move is a mistake.]
;W[nc]
C[White 8 is a tesuji.

Black continues with 'a'. Black 'b' is tempting, but less favorable.]
LB[oc:b][pe:a]
(;B[pe];W[ob];B[qe];W[md])

(;B[oc]
C[White plays 'a' if the ladder to the lower left is favorable,
'b' if not.]
LB[od:b][nd:a]
(;W[nd]C[White must have the ladder to play this way.];B[nb];W[mb];
B[pb];W[na];B[ob];W[lc])

(;W[od];B[pb];W[pe];B[pc]
C[White plays 'a' if the cut at 'b' can be taken care of.]
LB[oe:b][nd:a];W[nd])
)
)

(;B[qb]C[Black 7 is not recommended.];W[od];B[pe];W[qe]
(;B[oc];W[pf];B[oe];W[qk])

(;B[oe];W[pb];B[oc];W[ob];B[nb];W[nc];B[nd];W[rb]
C[ White 18 is tesuji. The two Black stones are captured.]
LB[rc:b][oc:a]
(;B[oc];W[rc])

(;B[rc];W[qa])
)
)
)

(;W[kc]C[White 4 is typically used in handicap games. 
'A *' or 'B'.]
LB[me:B][qd:A]
(;B[qd]
C[Black attempts to take the corner.

White continues with 'a', 'b *', 'c *', 'd *', 'e' or 'f *'.]
LB[nc:f][rc:e][oc:d][nf:c][of:b][qi:a]
(;W[qi]
C[Black may be pressured by playing elsewhere ('a'), or play 'b'.]
LB[me:b][dp:a]
(;B[tt]
C[Black plays elsewhere.

White continues locally with 'a' or 'b'. White 'a' is the most
frightening. 

White 'c' and 'd' are not recommended.]
LB[mb:d][rc:c][nc:b][oc:a]
(;W[oc];B[od]
C[White continues with 'a'. White 'b' is also possible, but gives
Black incredible thickness.]
LB[ob:b][nc:a]
(;W[nc]C[Black continues with 'a' or 'b'.]LB[md:b][nd:a]
(;B[nd];W[mb];B[md];W[ob];B[pb])

(;B[md]C[White continues with 'a' to 'c'.]LB[qb:c][rc:b][nd:a]
(;W[nd];B[ne];W[mb];B[lb];W[nb];B[lc]
C[White continues with 'a' or 'b'. White 'b' may lead to a sacrifice
of the five White stones.]
LB[me:b][qb:a]
(;W[qb];B[me];W[rc];B[rd];W[of];B[oe];W[tt]C[White plays elsewhere.];
B[sc]
C[Black goes for a ko. White continues with 'a'. White 'b' gives 
Black the ko.]
LB[sb:b][pb:a]
(;W[pb];B[rb];W[oa];B[qa];W[ma]C[White is reduced to two points.]
LB[qc:a])

(;W[sb]C[White faces a ko.];B[pb];W[pc];B[qc];W[rb];B[oa];W[ob];B[qa]
C[Since Black can win by connecting at 'a' (White suffers a lack
of liberties), the ko is direct.])
)

(;W[me]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[le:b][kd:a]
(;B[kd]C[Black continues with 'a', or more boldly with 'b'.]
LB[le:b][qb:a]
(;W[qb];B[nf];W[rc];B[rd];W[pf];B[of];W[le];B[jc];W[lg];B[nh]
C[Black 'a' is a serious threat to make ko, but White can avoid 
it and live. To see how, look into the variation, where White 
immediately plays 20 without cutting on 18 before.]
LB[qb:20][me:18][sc:a])

(;W[le];B[jc];W[oe];B[nf];W[of];B[ng];W[qb];B[rb];W[pb];B[rf];W[rg];
B[re];W[og];B[rc]
C[White continues with 'a'. White 'b' sacrifices the two middle
White stones.]
LB[nh:b][oa:a]
(;W[oa];B[nh])

(;W[nh]C[White 34 is not recommended.];B[mg];W[oa];B[kg])
)
)

(;B[le]C[Black 19 is a mistake.];W[mf]
C[Black continues with 'a', or 'b' or (even worse) 'c' to capture
the five White stones. Neither are recommended.]
LB[pb:c][pc:b][of:a]
(;B[of];W[qb];B[lf];W[mg];B[oh];W[rc];B[rd];W[lg]
C[White 28 is an excellent move. Black has an unfavorable position.])

(;B[pc]C[Black captures the five White stones.];W[kb];B[ma];W[nf];
B[oe];W[kd];B[ld];W[kf]C[White's thickness is superior.])

(;B[pb];W[kb];B[ma];W[nf];B[oe];W[kd];B[ld];W[kf]
C[Black must play 'a' or 'b'.]LB[pc:b][ob:a])
)
)
)

(;W[rc]C[Black continues with 'a' or 'b'.]LB[mb:b][rd:a]
(;B[rd];W[mb];B[lb];W[nb];B[lc];W[nd];B[ne];W[rb]
C[White 20 is a nice move.];B[me];W[of];B[oe]C[This ends the joseki.];
W[cq]
C[White plays elsewhere.

Black 'a' through 'c' are sente, but White cannot be killed by
playing, for example, 'd'.]
LB[pb:d][sc:c][la:b][sd:a]
(;B[sd])

(;B[la])

(;B[sc];W[pb])

(;B[pb]C[Black attempts to kill White.];W[pc];B[sc];W[qb])
)

(;B[mb]
C[White continues with 'a'. White 'b', trying to live in the corner,
is a mistake.]
LB[qb:b][rd:a]
(;W[rd];B[qb])

(;W[qb]C[White 14 is a mistake.];B[rd]
C[White must play 'a'. White dies if 'b'.]LB[nd:b][oa:a]
(;W[oa];B[nd]C[Black 17 is sente.];W[pc]
C[Black has perfect thickness; very bad for White.])

(;W[nd]C[White 16 is suicidal.];B[ne];W[oa];B[pc];W[pb];B[na];W[ob];
B[ra];W[qa];B[sc];W[sb];B[rb];W[sa];B[rb])
)
)
)

(;W[qb];B[mb];W[rc];B[pb];W[rd];B[qc];W[rb];B[nd])
)
)

(;W[ob];B[nc];W[rc];B[rd];W[qb];B[oa]
C[Black 15 is an ancient and famous tesuji.];W[pa];B[pc];W[pb];B[ra];
W[nb];B[mb];W[na];B[rb]C[Black 23 is a sacrifice to squeeze White.];
W[qc];B[sc];W[sb];B[sd];W[qa];B[ma];W[sa];B[me])
)

(;W[nc];B[oc];W[nb];B[nd];W[mb];B[md])

(;W[rc];B[rd];W[oc];B[od];W[nc];B[nd]
C[Black blocks. letting White connect underneath.];W[mb];B[md];W[ob];
B[qb]C[Black has a favorable result.])

(;W[mb]
C[White 8 is an endgame move. Black replies with 'a'. Black 'b'
and 'c' are mistakes.]
LB[lb:c][nb:b][nc:a]
(;B[nc];W[nb];B[ob];W[lc])

(;B[nb]C[Black 9 is a mistake.];W[oc];B[od];W[nc])

(;B[lb]C[Black 9 is a mistake.];W[lc];B[nb];W[md];B[nc];W[kb])
)
)

(;B[me];W[oc]C[White 8 does not work.];B[nc];W[ob];B[pc])
)

(;W[of]
C['A' secures the corner, 'B *' is joseki, but leaves room for
invasion.]
LB[me:B][ne:A]
(;B[ne]C[Black secures the corner.];W[oc];B[nc];W[ob];B[pc])

(;B[me]
C['A *' is joseki, but Black gets a big wall. 'B' is also possible.]
LB[ke:B][oc:A]
(;W[oc];B[od]C['A *' is correct, 'B' is also possible.]LB[nc:B][ob:A]
(;W[ob];B[nc];W[rc]
C['A *' making huge influence, is correct.
'B' is inferior.]
LB[qb:B][rd:A]
(;B[rd];W[qb]C[
* GOOD VARIATION *];B[oa]
C[Black can't kill.
White lives on 'A' or 'B', being fully enclosed.]
LB[pa:B][nb:A]
(;W[nb];B[mb];W[pa];B[pc];W[pb];B[ra];W[na];B[rb];W[qc];B[sc];W[sb];
B[sd];W[qa];B[ma];W[sa])

(;W[pa];B[pc];W[pb];B[ra];W[nb];B[mb];W[na];B[rb];W[qc];B[sc];W[sb];
B[sd];W[qa];B[ma];W[sa])
)

(;B[qb];W[rd])
)

(;W[nc]C['A', 'B' and 'C' leave Black with only a small territory.]
LB[nd:C][md:B][mb:A]
(;B[mb];W[nd];B[ne]LB[md:B][qb:A]
(;W[qb];B[md];W[rc];B[pb];W[rd])

(;W[md];B[ld];W[lc];B[pc])
)

(;B[md];W[rc]C['A' or 'B' favor White.]LB[rd:B][qb:A]
(;B[qb];W[rd])

(;B[rd];W[mb];B[lb];W[nb];B[lc];W[rb];B[oe];W[ke])
)

(;B[nd];W[mb];B[pb])
)
)

(;W[ke];B[mg];W[nf]C['A' or 'B'.]LB[le:B][mf:A]
(;B[mf];W[nc];B[nd];W[oc];B[od];W[mb])

(;B[le];W[kf];B[lg];W[nc];B[nb]
C['A' is a sacrifice for a reduction on the other side. 'B' is
bad shape.]
LB[od:B][oc:A]
(;W[oc];B[ne];W[rc];B[qb];W[rd];B[rb])

(;W[od];B[ob])
)
)
)
)

(;W[nf]
C[Black continues with 'a *'. Black 'b' is complicated. 'c' is
possible.]
LB[oe:c][me:b][nd:a]
(;B[nd]C[Black 7 is correct.

* GOOD VARIATION *])

(;B[me];W[nc]
C[White 8 is a trick play.

Black continues with 'A' or 'B'.
'C' is inferior.
Black 'D' makes matters worse. 'E' is not recommended.]
LB[pf:E][nd:D][oe:C][nb:B][md:A]
(;B[md];W[mb];B[lb];W[ob];B[ma];W[nb];B[lc]
C['A' or 'B' give Black a big wall.]LB[od:B][qb:A]
(;W[qb];B[oe];W[rc];B[rd];W[oc];B[pg])

(;W[od];B[oe];W[pe];B[nd];W[oc];B[of];W[qb];B[rb];W[ra];B[rc];W[re];
B[qc];W[pb];B[na];W[qe];B[oa];W[rd];B[sb];W[sd];B[ph])
)

(;B[nb]
C['A' strenghens the Black corner, 'B' takes the corner while Black
develops outside.]
LB[ob:B][oc:A]
(;W[oc];B[ob];W[pc];B[pb];W[ne];B[qc])

(;W[ob];B[nd];W[oc];B[od];W[mb];B[lb];W[na];B[lc];W[qb];B[kd])
)

(;B[oe]C['A' is correct. 'B' doesn't work.]LB[of:B][mb:A]
(;W[mb];B[pg];W[qh];B[oi])

(;W[of];B[mb])
)

(;B[nd];W[oc]
C[
'A' makes a useless wall, 'B' takes the right side.
'C' doesn't work.]
LB[mb:C][pf:B][od:A]
(;B[od];W[mb])

(;B[pf];W[mb];B[pg])

(;B[mb];W[od];B[oe];W[ne];B[md];W[pe])
)

(;B[pf])
)

(;B[oe];W[of])
)

(;W[oc];B[od];W[nc]
C['A *' and 'B *' are joseki,
Securing life with 'A *' is necessary, if there is an additional
White stone on the triangled position.]
LB[md:B][nd:A]TR[of]
(;B[nd];W[mb];B[md];W[ob];B[pb]C[
* GOOD VARIATION *];W[pc]
C[Later continuation.];B[qb])

(;B[md]C['A *', 'B *' or 'C'.]LB[qb:C][rc:B][nd:A]
(;W[nd];B[ne];W[mb];B[lb];W[nb];B[lc]
C['A *' is joseki, 'B' is a trick play.]LB[me:B][qb:A]
(;W[qb];B[me];W[rc];B[rd];W[of];B[oe]C[
* GOOD VARIATION *]PL[2];B[sc]
C[Later continuation.
'A' leads to a small life, 'B' to a big ko.]
LB[sb:B][pb:A]
(;W[pb];B[rb];W[oa];B[qa];W[ma])

(;W[sb];B[pb];W[pc];B[qc];W[rb];B[oa];W[ob];B[qa])
)

(;W[me]
C['A' is the correct punishment.
'B' is getting tricked, Black is walled in.]
LB[le:B][kd:A]
(;B[kd]C['A', 'B' or 'C' gibe a disadvantageous result.]
LB[oe:C][nf:B][qb:A]
(;W[qb]C['A' or 'B'.]LB[of:B][nf:A]
(;B[nf]C['A' or first 'B'.]LB[pf:B][rc:A]
(;W[rc];B[rd]C[Later Black A.]LB[sc:A])

(;W[pf];B[of];W[rc];B[rd]C[Later Black A.]LB[sc:A])
)

(;B[of];W[rc];B[rd]PL[2];B[sc]
C[Later, White is pressed small.
'A' is necessary, 'B' -> Ko, 'C' -> White dies.]
LB[rb:C][sb:B][pb:A]
(;W[pb];B[rb];W[oa])

(;W[sb];B[pb];W[pc];B[qc];W[rb];B[oa];W[ob];B[qa])

(;W[rb];B[sb];W[oa];B[pb];W[pc];B[ma];W[pa];B[ra])
)
)

(;W[nf];B[oe];W[le];B[jc];W[qb];B[pg];W[rc];B[rd])

(;W[oe];B[nf];W[of];B[ng];W[qb];B[rb];W[pb]
C['A' makes a small living group and aims to attack White on the
right.
'B' is walling in a big White corner,]
LB[og:B][rf:A]
(;B[rf];W[rg];B[rc];W[oa];B[re];W[og];B[nh])

(;B[og];W[qe];B[qg];W[rg];B[rh];W[rd];B[qh])
)
)

(;B[le];W[mf]C['A' is less bad than 'B'.]LB[pb:B][pc:A]
(;B[pc]C['A' or 'B' give the same result.]LB[nf:B][kb:A]
(;W[kb];B[la];W[nf];B[oe];W[kd];B[ld];W[kf]
C[Black 21 can also be on the triangled position.]LB[la:21]TR[ma])

(;W[nf];B[oe];W[kb];B[ma];W[kd];B[ld];W[kf];B[pg];W[lf];B[ob];W[ke];
B[na])
)

(;B[pb];W[kb]C['A' is less bad than 'B'.]LB[la:B][ka:A]
(;B[ka];W[kd];B[ld];W[kf];B[jb];W[lf]
C['A' is necessary. 'B' doesn't work.]LB[of:B][ic:A]
(;B[ic];W[ke];B[la];W[oe];B[nf];W[ng];B[of];W[og];B[pf];W[pg];B[pe])

(;B[of];W[ke];B[la];W[ic];B[pc];W[ia]C['A' or 'B' don't help.]
LB[ja:B][ob:A]
(;B[ob];W[ja])

(;B[ja];W[ib];B[ob];W[jc])
)
)

(;B[la];W[kd];B[ld]
C['A' is correct, if there is no additional Black stone on 'B'.]
LB[pj:B][kf:A]
(;W[kf];B[pc];W[oe];B[nf];W[ng];B[of];W[og];B[pf];W[pg];B[pe];W[lf];
B[ob];W[ke];B[na];W[ka];B[ma])

(;AB[pj]C['A' is correct, 'B' is a mistake.]LB[kf:B][kg:A]
(;W[kg])

(;W[kf];B[lf];W[nf];B[oe];W[lg];B[kg];W[ke];B[mg];W[lh];B[ng];W[of];
B[pf];W[og];B[oh];W[pg];B[qg];W[ph];B[qh];W[pi];B[oi];W[qi];B[ri];
W[qj];B[qk];W[rj];B[rk];W[pe];B[sj];W[pf];B[rf])
)
)
)
)
)
)

(;W[rc]C['A *' or 'B'.]LB[rd:B][mb:A]
(;B[mb]C['A *' or 'B *'.]LB[qb:B][rd:A]
(;W[rd];B[pb]C[
* GOOD VARIATION *])

(;W[qb];B[rd];W[oa];B[nd];W[pc]C[
* GOOD VARIATION *])
)

(;B[rd];W[mb];B[lb];W[nb];B[lc];W[nd];B[ne];W[rb];B[me];W[of];B[oe]
C[Black cannot kill on A.]PL[2]LB[pb:A];B[pb];W[pc];B[sc];W[qb])
)

(;W[qb];B[mb];W[rc]C['A' or 'B'.]LB[pb:B][rd:A]
(;B[rd];W[oa];B[nd];W[pc])

(;B[pb];W[rd];B[qc];W[rb];B[nd])
)
)
)

(;W[rc];B[rd];W[oc];B[od];W[nc];B[nd];W[mb];B[md];W[ob];B[qb])

(;W[nc]C['A *' or 'B'.]LB[nd:B][oc:A]
(;B[oc];W[nb];B[nd];W[mb];B[md]C[
* GOOD VARIATION *];W[ob];B[pb];
W[oe];B[od];W[qb];B[pa];W[qc];B[pc];W[rd];B[re];W[rb];B[sc])

(;B[nd]C['A' is correct, 'B' is a mistake.]LB[oc:B][mb:A]
(;W[mb];B[nb];W[oc];B[ob];W[pc];B[md];W[qc];B[od];W[rd];B[lb];W[rb])

(;W[oc];B[mb]C[Neither 'A' nor 'B' help.]LB[qb:B][od:A]
(;W[od];B[oe];W[pe];B[ne];W[pc];B[qc];W[qb];B[nb];W[pb];B[rb])

(;W[qb];B[od];W[rc];B[rd];W[ob];B[kd];W[jd];B[ke]
C[Later, Black kills on A.]PL[2]LB[oa:A];B[oa];W[pa];B[pc];W[pb];B[ra])
)
)
)
)

(;B[me]C['A' is correct, B gives Black too much strength.]
LB[qc:B][qd:A];W[qd];B[qc];W[pc]
C['A' is correct, 'B' leads to overconcentration.]LB[od:B][pb:A]
(;B[pb];W[oc];B[od]
C['A' is correctm because sente, 'B' is inferior, because gote.]
LB[rc:B][qb:A]
(;W[qb];B[rc];W[ob];B[qe];W[mb];B[pf])

(;W[rc];B[qb];W[re])
)

(;B[od];W[rc];B[qb];W[re];B[rb];W[sb];B[oc])
)
)

(;W[lc]
C[White 4 is not an orthodox move - usually it is an attempt to
confuse Black in a handicap game. 

The nose contact play dates back to at least 1682, when it was
used successfully by the 4th Honinbo Dosaku (1645-1702) (a Go
"saint") against the top Okinawan player of the day, Peichin
Hamahika.

Black continues with 'a *'. Black 'b' and 'c' are submissive.]
LB[lb:c][md:b][ld:a]
(;B[ld]
C[White continues with 'a *' or 'b'. The crosscut of White 'c'
is not recommended.]
LB[md:c][kc:b][mb:a]
(;W[mb];B[md]C[White continues with 'a *'. White 'b' is unreasonable.]
LB[nb:b][lb:a]
(;W[lb]C[
* GOOD VARIATION *];B[oc];W[ic];B[qe])

(;W[nb]C[White 8 should be a mistake.];B[kc];W[pc];B[qc];W[qd];B[oc];
W[pb];B[od]C['a' and 'b' are miai for Black.]LB[qe:b][ob:a])
)

(;W[kc]C[Black continues at 'a' or 'b'.]LB[md:b][mb:a]
(;B[mb];W[kd];B[le]C[White continues with 'a' or 'b'.]LB[qd:b][ke:a]
(;W[ke];B[qe];W[pf];B[ne]C[Black has secured a large corner.];W[qc]
C[White's invasion should fail.];B[re];W[pc]
C[White may try 'a' or 'b'.]LB[ob:b][rb:a];B[od]
C[White may fruitlessly try 'a' or 'b'.]LB[ob:b][rb:a]
(;W[rb];B[ob];W[pb];B[sc])

(;W[ob];B[sb])
)

(;W[qd];B[qc];W[pc];B[pb];W[oc];B[od]
C[White continues with 'a'. White 'b' is unreasonable.]LB[qb:b][rc:a]
(;W[rc];B[qb];W[rb];B[qe];W[rd];B[ob];W[pe];B[oe];W[pf];B[hd]
C[Black attacks the three White stones with the pincer of Black
25.])

(;W[qb];B[rc];W[ob];B[qe];W[nd]
C[Black must cut at 'a', even though it means being squeezed. Black
'b', to avoid the squeeze, lets White out to the center.]
LB[oe:b][nc:a]
(;B[nc];W[pe];B[rd];W[oe];B[qd];W[ne];B[md]
C['a' and 'b' are miai for Black.]LB[rf:b][rb:a])

(;B[oe]C[Black 21 is a mistake.];W[nc];B[md];W[ne]C[White is out.])
)
)
)

(;B[md];W[ob]
C[White's trick play. After it there are many continuarions where
Black can either choose the right move or gets tricked.
Black can play 'a' or 'b'.]
LB[mb:b][oc:a]
(;B[oc];W[qc];B[qd];W[pc]
C[Black 'a' establishes a position.
Black 'b' is getting tricked.]
LB[nc:b][od:a]
(;B[od];W[rd];B[nb];W[re]
C[Black can live on A and aim for thickness on B.]LB[id:B][pb:A])

(;B[nc];W[rd];B[re];W[rc];B[qe];W[pf]
C[White a and b are possible continuations.]LB[rf:b][oe:a])
)

(;B[mb]C[White continues with 'a' to 'c'.]LB[qd:c][pc:b][od:a]
(;W[od]
C[Black continues with 'a' or 'b'. Black 'a' may be a complicated,
but ultimately leads to a loss for White. 
Black 'b' starts an adavantageous fight.]
LB[pc:b][oe:a]
(;B[oe];W[pe];B[oc];W[pc]
C[Black continues with 'a'. Black 'b' is getting tricked.]
LB[nd:b][qd:a]
(;B[qd]
C[White 'a' leads to a ko. White 'b' makes a small life in the
corner, but Black gets huge influence.]
LB[qc:b][nc:a]
(;W[nc];B[nd]C['A' starts a ko, 'B' loses everything.]LB[oc:B][qc:A]
(;W[qc];B[qe];W[pf];B[oc])

(;W[oc];B[qc];W[qb];B[rb];W[ra];B[rc]C[Neither 'A' nor 'B' help.]
LB[qe:B][re:A]
(;W[re];B[pa];W[oa];B[na];W[pb];B[nb];W[qa];B[sb])

(;W[qe];B[re];W[rf];B[pa];W[oa];B[na];W[qa];B[nb];W[pb];B[sb];W[se];
B[sa])
)
)

(;W[qc];B[qe];W[pf];B[nd];W[rc])
)

(;B[nd];W[qd];B[od];W[pb])
)

(;B[pc];W[oc];B[pe];W[ne];B[oe];W[nd];B[pg];W[kd];B[lf];W[ng];B[qg])
)

(;W[pc]
C[Black 'a' is correct. 

Black 'b' is weak, allowing White to connect his stones. 

Black 'c' gives Black part of the corner (but overconcentrated)
or a start on the right side (at the expense of giving White
the corner).]
LB[qe:c][od:b][qd:a]
(;B[qd];W[od]
C[The hane of Black 'a' is correct. Black 'b is getting tricked.]
LB[pf:b][oe:a]
(;B[oe]
C[White may try 'a' or 'b'. The cut of White 'b' leads to a ko
fight favorable to Black.]
LB[pe:b][qc:a]
(;W[qc];B[qe];W[pf];B[nd];W[oc];B[pe];W[rf];B[rc];W[rb];B[rd];W[sb];
B[ng])

(;W[pe]C['A' or 'B' are ok.]LB[oc:B][nd:A]
(;B[nd];W[oc];B[qc];W[qb];B[rb];W[ra];B[rc];W[re];B[pa];W[qa];B[nb];
W[oa];B[na];W[qe];B[nc];W[pb];B[sa];W[sb];B[sc];W[of];B[ne])

(;B[oc];W[nc];B[nd])
)
)

(;B[pf];W[pe];B[qe];W[oe];B[qg];W[rf];B[rg];W[of];B[pg];W[rc];B[re];
W[id])
)

(;B[od]C[Black 11 is weak.];W[rd];B[qd];W[rc];B[id])

(;B[qe]C[Black 11 is not recommended.];W[pe];B[od];W[qd]
C[Black takes part of the corner with 'a'.

Black 'a' gives Black part of the corner, but his stones are
overconcentrated.

Black 'b' gives Black a start on the right side at the expense
of giving White the corner.]
LB[re:b][qc:a]
(;B[qc];W[re];B[rd];W[qe];B[qb];W[rc];B[rb];W[sd];B[oc])

(;B[re];W[rd];B[rf];W[qg];B[pf];W[oe];B[pg];W[nd];B[qh])
)
)

(;W[qd]C[Black 'a' resists. Black 'b' submits.]LB[pc:b][qc:a]
(;B[qc];W[pc];B[od];W[qb];B[qe];W[rc]
C[Black 'a' starts a ko. Black 'b' leaves a cutting point.]
LB[re:b][rd:a]
(;B[rd]C['A' -> deceisive ko, 'B' gives Black superior thickness.]
LB[qc:B][re:A]
(;W[re];B[qc])

(;W[qc];B[pe];W[re];B[rf];W[sd];B[qg])
)

(;B[re]C[White can aim at the red dot cutting point.]CR[pe];W[pe];
B[pf];W[oe];B[ne];W[of];B[pg];W[og];B[ph];W[mg];B[rf])
)

(;B[pc];W[qc];B[pb])
)
)
)
)

(;W[md];B[nc]C[Black follows the proverb: extend from a cross cut.];
W[kc];B[kd];W[jd];B[me];W[ic];B[qe]
C[If White 'a', Black attacks with 'b'.]LB[pi:b][pf:a];W[pf]
C[White 14 is heavy.];B[pi])
)

(;B[md]
C[White 4 now looks like a forcing move. Black 5 therefore is submissive.]
;W[ob]
C[If Black has the ladder to catch White 4, Black should play 'a'.
Black 'b', keeping White from connecting, is tempting, and troublesome.]
LB[mb:b][oc:a]
(;B[oc]C[Black plays 7 when the ladder is favorable.];W[qc];B[qd];
W[pc];B[od];W[rd]
C[Black continues with 'a' if the ladder is favorable. If not,
Black must play 'b'.]
LB[nb:b][re:a]
(;B[re]C[Black must have the ladder to play this way.];W[rc];B[qe];
W[mb];B[lb];W[nb];B[kc])

(;B[nb]
C[Black 13 is bad, but necessary if Black does not have the ladder
to catch White 4.]
;W[re];B[jc])
)

(;B[mb]
C[Black 7 is not recommended. 

White continues with 'a'. White 'b' is tempting, and dangerous.]
LB[od:b][pc:a]
(;W[pc]
C[Black can let White cross under with 'a', or struggle with 'b'.]
LB[qe:c][qd:b][od:a]
(;B[od];W[rd]
C[Black continues with 'a' or 'b'. White can still connect his
stones.]
LB[qd:b][qc:a]
(;B[qc];W[qb])

(;B[qd];W[rc])
)

(;B[qd];W[od];B[pf];W[pe];B[qe];W[oe];B[qg];W[rf];B[rg];W[of];B[pg];
W[rc];B[re];W[jc]
C[White has the corner, and the three Black stones under attack.])

(;B[qe]
C[White continues with the tricky tesuji of 'a'. White 'b' looks
standard, but is a mistake.]
LB[pf:b][pe:a]
(;W[pe];B[qd];W[od])

(;W[pf]C[White 10 is a mistake.];B[od]
C[The two White stones have aji.];W[rd];B[re];W[rc]
C[Black may try 'a' or 'b'.]LB[rb:b][qb:a]
(;B[qb];W[rb]C[Black has nowhere to go.])

(;B[rb];W[qb])
)
)
)

(;W[od]C[White 8 is not recommended. White faces trouble];B[oe];W[pe];
B[oc];W[pc]
C[Black continues with 'a'. Black 'b' is obvious, and a mistake.]
LB[nd:b][qd:a]
(;B[qd];W[nc];B[nd]
C[White continues with 'a'. White 'b' is a mistake.]LB[oc:b][qc:a]
(;W[qc])

(;W[oc]C[White 16 is a mistake, though not obviously so.];B[qc];W[qb];
B[rb];W[ra];B[rc];W[qe];B[re];W[rf];B[sd];W[sb];B[pa]
C[Black 27 seals White's fate.])
)

(;B[nd]C[Black 13 is a mistake.];W[qd]
C[Black could connect ('a') or play a ko.]LB[od:a];B[od];W[pb]
C[White steals the corner.])
)
)
)

(;B[lb];W[mb]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[kb:b][nb:a]
(;B[nb];W[md];B[nc];W[kb];B[ma]
C[White plays 'a' to consolidate, or plays elsewhere, taking the
moves as forcing moves. Regardless, Black has played submissively.]
LB[kd:a];W[kd])

(;B[kb]
C[White plays 'a' to keep the situation fluid (and more difficult
for Black). White 'b' and 'c' follow the proverb of 'extend from
a cross-cut', but do not work as well.]
LB[md:c][nc:b][pc:a];W[pc])
)
)

(;W[ob]
C['A *' is joseki, 'B' is slightly disadvantageous in territory.]
LB[pb:B][oc:A]
(;B[oc];W[qc];B[qd]
C['A *' is joseki -> White is enclosed in the corner.
'B' is inferior. Black takes the corner, and Black 2 is weakened,
while White connects to the top very low.
'C' connects to White 2, but throws away White 4.]
LB[ob:4][qf:2][rd:C][nb:B][pc:A]
(;W[pc];B[nc];W[rd];B[re];W[rc];B[qe];W[pf];B[oe]
C[
* GOOD VARIATION *])

(;W[nb];B[nc];W[mb];B[pb];W[lc];B[pc])

(;W[rd];B[nb];W[rb];B[pb])
)

(;B[pb];W[pc]
C['A' is correct and takes a lot of territory on the right.
'B' creates a small group on the top, while White 2 suffers in
the shadow of a Black wall.]
LB[qf:2][qc:B][oc:A]
(;B[oc];W[qc];B[nb];W[od];B[oa];W[pe];B[nd];W[qd])

(;B[qc];W[oc];B[od];W[qb];B[rb];W[pa];B[rd];W[mb])
)
)

(;W[rc]C['A' or 'B'.]LB[qc:B][rd:A]
(;B[rd];W[qd])

(;B[qc];W[qd];B[pc];W[re])
)

(;W[pc]C['A *' is joseki, 'B' is a mistake.]LB[qc:B][od:A]
(;B[od]C['A *' is joseki, 'B' is not.]LB[qc:B][qd:A]
(;W[qd];B[qc]
C[
* GOOD VARIATION *

'A' is usual.
'B' i spossible with an additional White stone on the triangled
position.]
LB[oc:B][rc:A]TR[of]
(;W[rc];B[qb];W[re];B[rb];W[sb];B[oc])

(;AW[of];W[oc]C['A' is correct, 'B' is a mistake.]LB[nc:B][qe:A]
(;B[qe];W[rd]C['A' is correct, 'B' is a mistake.]LB[re:B][nc:A]
(;B[nc]C['A' takes the corner, 'B' the outside.]LB[pe:B][qb:A]
(;W[qb];B[re];W[rc];B[pe])

(;W[pe];B[ob])
)

(;B[re];W[nd];B[rc];W[pe];B[sd])
)

(;B[nc];W[qb];B[rc];W[pe])
)
)

(;W[qc];B[qd])
)

(;B[qc]C['A', 'B' and 'C' lead to a low White group on the top.]
LB[nc:C][oc:B][od:A]
(;W[od];B[oc];W[pb]
C[After 'A' White must fight for a small life. 'B' encloses a small
White corner with huge influence.]
LB[ob:B][qd:A]
(;B[qd];W[nc];B[nd];W[ob];B[oe];W[md];B[oc])

(;B[ob];W[qd];B[pe];W[qb];B[qe];W[rc];B[re];W[rd];B[ne])
)

(;W[oc];B[od];W[qb];B[rd];W[mb];B[nd];W[lc];B[rb]
C[After 'A' White connects to the top left. After 'B' White is
enclosed on top, but creates a group on the right.]
LB[pj:B][ob:A]
(;W[ob];B[ld];W[kc];B[qi])

(;W[pj];B[nb];W[nc];B[md];W[ob];B[lb];W[na];B[kc]C[Ladder on A.]
LB[ld:A])
)

(;W[nc];B[nd];W[od];B[oe];W[oc];B[qd];W[mb];B[md];W[lb];B[pf])
)
)

(;W[rd]C['A' is ok, 'B' can not be recommended.]LB[qh:B][qc:A]
(;B[qc];W[qi])

(;B[qh];W[qc];B[qe];W[re];B[pf];W[pg];B[qg];W[rf];B[of];W[oc];B[pc];
W[pb];B[od])
)

(;W[od];B[oc];W[qd]C['A' punishes, 'B' doesn't.]LB[pe:B][qc:A]
(;B[qc];W[pe];B[pc])

(;B[pe];W[qe];B[qc];W[rc])
)

(;W[pj]LB[qd:A][qc:B]
C[Black 'A' is gote. If Black takes sente, the White invasion on B remains possible.
]
;B[qd])
)

(;B[pf]
C[
Tobi-Tsuke (jump-attach)
----------------------------

First step of the Tsuke-Nobi-Joseki. The move should be played only if Black has a big moyo on the top side. The aim of this joseki is to make shape quickly. The approach
is defensive.

White continues with 'a *'. White 'b' is a trick play. White must
have the ladder to play 'b'. 'c' is bad.
]
LB[pe:b][pg:a][qe:c]
(;W[pg]
C[Black continues with 'A *' or 'B'. Black 'c' is an old joseki.
]
LB[qe:A][of:B][og:C]
(;B[qe];W[of];B[pe]
C[White continues with 'A *' to 'C'. White 'D' is less preferable
to 'A'. 
If the right side is unimportant because of a low Black position
in the lower right, 'E' is the only move.
]
LB[rf:A][og:B][qg:C][rg:D][mg:E]
(;W[rf]
C[White 8 is very territory oriented, a play to make when the center
is unimportant.

Black continues with 'a *', 'b' or 'c'.
]
LB[pi:c][re:b][og:a]
(;B[og];W[ph]C[Black continues safely with 'a', or 'b *'.
]
LB[oh:b][nf:a]
(;B[nf];W[oh]C[Black continues with 'a' or 'b'.]LB[oe:b][ng:a]
(;B[ng]C[White continues with 'a' or 'b'.]LB[qc:b][re:a]
(;W[re];B[qc])

(;W[qc]C['A' is correct, 'B' is wrong.]LB[re:B][pc:A]
(;B[pc];W[rd];B[jc])

(;B[re];W[ob];B[mc])
)
)

(;B[oe];W[re]C[One must consider carefully the timing of White 14.];
B[rd];W[qc]
C[White 16 is a tesuji to start a living group in the corner.];B[qd];
W[rc];B[sd];W[ob];B[mb]C[Black 21 is a severe checking move.];W[ra]
C[White 22 is the vital point for White to live.
'A' closes in the corner in gote, 'B' enlargens the wall.]
LB[nh:B][oc:A]
(;B[oc];W[nb];B[nc];W[pc];B[lc])

(;B[nh];W[ni];B[mh])
)
)

(;B[oh]
C[White continues with 'A *' or 'B'. Fighting on 'C' strenghens Black..
]
LB[nf:C][oi:B][pi:A]
(;W[pi]C[White 12 is submissive.];B[nf];W[re];B[qc];W[ql]
C[
* GOOD VARIATION *
])

(;W[oi];B[nf];W[re];B[qc];W[ni])

(;W[nf]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[oi:b][pi:a]
(;B[pi];W[oi]C[The outcome of the fight is unpredictable.];B[mg];W[qi]
;B[pj];W[qj];B[pk])

(;B[oi]C[Black cannot get a favorable result playing 13 here.];W[pi])
)
)
)

(;B[re]C[Black 9 cedes no territory to White.];W[og];B[md];W[qi]
C[White 12 protects against the cut at the marked spot. The result
favors Black]
MA[qg])

(;B[pi]C['A' builds a base in gote, 'B' a wall in sente.]
LB[oi:B][oh:A]
(;W[oh];B[nd];W[oi];B[pk];W[qi])

(;W[oi];B[ph];W[og];B[rh];W[qg];B[nd]C['A' or 'B'.]LB[oj:B][ok:A]
(;W[ok];B[qk];W[oh])

(;W[oj];B[qk];W[oh];B[pm])
)
)
)

(;W[og]
C[Black continues with 'a'. Black 'b' and 'c' are not recommended.]
LB[nd:c][rg:b][qg:a]
(;B[qg];W[qh];B[rf]C['A' is necessary, 'B' is a mistake.]
LB[nd:B][rg:A]
(;W[rg]C[Black continues with 'a'. Black 'b', connecting, is timid.]
LB[qf:b][nd:a]
(;B[nd])

(;B[qf]C[Black 13 is a mistake.];W[nd]
C[White has the good point that Black should have taken.];B[rh];W[ri];
B[sg];W[qi])
)

(;W[nd];B[rh])
)

(;B[rg]
C[Black 9 is not recommended. White should ignore Black 9 and play
'a'. White 'b' is a mistake.]
LB[rh:b][nd:a]
(;W[nd];B[qi]C[Black has a low position. White 10 is the prime spot.])

(;W[rh]C[White 10 is a mistake.];B[rf];W[qh];B[nd])
)

(;B[nd]C['A' or 'B'.]LB[pl:B][rf:A]
(;W[rf]
C['A' is slow, but necessary. If omitted, White invades on 'B',]PL[2]
LB[qc:B][re:A]
(;B[re])

(;W[qc]C['A' or 'B'.]LB[re:B][pc:A]
(;B[pc];W[re])

(;B[re];W[ob])
)
)

(;W[pl];B[qg];W[qh];B[rf];W[rh])
)
)

(;W[qg]
C[Black continues with 'a' or 'b'. White 'c' is not recommended.]
LB[mc:c][og:b][nd:a]
(;B[nd];W[qk];B[jc]C[The joseki concludes.];W[qc]
C[This demonstrates that the corner is safe from invasion.];B[pb];
W[rd];B[re];W[pc];B[oc];W[qb];B[ob]C[White cannot live in the corner.]
;W[rb];B[qa]C['a' and 'b' are miai.]LB[sc:b][ra:a])

(;B[og]C[The cut of Black 9 is a severe move.
'A' or 'B'.]
LB[oh:B][nf:A]
(;W[nf]C['A' or 'B' are ok.]LB[ng:B][oh:A]
(;B[oh];W[qj];B[nd])

(;B[ng];W[mf];B[mg];W[lf];B[lg];W[kf];B[pi];W[ri];B[rj];W[qj];B[qi];
W[rk];B[rh];W[sj];B[qh])
)

(;W[oh];B[ng];W[pi];B[mh])
)

(;B[mc]C[Black 9 leaves aji in the corner.];W[qk];B[tt]
C[Black plays elsewhere.];W[pc]C[Black may try 'a' or 'b'.]
LB[oc:b][qc:a]
(;B[qc];W[oc]C[White cannot be caught.];B[qb];W[nd])

(;B[oc];W[qc]C[Black may try 'a' or 'b'. Black 'c' is a mistake.]
LB[ob:c][rd:b][nd:a]
(;B[nd]C[Black defends against the cut.];W[rd];B[re];W[rb])

(;B[rd]C[Black goes for the kill (but can't get it).];W[ob];B[nc];
W[rc];B[nb];W[pa])

(;B[ob]C[Black 14 is a mistake that could easily cost Black the game.]
;W[re];B[rd];W[qd];B[rf];W[se];B[sf];W[od]C[Black is captured.];B[sd];
W[re];B[se];W[oe];B[re];W[rc])
)
)
)

(;W[rg]C[Black continues with 'a' or 'b'.]LB[re:b][og:a]
(;B[og];W[ph];B[nf])

(;B[re]C[Black cedes no territory.];W[og];B[rf];W[qg]
C[Black continues with 'a' or 'b', another extension at top, or
plays elsewhere.]
LB[pk:b][me:a]
(;B[me]
C[Black 13 is the obvious extension; having secured territory,
balancing with a move emphasizing influence.])

(;B[pk]
C[Black 13 is played with support at bottom right, or as an invasion.])
)
)

(;W[mg];B[nd])
)

(;B[of]
C[
Tsuke-Nobi
-------------

White continues with 'a' to 'd'. White 'd' is a special case
when Black has support at top. White 'e' is a trick play.
]
LB[pc:e][qc:d][re:c][qd:b][qe:a]
(;W[qe];B[qd]
C[White continues with 'a' to 'c'.
If White is already strong on the right side, he enlarges his
territory with 'd'.
'e' tenuki is wrong.]
LB[ph:d][og:c][qh:b][qj:a]
(;W[qj]
C[
This move is not sente to cut.
'A' is joseki. 'B' is correct, if there is already a stone around A.
'C' is a leaning attack against a weak White group on the top side.
]
LB[nd:B][jc:A][ph:C]
(;B[jc]
C[The obvious White 'a' is a mistake. 

White invades with 'b'.

White 'c' is an attempt to complicate the situation to fool a
weaker player.

The invasions of White 'd' and 'e' are not as good as 'b'.]
LB[kd:f][lc:e][mc:d][rd:c][nc:b][pe:a]
(;W[pe]C[White 10 illustrates the outside turn to the cut, a mistake.]
;B[oe];W[od];B[nd];W[oc];B[rd]
C[Black 15 is the vital point.

After 'A', White gets an unfavorable ko, after 'B', he dies in
the corner.]
LB[qg:B][re:A]
(;W[re];B[qg];W[rg];B[qh];W[rh];B[nc]C['A' is correct, 'B' is wrong.]
LB[ob:B][pb:A]
(;W[pb];B[nb];W[rb];B[qb]C['A' is correct, 'B' is wrong.]
LB[qa:B][qc:A]
(;W[qc];B[pc];W[ob];B[rc];W[qa];B[oa];W[qc];B[se];W[rf];B[qb])

(;W[qa];B[ob];W[pc];B[qc];W[pa];B[ra];W[sa];B[oa])
)

(;W[ob];B[se];W[rf];B[nb];W[qb];B[rb];W[ra];B[qc])
)

(;W[qg];B[nc]C[Neither 'A' nor 'B' work.]LB[ob:B][pb:A]
(;W[pb];B[nb];W[rb];B[pc];W[ob];B[qb];W[qa];B[qc];W[pa];B[ra];W[sa];
B[na])

(;W[ob];B[nb];W[qb];B[rb];W[ra];B[qc];W[pb];B[sb];W[re];B[sd];W[qa];
B[oa])
)
)

(;W[nc]C[White 10 is the vital point for invasion.];B[oc]
C[White continues with 'a' or 'b'.

With White 'a', Black builds influence on the left. With White
'b', Black takes the corner.]
LB[md:b][nd:a]
(;W[nd]C[tachi (stand)];B[pe];W[kd];B[jd];W[ke];B[je];W[kf];B[ig])

(;W[md];B[nd];W[nb];B[je];W[ob];B[pb]
C[White continues with 'a'. White 'b' is a trick play. White 'c'
is a mistake.]
LB[ne:c][qb:b][mf:a]
(;W[mf];B[rd])

(;W[qb]
C[White 18 is a trick play.
'a' is correct, 'b' is getting tricked.]
LB[oa:b][qg:a]
(;B[qg]
C[Black 19 foils the trick play. Black 19 is a sacrifice play.
White may try 'a' to 'c'.]
LB[pa:c][rg:b][qh:a]
(;W[qh]C[Black 19 becomes a sacrifice.];B[rg];W[rh];B[og];W[ph];B[oa]
C[White will have trouble taking care of the invading stones at
top.

White cannot connect by playing 'a' because of Black 19 and 21.]
LB[qc:b][rd:a]
(;W[rd];B[rc];W[re];B[qc])

(;W[qc];B[pc];W[rd];B[rc])
)

(;W[rg];B[qh];W[rh];B[oa];W[qc];B[pc];W[rd];B[rc]
C[Black 27 prevents White from crossing under.])

(;W[pa];B[qh])
)

(;B[oa]C[White 19 is a mistake. White has been tricked.];W[qc];B[pc];
W[rd];B[mc];W[ne];B[od];W[lc];B[mb];W[lb];B[na];W[le]
C[Black either has to escape with 'a', or make two eyes in gote
with 'b'.]
LB[nb:b][ng:a])
)

(;W[ne]C[White 18 is a mistake.];B[od];W[qb];B[pa];W[qc];B[rb]
C[Black 23 is a (te)suji.];W[rc];B[rd];W[sd]
C[Black continues with 'a'. Black 'b' and 'c' are mistakes.]
LB[re:c][se:b][sb:a]
(;B[sb];W[sc];B[re])

(;B[se]C[Black 27 is a mistake. White gets a ko.];W[sb];B[ra];W[re])

(;B[re]C[Black 27 is a mistake. White will be able to connect at top.]
;W[ra];B[sb];W[pc])
)
)
)

(;W[rd]C[White 10 is a feint.];B[rc];W[pe];B[oe];W[od]C['A' or 'B'.]
LB[oc:B][nd:A]
(;B[nd];W[oc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[re:b][pb:a]
(;B[pb]C[White continues with 'a'. White 'b' doesn't work.]
LB[pc:b][ob:a]
(;W[ob];B[pc];W[mc];B[ld];W[lc];B[kd];W[jb];B[ib];W[kb];B[ic];W[mb])

(;W[pc]C[White 18 is a mistake.];B[qc];W[ob];B[nb];W[qb];B[nc];W[pa];
B[rb];W[ra];B[re]C['A' or 'B'.]LB[rf:B][sd:A]
(;W[sd];B[se];W[rf];B[sc]C['A' or 'B'.]LB[sf:B][qh:A]
(;W[qh];B[na];W[oa]
C[Black 'a' to protect against the cut, or 'b' to provoke a ko
to settle the corner.]
LB[sa:b][mf:a]
(;B[mf]
C[The corner becomes a seki (unless Black 'a', forcing the ko).]
LB[sa:a])

(;B[sa]C[Black forces a ko to resolve the corner with Black 35.])
)

(;W[sf];B[na];W[oa];B[ph];W[qh];B[og];W[qg];B[pi])
)

(;W[rf];B[sd];W[sb];B[na];W[oa])
)
)

(;B[re]C[Black 17 is a mistake.];W[qc];B[sd];W[pc];B[rd];W[rf])
)

(;B[oc];W[nd];B[nc];W[md])
)

(;W[mc]
C[As an invasion, White 10 misses the mark. White heads for trouble.];
B[oc];W[le];B[je];W[lg];B[nh])

(;W[lc];B[nc];W[le];B[je];W[lg];B[nh])

(;W[kd];B[jd];W[ke];B[lb];W[mc];B[lc];W[md];B[oc]
C[Both Black groups are secure, while White is heavy. Black can
continue profitably harrassing White.])
)

(;B[nd]PL[2];B[ql]
C[Later continuation.
White can secure his group on 'A' or 'B'.
After tenuki 'C' Black can make a painful reduction.]
LB[dp:C][ph:B][oj:A]
(;W[oj])

(;W[ph])

(;W[dp];B[qh]C['A' and 'B' sacrifice, 'C' is pressed down low.]
LB[qg:C][qi:B][rh:A]
(;W[rh]C['A' and 'B' give the same situation.]LB[ri:B][rg:A]
(;B[rg];W[qg];B[ri];W[qi];B[ph];W[sh];B[sg];W[oh];B[pi];W[oj];B[og];
W[oi];B[si];W[rh];B[sh];W[pj];B[rh];W[rj];B[re];W[qn]
C[White sacrifices some stones.])

(;B[ri];W[qi];B[rg];W[qg]C[Same variation as 16 played before 14.]
LB[ri:14][rg:16])
)

(;W[qi];B[ph];W[rh];B[rg];W[qg]
C[Same variation as 16 played before 14,]LB[ph:14][rg:16])

(;W[qg];B[qi]C['A' is correct, 'B' is a mistake.]LB[pj:B][rj:A]
(;W[rj];B[oi];W[rh];B[ri];W[si];B[oh])

(;W[pj];B[rj];W[rk];B[oh]C['A' or 'B' are no help.]LB[ri:B][ph:A]
(;W[ph];B[pi];W[oi];B[oj];W[ni];B[pk])

(;W[ri];B[rh];W[ph];B[pi];W[oi];B[si])
)
)
)
)

(;B[ph];W[og];B[qg];W[qh];B[rg];W[rh];B[ng];W[oh];B[nh];W[oi])
)

(;W[qh];B[nd]C[Black must answer with 9.];W[lc];B[jc]
C[White continues with 'a' or 'b'.]LB[le:b][oc:a]
(;W[oc];B[nc];W[nb]C[Black continues with 'a' or 'b'.]LB[mb:b][od:a]
(;B[od];W[pb];B[mc];W[mb];B[ld];W[kc];B[kd];W[jb];B[ib];W[kb];B[ic])

(;B[mb]C[Black 15 is a tough-minded move.];W[ob];B[mc];W[od];B[pe];
W[ne];B[me];W[nf];B[og])
)

(;W[le];B[je]C[White continues with 'a'. White 'b' is a mistake.]
LB[nb:b][oc:a]
(;W[oc];B[od];W[nb]C[Black continues with 'a' or 'b'.]LB[nc:b][pb:a]
(;B[pb];W[lg];B[nh])

(;B[nc];W[pb];B[pc];W[ob];B[mc];W[mb];B[lb];W[kb];B[ld];W[kc];B[kd];
W[jb];B[ic])
)

(;W[nb]C[White 14 is timid.];B[oc];W[ob];B[pb])
)
)

(;W[og]C['A' is correct, 'B' is inferior.]LB[nd:B][ng:A]
(;B[ng]
C[White continues with 'a'. White 'b' is unreasonable. White 'c'
helps Black.]
LB[nh:c][nf:b][qi:a]
(;W[qi];B[nd])

(;W[nf]
C[White 10 starts a disadvantageous fight with the cut. 'A' is
correct, 'B' and 'C' are mistakes.]
LB[mf:C][ne:B][nd:A]
(;B[nd]C['A' or 'B'.]LB[ne:B][mf:A]
(;W[mf];B[nh];W[qi];B[ld]
C[The prospects for the two White stones are not good.];W[lg])

(;W[ne];B[od];W[le];B[lc];W[lg];B[nh];W[qi];B[mi])
)

(;B[ne];W[mf])

(;B[mf];W[ne];B[od];W[nd])
)

(;W[nh];B[mg];W[mh];B[lg];W[qh];B[jc]C[Still, White can invade at A.]
LB[nc:A];W[nc];B[oc];W[ob];B[pb])
)

(;B[nd];W[qk]C[Later, White jumps to A.]LB[mg:A])
)

(;W[pe]
(;B[oe];W[od];B[rd];W[qh];B[nd];W[oc];B[nc];W[pb]
(;B[qb];W[nb];B[mb];W[mc];B[md];W[lc];B[lb];W[ld]
(;B[kb];W[me];B[ne];W[og];B[nf];W[lg])

(;B[mf];W[kb])
)

(;B[nb];W[rb];B[pc];W[ob];B[qb];W[qa];B[qc];W[pa];B[ra];W[sa];B[na];
W[re];B[oa];W[ra];B[rc];W[sd];B[sb])
)

(;B[od];W[oe];B[nd];W[ne])
)

(;W[tt]C['A' is the correct punishment, 'B' is helping White.]
LB[og:B][pi:A]
(;B[pi];W[og];B[ng];W[oh])

(;B[og];W[ph])
)
)

(;W[qd]C[Black continues with 'a' or 'b'.]LB[qg:c][qc:b][qe:a]
(;B[qe];W[re];B[pe];W[rg]
C[Joseki continues with 'a'. Black 'b' first is out of order.]
LB[og:b][qc:a]
(;B[qc]
(;W[rd];B[og];W[ph];B[jc];W[pc]
C[White 16 illustrates why Black 15 should be so wide. White must
play 16 before supporting stones ruin the opportunity (where
Black pushes White out toward the top where White cannot make
life).

The difference between White 16 and White 'a' is over twenty
points.]
LB[rc:a];B[oc];W[pb]
C[Black continues with 'a', unless there are supporting stones
for the tough move of 'b'.]
LB[qb:b][ob:a]
(;B[ob];W[qb];B[je])

(;B[qb]AB[je][lf]
C[Black 19 can be played with support such as the black stones
shown.]
;W[ob];B[nb];W[nc];B[pa];W[od];B[oa];W[oc];B[mb]
C[The White stones cannot escape.])
)

(;W[og]C[In the local context, White 12 is not good.];B[rd]
C[White continues with 'a'. White 'b' is not good.])
)

(;B[og]C[Black 11 is not recommended.];W[qc];B[ph];W[qg];B[pc];W[oh])
)

(;B[qc]C[White continues with 'a' or 'b'.]LB[re:b][qe:a]
(;W[qe];B[pc];W[qi];B[jc]C[White invasion point at A.]LB[lc:A];W[lc];
B[ke];W[me];B[og];W[ph];B[mf];W[nc];B[ob])

(;W[re];B[rd];W[qe];B[rc]
C[White continues with 'a'. White 'b' is also possible, though
it give Black superior thickness. White 'c' is not recommended.]
LB[pc:c][pe:b][qj:a]
(;W[qj];B[nd])

(;W[pe]C[White 12 takes the corner, sacrificing thickness.];B[oe];
W[pc];B[od];W[oc];B[nc];W[nb];B[mb];W[ob];B[mc];W[qb];B[qg];W[rg];
B[qh];W[rh];B[se];W[rf];B[qi]
C[White will likely have to capture the Black corner stones, thus
getting about 15 points. Black's thickness should translate to
more.])

(;W[pc]C[White 'c' is not recommended.];B[oc];W[pe];B[od];W[oe];B[ne];
W[nf];B[og];W[ph]C['A' or 'B'.]LB[mf:B][me:A]
(;B[me];W[ng];B[jd]C[Black can still play a ladder block.])

(;B[mf];W[ng])
)
)
)

(;B[qg]C['A' is correct, 'B' and 'C' are mistakes.]
LB[qh:C][pe:B][qe:A]
(;W[qe];B[ph];W[pc];B[og];W[nc])

(;W[pe];B[oe];W[qe];B[ph]C[After 'A' or 'B' Black gets a good result.]
LB[od:B][pc:A]
(;W[pc];B[od])

(;W[od];B[pc];W[oc];B[qc];W[rg];B[og];W[rc];B[rb];W[rd];B[ob];W[nb];
B[pb];W[mc];B[sb];W[rh];B[kc])
)

(;W[qh];B[qe];W[rg];B[qc])
)
)

(;W[re]
C[White 6 should not be ignored by Black.

Black continues with 'a' to 'd'.]
LB[qe:d][qd:c][qc:b][rd:a]
(;B[rd];W[qd];B[qc];W[qe]
C[This is the same joseki as the variation of White 8, Black 9 
played before White 6, Black 7, see there for continuation.]
LB[rd:7][qc:9][qd:8][re:6])

(;B[qc];W[qj];B[jc])

(;B[qd]AB[jd]C[Black may play this way with support at top.])

(;B[qe]C['A' or 'B'.]LB[rf:B][qd:A]
(;W[qd]
C[This is the same joseki as the variation of White 8 played before 
6, see there for continuation.]
LB[re:6][qd:8])

(;W[rf];B[qc];W[qj];B[jc])
)
)

(;W[qc]AB[jd]
C[White may play 6 when Black has a stone at top to prevent Black
from solidifying his territory.

Black continues with 'a' or 'b'. Black 'c' is a mistake.]
LB[qd:c][pc:b][qe:a]
(;B[qe]
C[White continues with 'a'. White 'b' is odd. White 'c' is a hopeful
mistake.]
LB[pc:c][qg:b][ob:a]
(;W[ob]
C[Black continues with 'a' or 'b'. Black 'b' is a stronger move.]
LB[pc:b][qg:a]
(;B[qg];W[mc])

(;B[pc];W[pb];B[rc];W[rb];B[qd];W[qb];B[mb];W[rd];B[re];W[sc]
C[Black no longer has to play 'a'.]LB[qg:a])
)

(;W[qg]C[White 8 is a mistake. The invasion of White 6 is lost.];B[pc]
;W[re];B[qd];W[rd];B[rc])

(;W[pc]
C[White 8 hopes for a Black hane, but Black has a better play.
Black continues with 'a'. Black 'b', the hane, is a mistake.]
LB[oc:b][nc:a]
(;B[nc]C[Black 9 seals White in building thickness. 'A' or 'B'.]
LB[oc:B][nb:A]
(;W[nb];B[mb];W[ob];B[mc]
C[Black 'a' is sente, so White cannot aim at connecting at 'b'.]
LB[qg:b][rd:a])

(;W[oc];B[nd];W[nb];B[mb];W[oa];B[qg])
)

(;B[oc]C[White 9 is a mistake.];W[ob]C['A' or 'B'.]LB[nc:B][nb:A]
(;B[nb];W[qd]C[Black has too many cutting points. 'A' or 'B'.]
LB[re:B][nd:A]
(;B[nd];W[re];B[pe];W[qg])

(;B[re];W[nc])
)

(;B[nc];W[nb];B[mc])
)
)
)

(;B[pc]
C[Black 7 gives up considerable territory, but is consistent in
emphasis (the top). Black ends in sente. If a handicap game,
keeping situations simple is a good approach.]
;W[qd];B[qe];W[re];B[pe]
C[White continues with 'a'. White 'b' is a minor mistake.]
LB[qg:b][rg:a]
(;W[rg];B[og];W[ph])

(;W[qg]
C[White 12 is a mistake.

Black continues with 'a'. Black 'b' fails.]
LB[og:b][rf:a]
(;B[rf];W[rd];B[og];W[pi];B[oh];W[qj])

(;B[og]
C[Black 13 is a mistake. Black fails to take advantage of a good
opportunity by first cutting at 'a'.]
LB[rf:a];W[qb];B[pb];W[oh]
C[White has a much better position (than the other variation where
Black cuts at 'a' first rather than Black 13).]
LB[rf:a];B[rf]C[The cut of Black 17 no longer works.];W[rg];B[rd];
W[sf])
)
)

(;B[qd]C[Black 7 is a mistake.];W[pc];B[oc];W[ob]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nb:b][nc:a]
(;B[nc];W[nb];B[mc];W[rd];B[re];W[rc];B[qe]
C[Black gote, & White 2 still has aji.

Black's stones are very inefficiently placed.])

(;B[nb];W[rd]C[Black does not have a good reply.])
)
)

(;W[pc]AB[jd]
C[White hopes for a Black mistake ('b'). White continues with 'a'
or 'c'.]
LB[qc:c][oc:b][qe:a]
(;B[qe];W[oc]
C[Black best continues with 'a'. Black 'b' is less advantageous.]
LB[qc:b][mc:a]
(;B[mc]
C[White lives on 'A'. Running out on 'B' is disadvantageous. White
'C' is a mistake.]
LB[mb:C][nd:B][rc:A]
(;W[rc])

(;W[nd];B[md];W[ne];B[lf];W[mg];B[og]
C[Keeping White under attack automatically lets Black take the
right side.])

(;W[mb]C[White 10 is a mistake.];B[nb];W[nc];B[lb]
C[White is better off with the other variation.])
)

(;B[qc]C[Black 9 is not recommended.];W[qb];B[rc];W[lc]
C[White gets an adequate position. Black is dissatisfied.])
)

(;B[oc]C[Black falls into the trap.];W[qc]C['A' or 'B'.]LB[ob:B][qe:A]
(;B[qe];W[ob]
C[Black continues with 'a'. Black 'b' only makes matters worse.]
LB[nb:b][nc:a]
(;B[nc];W[nb];B[mc];W[mb];B[lc])

(;B[nb]C[Black compounds the mistake.];W[re]
C[A lot of cutting points, but Black is the one being cut for a
loss.])
)

(;B[ob];W[re])
)

(;B[qc];W[oc];B[qb]C['A' emphasizes the top, 'B' the right side.]
LB[qe:B][lc:A]
(;W[lc];B[qg])

(;W[qe];B[od];W[lc];B[qd])
)
)
)

(;B[og]C['A' is an old-style joseki, 'B' is possible.]PL[2]
LB[pe:B][ph:A]
(;W[ph]C['A' or 'B' are possible.]LB[qe:B][of:A]
(;B[of];W[qe];B[qd];W[ql])

(;B[qe];W[of];B[pe];W[rf];B[nf];W[re];B[qc];W[ql]
C[Same result as the variation where Black 7 and 9 are played before
Black 5.]
LB[og:5][pe:9][qe:7])
)

(;W[pe];B[of]
C[White 'a' and 'b' take a side hugher than in joseki giving a
wall.
White 'c' is a mistake difficult to punish.]
LB[oe:c][qe:b][qd:a]
(;W[qd];B[oe];W[qe];B[pc];W[ph])

(;W[qe];B[oe];W[qd];B[pc];W[ph])

(;W[oe]
C[White 8 is a mistake.

Black continues with 'a'. 'b' is nonsense.]
LB[qd:b][qe:a]
(;B[qe];W[qd];B[re]C['A' or 'B' don't help..]LB[qc:B][rd:A]
(;W[rd];B[rf];W[qg]C['A' or 'B',]LB[pc:B][qc:A]
(;B[qc];W[rc]C['A' is possible, 'B' is a mistake.]LB[rb:B][pc:A]
(;B[pc];W[ne];B[rb];W[rg];B[sc];W[oh];B[mf])

(;B[rb]C['a' or 'b' don't help.]LB[qb:b][pc:a]
(;W[pc];B[od];W[ne];B[sc];W[qb];B[sd];W[qc];B[oc];W[ob];B[qa];W[pb];
B[nc]C['a' is correct. 'b' is a mistake.]LB[oh:b][nb:a]
(;W[nb]C['A' or 'B' don't help.]LB[mc:B][rg:A]
(;B[rg]C['A' is correct, 'B' and 'C' are inferior, 'D' is a mistake.]
LB[qi:D][mc:C][pi:B][rh:A]
(;W[rh];B[mc];W[sg]C['A' or 'B' don't help.]LB[qh:B][se:A]
(;B[se];W[sh])

(;B[qh];W[ph];B[qi];W[se])
)

(;W[pi];B[qi];W[ph];B[qj];W[mc])

(;W[mc];B[ph])

(;W[qi];B[rh]C['A' or 'B' cannot punish Black.]LB[mc:B][oi:A]
(;W[oi];B[mc];W[ri];B[mb];W[sh];B[se];W[sg];B[na];W[qh];B[oa];W[si];
B[pa])

(;W[mc];B[pi];W[qh];B[qj];W[ri];B[rj])
)
)

(;B[mc];W[rg];B[se];W[sg]C['A' or 'B' don't help.]LB[sb:B][mb:A]
(;B[mb];W[sf];B[sb];W[ra];B[sa];W[ra])

(;B[sb];W[ra];B[mb];W[sf];B[sa];W[ra])
)
)

(;W[oh]C[White 30 is a game-losing mistake.];B[mf];W[nf];B[ng];W[mg];
B[nh];W[ni];B[mh];W[lg];B[me])
)

(;W[qb]C[White 18 is a mistake.];B[pc];W[sb];B[pb];W[ra];B[ne])
)
)

(;B[pc];W[ne]C['A' is correct, 'B' is a mistake.]LB[rg:B][rc:A]
(;B[rc];W[rg];B[qc];W[sf];B[sd];W[oh];B[mf])

(;B[rg]C['A' is the correct punishment, 'B' fails.]LB[rh:B][qb:A]
(;W[qb];B[qc];W[rc];B[pb];W[qa];B[sb];W[rb]
C['A' is correct,
'B' -> disaster for Black.]LB[mc:B][pa:A]
(;B[pa]
C['A' secures for White an advantageous position.
'B' creates onjly a disadvantageous ko.
'C' -> Black gets an advantageous position.]
LB[rh:C][sa:B][sd:A]
(;W[sd]C['A' or 'B' don't help.]LB[mc:B][sa:A]
(;B[sa];W[od];B[se];W[oc];B[sc];W[ra];B[sb];W[ob];B[sc];W[oa];B[ph])

(;B[mc];W[rh])
)

(;W[sa];B[ra];W[od];B[sd];W[sa])

(;W[rh];B[sd];W[sg];B[se];W[sh];B[sc];W[sf];B[ra])
)

(;B[mc];W[rh])
)

(;W[rh];B[rc];W[qi])
)
)
)

(;W[qc];B[pc];W[pb];B[oc];W[ne];B[rf];W[nc];B[ob];W[qb];B[mb]
C[Bad for White.])
)

(;B[qd];W[qe];B[nc];W[oh]
C[The three heavy Black stones are now cut off and make no sense.])
)
)
)
)

(;W[pe]
C[White 4 is a trick play. White must have the ladder to play this
way.

Black continues with 'a' if the ladder favors White, or 'b' with
a favorable ladder.]
LB[qe:b][oe:a]
(;B[oe]C[Black plays 5 here when the ladder favors White.];W[qe]
C[Black continues with 'a'. Black 'b' is an overplay. Black 'c'
is wrong.]
LB[pg:c][qd:b][od:a]
(;B[od];W[pg];B[of];W[qd];B[qc];W[rc];B[rb];W[qb];B[pc]
C[White continues safely with 'a', or provokes a fight with 'b'.]
LB[sb:b][rd:a]
(;W[rd]C[White 16 is safe.];B[pb];W[qj];B[jc])

(;W[sb]C[White 16 is a tough move.];B[qg];W[qh];B[rg];W[ra];B[qi];
W[og];B[rh];W[ng];B[ld]
C[Black has solid footing for the fight ahead, while White's three
stones are floating in the center.])
)

(;B[qd]C[Black 7 is an overplay.];W[od]
C[Black would like to play down from 7 (the triangle), but White
b is a double atari, so Black must continue at 'a', 'b' or 'c'.]
LB[oc:c][of:b][nd:a]TR[rd]
(;B[nd];W[oc];B[nc];W[pb]
C[White 12 is the tesuji that gives White the advantage.];B[nb];W[qc];
B[rd];W[rc]C[Black ends up being captured.])

(;B[of];W[oc];B[rd];W[qh];B[pc];W[md])

(;B[oc];W[nd]
C[After 'A' Black is heavy.
'B' was played by Cho Chikun against Kobayashi Satoru in the
2nd game of the 20th Kisei, not having the ladder, but support
on the right.]
LB[pg:B][nc:A]
(;B[nc];W[md];B[of];W[qh])

(;B[pg];W[pc];B[qc];W[of];B[ne];W[og];B[oh];W[me];B[nf];W[ng];B[mf];
W[nh];B[mi]C[This moves breaks both ladders on A and 'B'.]
LB[ph:B][lf:A];W[ph];B[qg];W[rg];B[qh];W[qi];B[rh];W[ri];B[sh];W[sg];
B[pi];W[si];B[ph];W[pj];B[oi])
)
)

(;B[pg];W[od])
)

(;B[qe]C[Black must have the ladder to play this way.];W[oe]
C['A' is correct, 'B' is inferior.]LB[qg:B][qd:A]
(;B[qd]C['A' is correct, 'B' helps Black.]LB[qg:B][pg:A]
(;W[pg];B[nc];W[of])

(;W[qg]
C['A' is correct, Black sacrifices one stone to get a good position.
'B' is a mistake, White develops strong groups on both sides,
but the Black center stones remain heavy.]
LB[pg:B][nd:A]
(;B[nd];W[ne];B[me];W[od];B[oc];W[og];B[md]
C[The result, Black territory and thickness, greatly favors Black.])

(;B[pg];W[ph];B[nf];W[pi];B[ng];W[od];B[oc];W[nc];B[ob];W[me])
)
)

(;B[qg];W[qd];B[rf];W[re];B[qf];W[pc];B[rd];W[od];B[rc];W[kc]
C[Black has a low, overconcentrated position, White has got more
points.])
)
)

(;W[qe];B[pe]LB[pg:A][qc:B][qd:C]
C['A', 'B' or 'C' don't give White a good position.
]
(;W[pg];B[qg];W[qh];B[rg];W[rh];B[og];W[ph];B[qd];W[rf];B[re];W[sg])

(;W[qc];B[pc];W[qd];B[qg];W[rg];B[qh];W[rh];B[qi])

(;W[qd];B[qg];W[rg];B[qh];W[rh];B[qi])
)
)

(;B[qh]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

White usually continues with 'a *', 'b *', 'c *' or tenuki 'f'.

White 'd *' is an emergency move giving Black many points and shouldn't be used without an exact reason. White support in the lower right or center will be helpful.

White 'e *' has been put in disfavour by some pros recently,
only good if White already as many stones in the middle, as he
gets a wall in gote or with a hole. 'e *' also leads to a punishment,
if Black doesn't have the ladder.

'g' is good, if Black can make no big extension on either side.
]
LB[qd:g][dp:f][of:e][ph:d][nc:c][nd:b][qc:a]
(;W[qc]
C[White enters at the 3-3 point in the overwhelming majority of
cases. The one-space jump common with amatuers is not recommended.

Black continues with 'a *' or 'b *'. Black needs support at the
top to play 'b *'.
]
LB[pc:b][qd:a]
(;B[qd];W[pc]
C[Black continues with 'a *'. Black 'b' represents a change in
strategy from influence to territory. Black 'c' is a mistake.]
LB[oc:c][rc:b][od:a]
(;B[od];W[rd];B[re];W[rc];B[qe];W[nc]
C[
* GOOD VARIATION *

With a White stone on the squared position, Black can do nothing bigger than extend to 'A'.
Later, Black can aim on 'B' or 'C', White may jump to 'D', aim at 'E' or enlargen
his group on F.
As the triangled extension from his wall is near, Black shall
not immediately capture the White stone on G.
]
PL[1]LB[of:D][rf:E][mc:F][pf:G][lc:C][me:B][qk:A]TR[qh]MA[pp]
(;AW[pp]LB[qk:A][qn:B]
C['A' is coorect, 'B' just invites an invasion into the moyo Black makes.
]
(;B[qk]
C[Very slow move. So the whole top right corner joseki after Black 5 fell into professionals' disfavor.
]
LB[qd:5])

(;B[qn];W[np]LB[pk:A][rp:B]C['A' and 'B' don't secure the moyo.
]
(;B[pk];W[qi]C[White will survive.
])

(;B[rp];W[qq];B[pl];W[qj]C[White can't be killed.
])
)
)

(;B[me]LB[mc:A]C[White 'A' is correct, tenuki is not recommended.
]
(;W[mc]C[
* GOOD VARIATION *])

(;B[mc]LB[nb:A][mb:B]C['A' is correct, 'B' is not recommended.
]
(;W[nb])

(;W[mb];B[lc]LB[lb:A][nb:B]
C[After 'A' or 'B', Black has just been unnecessarily strengthened.
]
(;W[lb];B[kc]PL[1];B[ob]C[Later, Black closes the top side in sente.
]
;W[oc];B[nb];W[pb];B[kb])

(;W[nb])
)
)
)

(;B[lc]PL[2]LB[mc:A][nd:B]
C[White usually answers on 'A', but 'B' is also possible. If White tenukis, Black plays 'B'.
]
(;W[mc];B[ld])

(;W[nd];B[ne];W[me];B[md];W[mb];B[le];W[mf])

(;B[nd])
)

(;W[of])

(;W[rf]PL[1]LB[sf:A][pf:B]
C[If Black is strong on the lower right side, he can try to kill the White invasion stones on 'A', else he can cover on 'B'.
]
(;B[sf]
C[White 'A' or, with an additional stone on the triangled position, 'B'.
]
LB[sg:A][rh:B]TR[rj]
(;W[sg];B[se];W[rh];B[pf];W[rg];B[qg];W[ri])

(;AW[rj];W[rh])
)

(;B[pf];W[se])
)
)

(;B[rc]C[Black 7 emphasizes territory, a change in original strategy.]
;W[rb];B[rd]C[White continues with 'a' or 'b'.]LB[nc:b][oc:a]
(;W[oc];B[pf];W[lc])

(;W[nc];B[od];W[mb];B[pg])
)

(;B[oc]
C[Black 7 is a mistake.
'A' is the usual punishment, 'B' is slightly inferior.
]
LB[rc:A][rd:B]
(;W[rc]C['A' closes the right, 'B' the top side.
]LB[rd:A][od:B]
(;B[rd]LB[od:A][nc:B]C['A' is correct, 'B' is inferior.
]
(;W[od]LB[oe:A][nc:B]C['A' is correct, 'B' is wrong.
]
(;B[oe];W[nd];B[pf];W[nc])

(;B[nc];W[pe];B[oe];W[nd];B[md];W[ne];B[of];W[nf]LB[qe:A][pf:B]
C['A' or 'B' don't help.
]
(;B[qe];W[qg])

(;B[pf];W[qe])
)
)

(;W[nc];B[od];W[ob]LB[rc:8][rd:9]
C[Compared to White 8 onto 9, White has lost points and aji.
])
)

(;B[od]C['A' is better than 'B'.
]LB[re:A][rd:B]
(;W[re];B[rd];W[sd];B[pf]LB[qg:A][pg:B]C['A' is correct, 'B' is bad.
]
(;W[qg];B[pg];W[rh];B[id];W[qi];B[ph];W[pi])

(;W[pg];B[qg];W[pe];B[of];W[qe];B[oe]LB[rg:A][id:B]
C['A' lives, 'B' dies.
]
(;W[rg];B[rh];W[sf];B[ob];W[pb];B[hc])

(;W[id];B[ob];W[rg];B[rh];W[sf];B[ra])
)
)

(;W[rd];B[pf];W[qg];B[pg];W[rh];B[id];W[qi];B[ph];W[rj])
)
)

(;W[rd];B[re];W[rc];B[qe]LB[nc:A][od:B]C['A' or 'B'.
]
(;W[nc]C['A' is correct, 'B' is a mistake.]LB[ob:B][od:A]
(;B[od];W[ob])

(;B[ob];W[od];B[nb];W[nd];B[mc];W[md];B[lc];W[rf];B[pf];W[se];B[pe];
W[pg];B[of];W[mf];B[og];W[ph];B[qg];W[nh];B[oh];W[pi];B[oi];W[qi])
)

(;W[od];B[nc];W[rf];B[oe];W[se];B[nd])
)
)
)

(;B[pc]AB[jd]C[Black 5 when a supporting stone at top exists.];W[qd];
B[pe]C[White continues with 'a *' to 'c'. 'd' is a mistake.]
LB[qe:d][pf:c][qb:b][rf:a]
(;W[rf];B[og]C[
* GOOD VARIATION *])

(;W[qb]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[og:b][pf:a]
(;B[pf];W[rf]
C[Black continues with 'A' to secure much territory or 'B' to avoid
being cut.]
LB[oh:B][pb:A]
(;B[pb];W[pg]
C[If the direct cut is good depends on the positions in the center
and lower right.]
;B[qg];W[og];B[pj])

(;B[oh];W[pb];B[nc];W[nb];B[mb];W[oc];B[od];W[ob];B[mc])
)

(;B[og]
C[Black 9 is not recommended. White continues with 'a'. Playing
elsewhere is not recommended.]
LB[dp:b][pb:a]
(;W[pb])

(;W[tt]C[White plays elsewhere, not recommended.];B[pb];W[rf]
C[White 12 is submissive, but now necessary.])
)
)

(;W[pf]C[White 8 was common when this pattern first appeared.];B[qe];
W[re]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[rf:b][rd:a]
(;B[rd]
C[Black 11 is the tesuji for this situation.

White continues with 'a'. White 'b', letting Black capture the
two stones, is good only in the rare middle-game case, that White
can create a lot of territory on the right side, while the situation
on the top is no more promising for Black..]
LB[rg:b][rc:a]
(;W[rc]C[White 12 is the only move.];B[rf];W[sd]
C[Black continues with 'a'. 'b' is a mistake.]LB[rg:b][of:a]
(;B[of];W[rg];B[pg];W[sf]
C['A' is joseki. 'B' is not absolutely necessary.]LB[qg:B][ng:A]
(;B[ng];W[oh];B[og]
C[Later, White invades on 'A' or 'B'. Black wants to forestall
the invasion, e.g. on C.]
LB[pb:C][mc:B][lc:A]
(;W[lc];B[kc];W[nc];B[ne];W[kb];B[jb];W[kd];B[jc];W[md];B[ke];W[ob];
B[pb];W[mb])

(;W[mc];B[ld];W[pb];B[ob];W[oc]C['A' is right, 'B' is wrong.]
LB[qb:B][nc:A]
(;B[nc];W[nb];B[od];W[oa])

(;B[qb];W[oe];B[pa];W[od];B[pb];W[nb])
)
)

(;B[qg];W[rf];B[ng];W[oh];B[og])
)

(;B[rg];W[of];B[pb];W[qb];B[md];W[oi];B[qk];W[lf]C[White is better.])
)

(;W[rg];B[se];W[rf];B[rc];W[nf])
)

(;B[rf]C[Under ordinary circumstances, Black 11 is a mistake.];W[rg];
B[rd];W[sf]C[White gladly abandons the two corner stones.];B[rc]
C['A' is a trick move which builds White influence if Black isn't
tricked. 'B' keeps the top open for later invasions.]
LB[nf:B][oe:A]
(;W[oe]C['A' is necessary, Tenuki 'B' is a mistake.]PL[2]
LB[dp:B][nd:A]
(;B[nd];W[ne];B[md];W[me];B[ld];W[pi])

(;B[dp];W[qb]C['A' gives some, 'B' much territory to White.]
LB[rb:B][pb:A]
(;B[pb];W[rb])

(;B[rb];W[pb];B[ob];W[oc])
)
)

(;W[nf])
)
)

(;W[qe];B[pf];W[pg]C[This move doesn't work.];B[qg];W[og];B[qb];W[rb];
B[pb];W[ra];B[pi]
C[This is sente against the middle as well as the corner. White
defends the corner on 'A' or has a ko in the corner after 'B'.]
LB[mg:B][rf:A]
(;W[rf];B[ni])

(;W[mg];B[rf];W[re];B[sd];W[rg];B[rc]C['A' -> Ko, 'B' -> Death.]
LB[sb:B][sf:A]
(;W[sf];B[sb];W[rh];B[ri];W[rd]C[Ko.])

(;W[sb];B[se];W[sf];B[qa];W[rh];B[ri];W[rf];B[sh])
)
)
)
)

(;W[nd]
C[This move is bad, if there is a Black stone on or near C.
'A *' or 'B'. 'A' is the easy joseki, 'B' leads to an equal fight.
'C' goes for outside influence.]
LB[jd:C][qe:B][pf:A]
(;B[pf]
C[
'A *' is joseki,
Playing 'B' or 'C' without 'A' at first is too early. 'D' gives
the corner for a wall to the right.]
LB[pe:D][pc:C][qc:B][pg:A]
(;W[pg]C['A *' or tenuki 'B'.]LB[dp:B][qg:A]
(;B[qg];W[pc]
C['A *' and 'B' are joseki. 'C' is a mistake because of the two
marked stones.]
LB[qc:C][of:B][qe:A]TR[nd][pg]
(;B[qe];W[qc]
C['A *' concludes the joseki, but is oftenly omitted for sente.
Later or immediately, White continues on 'B'.
A followup move for White is 'C'.
If there is a Black stone on one of the marked stones, Black
can cut on D.]
PL[2]LB[oc:D][rf:C][lc:B][of:A]TR[jc][jd]
(;B[of]C[
* GOOD VARIATION *])

(;B[lc]
C['A' takes territory, 'B' aims to attack Black or push into the
center.]
LB[nc:B][nb:A]
(;W[nb])

(;W[nc])
)

(;W[rf];B[re];W[of];B[pe]
C[A and B are now sente for Black. The White influence is now better
than if he had played 4 on sansan.]
LB[nd:4][ne:B][lc:A])
)

(;B[of];W[qc];B[qd];W[od];B[rc];W[rb]
C[Later, White captures on A in sente.]PL[2]LB[rd:A];W[rd];B[re];W[sc]
;B[rf])

(;B[qc];W[pe];B[of];W[qd];B[od];W[oe];B[oc];W[nf];B[og];W[nc])
)

(;B[dp];W[pc]C['A' is correct, 'B' is a mistake.]LB[qg:B][of:A]
(;B[of];W[qe];B[qg];W[qd];B[od];W[oc];B[nc]C[End of sequence.];W[mc]
C[This is a mistake.];B[nb];W[mb];B[qc];W[ob];B[pb];W[na];B[rc];W[rd];
B[rb];W[qa];B[rf];W[sc];B[pe])

(;B[qg];W[pe];B[of];W[qd];B[od];W[oe];B[oc];W[nf];B[og];W[nc];B[ob];
W[ng];B[oh])
)
)

(;W[qc]C['A' is joseki, 'B' is questionable.]LB[pc:B][qe:A]
(;B[qe];W[pc])

(;B[pc];W[qd];B[pe];W[rf];B[pg];W[jc];B[qb];W[rb];B[pb];W[ra];B[mc]
C[The result ist considered playable, because White 4 is high and
can be undermined.]
LB[nd:4])
)

(;W[pc]
C['A' reverts to joseki, 'B' is a variation and not a mistake,
because White made the mistake, not to play on the marked point
before.]
LB[qc:B][qe:A]TR[pg]
(;B[qe];W[qc]
C[If there is a Black stone on one of the marked points, the Black
cut on A is possible.]
LB[oc:A]TR[jc][jd])

(;B[qc];W[pg]C['A' is correct, 'B' leads to a disaster.]LB[qg:B][of:A]
(;B[of];W[qg]C['A' and 'B' both lead to results which favor Black.]
LB[qe:B][oc:A]
(;B[oc])

(;B[qe];W[oc];B[qb];W[re];B[rd];W[nf];B[og];W[ph];B[kd])
)

(;B[qg];W[pe];B[of];W[qd];B[od];W[oe];B[oc];W[nf];B[og];W[pb])
)
)

(;W[pe];B[oe];W[qe];B[od];W[pg];B[of];W[qg];B[qd])
)

(;B[qe];W[pf];B[oe]C['A', 'B' or 'C'. 'D' is a mistake.]
LB[re:D][pe:C][qc:B][ph:A]
(;W[ph];B[qi];W[qc];B[pc];W[re];B[qd];W[rd];B[rc];W[nf];B[ne];W[me];
B[of];W[og];B[qb];W[mf])

(;W[qc];B[pc];W[re];B[qd];W[rd];B[rc];W[nf]
C['A' is correct, 'B' is a mistake.]LB[of:B][qb:A]
(;B[qb];W[of];B[ne];W[me];B[mf];W[le];B[mg];W[ob]
C['A' is correct, any other play like 'B' is a mistake.]LB[rg:B][pb:A]
(;B[pb];W[ph])

(;B[rg];W[rf];B[oh];W[od];B[pe];W[pb])
)

(;B[of];W[og];B[ng];W[qb];B[rb];W[pb];B[ob];W[od])
)

(;W[pe];B[od];W[qd];B[qc];W[re];B[rd])

(;W[re];B[rd];W[pe];B[qd];W[od]
C[White may want to play A instead of the marked exchange later.
Having lost this option is a disadvantage.]
LB[rf:A]TR[rd][re];B[ne];W[md];B[me];W[og];B[le];W[kc];B[jd];W[pc];
B[rf];W[rg];B[se];W[qg];B[pb]
C[This move, forcing White into a small position and bad shape
on top, would be impossible without the triangled present, White
gave before. 'A' is now necessary, 'B' just makes the mistake
bigger.]
LB[qc:B][oc:A]TR[rd]
(;W[oc];B[qc];W[jc];B[ld];W[lc];B[ob];W[mc];B[id];W[qj])

(;W[qc];B[oc];W[rc];B[lc];W[nc];B[ob];W[nb];B[rb])
)
)

(;B[jd];W[qd];B[qc];W[pc];B[qe];W[rd];B[oc];W[pb];B[od])
)

(;W[nc]C['A *' is joseki, 'B' and 'C' are not recommended,
]
LB[pf:A][nd:B][oe:C]
(;B[pf]
C['A *' is joseki, 'B *' too but can be difficult.
'C' is disadvantageous.]
LB[pc:C][pg:B][qc:A]
(;W[qc]C['A *' is joseki. 'B *' can be unfavorable.]LB[pc:B][qd:A]
(;B[qd];W[pc];B[od]C['A *' or 'B'.
'C' is a mistake.]
LB[rd:C][oc:B][rc:A]
(;W[rc]C['A *' or tenuki 'B'.]LB[dp:B][rd:A]
(;B[rd]C[
* GOOD VARIATION *]PL[2];B[lc]
C[Later
'A' sente leaving aji, 'B' gote.]LB[nb:B][mc:A]
(;W[mc];B[ld]PL[2];B[sc]C[Later, Black can use the aji...];W[sb]
C[White must not answer here!];B[oc];W[ob];B[nb])

(;W[nb])
)

(;B[dp]C[Later, White can play on A.]LB[rd:A];W[rd];B[qg])
)

(;W[oc])

(;W[rd];B[rc]C['A' or 'B' give the same result.]LB[re:B][rb:A]
(;W[rb];B[oc];W[ob];B[nb];W[pb];B[mc];W[re])

(;W[re];B[oc];W[ob];B[nb];W[pb];B[mc];W[rb])
)
)

(;B[pc];W[qd]
C[Black 7 is especially good with an additional stone on the triangled
point.
'A *' is usual.
'B *' is complicated.]
PL[2]LB[pc:7][qe:B][pe:A]TR[jd]
(;B[pe]C[White 'A' is usual, 'B' is possible.]LB[pb:B][rf:A]
(;W[rf];B[pb];W[qb]
C['A' is correct, any other pincers like 'B' are not.]LB[jc:B][lc:A]
(;B[lc]C[Later, White 'A' is useless.]LB[pg:A];W[pg];B[qg];W[og];B[pj]
;W[mg];B[nf]C[Don't avoid this move!];W[ng]
C[Later, White 'A' or 'B' fail.]PL[2]LB[mc:B][ld:A]
(;W[ld];B[mc];W[md];B[nd])

(;W[mc];B[ld];W[ne];B[me]C['A' or 'B' don't capture.]LB[nd:B][mf:A]
(;W[mf];B[nd])

(;W[nd];B[of];W[mf];B[mb];W[nb];B[lb];W[pa];B[oa];W[qa];B[ob];W[na];
B[hd]
C[Seki, Black wall transferred to the left, White center group
heavy.])
)
)

(;B[jc];W[pg];B[qg];W[og];B[pj];W[ne])
)

(;W[pb];B[qe];W[ob])
)

(;B[qe];W[re];B[pe];W[rf]C[
'A *' or 'B'.]LB[pg:B][pb:A]
(;B[pb]
C['A', 'B' or 'C *'. 'C *' is basic joseki, but makes it easy for
Black.]
LB[qb:C][jd:B][qg:A]
(;W[qg];B[pg]C['A' or 'B'.]LB[jd:B][rh:A]
(;W[rh];B[qi];W[ri];B[qj]C['A' or 'B'.]LB[kd:B][jd:A]
(;W[jd])

(;W[kd])
)

(;W[jd]C['A' is correct, 'B' is not recommended.]LB[rb:B][rh:A]
(;B[rh];W[qb];B[pl])

(;B[rb];W[rh];B[qi];W[ri];B[qj];W[fc];B[rj];W[rc])
)
)

(;W[jd];B[rb];W[qg]C['A' or 'B'.]LB[ph:B][pg:A]
(;B[pg];W[rh];B[qi];W[ri];B[qj];W[rj];B[qk])

(;B[ph];W[rh];B[ri];W[rj];B[sh];W[sg];B[rg];W[pg];B[og];W[rh];B[si];
W[qi];B[rg];W[pi]C['A' is correct, 'B' is a mistake.]LB[rh:B][oh:A]
(;B[oh];W[rh];B[kd];W[sj];B[kc])

(;B[rh];W[oh];B[sf];W[sj];B[rd];W[sg])
)
)

(;W[qb];B[lc]C[
* GOOD VARIATION *])
)

(;B[pg];W[kc])
)
)
)

(;W[pg];B[qg]
C['A *' is joseki.
 'B is, an older joseki, take the corner in gote.
'C' is joseki.
]
LB[qc:B][pc:A][pe:C]
(;W[pc]
C['A *' is simple, but gives up the corner.
'B' takes huge outside influence.]
LB[qc:B][qe:A]
(;B[qe];W[qc]
C['A *' concludes the joseki, but is oftenly omitted for sente.
Then White can later followup on 'B'.]
PL[2]LB[rf:B][of:A]
(;B[of]C[
* GOOD VARIATION *])

(;W[rf]C[Later.];B[re];W[of];B[pe])
)

(;B[qc];W[pe];B[of];W[qd];B[od];W[oe];B[ne];W[qe];B[nd];W[nf];B[og];
W[oc]C['A' and 'B' give the same result.]LB[ld:B][mc:A]
(;B[mc];W[mb];B[ld];W[rc];B[qb];W[rb];B[lb];W[nb];B[oh];W[mf];B[kd])

(;B[ld]
C['A' is correct. 'B' is too early, fails to create some aji on
the top side.]
LB[rc:B][lc:A]
(;W[lc]C['A' is usual, 'B' complicated.
'C' is a mistake.]
LB[rc:C][rf:B][mc:A]
(;B[mc];W[mb];B[md];W[rc];B[qb];W[rb];B[rf];W[re];B[se];W[rd];B[lb];
W[na]
C[With a position in the top left corner, Black takes on 'A', in
the lower right corner, on 'B'.]
LB[ph:B][kc:A]
(;B[kc];W[ph])

(;B[ph];W[kc])
)

(;B[rf];W[rc];B[qb];W[re];B[se];W[rd];B[rb];W[rg];B[mc];W[mb];B[md];
W[lb]C['A' or 'B'.]LB[ng:B][sg:A]
(;B[sg];W[sf];B[nb];W[ob];B[rf];W[rh];B[sc];W[sf];B[oa];W[oh];B[ng];
W[qi];B[pb];W[hc])

(;B[ng];W[rh];B[kc];W[jc]C['A' is better than 'B'.]LB[kb:B][kd:A]
(;B[kd];W[kb];B[sf];W[qi];B[ph];W[sg];B[ri];W[sd];B[qj];W[sf];B[pi])

(;B[kb];W[kd];B[jb];W[mf];B[le];W[ke];B[lf];W[kf];B[lg];W[ic];B[nb];
W[ob];B[oa];W[na];B[pa];W[ib];B[pb];W[qi];B[ph];W[rj])
)
)

(;B[rc];W[le];B[mf];W[ng];B[oh];W[me];B[md];W[kd])
)

(;W[rc];B[qb];W[rb];B[rf];W[re];B[se];W[rd];B[mc];W[mb];B[lb];W[na];
B[oh])
)
)
)

(;W[qc];B[pc];W[pe];B[of];W[oe];B[qe];W[qd];B[rf]
C['A' is enough, 'B' risks a ko.]LB[re:B][od:A]
(;W[od])

(;W[re];B[qf];W[od];B[pb];W[qb];B[ne];W[lc];B[rd];W[rc];B[se]
C['A' is necessary, tenuki 'B' is a mistake.]LB[dp:B][oc:A]
(;W[oc])

(;W[dp];B[ra])
)
)

(;W[pe];B[of]LB[oe:A][qd:B]C['A' or 'B' are joseki.
]
(;W[oe];B[qe];W[qd];B[rf];W[od];B[pc];W[qc])

(;W[qd];B[oe];W[qe];B[oc];W[qc];B[nb];W[pb]C[Later sente
])
)
)

(;W[pc];B[qc]C['A' or 'B'.]LB[pg:B][qd:A]
(;W[qd];B[qe];W[rd]
(;B[re];W[od];B[pe];W[rc];B[qb];W[rb];B[pb];W[oc])

(;B[oc];W[pb];B[od]C['A' takes the top side, 'B' the right side.]
LB[re:B][ob:A]
(;W[ob];B[re];W[rc];B[lc])

(;W[re];B[ob]C['A' or 'B']LB[pe:B][qb:A]
(;W[qb];B[qg];W[pe];B[oe])

(;W[pe];B[oe]C['A' or 'B'.]LB[pg:B][qb:A]
(;W[qb];B[pg])

(;W[pg];B[of];W[qg];B[qb];W[ph])
)
)
)
)

(;W[pg];B[oc]C[No good follow-up for White.])
)
)

(;B[nd]C['A' punsihes, 'B' fails.
]LB[md:A][qc:B]
(;W[md];B[ne]C['A' is the correct punishment, 'B' and 'C' are not.
]
LB[pc:A][oc:B][qc:C]
(;W[pc];B[oc];W[ob];B[od];W[mb];B[qc];W[pb];B[me];W[ld]PL[2];W[qd]
C[Later
];B[qe];W[rd];B[re];W[rc]C[Black overconcentrated
])

(;W[oc];B[pc]C['A' is possible, 'B' is a severe mistake.]
LB[od:B][pg:A]
(;W[pg];B[ph];W[og];B[od]C[Good for Black.])

(;W[od];B[oe];W[pe];B[rd];W[pb];B[qb];W[ob];B[me];W[ld];B[pf];W[qe];
B[qg])
)

(;W[qc];B[oc];W[qd];B[mc]
C[The result isn't equal because of the Black aji on A.]LB[re:A])
)

(;W[qc];B[qd];W[pc];B[oc];W[ob];B[od];W[mc];B[nb];W[pb];B[lc]
C['A' is correct, 'B' is a mistake.]LB[md:B][mb:A]
(;W[mb];B[md]C[
])

(;W[md];B[mb];W[me];B[rd]
C[White dies in the corner and is hunted outside.])
)
)

(;B[oe];W[qc];B[qd];W[pc];B[pg]LB[qh:3][oe:5]
C[Black 3 is overconcentrated now, so Black 5 was wrong.
])
)

(;W[ph]C[Black continues with 'a *' or 'b'.
]LB[qi:b][pi:a]
(;B[pi]C[White continues with 'a *' or 'b'.]LB[oh:b][pg:a]
(;W[pg]
C['A *' is joseki, 'B *' and 'C' are possible, 'D' aims for a huge
influence, but gives too much territory..
'E' if Black is in the lower right.]
PL[2]LB[re:E][oi:D][qe:C][nd:B][qj:A]
(;B[qj];W[nd]C['A *' or 'B'.]LB[ne:B][rd:A]
(;B[rd]C['A *' is joseki, tenuki 'B' is wrong.]LB[dp:B][rh:A]
(;W[rh]C[White forestall the connection.];B[nc];W[mc];B[oc];W[md];
B[ni]C[
* GOOD VARIATION *])

(;W[dp];B[rf];W[rg];B[qg];W[rh];B[qi];W[re];B[qe];W[sf];B[pf])
)

(;B[ne]C['A' is correct, 'B' is not good.]LB[me:B][qc:A]
(;W[qc];B[qd]C['A' is correct, 'B' is a trick play.]LB[od:B][pc:A]
(;W[pc];B[od];W[oc];B[md];W[nc];B[of])

(;W[od]C['A' is correct, 'B' is being tricked.]LB[oe:B][pc:A]
(;B[pc];W[oe];B[nb])

(;B[oe];W[pc];B[pe];W[md])
)
)

(;W[me];B[oe];W[qc];B[qd];W[pc];B[od];W[oc];B[md];W[nc];B[ld];W[mf];
B[og]C[The fight is good for Black.])
)
)

(;B[nd]C[
* GOOD VARIATION *];W[qi];B[qj];W[ri];B[pj];W[rh]
C['A' or 'B'.]LB[qn:B][qe:A]
(;B[qe])

(;B[qn])
)

(;B[qe];W[qi];B[qj];W[ri];B[pj];W[rh]
C[If A is sente, Black plays A first before continuing the joseki.]
LB[qn:A];B[rf];W[rg];B[pf])

(;B[oi]
C[Black 7 is a mistake, because it misses all points of the correct
variations of which to take one is necessary.]
;W[nd]
C[Black 7 is questionable, because Black cannot threaten to connect
on A like in the joseki.]
LB[oi:7][rd:A];B[ne];W[qc]
C[White 10 is nice timing. Black continues with 'A'. In this position
'B' and 'C' are mistakes.]
LB[qd:C][pc:B][md:A]
(;B[md]C['A' is better than 'B'.]LB[pc:B][nc:A]
(;W[nc];B[mc];W[pc];B[od];W[oc];B[of];W[qd];B[mi]
C[Now Black 7 makes some sense as part of Black's influence.
Still it was a mistake, as White has much territory and sente,
while the two squared Black stones have zero effect.]
LB[oi:7]MA[od][pd])

(;W[pc];B[od]C['A' or 'B'.]LB[qd:B][nc:A]
(;W[nc];B[oc];W[qd];B[nb])

(;W[qd];B[nc])
)
)

(;B[pc];W[qd];B[pe]
C[White continues with 'A'. White 'B' is an overplay.]LB[qi:B][qb:A]
(;W[qb];B[me];W[pb]
C[Black 7 would be better on A now. Now it is neither connecting
the two Black groups nor protecting the cut.]
LB[oi:7][qj:A])

(;W[qi]C[White 14 is an overplay.];B[qe];W[re];B[rd];W[rc];B[rf];W[sd]
;B[rg];W[me];B[oh]C['A' is correct, 'B' is a mistake.]LB[qj:B][kc:A]
(;W[kc]C[White settles his top stones.];B[qj];W[ri];B[rj]
C[End of sequence.];W[rh]C[White cannot capture the Black stones.];
B[qg];W[sg];B[pf];W[sf];B[og])

(;W[qj];B[qg];W[kc];B[ql])
)
)

(;B[qd];W[od];B[pc];W[oe];B[nb];W[mc]
C[Black 7 would be better on A now.]LB[oi:7][qj:A])
)

(;B[re];W[qi];B[qj];W[ri]PL[1]LB[rj:A][rf:B]
C['A' is correct, 'B' is disadvantageous..
]
(;B[rj];W[rh];B[rf];W[rg];B[oi])

(;B[rf];W[rg];B[rj];W[oi];B[pj];W[ne];B[oc];W[pe];B[qe];W[od];B[pc];
W[md];B[of];W[nf])
)
)

(;W[oh]C['A' or 'B'.]LB[qi:B][qg:A]
(;B[qg];W[pf]
C[Black continues with 'a' to 'c'.
'd' is questionable.
Black 'c' and 'd' are territory oriented.]
LB[nc:d][rd:c][md:b][nd:a]
(;B[nd];W[oe]
C[White 10 protects against the cut.

Black continues with 'a' or 'b'.]
LB[qc:b][od:a]
(;B[od]
(;W[rf]C[White later aims at the cut of 'a' or invasion of 'b'.]
LB[qc:b][qi:a])

(;W[pk];B[oi];W[ni];B[oj])
)

(;B[qc]C[Black 11 protects against later invasion.];W[pk];B[oi];W[ni];
B[oj]C[Black 13 is a suji for getting access to the center.];W[mh])
)

(;B[md];W[rf];B[qk];W[qc];B[pc];W[qd];B[qb];W[rb];B[qn])

(;B[rd];W[rf];B[qj];W[od];B[pc];W[oe];B[nb])

(;B[nc];W[qd];B[qc];W[od];B[oc];W[pe];B[pc];W[pk]
C[White makes good shape for himself and weakens the Black stones
on the right very much.])
)

(;B[qi];W[oe]
C['A' or, with an additional stone on the triangled position, 'B'.]
LB[od:B][nc:A]TR[jd]
(;B[nc];W[qm]C[The stone has support on or near A.]LB[pp:A];B[oi];
W[nh];B[mj];W[lh]C[Result: fight.])

(;AB[jd];B[od];W[ne];B[mc];W[oi])
)
)
)

(;B[qi]
C[Black plays 5 with support down the right side.

White continues with 'a' or 'b'.]
LB[nd:b][of:a]
(;W[of]
C[This variation is from Cho Chikun vs. Yoda Norimoto, 1999 Meijin
title game 1.]
;B[nd];W[pi];B[pj]C['A' is correct, 'B' is complicated.]LB[qj:B][qg:A]
(;W[qg];B[qk];W[rd];B[qc])

(;W[qj];B[rj]AB[qn]
C[For Black 11 to make sense, Black must have support such as shown.];
W[qk];B[rk];W[ql];B[oj];W[ni];B[rl];W[nj];B[pl];W[qc];B[qd];W[rd];
B[pc];W[rb];B[qb];W[rc];B[kc])
)

(;W[nd]
C[White 6 looks a bit inconsistent, a seeming change of direction
toward the top from the emphasis on the right of White 4.

This variation is from Wang Lei vs. Zhou Heyang, 1996 All Chinese
Championship.]
;B[pf];W[pg];B[of];W[qg];B[qe];W[pi];B[qj];W[pj];B[qk];W[mi];B[me];
W[kc];B[ke];W[ki];B[mc];W[hc])
)
)

(;W[of]
C[
'A' and 'B *' are joseki. 'C' and 'D' are mistakes.
'E' is not recommended.]
LB[pg:E][qe:D][qk:C][nc:B][nd:A]
(;B[nd]
C['A' is the usual joseki.
To avoid complications, Guo Juan 5P will just play 'B'.
'C' is questionable.
'D' is not recommended.
'E' is a mistake.
]
LB[nd:5][pi:A][qc:B][oh:C][pk:D][qj:E]
(;W[pi]
C[The sequence from White 6 on is similar, but not the same as
with the one-space pincer in conjunction with the 3-4 stone:
'A' is joseki if there's a White stone on the squared point, hoshi in the lower right corner, or no White stone in that corner. In this case, 'B' is not recommended.
But, if there's a White stone on the circled point, komoku in the lower right corner, 'A' is disadvantageous, and 'B' is the correct choice.
'C' and 'D' are inferior.

If Black 5 would be on the triangled stone, 'A' would be wrong
and 'C' correct.
]
LB[nd:5][qj:D][qe:C][qi:B][ph:A]TR[nc]MA[pp]CR[qp]
(;B[ph];W[oh]
C['A' is the usual joseki, 'B' punishes if Black has the ladder.
]
LB[oi:B][qi:A]
(;B[qi];W[pj];B[qj];W[pk];B[ql]
C['A' is usual and necessary.
If the choice of the variation is correct whole-board-strategy
and White wants to create a big wall, he must play 'B'.
Connecting on 'C' is too slow and unnecessary.]
LB[og:C][pl:B][om:A][of:4]TR[qp]
(;W[om]
C['A' is a usual answer to the White stone.
The cut on 'B' is possible.
After the tenuki 'C' White attacks the top right corner. 
'D' is a mistake.]
LB[qn:D][dp:C][og:B][qm:A]
(;B[qm]C[Cutting at 'A' or 'B' doesn't do harm.]PL[2]LB[pg:B][og:A]
(;B[nh]C[Later, Black can undo White's influence.];W[og];B[ni];W[oi];
B[nl];W[ol])

(;B[og];W[ng];B[pg];W[nh];B[pf];W[qc]C['A' or 'B' don't kill.]
LB[pc:B][qd:A]
(;B[qd];W[pb];B[nb];W[rd];B[re];W[rb];B[sd];W[rc]
C['A' threatens the corner, 'B' tries to kill, but just pushes
White out.]
LB[qa:B][me:A]
(;B[me]C[White lives on 'A' or Black kills on 'B'.]PL[2]LB[qa:B][ob:A]
(;W[ob])

(;B[qa];W[ra];B[pa];W[ob];B[oa];W[nc];B[mc];W[oc];B[mb];W[od];B[oe])
)

(;B[qa];W[ra];B[pa];W[ob];B[oa];W[nc];B[mc];W[oc];B[lb];W[od];B[oe];
W[ne];B[nf];W[md])
)

(;B[pc];W[rb];B[rd];W[qd];B[re];W[pb];B[ob];W[qe];B[rf];W[pe];B[oe];
W[oc];B[od];W[nc];B[mc];W[nb];B[mb];W[oa])
)

(;B[pg];W[og];B[pf];W[qc]
(;B[qd];W[rd];B[re];W[rc];B[qe];W[ob])

(;B[pc];W[rb])
)
)

(;B[og];W[ng];B[pg]C[White can live on 'A'.]LB[qc:A])

(;B[dp]
C[White starts to do something on the top site with 'A' or threatens
the right group on 'B' or strengthens his wall on 'C' depending
on the fuseki.]
LB[qm:C][og:B][oc:A]
(;W[oc];B[od]C['A' aims for territory, 'B' for sente.]LB[mf:B][og:A]
(;W[og];B[qn];W[lc]C['A' is correct, 'B' is wrong.]LB[nc:B][me:A]
(;B[me]C['A' and 'B' are correct.]LB[nc:B][jd:A]
(;W[jd];B[nc];W[fc])

(;W[nc];B[pc];W[ic])
)

(;B[nc];W[le];B[rd];W[fc]
C[As Black had to secure the corner in gote, White can play an
extension on the top. White is better.])
)

(;W[mf]C['A' is correct, 'B' is a mistake.]LB[qn:B][ld:A]
(;B[ld];W[qn];B[rm])

(;B[qn];W[ld];B[nc];W[lb];B[ng];W[nf];B[qe])
)
)

(;W[og]C['A' is correct. Tenuki 'B' again is wrong.]LB[dd:B][qn:A]
(;B[qn];W[lc];B[me];W[jd];B[ld]C['A' and 'B' are correct.]
LB[kd:B][mc:A]
(;W[mc];B[nc];W[kd];B[qd];W[fc])

(;W[kd];B[mc];W[le];B[lf];W[md]C['A' is correct, 'B' is wrong.]
LB[mf:B][ne:A]
(;B[ne];W[mb];B[ld];W[qk];B[rk];W[md];B[nc];W[kb];B[mg];W[mi])

(;B[mf];W[nc];B[ld];W[qk];B[rk];W[md];B[mb])
)
)

(;B[dd];W[qn];B[rm];W[rn];B[qk];W[rf];B[rg]
C[Good for White, who can still invade on A.]LB[qc:A])
)

(;W[qm];B[pl];W[ol];B[qk];W[ni];B[pm];W[pn];B[rn])
)

(;B[qn];W[pl];B[qm]
C[Black can no longer undo White's influence starting on A, because
White removed a threat to cut in sente.]
LB[nh:A])
)

(;AW[qp]C['A' or 'B' are ok.]LB[om:B][pl:A]
(;W[pl];B[qm];W[pm];B[qn];W[pn]C[White weakness on A.
]LB[og:A];B[rp];
W[rq];B[ro];W[pq])

(;W[om];B[qm];W[op];B[jq])
)

(;W[og]C[Slow for White.])
)

(;B[oi];W[qi]C['A' or 'B'.]LB[ri:B][og:A]
(;B[og];W[nh];B[pg];W[ng];B[pf];W[rh];B[nf];W[oj];B[oe];W[rg])

(;B[ri];W[rh];B[rg];W[qg];B[sh];W[pg];B[rh];W[qk];B[rj];W[ok])
)
)

(;AW[qp];B[qi];W[pj]LB[qj:A][ph:B]C['A' is right, 'B' is wrong.
]
(;B[qj];W[pk];B[ql];W[pl];B[qm];W[pm];B[qn];W[pn];B[qo];W[po];B[pp]
LB[ph:A]C[This is possible only because Black hasn't pushed on A.
];
W[qq];B[pq];W[pr];B[or];W[qr];B[np];W[ro];B[rn];W[rp]PL[2];W[qk]
C[Later, White can spoil Black's shape ...
];B[rk];W[rg];B[rh];W[sm];
B[rl];W[sn];B[og]C[... but Black can still go out.
];W[pg]
C[Whtie can't cut and kill.
];B[ph];W[oh];B[qg])

(;B[ph];W[oh];B[qj];W[pk];B[ql];W[pl];B[qm];W[pm];B[qn];W[pn]
LB[rp:A][qo:B]C[Black must play 'A' and cannout cut on 'B'.
]
(;B[rp];W[rq];B[ro];W[pq])

(;B[qo];W[po];B[pp];W[qq];B[pq];W[pr];B[or];W[qr];B[np];W[ro];B[rn];
W[rp]PL[2]LB[qk:A][ph:9]
C[Black lives or White kills on 'A'. Black 9 has damaged the escape route.
]
(;B[qk])

(;W[qk];B[rk];W[rg]LB[sl:A][rh:B]C['A' or 'B' -> White kills.
]
(;B[sl];W[sj])

(;B[rh];W[sm]LB[rl:A][sn:B]C['A' or 'B' -> B dead.
]
(;B[rl];W[sn])

(;B[sn];W[rl])
)
)
)
)
)

(;B[qe]C['A' is correct. 'B' and 'C' are wrong.]LB[re:C][rf:B][qi:A]
(;W[qi];B[rf];W[qg];B[rg];W[rh]
C[Good for White because the Black corner ist still open.
Later, White 'A' is correct,
'B' and 'C' are not recommended.
White 'D' is a mistake.]
PL[2]LB[lc:D][rd:C][qc:B][oc:A]
(;W[oc]C['A', 'B' or 'C' don't save everything.]LB[nc:C][pc:B][od:A]
(;B[od];W[pc]C['A' or 'B' don't kill.]LB[qc:B][nc:A]
(;B[nc];W[rd];B[re];W[rb])

(;B[qc];W[qb];B[rc];W[mb])
)

(;B[pc]C['A' is correct, 'B' wrong.]LB[pe:B][re:A]
(;W[re]C['A' loses less than 'B'.]LB[rd:B][od:A]
(;B[od];W[rd])

(;B[rd];W[pe];B[qd];W[od])
)

(;W[pe];B[oe])
)

(;B[nc];W[re]C['A' loses less than 'B'.]LB[rd:B][od:A]
(;B[od];W[rd])

(;B[rd];W[pe];B[qd];W[od])
)
)

(;W[qc]C['A', 'B' or 'C' are possible. 
'D' is a mistake.]
LB[rd:D][ob:C][pb:B][pc:A]
(;B[pc];W[rd];B[re];W[rb];B[pb];W[qd]C['A' or 'B' don't kill.]
LB[sc:B][pe:A]
(;B[pe];W[sc])

(;B[sc];W[pe];B[sd];W[sb])
)

(;B[pb];W[oc]C['A' is better than 'B'.]LB[pc:B][od:A]
(;B[od];W[pc]C['A' is better than 'B'.]LB[rd:B][nc:A]
(;B[nc];W[rd];B[re];W[nb];B[mb];W[ob];B[lc];W[rb])

(;B[rd];W[nc];B[md];W[mc];B[ld];W[kc])
)

(;B[pc];W[od];B[oe];W[ne];B[pe];W[md];B[nc];W[mc];B[nf];W[nb]
C['A' is correct, 'B' is wrong.]LB[pf:B][og:A]
(;B[og];W[ph];B[pf])

(;B[pf]C['A' is correct, 'B' is wrong.]LB[ph:B][og:A]
(;W[og];B[pg];W[oh])

(;W[ph];B[og])
)
)
)

(;B[ob];W[pb];B[rb];W[oc]
C['A' keeps the corner, 'B' emphasizes the top side.]LB[od:B][pc:A]
(;B[pc];W[nb];B[qb];W[oa];B[od];W[lc])

(;B[od];W[nb];B[mb];W[oa];B[mc];W[rc];B[pc];W[qb];B[nc];W[ob];B[rd];
W[sb];B[ra];W[qa])
)

(;B[rd];W[oc];B[od];W[nb])
)

(;W[rd]C['A' is correct, 'B' is wrong.]LB[re:B][rc:A]
(;B[rc]C['A' or 'B'.]LB[qc:B][re:A]
(;W[re];B[qd];W[sg];B[sd];W[sf])

(;W[qc];B[rb]C['A' is correct, 'B' fails.]LB[qd:B][re:A]
(;W[re];B[qd];W[sg])

(;W[qd];B[re];W[qb];B[pc];W[pe];B[pb])
)
)

(;B[re]C['A' or 'B' are ok.]LB[qc:B][oc:A]
(;W[oc];B[od]
(;W[qc];B[pc];W[pb];B[ob]
(;W[rb];B[pa]
(;W[sc];B[qb];W[qd];B[ra]
(;W[pe];B[se];W[sd];B[sb];W[sa])

(;W[sb];B[se];W[sd];B[qa];W[pe];B[sa];W[sg];B[rc])
)

(;W[qb];B[qa];W[sc];B[ra])
)

(;W[qd]
(;B[qb];W[rb];B[pa];W[pe]
(;B[sd];W[rc];B[sc];W[sb];B[se];W[sg];B[ra];W[sf])

(;B[ra];W[se];B[sb];W[sg];B[rc];W[sf])
)

(;B[pe];W[rb];B[sc];W[sd];B[pa];W[qa];B[qb])
)
)

(;W[pc]
(;B[qc];W[qb]
(;B[rb];W[rc];B[qd];W[sb];B[ra];W[qa];B[pb];W[sa];B[ob];W[sd])

(;B[rc];W[mc])
)

(;B[nc]
(;W[qb];B[rc];W[rb]
(;B[qd];W[nb];B[mb];W[ob];B[sb];W[pa])

(;B[ob];W[qc];B[sc];W[sd];B[qa];W[pb];B[pa];W[nb])
)

(;W[qc];B[rb];W[qd];B[pe];W[qb];B[ob];W[ra];B[sb])
)
)

(;W[pc];B[qc];W[qb])
)

(;W[qc]C['A', 'B' or 'C'.]LB[ob:C][pb:B][pc:A]
(;B[pc];W[rb];B[pb];W[qd]C['A' or 'B' don't kill.]LB[sc:B][pe:A]
(;B[pe];W[sc])

(;B[sc];W[pe];B[sd];W[sb])
)

(;B[pb];W[oc]C['A' is correct, 'B' is wrong.]LB[od:B][pc:A]
(;B[pc];W[od];B[oe];W[ne];B[pe];W[md];B[nf];W[nc]
(;B[ph];W[oh]
(;B[pg];W[og];B[pf])

(;B[og];W[pg];B[pf])
)

(;B[og];W[ph];B[pf])
)

(;B[od];W[pc];B[nc];W[ob];B[rb];W[qb]C['A' is less bad than 'B'.]
LB[rc:B][qd:A]
(;B[qd];W[rc])

(;B[rc];W[qd];B[sd];W[pe];B[nb];W[se];B[sf];W[sh]
C['A' or 'B' don't help.]LB[oa:B][sc:A]
(;B[sc];W[sg];B[se];W[ra])

(;B[oa];W[pa];B[na];W[sg];B[se];W[sc])
)
)
)

(;B[ob];W[pb]C['A' is better than 'B'.]LB[pc:B][rb:A]
(;B[rb];W[oc];B[pc];W[nb];B[qb];W[oa];B[od];W[lc])

(;B[pc];W[rb];B[pa];W[qb];B[sc];W[sd];B[qa];W[ra];B[sb];W[oa];B[pa];
W[oc];B[nb];W[pe]C['A' or 'B' don't kill.]LB[qd:B][od:A]
(;B[qd];W[od];B[se];W[rc];B[na];W[sg])

(;B[od];W[qd])
)
)
)
)
)

(;W[lc];B[me]
(;W[oc];B[nc]
(;W[rd];B[rc])

(;W[qc];B[rd];W[pc];B[nb])
)

(;W[qc];B[rd];W[oc];B[nc])
)
)

(;W[rf];B[ph];W[oh];B[qi]
C['A' is usual, 'B' was played by Kitani Minoru.]LB[oi:B][pj:A]
(;W[pj];B[qj];W[pk];B[ql]
C[White wants to connect on 'A' and push down on 'B' at once, so
White 8 was wrong..]
LB[rf:8][om:B][og:A]
(;W[og];B[pl];W[ol];B[pn])

(;W[om];B[og];W[ng];B[pg];W[pf];B[nf];W[ne];B[mf];W[od];B[oc];W[oe];
B[md];W[qk];B[rk];W[rj];B[ri];W[rl];B[sj];W[qm];B[rg];W[qd];B[qc];
W[rd];B[rc])
)

(;W[oi];B[pj];W[mf]C['A' is correct, 'B' is a mistake.]LB[ld:B][me:A]
(;B[me]C['A' is correct, 'B' is a mistake.]LB[lf:B][oc:A]
(;W[oc];B[od];W[qc];B[pc];W[pb];B[ob];W[qb]
C['A' is correct, 'B' is questionable.]LB[nc:B][re:A]
(;B[re];W[nc];B[mc];W[nb];B[mb];W[oa];B[lf];W[pg];B[oj];W[lg]
C['A' or 'B' are possible.]LB[mj:B][mg:A]
(;B[mg];W[mh];B[nf];W[ng];B[mf];W[mj])

(;B[mj];W[mh];B[kf];W[kg])
)

(;B[nc];W[re])
)

(;W[lf];B[ng];W[nf];B[pg])
)

(;B[ld];W[pl])
)
)

(;W[re];B[rd];W[pe];B[qd];W[qi];B[rg];W[rf];B[ri];W[rj];B[ph];W[oh];
B[qj];W[si];B[rh];W[rk];B[oi];W[pj];B[oj];W[pk];B[og];W[nh];B[pg];
W[ng];B[pf];W[oe];B[sf];W[nk];B[nf];W[ne];B[me];W[mf];B[od];W[nf];
B[le])
)

(;B[qj];W[qi];B[ri];W[ph];B[rh];W[pj];B[qk];W[pk];B[ql];W[om];B[pg]
C[This is bad.];W[og];B[pf];W[pe];B[qg];W[oe];B[qe];W[qd];B[rf];W[re];
B[qf];W[od];B[pc];W[oc];B[pb];W[ob];B[qc];W[gd])
)

(;W[qc];B[qd];W[rd];B[re];W[rc];B[qe];W[ob])

(;W[oh];B[qe];W[rf];B[qj];W[mf]C[White got not much.])

(;W[pk];B[oh];W[mf];B[rd])

(;W[qj]C['A' is easy, 'B' is also possible, but complicated.]
LB[pg:B][oh:A]
(;B[oh];W[rh]C[White can't connect ...];B[pg]
C[... because of this sente move.
'A' or 'B' don't give a good result.]
LB[qg:B][pf:A]
(;W[pf];B[ri])

(;W[qg];B[pf];W[qe];B[pe])
)

(;B[pg];W[pf];B[ng];W[rh];B[ri];W[qi];B[rg];W[ph];B[qg];W[og];B[oh];
W[pi]C['A' is correct, 'B' is wrong.]LB[sh:B][rf:A]
(;B[rf];W[nh];B[oi];W[mh];B[oj];W[mf];B[qk];W[rj];B[sh];W[rk];B[ql];
W[rl];B[qm];W[rm];B[qn])

(;B[sh];W[rf];B[rj];W[qk];B[nf];W[rk];B[sj];W[sf];B[sg];W[qc])
)
)
)

(;B[nc];W[pi]
C['A *' is joseki. 'B' is wrong.
If Black 5 would be on the triangled point instead, 'A' would
be wrong and 'B' correct.]
LB[nc:5][ph:B][qe:A]TR[nd]
(;B[qe]C['A *' is joseki, 'B' depends on a ladder.]LB[rf:B][qi:A]
(;W[qi];B[rf];W[qg];B[rg];W[rh]
C[
* GOOD VARIATION *

Later, White plays 'A' threatening to capture two stones on B.
Playing 'B' immediately is too early.]
PL[2]LB[rd:B][ph:A]
(;W[ph]C[Black can tenuki ...]PL[2];W[rd]
C[... and White captures two stones. 'A' is correct, 'B' is wrong.]
LB[re:B][rc:A]
(;B[rc]C['A' or 'B' are ok.]LB[qc:B][re:A]
(;W[re];B[qd];W[sg];B[sd];W[sf])

(;W[qc];B[rb]C['A' is correct, 'B' is wrong.]LB[qd:B][re:A]
(;W[re];B[qd];W[sf];B[sd];W[sg])

(;W[qd];B[re];W[pe];B[pc];W[qb];B[sd])
)
)

(;B[re];W[qc]C['A' or 'B' don't kill.]LB[pb:B][ob:A]
(;B[ob];W[pc];B[oc];W[rb];B[sc];W[od];B[oe];W[nd];B[ne];W[md];B[lc];
W[sd];B[qa];W[ld];B[kc]C['A' is correct, 'B' is wrong.]LB[nf:B][mf:A]
(;W[mf];B[me];W[ra];B[sb];W[le];B[nf];W[ng];B[pe];W[lg];B[pb];W[pf];
B[qb];W[sg];B[qd];W[rc];B[se];W[sf])

(;W[nf];B[me];W[lf];B[le];W[ke];B[kd])
)

(;B[pb];W[pc];B[oc];W[rb];B[sc];W[sd];B[qa];W[od];B[oe];W[nd];B[ne];
W[md];B[lc];W[ld];B[kc];W[mf];B[nf];W[ng];B[me];W[le];B[pe];W[lg];
B[ra];W[sb];B[qb];W[sg];B[qd];W[rc];B[ob];W[sf];B[sa];W[pf])
)
)

(;W[rd]C[Later, this doesn't work.];B[re];W[qc]
C['A' or 'B' kill, 'C' fails.]LB[pc:C][pb:B][ob:A]
(;B[ob];W[pc]C['A' kills, 'B' fails.]LB[od:B][oc:A]
(;B[oc];W[rb];B[qa];W[od];B[oe];W[nd];B[ne];W[md];B[lc];W[ld];B[kc]
C['A' or 'B' don't save the corner.]LB[mf:B][nf:A]
(;W[nf];B[me]C['A' or 'B' don't save the corner.]LB[kd:B][lf:A]
(;W[lf];B[le];W[ke];B[kd])

(;W[kd];B[mf];W[mc];B[mb];W[jc];B[jb])
)

(;W[mf];B[nf];W[ng];B[og];W[pf];B[mg];W[nh];B[me];W[lf];B[le];W[ke];
B[pe]C['A' or 'B' don't save the corner.]LB[ph:B][kd:A]
(;W[kd];B[pg])

(;W[ph];B[kd])
)
)

(;B[od];W[oc]C['A' or 'B' don't kill.]LB[nb:B][nd:A]
(;B[nd];W[pb];B[nb];W[rb])

(;B[nb];W[nd];B[qd];W[rc];B[ra];W[oe];B[rb];W[pe];B[qb];W[sg];B[pb];
W[se];B[sc];W[sf])
)
)

(;B[pb];W[pc];B[oc];W[rb];B[sc];W[sd]C['A' kills, 'B' fails.]
LB[oe:B][qa:A]
(;B[qa];W[od];B[oe];W[nd];B[ne];W[md];B[lc];W[ld];B[kc]
C['A' or 'B' don't save the corner.]LB[nf:B][mf:A]
(;W[mf];B[nf];W[ng];B[og]C['A' or 'B' don't save the corner.]
LB[oh:B][pf:A]
(;W[pf];B[pe];W[ph];B[me];W[le];B[lf];W[mg];B[kf];W[ke];B[je];W[jf];
B[kd])

(;W[oh];B[pf];W[ph];B[me];W[le];B[lf])
)

(;W[nf];B[me];W[lf];B[le];W[ke];B[kd])
)

(;B[oe];W[qa]C['A' or 'B' don't kill.]LB[sb:B][ob:A]
(;B[ob];W[qb];B[sb];W[sa];B[ra];W[rc])

(;B[sb];W[qb];B[sa];W[ob];B[oa];W[nb];B[mb];W[pa])
)
)

(;B[pc];W[rb];B[pb]
C['A' is correct and gives life, 'B' is wrong and makes only a
ko.]
LB[sc:B][qd:A]
(;W[qd]C['A' or 'B' don't kill.]LB[sc:B][pe:A]
(;B[pe];W[sc])

(;B[sc];W[pe];B[sh];W[ri]C['A' or 'B' don't help.]LB[qb:B][sd:A]
(;B[sd];W[sb]C['A' or 'B' don't help.]LB[se:B][qb:A]
(;B[qb];W[rc];B[se];W[sg];B[sf];W[sg])

(;B[se];W[sg];B[sf];W[rc];B[sg];W[si])
)

(;B[qb];W[sd]C['A' or 'B' don't help.]LB[sb:B][se:A]
(;B[se];W[rc];B[ra];W[sb];B[qa];W[sg];B[sf];W[sg])

(;B[sb];W[se];B[ra];W[sg];B[rc];W[sf])
)
)
)

(;W[sc];B[qb];W[qd];B[ra];W[pe];B[sb];W[sa])
)
)
)

(;W[rf]
C[Black can play 'A' with the ladder or a ladder breaker like 'B'.]
LB[fq:B][ph:A]
(;B[ph];W[oh];B[oi]
C['A' starts the ladder. White cannot get a good result without
the ladder on 'B'.]
LB[qi:B][oj:A]
(;W[oj];B[ni];W[nh];B[pj];W[qi];B[qj];W[ri];B[rh];W[rj];B[rk];W[qk];
B[pk];W[mi];B[nj];W[ok];B[pl];W[nk])

(;W[qi]C['A' is correct, 'B' is a mistake.]LB[ri:B][og:A]
(;B[og];W[nh];B[pf];W[ng];B[pg];W[rh];B[oj]C[Good for Black.])

(;B[ri];W[rh]C[Neither 'A' nor 'B' help Black.]LB[og:B][rg:A]
(;B[rg];W[qg];B[sh];W[pg];B[rh];W[qk]C[White is successful.])

(;B[og];W[nh];B[pf];W[ng];B[pg];W[qg];B[pe];W[rj]C[Good for white.])
)
)
)

(;AW[dp];B[fq]
C[White can answer the ladder breaker with 'A' which is recommended
or capture Black 3 on 'B' what is wrong.]
LB[qh:3][qi:B][dn:A]
(;W[dn];B[ph];W[qi];B[oi];W[oj];B[oh];W[rh];B[nj];W[ok];B[nk];W[ol];
B[nl];W[om]C[Equal result.])

(;W[qi];B[cn]C[Black is better.])
)
)
)

(;B[ph];W[oh];B[qi];W[pj];B[qj];W[pk];B[ql];W[om]
C[Later White can press on A.]PL[2]LB[md:A];W[md];B[mc];W[ld]
C[White's influence is better than the Black territory.])
)

(;B[qk];W[nd];B[nc];W[mc];B[oc];W[md];B[rd];W[re];B[qc]
C[White is better.])

(;B[qe];W[rf];B[oh]
(;W[pe];B[od];W[qd];B[qc]
(;W[re];B[rc])

(;W[rd];B[oe];W[pf];B[nf];W[ng];B[mf];W[og];B[qk])
)

(;W[od];B[pf];W[pg];B[pe];W[oe];B[og];W[pc];B[re];W[qc];B[ph])
)

(;B[pg];W[pf];B[nd]C['A' is correct, 'B' is inferior.]LB[pi:B][pk:A]
(;W[pk])

(;W[pi];B[qi];W[pj];B[qj];W[pk];B[ql];W[om];B[qm]PL[2];B[ph];W[oh];
B[og];W[ng];B[nf];W[nh];B[mf])
)
)

(;W[dp]C['A' or 'B'.]LB[nc:B][pf:A]
(;B[pf];W[pe]
C['A' takes a lot of territory on the right, 'B' builds a wall
to the top.]
LB[oe:B][qe:A]
(;B[qe];W[oe];B[of];W[qd];B[re];W[ne];B[qc];W[nf];B[ng];W[mg];B[nh];
W[mh];B[ni];W[mi];B[nj])

(;B[oe];W[qe];B[pg];W[qd];B[pc];W[qc]
C['A' is correct, 'B' is questionable.]LB[pb:B][qb:A]
(;B[qb];W[rb];B[pb];W[rg];B[jd]C[Later, White wants to play A.]
LB[ne:A])

(;B[pb];W[qb];B[nf];W[jd])
)
)

(;B[nc]
C['A' makes a group, 'B' influence. 'C' is unfavorable, makes a
group too tightly enclosed.]
LB[qc:C][of:B][qd:A]
(;W[qd];B[qc];W[rc];B[qe];W[rd]
C['A' is correct, 'B' is only possible if there is an additional
stone on the right side.]
LB[re:B][pe:A]
(;B[pe]
C['A' makes a safe enclosed corner group, 'B' makes a group running
out.]
LB[re:B][pc:A]
(;W[pc];B[qb];W[pb];B[rb];W[sb];B[re];W[ra];B[pl])

(;W[re];B[qb];W[pf];B[rg];W[rf];B[qk];W[nf];B[qn])
)

(;B[re];W[pe];B[rf];W[pc];B[od];W[pb];B[og])
)

(;W[of];B[qd];W[pi];B[qi];W[pj];B[ph];W[oh];B[qj];W[pk];B[ql];W[om];
B[qn];W[og]
C[If Black can eliminate White's influence with his next move,
White 6 was a wrong choice.]
LB[of:6])

(;W[qc];B[qd];W[rd];B[re];W[rc];B[qe];W[ob];B[nb];W[oc];B[od];W[pc];
B[me])
)
)

(;W[qd];B[qc];W[rc]C['A' is correct, 'B' is disadvantageous.]
LB[pc:B][qe:A]
(;B[qe];W[rd];B[pe];W[pc]C['A' for the right, 'B' for the top side.]
LB[oc:B][qb:A]
(;B[qb];W[pb];B[rb];W[sb];B[re];W[ra])

(;B[oc]C['A' is correct, 'B' is a mistake.]LB[pb:B][qb:A]
(;W[qb];B[pb];W[re];B[pf];W[rf];B[jd])

(;W[pb];B[ob];W[qb];B[re])
)
)

(;B[pc];W[re];B[ld]C[Now, the triangled stone is alone.]TR[qh])
)
)

(;B[qi]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

Black 3, the two-space low pincer, at best indicates a special
strategy. 

The two-space low pincer is not as forceful as the one-space
pincer, nor as relaxed as the three-space pincer, which is most
often used as a dual purpose move to pincer and extend at the
same time. Neither fish nor fowl, the two-space low pincer is
less able to secure territory compared to the one-space pincer,
if the selected variation comes to that, and perhaps more likely
to later come under attack if White establishes a base for White
2.

White continues with 'a' to 'c'.

'd' continues on the right side against a Black komoku. In this branch is explained, when Black 3 is to be applied.

White 'e' and 'f' are not recommended.

e5, d4, c3, b2, a1
]
LB[of:c][nc:b][qc:a][qn:d][qd:e][pi:f]
(;W[qc]
C[White 4 is a natural choice.

Black continues with 'a' or 'b'.]
LB[pc:b][qd:a]
(;B[qd];W[pc]C[Black continues with 'a' or 'b'.]LB[rc:b][od:a]
(;B[od]C[White continues with 'a' or 'b'.]LB[oc:b][rd:a]
(;W[rd];B[re];W[rc];B[qe];W[nc];B[pf]
C[Black 3 does not contain White 2 as well as a one-space pincer
would (the marked spot).]
MA[qh])

(;W[oc];B[nd];W[mc];B[le])
)

(;B[rc];W[rb];B[rd];W[oc];B[od];W[nd];B[ne];W[md];B[me];W[ld];B[pg])
)

(;B[pc];W[qd];B[pe];W[qe];B[pf]
C[White continues with 'a', or begins an aggressive sequence with
'b'. White should have support in the lower right to play 'b'.]
LB[pg:b][qg:a]
(;W[qg];B[oh])

(;W[pg]
C[White should have support in the lower right to play this way.];
B[qg];W[og];B[rg];W[pb];B[ob];W[qb];B[nc];W[pl];B[oi];W[mg])
)
)

(;W[nc]C[Black continues with 'a' or 'b' or 'c'.
]LB[pf:b][nd:a][oe:c]
(;B[nd];W[md]C[Black continues with 'a' or 'b'.]LB[oc:b][ne:a]
(;B[ne]
C[White takes the corner with 'a', or builds thickness to the top
with 'b'.]
LB[oc:b][qc:a]
(;W[qc]C[White goes for the corner.];B[oc];W[qd];B[mc])

(;W[oc]C[White begins a sequence to build thickness.];B[pc];W[od];
B[pe];W[oe];B[pf];W[of];B[pg])
)

(;B[oc];W[ne];B[od];W[mc];B[pf];W[pg];B[of];W[pi];B[pj];W[oi];B[qh];
W[qg];B[rd])
)

(;B[pf]C[White continues with 'a' or 'b'.]LB[pg:b][qc:a]
(;W[qc]C[Black continues with 'a' or 'b'.]LB[qe:b][pc:a]
(;B[pc];W[qd];B[qe];W[re];B[pe];W[rf];B[ph];W[kc])

(;B[qe];W[pc];B[lc];W[mc];B[ld])
)

(;W[pg];B[qg];W[pe];B[of]
C[White continues with 'a'. White 'b' is unreasonable. White 'c'
likewise leads to a bad result for White.]
LB[oe:c][qh:b][qe:a]
(;W[qe];B[oe];W[rg];B[qh]C[White continues with 'a' or 'b'.]
(;W[qd];B[oc];W[qc];B[nd])

(;W[od];B[qd];W[rd];B[rc];W[re];B[qc];W[sf];B[ob];W[nb];B[sd];W[rh];
B[ri];W[sh];B[oc];W[nd];B[oh])
)

(;W[qh]C[White 10 is a mistake.];B[rg];W[rf];B[og];W[ph];B[rh];W[oe];
B[qe];W[re];B[qd];W[rd];B[od];W[ne];B[rc];W[pi];B[sd])

(;W[oe]C[White 10 is not recommended.];B[qe];W[rf];B[re];W[nf];B[og];
W[qd];B[rd];W[qc];B[rc];W[pc];B[ne];W[od];B[ng])
)

(;W[pe]
C[White 6 is not recommended.

Black continues with 'a' or 'b'.]
LB[qe:b][oe:a]
(;B[oe];W[qe];B[nd];W[oc];B[od];W[pg];B[of];W[pi];B[pj];W[oi];B[qh];
W[qg];B[mc];W[mb];B[lc];W[lb];B[kc];W[qb])

(;B[qe];W[oe];B[qd];W[pg];B[od];W[of];B[nd])
)
)

(;B[oe];W[qc];B[qd];W[pc];B[pg])
)

(;W[of];B[nd];W[oi];B[pk];W[lc];B[me];W[jd];B[qe];W[rf];B[re])

(;AB[pq];W[qn];B[qp];W[qk]LB[pi:A][qo:B][qk:6][qn:4][qi:3]
C[If Black had played 3 onto A instead, White could have continued White 6 onto B. Now he got only a more narrow group with 4.
])

(;W[qd]C[White 4 is not recommended.];B[qc];W[pc]
C[This cross-cut is a possible continuation.];B[od];W[oc];B[qe];W[rd];
B[qb]C[White has no good continuation.])

(;W[pi]
C[White 4 may lead to complications.

Black continues with 'a' or 'b'.]
LB[ph:b][pj:a]
(;B[pj];W[qh];B[qj]
C[White may switch directions by trying 'a' to 'c'.]
LB[md:c][nd:b][nc:a]
(;W[nc];B[nd];W[md]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[ne:b][oc:a]
(;B[oc];W[ne];B[od]
C[White continues with 'a'. White 'b' is not recommended.]
LB[nb:b][mc:a]
(;W[mc];B[re])

(;W[nb]
C[White 14 attempts to later infiltrate the corner, but this move
is not recommended.]
;B[me];W[ld];B[nf]C[White continues with 'a' or 'b'.]LB[le:b][oi:a]
(;W[oi];B[oj];W[ni];B[le];W[kd];B[pf];W[pg];B[qe])

(;W[le];B[oe];W[oi];B[oj];W[ni];B[lf];W[kf];B[lg];W[rd];B[rh];W[pg];
B[rg];W[rf];B[qc])
)
)

(;B[ne]
C[Black 11 is a mistake.

White continues with 'a'. White 'b' is an overplay. White 'c'
is likewise not recommended.]
LB[qc:c][pc:b][oc:a]
(;W[oc]C[Black may try 'a' or 'b'.]LB[qe:b][pc:a]
(;B[pc];W[rd];B[rh];W[pg];B[rg];W[rf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[od:b][pe:a]
(;B[pe];W[oi])

(;B[od]C[Black 19 is a mistake.];W[ld]
C[White 20 prepares for a sacrifice play.];B[qg];W[of];B[ph];W[oh];
B[oi];W[mf]C[Black cannot escape or live in the corner.])
)

(;B[qe]C[White continues with 'a'. White 'b' is too slow.]
LB[pf:b][pg:a]
(;W[pg];B[pf];W[of];B[pe];W[qb];B[og];W[oi];B[ng];W[mi]
C[White has the better position.])

(;W[pf]C[White 14 is too slow.];B[pe];W[qb];B[oi];W[ng];B[me];W[ld];
B[le];W[kd];B[nh])
)
)

(;W[pc]C[White 12 is unreasonable.];B[oc];W[ob];B[od];W[mb];B[qc];
W[oi];B[lc];W[mc];B[pb])

(;W[qc]
C[White 12 nullifies White 4: better to have invaded without playing
4.]
;B[oc];W[qd];B[mc])
)
)

(;W[nd];B[pf];W[pg];B[of];W[qe];B[od];W[rc];B[oi];W[og];B[mf];W[ng];
B[me];W[mg];B[qc];W[rb];B[lc])

(;W[md];B[oe];W[oi];B[qe];W[pf];B[oc];W[nc];B[ob])
)

(;B[ph];W[qh];B[qg];W[rh];B[oh]C[White continues with 'a' or 'b'.]
LB[rg:b][pg:a]
(;W[pg];B[og];W[rg];B[oe];W[pj];B[jc])

(;W[rg];B[pj];W[nc];B[oe];W[rd];B[oi];W[qc];B[pc])
)
)
)

(;B[qj]
C[
Sangen Basami = Sekan Hyeopgong = San Jia = 3-Space Low Pincer
---------------------------------------------------------------

White continues with 'a *', 'b', 'c *', 'd *' or 'e *'.

e5, d4, c3, b2, a1
]
LB[md:e][nd:d][nc:c][qd:b][qc:a]
(;W[qc]
C[Black continues with 'a *'. Black 'b' is out of the question.]
LB[pc:b][qd:a]
(;B[qd];W[pc]
C[Black continues with 'a *'. Black 'b' and 'c' are not recommended.]
LB[oc:c][rc:b][od:a]
(;B[od];W[rd];B[re];W[rc];B[qe];W[nc]
C[Black solidifies with 'a *'. 

Variation 'b' shows the consequence of playing elsewhere. 

Black 'c' builds a grand moyo, but sacrifices too much territory
doing so.]
LB[nd:c][dp:b][pf:a]
(;B[pf]C[
* GOOD VARIATION *];W[pg]
C[White attempts mischief. Black continues with 'a'. Black 'b'
is no good.]
LB[of:b][og:a]
(;B[og];W[of];B[nf];W[pe];B[oe]
C[White continues with 'a'. White 'b' is unreasonable.]LB[pf:b][pi:a]
(;W[pi])

(;W[pf];B[ph])
)

(;B[of]C[Black 15 is a mistake.];W[pi])
)

(;B[tt]C[Black plays elsewhere.];W[of];B[nd];W[mc];B[md];W[mf];B[ld];
W[kf])

(;B[nd]
C[Black attempts to build a great moyo, but gives away too much
territory.]
;W[mc];B[md];W[ld];B[le];W[kd];B[ke];W[jd])
)

(;B[rc]
C[Black 7 is not recommended, though may be reasonable with some
support at top.]
;W[rb];B[rd];W[oc];B[od];W[nd];B[ne];W[md];B[pg]
C[Black is reluctant to push at 'a', but it is a good point for
White later.]
LB[me:a];W[me])

(;B[oc]
C[Black 7 is a mistake. The punishment is the same as in the variation 
of Black 3 being on the squared point, look there for continuations.]
LB[qj:3]SQ[pi])
)

(;B[pc]C[Black 5 is a mistake.];W[qd];B[pe];W[qg]AB[jd]
C[Even with a stone at top as shown, Black should not play this
way.])
)

(;W[qd];B[qc];W[pc]C['A' or 'B'.]LB[oc:B][qb:A]
(;B[qb]C['A', 'B' or 'C'.]LB[oc:C][pb:B][rd:A]
(;W[rd];B[od];W[pb];B[ob];W[rb];B[pa];W[rc];B[oc])

(;W[pb];B[ob];W[oc];B[od];W[nc];B[qe])

(;W[oc];B[od];W[nd];B[oe];W[mc];B[qe])
)

(;B[oc];W[pb];B[qe];W[rd];B[od]
C[White continues with 'a'. White 'b' is not recommended.]
LB[rc:b][ob:a]
(;W[ob];B[re];W[rc];B[pf])

(;W[rc]C[White 12 is not recommended.];B[ob]
C[White continues with 'a'. White 'b' is a mistake.]LB[qb:b][pe:a]
(;W[pe];B[oe];W[pf];B[qb];W[rb];B[pa])

(;W[qb]
C[White 14 is not recommended. Black continues with 'a'. Black
'b' is a mistake.]
LB[re:b][pf:a]
(;B[pf];W[re];B[pg])

(;B[re]C[Black 15 is a mistake.];W[rf];B[pe];W[se]
C[White is not as well contained as the alternate variation.])
)
)
)
)

(;W[nc]
C[Black continues with 'a *' or 'b *'.

Black 'c' is a mistake in direction. 'd' is inferior.]
LB[qc:d][pf:c][oe:b][nd:a]
(;B[nd]C[Attaching on the side where there is no pincer is the rule.];
W[md]C[Black continues with 'a *' or 'b *'.]LB[oc:b][ne:a]
(;B[ne]
C[White continues with 'a *', 'b *' or 'c *'. 

White 'd' is not recommended.]
LB[pc:d][me:c][qc:b][oc:a]
(;W[oc]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[pf:b][pc:a]
(;B[pc]
C[White continues with 'a', 'b *' to 'd'. White 'e' is not recommended.

e5, d4, c3, b2, a1]
LB[od:e][pi:d][re:c][pg:b][jc:a]
(;W[jc];B[qe])

(;W[pg];B[qe]C[White continues with 'a *'. White 'b' is an overplay.]
LB[pe:b][re:a]
(;W[re]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[rd:b][pf:a]
(;B[pf];W[rf];B[rd]C['A *' is usual, 'B' is a trick play.]
LB[rc:B][ng:A]
(;W[ng]C[Black continues with 'a' or 'b *'.]LB[mf:b][pb:a]
(;B[pb])

(;B[mf];W[kc]
C[Black 'A *' is necesary. Playing elsewhere, such as 'B', is a
mistake.]
LB[oj:B][ob:A]
(;B[ob]C[
* GOOD VARIATION *])

(;B[oj]C[Black 19 is a mistake.];W[rc]C[White gouges out the corner.];
B[se];W[qc];B[qd];W[pb])
)
)

(;W[rc]
C[White 16 is an attempted trick play. Black continues wtih 'a'.
Black 'b' is a mistake.]
(;B[pb];W[sd];B[mc];W[lc];B[mb];W[ld])

(;B[se]C[Black 17 is a mistake.];W[sc];B[sd];W[qc];B[qd];W[pb])
)
)

(;B[rd]C[Black 13 is vulgar.];W[pe];B[qd];W[ng];B[od];W[kc])
)

(;W[pe]C[White 12 is an overplay.];B[re];W[ng];B[od];W[lc];B[me];W[kd]
;B[lf])
)

(;W[re]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[pf:b][pe:a]
(;B[pe];W[qh];B[kd];W[me];B[mf];W[le];B[rd];W[oh];B[ng];W[rc]
C[Continuation. White 20 does not work.];B[qe];W[rf];B[sd];W[qc];B[rb]
C[Black 25 prevents White from connecting underneath.];W[qb];B[pb])

(;B[pf];W[pe];B[oe];W[qe];B[od];W[kc];B[pg];W[qh];B[oi];W[rc]
C[White is sealed in, but there are gaps in Black's shape (aji).
A White success.])
)

(;W[pi]
C[White 10 is a tough move. White intends to lean on Black's pincer
stone, aiming to pushing through and cutting off Black 1 & 9.

Black continues with 'a' or 'b'.]
LB[qe:b][pj:a]
(;B[pj]C[White continues with 'a' or 'b'.]LB[oj:b][qi:a]
(;W[qi]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[oi:b][oj:a]
(;B[oj];W[re];B[pe];W[kc];B[oi];W[rc])

(;B[oi]C[Black 13 is not recommended.];W[oj]
C[Black continues with 'a' or 'b'.]LB[oh:b][ri:a]
(;B[ri];W[rh];B[rj];W[pg]
C[The push through now looms. The cut of White 14 is disagreeable
for Black.]
CR[od])

(;B[oh];W[rj];B[rk];W[ri])
)
)

(;W[oj]C[White 12 is a tough-minded move.];B[qi];W[ph];B[qe];W[ok];
B[qm]
C[Black aims to cut at 'a' and play the checking extension of 'b'.]
LB[kd:b][oi:a])
)

(;B[qe];W[pj];B[kd];W[me];B[mf];W[le];B[pf];W[qk]
C[Black continues with 'a' or 'b'.]LB[lc:b][lb:a]
(;B[lb]C[White continues with 'a' or 'b'.]LB[mb:b][mc:a]
(;W[mc];B[id])

(;W[mb];B[lc];W[mc])
)

(;B[lc]C[White obviously continues with 'a'. White 'b'?]LB[mb:b][mc:a]
(;W[mc])

(;W[mb]
C[Yoshio Ishida's Dictionary of Basic Joseki calls this a "well-timed"
sequence, but I don't see why.]
;B[mc];W[kc])
)
)
)

(;W[od]C[White 10 is not good.];B[pe];W[oe];B[pf];W[of]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[qg:b][pg:a]
(;B[pg])

(;B[qg]C[Black 15 is a mistake.];W[pg];B[ph];W[og];B[qh];W[pb];B[qb];
W[qc]C[Black must play 'a'. Black 'b' is a fatal mistake.]
LB[ob:b][qd:a]
(;B[qd];W[rc];B[rd];W[rb];B[rf]C[Black suffers a loss in gote.])

(;B[ob]C[Black 23 loses the game.];W[qe];B[pa];W[qd];B[pb];W[rb]
C[Black dies.];B[nb];W[mb];B[ra];W[rc];B[rf]
C[White can play 'a' or 'b' and win by a move.]LB[na:b][re:a])
)
)
)

(;B[pf]C[Black 9 is a fearful mistake.];W[pc];B[qe]
C[White still threatens to extend to 'a' later.]LB[qg:a])
)

(;W[qc]C[Black continues with 'a *' or 'b *'.]LB[qd:b][oc:a]
(;B[oc]C[White continues with 'a *' or 'b *'.]LB[mc:b][qd:a]
(;W[qd];B[mc]C[
* GOOD VARIATION *];W[tt]C[White plays elsewhere.];
B[qh]C[Black plays a checking extension (post-joseki).];W[qg];B[ph])

(;W[mc];B[qd];W[rd]
C['A *' is joseki. 'B' is possible, 'C' is a mistake, because White
can connect the corner to the top,]
LB[re:C][nb:B][rb:A]
(;B[rb];W[rc];B[qb];W[qh]
C[
* GOOD VARIATION *

Black can continue on 'A' or 'B'. White cannot connect on 'C'.]
PL[2]LB[ob:C][jd:B][oj:A];W[ob];B[pb];W[pc];B[od]LB[nb:B][re:A])

(;B[nb]C[White continues with 'a'. White 'b' is bad.]LB[mb:b][rb:a]
(;W[rb];B[mb]
C[White continues with 'a'. White 'b' is not recommended.]
LB[kd:b][kc:a]
(;W[kc];B[kd];W[jd];B[lc]C[Black 19 is interesting.];W[ld];B[ke];W[lb]
;B[me];W[hc]
C[White will not necessarily connect if Black gives atari at 'a'.]
LB[le:a])

(;W[kd]
C[White 16 is a not recommended. White plays this way when insecure.];
B[kc]
C[White continues with 'a' or 'b'. White 'b' is weak, but may be
reasonable in a global context.]
LB[jd:b][jc:a]
(;W[jc];B[lc];W[ld];B[jd])

(;W[jd];B[jc])
)
)

(;W[mb]C[White 'b' is inconsistent with White's 3-3 invasion.];B[re];
W[ob];B[pb];W[na];B[pc]
C[White loses the corner, and White 2 has no meaning (though aji).])
)

(;B[re]C[Black 13 is a mistake.];W[rc];B[qe];W[ob]
C[White connects underneath.];B[me];W[le];B[lf];W[ke])
)
)

(;B[qd];W[pc];B[oc];W[ob];B[od]C[White continues with 'a *' or 'b'.]
LB[mc:b][mb:a]
(;W[mb];B[me];W[ld];B[oj]C[
* GOOD VARIATION *])

(;W[mc]C[Black first cuts at 'a'. Black 'b' immediately is a mistake.]
LB[me:b][nb:a]
(;B[nb]
C[The sacrifice cut is important; compare to the other variation.];
W[pb];B[me];W[kd];B[le];W[jc];B[oj])

(;B[me]C[Black 15 is a mistake.];W[rc];B[rd];W[le];B[lf];W[ke])
)
)
)

(;W[me]C['A *' is joseki. 'B' is possible. 'C' is questionable.]
LB[nf:C][mf:B][oc:A]
(;B[oc];W[mc]C[Black continues with 'a *', or, for fighting, 'b'.]
LB[qd:b][nf:a]
(;B[nf];W[qc];B[qd];W[rd]
C[Black continues with 'a *' or 'b *'. 

Black 'c' is a mistake.]
LB[re:c][rb:b][nb:a]
(;B[nb];W[rb];B[mb];W[kc];B[mf];W[ke]C[
* GOOD VARIATION *])

(;B[rb];W[rc];B[qb];W[qh]C[
* GOOD VARIATION *];B[mf];W[lf];B[lg];
W[kf];B[kg];W[jf]
C[Black must play 'a'.

Black 'b' looks tempting, but is a mistake.]
LB[rg:b][nb:a]
(;B[nb])

(;B[rg]C[Black 25 is a mistake.];W[rf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[rh:b][nb:a]
(;B[nb]C[White continues with 'a'. White 'b' is a mistake.]
LB[mb:b][rh:a]
(;W[rh];B[mb];W[kc])

(;W[mb]C[White 28 is a mistake.];B[qg];W[pg];B[rh]
C[White may try 'a' or 'b'. Black is still connected.]LB[ob:b][pb:a]
(;W[pb];B[ob])

(;W[ob];B[pb])
)
)

(;B[rh]C[Black 27 is a mistake.];W[ob]
C[White can now connect and capture the two Black stones because
of White 26 (from the Black peep of 25 and the pullback of 27).])
)
)

(;B[re]C[Black 15 is inexcusably submissive.];W[rc];B[qe];W[ob]
C[White connects underneath.])
)

(;B[qd]C[Black 11 starts a fight.];W[nf];B[mf];W[ng];B[lf];W[jd])
)

(;B[nf];W[oc];B[pc]C[White can later push on A.]LB[od:A];W[od];B[pe])

(;B[mf]C['A' is correct. 'B' and 'C' are mistakes.]
LB[nf:C][oc:B][mc:A]
(;W[mc];B[pf];W[qc];B[qe];W[pc];B[lf])

(;W[oc];B[pc];W[od];B[oe];W[pe];B[mc])

(;W[nf];B[pf];W[pg];B[og];W[ng];B[oh])
)
)

(;W[pc]C[White 8 is not recommended.];B[oc];W[ob];B[od];W[mb];B[qc];
W[pb];B[me];W[ld]
C[Black plays on a large scale with 'a', or the tighter 'b'.]
LB[pg:b][ni:a]
(;B[ni]
C[White can cut at 'a'. If White plays elsewhere, Black 'b' is
big.]
LB[qb:b][qd:a]
(;W[qd];B[qe];W[rd];B[re];W[rc];B[pf])

(;W[tt]C[White plays elsewhere.];B[qb])
)

(;B[pg]
C[White continues with the cut of 'a', or by playing elsewhere
('b').]
LB[dp:b][qd:a]
(;W[qd];B[qe];W[rd];B[re];W[rc];B[pf])

(;W[tt]C[White plays elsewhere.];B[qb])
)
)
)

(;B[oc];W[ne];B[od]
C[White continues with 'a *' to 'c'.

White 'd' is a mistake.]
LB[me:d][of:c][nb:b][mc:a]
(;W[mc]
C[White 10 is suitable for a handicap game, as this leaves White
in a difficult position.]
;B[pf];W[pg];B[of]C[White continues with 'a *' or 'b'.]LB[pi:b][re:a]
(;W[re];B[rd];W[qd];B[qc];W[qe];B[rc];W[pi];B[pj];W[oi]
C[
* GOOD VARIATION *];B[rh];W[qg];B[oj])

(;W[pi];B[pj];W[oj];B[qi];W[qh];B[ok];W[oi];B[re])
)

(;W[nb];B[me]C[White continues with 'a'. White 'b' is a mistake.]
LB[of:b][ld:a]
(;W[ld];B[nf];W[le];B[oe]C[White continues with 'a' or 'b'.]
LB[mg:b][rd:a]
(;W[rd];B[lf];W[kf];B[lg]
C[White continues with 'a'. Playing elsewhere ('b') is a mistake.]
LB[dp:b][qh:a]
(;W[qh];B[oj];W[rb])

(;W[tt]C[White plays elsewhere, a mistake.];B[rg];W[rf];B[qg];W[qc];
B[ob];W[rb]C[Black continues at 'a', 'b' or 'c']LB[jd:c][kc:b][lb:a])
)

(;W[mg];B[re];W[ng];B[og];W[oh];B[ph];W[oi];B[pi];W[oj];B[pk])
)

(;W[of]
C[White 12 is a mistake.

Black continues with 'a'. Black 'b' is a mistake.]
LB[mc:b][ld:a]
(;B[ld];W[mc];B[mf];W[kc];B[qe]
C[White continues with 'a'. White 'b' is a mistake.]LB[rf:b][pg:a]
(;W[pg];B[ob]
C[Black settles his group, leaving White with two weak groups.])

(;W[rf]C[White 18 is a mistake.];B[pf];W[pg];B[nf];W[oe];B[og]
C[White is caught in a snap-back.])
)

(;B[mc]C[Black 13 is a mistake.];W[ld];B[mb];W[mf]
C[White gets away; the pincer stone seems a waste.])
)
)

(;W[of];B[mc];W[ld]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[oj:b][nb:a]
(;B[nb])

(;B[oj]C[Black 13 is a mistake.];W[nb]
C[White 14 begins a sacrifice squeeze play.];B[lb];W[lc];B[mb];W[kb];
B[ob];W[jc])
)

(;W[me]C[White 10 is a mistake.];B[mc];W[lc];B[nb]
C[White may try 'a' or 'b'.]LB[of:b][mb:a]
(;W[mb];B[pf];W[pg];B[of]C[White is split in two.])

(;W[of];B[lb])
)
)
)

(;B[oe]C[Black 5 aims for simplicity.];W[qc];B[qd];W[pc]
C[Black continues with 'a *', or possibly the fighting move of
'b'. Black 'c' is not recommended, and Black 'd' is a genuine
mistake.]
LB[rc:d][pg:c][md:b][me:a]
(;B[me]C[
* GOOD VARIATION *];W[ld];B[oj])

(;B[md]C[Black 9 provokes a fight.];W[nd];B[ne];W[me];B[kd]
C[White continues with 'a', possibly 'b'.]LB[ld:b][mf:a]
(;W[mf];B[mc];W[mb];B[lb];W[nb];B[og]
C[White has the shoulder hit of 'a' to keep the situation unsettled.]
LB[pi:a])

(;W[ld]C[White 14 is not recommended.];B[le];W[mc];B[mf])
)

(;B[pg]
C[Capturing White 2 by playing Black 9 is too small in the early
game. Black becomes over-concentrated.]
;W[od]C['A' is correct, 'B' is inferior.]LB[pe:B][nd:A]
(;B[nd];W[oc];B[pe];W[md];B[ne];W[rd];B[re];W[rc];B[qe])

(;B[pe];W[ne];B[nf];W[me])
)

(;B[rc]C[Black 9 is a mistake in direction.];W[rb];B[rd]
C[White continues with 'a' or 'b'.]LB[pi:b][ne:a]
(;W[ne];B[nf];W[me];B[pg];W[mf])

(;W[pi]C[White 12 might be a good move in a handicap game.])
)
)

(;B[pf]
C[Black 5 is a mistake in direction.

When there are two small knight approach moves, the rule is to
attach on the side where there is no pincer, then make full use
of the influence of the pincer. The pincer goes to waste playing
this direction.]
;W[pg];B[of];W[qd];B[qe];W[re];B[pe];W[rg];B[qc];W[rd];B[og];W[ph];
B[jc]C[If Black plays 17...];W[kd]
C[...the shoulder hit of White 18 makes Black gain problematic.])

(;B[qc];W[oe])
)

(;W[nd]C[Black continues with 'a *', 'b *', 'c *', 'd *'.]
LB[oe:d][qe:c][ne:b][pf:a]
(;B[pf];W[pg];B[of];W[qe]
C[Black continues with 'a *'. Black 'b' is unreasonable.]
LB[qd:b][od:a]
(;B[od]C[White continues with 'a *'. White 'b' and 'c' are mistakes.]
LB[qc:c][nc:b][rc:a]
(;W[rc]C[Black continues with 'a *' or 'b'.]LB[jd:b][nc:a]
(;B[nc]C[
* GOOD VARIATION *];W[mc];B[md];W[ne]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[lc:b][ld:a]
(;B[ld]
C[Black aims to capture the stones by playing at the marked spot.

White may try 'a' or 'b'. Neither work to White's advantage.]
LB[oc:b][lc:a]CR[mf]
(;W[lc];B[kc];W[kb];B[kd];W[nb];B[oc];W[jb];B[mf])

(;W[oc];B[nb])
)

(;B[lc]C[Black 15 is a mistake.];W[mb]
C[Black continues with 'a' or 'b'.]LB[lb:b][nb:a]
(;B[nb];W[lb];B[kc];W[ld];B[me];W[kd]C['a' and 'b' are miai.]
LB[jc:b][mf:a])

(;B[lb];W[nb];B[oc];W[ld];B[me];W[kd]LB[kb:b][mf:a])
)
)

(;B[jd]C[White continues with 'a', possibly 'b'.]LB[nb:b][og:a]
(;W[og];B[me];W[ng];B[mf])

(;W[nb]C[Black continues with 'a' or 'b'.]LB[pb:b][qc:a]
(;B[qc];W[rb];B[mf];W[pb];B[og];W[ph];B[rh];W[rg];B[oj])

(;B[pb])
)
)
)

(;W[nc]C[White 10 is an overplay.];B[qd];W[qh];B[oj];W[nh];B[me];W[kc]
;B[oc]
C[Black gets a nice corner, and White has two insecure groups on
either side.])

(;W[qc];B[qd];W[rd];B[rc];W[rb];B[qg];W[qh];B[rg]
C[Neither 'A' nor 'B' work.]LB[rh:B][sc:A]
(;W[sc];B[rh])

(;W[rh];B[og];W[ph];B[re];W[rf];B[sd])
)
)

(;B[qd]C[Black 9 is unreasonable.];W[pe];B[oe];W[od]C['A' or 'B'.]
LB[qg:B][rd:A]
(;B[rd];W[qh];B[mf];W[pc];B[qc];W[pb];B[qb];W[ld]
C[Black needs another move in the corner, but is busy in the center.
Not good.])

(;B[qg];W[rd];B[rc];W[re]C[Black continues with 'a' or 'b'.]
LB[qb:b][rg:a]
(;B[rg];W[qb]C[Neither Black 'a' nor 'b' work.]LB[rb:b][qc:a]
(;B[qc];W[rb]C[Neither Black 'a' nor 'b' work.]LB[sc:b][pb:a]
(;B[pb];W[sc];B[pc];W[ob])

(;B[sc];W[pc];B[pb];W[oc];B[sb];W[sd])
)

(;B[rb];W[qc];B[pc];W[pb])
)

(;B[qb];W[qh])
)
)
)

(;B[ne]
C[Black 5 is a strong move.

White continues with 'a *', 'b *' or 'c *'. White 'd' is bad
style, and not recommended.]
LB[od:d][oe:c][qc:b][me:a]
(;W[me];B[oe]
C[White continues with 'a *'. White 'b' is not recommended.]
LB[ld:b][qc:a]
(;W[qc]C[
* GOOD VARIATION *];B[qd];W[pc]
C[Black continues with 'a *' to 'c *'.]LB[oc:c][md:b][rc:a]
(;B[rc];W[od];B[pf];W[rb];B[rd];W[md];B[oj]C[
* GOOD VARIATION *])

(;B[md];W[nc]
C[A fight ensues. See the variation referenced by the numbers.]
LB[me:12][ne:11][nd:10][md:9][pc:8][qd:7][qc:6][oe:5][nc:4][qj:3][qf:2][pd:1])

(;B[oc]C['A *' is joseki, 'B' is a trick play.]LB[rd:B][od:A]
(;W[od];B[ob]C[White continues with 'a *' or 'b'.]LB[md:b][nc:a]
(;W[nc];B[rc];W[pe];B[qe];W[pf];B[og]
C['A *' is correct, 'B' is a mistake.]LB[ng:B][rd:A]
(;W[rd];B[re];W[rb];B[sd];W[pb];B[rf];W[ld];B[ng]
C[
* GOOD VARIATION *])

(;W[ng];B[of];W[oh];B[pg];W[rf];B[re];W[sf];B[qb];W[ph];B[qg];W[rh];
B[mf])
)

(;W[md];B[rc];W[pe];B[qe];W[pf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[og:b][nf:a]
(;B[nf];W[pi])

(;B[og]C[Black 19 is a mistake.];W[ng];B[of];W[oh];B[pg];W[qh];B[nh];
W[ph];B[nf];W[mg];B[qg];W[rf])
)
)

(;W[rd]C['A' is the correct punishment, 'B' is a mistake.]
LB[re:B][md:A]
(;B[md];W[ob];B[nb];W[mc];B[ld];W[nc];B[od];W[mb];B[rc];W[qb];B[re]
C[Later, Black has A.]LB[lb:A])

(;B[re];W[rc];B[qe];W[od]C[Neither 'A' nor 'B' work.]LB[nc:B][md:A]
(;B[md];W[nc];B[mc];W[nb];B[mb];W[ob];B[ic];W[pf];B[pe];W[rf];B[se]
C['A' is correct, 'B' is a mistake.]LB[mf:B][pi:A]
(;W[pi];B[pj];W[ni])

(;W[mf];B[nf];W[ng];B[og]C[Neither 'A' nor 'B' work.]LB[oh:B][of:A]
(;W[of];B[mg];W[nh];B[lf])

(;W[oh];B[mg];W[nh];B[lf])
)
)

(;B[nc];W[md];B[mc];W[pf];B[pe];W[rf];B[se];W[mf];B[ng];W[nf];B[of];
W[og];B[pg];W[oh];B[sf];W[sg])
)
)
)
)

(;W[ld]
C[White 8 is not recommended. Black continues with 'a'. Black 'b'
is not recommended.]
LB[pg:b][qc:a]
(;B[qc]C[Black gets a good result whatever follows.])

(;B[pg]C[Black 9 is not recommended.];W[qc];B[qd];W[pc];B[rc];W[od];
B[pf];W[rb];B[rd]
C[Now Black 9 is misplaced: it should be at the marked location.]
CR[oj])
)
)

(;W[qc];B[qd]C[White continues with 'a *'. White 'b' is a trick play.]
LB[od:b][pc:a]
(;W[pc];B[od];W[oc]C[Black continues with 'a *' or 'b'.]LB[md:b][of:a]
(;B[of];W[md];B[oj]C[
* GOOD VARIATION *])

(;B[md];W[nc];B[of];W[me]
C['A' is correct, 'B' gives White too much territory.]LB[mf:B][ld:A]
(;B[ld];W[mf]C['A' or 'B'.]LB[oh:B][pg:A]
(;B[pg];W[ke];B[jc])

(;B[oh];W[rd];B[re];W[qe];B[rc])
)

(;B[mf];W[le];B[lf];W[ke];B[kf];W[je];B[oj])
)
)

(;W[od]
C[White 8 is a trick play. Black continues with 'a'. Black 'b'
is a mistake.]
LB[oe:b][pc:a]
(;B[pc];W[oe]
C[Black continues with 'a'. Black may also play elsewhere ('b').]
LB[dp:b][pf:a]
(;B[pf];W[pe];B[qe];W[qg]C[Black continues with 'a' or 'b'.]
LB[pg:b][of:a]
(;B[of];W[nf];B[ph];W[me];B[oh])

(;B[pg];W[ph];B[nf]C[One of the two White groups is forfeit.])
)

(;B[tt]C[Black plays elsewhere.];W[oi]
C[White 11 creates flexible shape.
White now threatens mischief by playing 'a'.]
LB[rb:a])
)

(;B[oe]C[Black 9 is a mistake.];W[pc]
C[Now White has played the vital point of 8.];B[pe];W[md]
C[Later, White A is sente.]LB[rd:A])
)
)

(;W[oe]C[With the board as is, White 6 is not recommended.];B[od]
C[White continues with 'a *' or 'b'.]LB[of:b][pe:a]
(;W[pe];B[qd]
C[
* GOOD VARIATION *

Black 9 is the vital point of this shape.];
W[nc]
C[
If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.])

(;W[of];B[md];W[nc];B[mc]C[White continues with 'a' or 'b'.]
LB[ob:b][nb:a]
(;W[nb];B[mb];W[pb];B[pc]C[Now 'a' and 'b' are miai.]LB[qb:b][ob:a])

(;W[ob];B[mb]
C[According to Ishida's Dictionary of Basic Joseki, Black wins
the capturing race.]
;W[qb];B[oc];W[nb];B[pb])
)
)

(;W[od]
C[White 6 is obviously bad style, but seems possible. Nonetheless,
Black should come out with a favorable result.]
;B[oe]C[White continues with 'a'. White 'b' is not recommended.]
LB[pe:b][pc:a]
(;W[pc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qd:b][qc:a]
(;B[qc]C[Black 9 is a tesuji.];W[qd];B[pe]
C[White continues with 'a'. White 'b' is a mistake.]LB[oc:b][qe:a]
(;W[qe];B[oc];W[pb];B[nc];W[qb];B[md]
C[Black 17 makes the "tortoise shell" shape, supposedly a shape
twice as strong as ponnuki.])

(;W[oc]C[White 12 is a mistake.];B[qe];W[rd];B[re];W[rc];B[me])
)

(;B[qd]C[Black 9 is a mistake.])
)

(;W[pe]C[White 8 is not recommended.];B[qd]
C[White may try 'a' or 'b'. Either way, Black should be able to
wrest an advantageous position.]
LB[pg:b][md:a]
(;W[md];B[pg])

(;W[pg];B[md])
)
)
)

(;B[qe]C[Black 5 is a strong response.];W[pf];B[oe]
C[The combination of Black 5 and 7 may be unreasonable unless Black's
neighboring positions are strong.
'A *' is joseki, 'B' is inferior.]
LB[qc:B][pe:A]
(;W[pe]C[Black continues with 'a *'. Black 'b' is hard to fathom.]
LB[qd:b][od:a]
(;B[od];W[qd];B[qc];W[re]C['A *' or 'B'.]LB[rc:B][rd:A]
(;B[rd];W[pi];B[pj];W[oi];B[nc]C[
* GOOD VARIATION *])

(;B[rc]
C[Black 13 unwillingness to fight the ko contradicts Black's original
strategy of the diagonal attachement.]
;W[nc]
C[White 14 starts a sequence where it's hard to tell who's attacking
whom, a big change from Black's early uncompromising moves.]
;B[ne];W[me];B[mf];W[le];B[og];W[ph])
)

(;B[qd]C[Black 9 is hard to justify.];W[od];B[ne];W[pi];B[me];W[ob]
C[Black faces a hard fight. The three Black stones in the corner
may have to fight for life, and three Black stones in the center
are a good attack target.])
)

(;W[qc];B[pc]C['A' is correct, 'B' is inferior.]LB[re:B][qd:A]
(;W[qd]
C['A' is correct, 'B' is only good, if Black is already strong
on the top side.]
LB[pe:B][re:A]
(;B[re];W[pe];B[qb];W[od];B[rc];W[nf])

(;B[pe];W[re];B[rd];W[rc];B[rf];W[sd];B[of];W[ph];B[qh];W[rg];B[pg];
W[qg];B[og];W[jd])
)

(;W[re];B[qd];W[rd];B[rc];W[nf];B[of];W[og];B[ng])
)
)

(;B[oe];W[qc];B[qd];W[pc];B[rc];W[od];B[pf]
C['A *' is joseki, 'B' is possible.]LB[ne:B][rb:A]
(;W[rb];B[rd]
C[
* GOOD VARIATION *

White 'a' is a possible continuation. White 'b' is not recommended
if the shape at the top is unsettled.]
LB[pg:b][ne:a]
(;W[ne];B[nf];W[mf];B[ng];W[mg];B[nh])

(;W[pg]
C[White 14 is not recommended with the shape at top unsettled;
the move is something of an overplay. White 14 is a tactic for
stirring complication, as in a handicap game.]
(;B[ne];W[md];B[me];W[ld];B[le]C[White continues with 'a' or 'b'.]
LB[qh:b][kd:a]
(;W[kd];B[qh];W[qg];B[oh];W[og];B[ng]
C[White must abandon the stones on the right, though they retain
some aji.])

(;W[qh];B[kd];W[kc];B[jc];W[lb];B[kb];W[lc];B[jd])
)

(;B[og];W[pi])
)
)

(;W[ne];B[nf];W[pg]C['A' is correct, 'B' is wrong.]LB[og:B][re:A]
(;B[re])

(;B[og];W[rd];B[re];W[qe];B[sd];W[pe])
)
)
)

(;W[md]
C[Black continues with 'a *' or 'b *'. Attaching at 'c', on the
side with the pincer, is not good.
'd' is possible. 'e' is weak.]
LB[rd:e][nc:d][pf:c][oe:b][nd:a]
(;B[nd]
C[White continues with 'a', 'b *' or 'c *'. White 'd' is not recommended.]
LB[mc:d][me:c][ne:b][nc:a]
(;W[nc];B[ne])

(;W[ne];B[nc]C[White continues with 'a *' or 'b'.]LB[qd:b][oe:a]
(;W[oe];B[qd]
C[
* GOOD VARIATION *

White continues with 'a'.
'b' and 'c' are inferior.]
LB[me:c][mc:b][lf:a]
(;W[lf];B[mc];W[ld])

(;W[mc];B[me];W[og];B[le];W[kc];B[mb];W[lb];B[nb];W[kd];B[lg]
C[The triangled Black stone limits the right White group.]TR[qj])

(;W[me];B[lb])
)

(;W[qd]C[Black continues with 'a'. Black 'b' is weak.]LB[qc:b][me:a]
(;B[me]C['A' is correct, 'B' is wrong. 'C' is possible.]
LB[of:C][oe:B][qc:A]
(;W[qc];B[nf])

(;W[oe];B[pe];W[pf];B[pc];W[qe];B[ld];W[mf];B[le]
C[The triangled Black stone limits the right White group.]TR[qj])

(;W[of];B[ld];W[mf];B[le];W[pc];B[pe];W[qc];B[lf])
)

(;B[qc]
C[Black 9 is submissive. Nothing good comes to Black from this
variation.]
;W[pe]C[Black continues with 'a' to 'c'.]LB[pc:c][rd:b][od:a]
(;B[od];W[oe])

(;B[rd];W[qe];B[oe];W[of];B[od];W[mf])

(;B[pc];W[mf])
)
)
)

(;W[me];B[pf];W[pg];B[of]C['A *' or 'B'.]LB[nc:B][qd:A]
(;W[qd];B[qc];W[qe];B[rc]C[White continues with 'a *' or 'b'.]
LB[nc:b][qh:a]
(;W[qh];B[nc]C[
* GOOD VARIATION *])

(;W[nc];B[oc];W[ne];B[od])
)

(;W[nc];B[oc];W[ne];B[od];W[nb];B[pi];W[rd];B[qg];W[qc];B[ob];W[rg];
B[qh];W[rf];B[nh])
)

(;W[mc]C[White 6 is a heavy move.];B[nc]
C[White continues with 'a' or 'b'.]LB[me:b][rd:a]
(;W[rd];B[me];W[kd];B[qc];W[qh];B[oj];W[oh];B[nf])

(;W[me];B[pf];W[pg];B[of];W[qd];B[qc];W[qe];B[rc])
)
)

(;B[oe]C[White continues with 'a' or 'b *'.
'c' is inferior.]
LB[og:c][qc:b][rd:a]
(;W[rd];B[pg];W[qg];B[ph];W[qc];B[pc])

(;W[qc];B[qd]
C[White continues with 'a *'. White 'b' is not recommended.]
LB[pc:b][rd:a]
(;W[rd];B[re];W[rb];B[sd];W[rc];B[qe];W[nc];B[nf]
C[
* GOOD VARIATION *

Later, Black continues on A only with a stone on the triangled
position.]
PL[2]LB[oc:A]TR[kc]
(;AB[kc];B[oc]C[Later, Black can continue here.];W[ob];B[nb]
C[Now, A and B are miai.]LB[pb:B][mb:A])

(;B[oc];W[ob];B[nb]C['A' is recommended, 'B' leads to a ko.]
LB[pc:B][pb:A]
(;W[pb];B[mb];W[lc])

(;W[pc];B[nd])
)
)

(;W[pc]C[White 8 is not recommended.];B[oc];W[ob];B[nc]
C[White 4 is isolated, and White cannot connect to 2 either.])
)

(;W[og];B[qe]C['A' or 'B'.]LB[rf:B][mf:A]
(;W[mf];B[rf])

(;W[rf];B[nf];W[ng];B[mf])
)
)

(;B[pf]
C[Black 5 is not recommended. Attaching on the side of the pincer
in a double approach situation is almost never good.]
;W[pg];B[of]C['A' or 'B'.]LB[qe:B][qd:A]
(;W[qd]C['A' or 'B'.]LB[qe:B][qc:A]
(;B[qc];W[qe];B[pc]C['A' or 'B'.]LB[nc:B][qh:A]
(;W[qh]
C[White 'a' is sente, so White's second approach move has good
development potential.]
LB[nc:a])

(;W[nc];B[pe];W[qh])
)

(;B[qe];W[re];B[pe];W[rg];B[qc];W[rd]
C[The wall wall is restricted by the triangled White stone.]TR[md])
)

(;W[qe];B[qd];W[qi];B[pj];W[pe];B[oe];W[od]
C['A' is correct, 'B' is inferior.]LB[nd:B][oc:A]
(;B[oc];W[nd];B[og];W[rd];B[rc];W[re];B[ph];W[rb];B[qb];W[sc];B[qc];
W[sb];B[ob];W[qg];B[mb])

(;B[nd];W[oc];B[nc];W[ob];B[nb];W[qc];B[me])
)
)

(;B[nc];W[nd];B[mc];W[lc];B[od];W[kd];B[pf];W[pg];B[of];W[qh])

(;B[rd];W[oe])
)
)

(;B[ph]
C[
Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia = 1-Space High Pincer
----------------------------------------------------------------------------

Unknown in classical Go, Black 3 shows a modern approach to fuseki.

White plays 'a', 'b *', 'c *', 'd *' or 'e'.

With an extension the marked spot, Black would welcome the invasion
of 'b'.
]
LB[nd:e][nc:d][qd:c][qc:b][of:a]MA[jd]
(;W[of];B[nd]
C[White continues with 'a'. White 'b' is not recommended.]
LB[qc:b][rd:a]
(;W[rd]C[Black continues with 'a' or 'b'.]LB[qg:b][qc:a]
(;B[qc];W[rh]
C[
The result is favorable for Black, because White is too low.
'A' or 'B'.
'C' was played by Cho Hyeo Yeon 5P against Rui Naiwei 9P 2005,
Jan 1st, in 6th Women's Myeon In Challenge, game 2, and has a
continuation on 'A'.
]
LB[kc:C][jc:B][og:A]
(;B[og]
C[White must defend against Black 9.
'A' good defense.
'B' bad way of defense.
'C' black attack after playing elsewhere.]
PL[2]LB[og:9][qg:C][pg:B][nf:A]
(;W[nf];B[kc];W[pe])

(;W[pg];B[qh];W[rg];B[qj];W[ng];B[oh];W[mf];B[kc]
C[Now Black is solid on both sides, bad for White.])

(;B[qg];W[rg];B[pf];W[pe];B[qe]C[Ko for life, not what White wanted.])
)

(;B[jc])

(;B[kc]PL[2];B[og]C[Later, the game was continued like this.];W[ne];
B[ng];W[md];B[od];W[pf];B[me];W[ld];B[mf]C[White ladder.];W[kd];B[jd];
W[kf];B[mc];W[lc];B[lb];W[je];B[jb];W[id];B[jc];W[qi];B[oj];W[ie])
)

(;B[qg]C['A' is usual, 'B' old style.]LB[rf:B][pg:A]
(;W[pg];B[qh];W[rf];B[qc];W[oh];B[oi];W[nh];B[ni];W[mh])

(;W[rf];B[qc]C[White continues with 'a', 'b' or 'c'.]
LB[oh:c][pk:b][mf:a])
)
)

(;W[qc]C[White 6 is not recommended.];B[qd];W[rd];B[re];W[rc]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[qe:b][rf:a]
(;B[rf]C[White continues with 'a'. White 'b' is a mistake.]
LB[qg:b][ob:a]
(;W[ob];B[qg])

(;W[qg]C[White 12 is a mistake.];B[qh];W[rg];B[qe];W[ob];B[rh]
C['A' White stones heavy, 'B' White stones dead.]LB[sg:B][og:A]
(;W[og];B[sg])

(;W[sg];B[og];W[oe];B[pf];W[pg];B[od];W[pe];B[ng])
)
)

(;B[qe]C[Black 11 is a mistake.];W[ob];B[qg]
C[White has the aji of 'a' later.]LB[rf:a])
)
)

(;W[qc]C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[qd:b][pc:a]
(;B[pc];W[qd];B[pe]C[White continues with 'a', 'b' or 'c'.]
LB[pf:c][qb:b][qe:a]
(;W[qe];B[pf]
C[White continues with 'a'. White 'b' is a bit unreasonable.]
LB[pg:b][qg:a]
(;W[qg];B[pg]C[
* GOOD VARIATION *])

(;W[pg]
C[White 10 is an overplay.

Black continues with 'a'. Black 'b' is too mild.]
LB[og:b][qg:a]
(;B[qg];W[og];B[rg];W[pb];B[ob];W[qb];B[nc])

(;B[og]C[Black 11 is too kind to White.];W[qg];B[oh])
)
)

(;W[qb];B[pf];W[qg];B[pg]C[White cannot jump to A now.]LB[qi:A];W[qi];
B[qh];W[rh];B[rg])

(;W[pf];B[qe];W[re];B[rd];W[rc];B[rf];W[sd]C['A' or 'B'.]
LB[rg:B][of:A]
(;B[of];W[rg];B[qg];W[sf];B[pg];W[rf];B[ng])

(;B[rg];W[of];B[md])
)
)

(;B[qd]
C[Black 5 is not recommended, as Black 3 is not in good position.];
W[pc];B[od];W[rd];B[re];W[rc];B[qe];W[nc]
C[Black 'a' would make Black somewhat over-concentrated, but doing
nothing leaves White open to setting White 2 in motion.]
LB[pf:a])
)

(;W[qd];B[qc];W[pc]C['A *' is joseki, 'B' is inferior.]LB[od:B][oc:A]
(;B[oc];W[pb];B[qe];W[rd]
C['A *' is joseki and makes a wall to the top side. 'B' is a variaton
and give White the choice of the direction of the Black wall.]
LB[pe:B][od:A]
(;B[od]C['A *' is joseki, 'B' slightly inferior.]LB[pe:B][rc:A]
(;W[rc];B[ob];W[qb];B[pf]C[
* GOOD VARIATION *])

(;W[pe];B[oe];W[re];B[og])
)

(;B[pe]
C['A' -> Black wall faces the right side, 'B' -> Black wall faces
the top side.]
LB[re:B][ob:A]
(;W[ob];B[re];W[rc];B[nc])

(;W[re];B[ob];W[qb];B[pf];W[qg];B[pg])
)
)

(;B[od];W[rc];B[qb];W[re]
C['A' keeps the Black stones connected, 'B' tries to attack the
White stones.]
LB[rb:B][pf:A]
(;B[pf];W[ob];B[mc];W[pb];B[qg])

(;B[rb];W[of];B[qk])
)
)

(;W[nc];B[pf]
C['A *' is joseki. 'B' is a mistake and loses a big corner for
a small wall to the right side. 'C' is a mistake, because the
White corner will be more tightly enclosed than in the joseki.]
LB[pg:C][pe:B][qc:A]
(;W[qc];B[pc];W[qd];B[qe];W[re];B[pe];W[rf];B[jd]
C[
* GOOD VARIATION *])

(;W[pe];B[qe];W[oe];B[qd];W[pg];B[of];W[og];B[nf];W[qg];B[nd])

(;W[pg];B[og];W[qg];B[qh];W[pe];B[of];W[qd];B[oe];W[qe];B[oc];W[qc];
B[nd])
)

(;W[nd];B[pf]
C['A' is joseki. 'B' is inferior and trades the corner for outside
influence, White needs the ladder. 'C' is a mistake and loses
a big corner for a small wall to the right.]
LB[pe:C][pg:B][qc:A]
(;W[qc]LB[pc:A][qe:B][ph:3]
C['A' is correct, 'B' is a mistake with Black 3.
]
(;B[pc];W[qd];B[qe];W[re];B[pe];W[rf];B[jd])

(;B[qe];W[pc]PL[2]LB[qf:2][qg:A]C[Later White 2 can escape on A.
])
)

(;W[pg]C['A' is correct, 'B' is a mistake.]LB[og:B][qg:A]
(;B[qg];W[og]C['A' or 'B' After'B' White needs the ladder.]
LB[qe:B][qh:A]
(;B[qh];W[pe]C['A' is correct, 'B' is nonsense.]LB[of:B][qe:A]
(;B[qe];W[of];B[rf];W[qd];B[pf];W[oe];B[qc])

(;B[of];W[oe];B[nf];W[qd])
)

(;B[qe];W[qh];B[rf];W[rg];B[qf];W[pi]
C[Black lives in the corner, so shouldn't provoke a White ponnuki
by playing A, but use the ladder for a ladder breaker. So, Black
is still better. One ladder breaker is B to capture White 4,
so an ataack against White 4 like C is sente.]
LB[lc:C][nd:4][of:B][rh:A])
)

(;B[og];W[qg];B[qh];W[pe];B[of];W[oe];B[qe];W[qd];B[re];W[rd];B[rg];
W[pc]C[White has got more points.])
)

(;W[pe];B[qe];W[oe];B[qd];W[pg];B[of]LB[qg:B][og:A]
(;W[og];B[nf];W[qg];B[md])

(;W[qg];B[og];W[ri];B[oh];W[qj];B[mc];W[md];B[nc];W[ld];B[od];W[ne];
B[lh])
)
)
)

(;B[pi]
C[
Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia = 2-Space High Pincer
-----------------------------------------------------------------------------

Black 3 is used most often when Black has an extension at top.

White continues with 'a *', 'b *', 'c *' or 'd *'.
'b *' leads to the Cataccio joseki which is used to reduce a big Black moyo, but not advisable in other cases.
'e' is a special strategy.
]
LB[qk:e][nd:d][nc:c][of:b][qc:a]
(;W[qc]
C[Black continues with 'a *' or 'b *'. 'b' is played when Black
has support at top.]
LB[pc:b][qd:a]
(;B[qd]C[When Black has no extension at top.];W[pc]
C[Black continues with 'a *'. Black 'b' is a mistake.]LB[oc:b][od:a]
(;B[od];W[rd];B[re];W[rc];B[qe];W[nc];B[pf]C[
* GOOD VARIATION *])

(;B[oc]
C[Black 7 is a mistake.

White continues with 'a', possibly 'b'. White 'c' is not recommended.]
LB[ob:c][rd:b][rc:a]
(;W[rc]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[rd:b][od:a]
(;B[od];W[rd];B[kd]
C[Black plays an extension towards the top as shown (11 being just
one possible point; others nearby may be preferred). Black may
also play elsewhere.

This sequence is very favoable to White.])

(;B[rd]
C[Black prevents White's attempt to connect, but at considerable
cost.]
;W[od]
C[Black has no adequate continuation, as either the Black 7 cutting
stone or three Black stones are subject to capture.]
;B[oe]C[Black gives up on the cutting stone.];W[nd];B[pf];W[nc]
C[The result is very favorable to White, as White gains territory
and thickness.

White 2 still has aji.])
)

(;W[rd];B[re];W[rc];B[qe];W[od]
C[Black continues with 'a'. Black 'b', or descending from 7 is
a mistake.]
LB[nc:b][pf:a]
(;B[pf]C[At this point, Black must submit with 13.];W[nc];B[oe];W[nd])

(;B[nc]C[Black 13 or descending from 7 is not good.]MA[ob];W[rf]
C[Black continues with 'a'. Black 'b' is unreasonable.]LB[se:b][oe:a]
(;B[oe];W[se];B[pe])

(;B[se]C[Black 15 is a mistake.];W[oe]C[Black is doomed.])
)
)

(;W[ob]
C[White 8 fails to punish Black for playing 7, a missed opportunity.

Black continues with 'a'. Black 'b' is a mistake.]
LB[nb:b][nc:a]
(;B[nc];W[nb];B[mc];W[rd];B[re];W[rc];B[qe])

(;B[nb]C[Black 9 is unreasonable. Black has too many cutting points.];
W[od];B[nc];W[rd];B[re];W[pe])
)
)
)

(;B[pc]AB[jd]C[When Black has an extension at top.];W[qd];B[pe]
C[White continues with 'a *', 'b *', 'c *', 'd *' or 'e *'.

e5, d4, c3, b2, a1]
LB[rg:e][qg:d][pf:c][qe:b][qb:a]
(;W[qb]C[Black continues with 'a *' or 'b'.]LB[pb:b][pf:a]
(;B[pf];W[qg];B[pg]C[
* GOOD VARIATION *];W[pb]
C[Continuation later
Black answers on 'A' or 'B'.]LB[ob:B][nc:A]
(;B[nc])

(;B[ob];W[nb];B[nc])
)

(;B[pb];W[pf];B[of];W[og];B[pg];W[nf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[qe:b][oe:a]
(;B[oe];W[rg];B[qg];W[rf];B[qi];W[ng];B[md];W[ni])

(;B[qe]
C[Black 15 is a mistake, upsetting Black's strategy of gaining
thickness for less than 20 points of territory.]
;W[oe];B[re])
)
)

(;W[qe];B[pf];W[pg];B[og];W[oh];B[ph];W[qg]
C[Black continues with 'a *'. Black 'b' is a mistake.]LB[nh:b][ng:a]
(;B[ng]
C[
* GOOD VARIATION *

White hopes later to play 'a', while Black would like to eliminate
the White aji with Black 'b'.]
LB[mi:b][nh:a])

(;B[nh]C[Black 15 is a mistake.];W[ng];B[oi];W[of];B[oh];W[pb];B[ob];
W[oc];B[qb];W[od];B[pa];W[oe];B[pb];W[nb])
)

(;W[pf];B[qe];W[re]
C[Black continues with 'a *'. Black 'b' is a mistake.]LB[rf:b][rd:a]
(;B[rd]
C['A *' is joseki, 'B' is good only if White is very strong on
the right, while the top is worthless.]
LB[rg:B][rc:A]
(;W[rc];B[rf];W[sd];B[of]C[White continues with 'a' or 'b *'.]
LB[og:b][rg:a]
(;W[rg]C['A' is joseki, 'B' takes sente.]LB[qg:B][og:A]
(;B[og]C[Later, White invades on 'A' or 'B'.]LB[mc:B][lc:A]
(;W[lc];B[kc];W[nc];B[ne];W[kb];B[jb];W[kd];B[jc];W[md];B[ke];W[ob];
B[pb];W[mb])

(;W[mc];B[ld];W[pb];B[ob];W[oc];B[nc];W[nb];B[od];W[oa])
)

(;B[qg];W[pg];B[og];W[qh];B[ph];W[sf])
)

(;W[og]C[Black continues with 'a *' or 'b'.]LB[ng:b][pg:a]
(;B[pg];W[qg]C['A *' is joseki, 'B' is inferior.]LB[ph:B][rg:A]
(;B[rg]
C[Black 19 is a sacrifice.
'A *' is correct, 'B' is very bad without the ladder.]
LB[ph:B][qh:A]
(;W[qh];B[ph];W[ri]
C[Black continues with 'a *'. Black 'b' is playable, but not recommended.]
LB[rj:b][nf:a]
(;B[nf]
C[
* GOOD VARIATION *

White can play elsewhere ('a'), or continue locally with 'b'.]
LB[qj:b][dp:a]
(;W[tt]C[White plays elsewhere. Black 'a' through 'f' are sente.]
LB[ql:f][pk:e][qk:d][pj:c][oj:b][qj:a]
(;B[qj]
C[Black 24, otherwise Black plays 'a' and captures the White stones.
Later, White invades on 'b' or c, not on 'd'.]
LB[nd:d][lc:c][mc:b][rh:a]
(;W[mc];B[jf];W[pb];B[ob];W[oc];B[od];W[nb];B[nc];W[oa])

(;W[nd]C['A' is correct, 'B' is a mistake.]LB[ne:B][ob:A]
(;B[ob];W[oe]C[Doesn't work.];B[nc])

(;B[ne];W[pb];B[ob];W[oc])
)
)

(;B[oj]C[Black 24 is sente.];W[tt]C[White plays elsewhere; a mistake.]
;B[rh];W[qi];B[qj];W[rj];B[rk];W[qk];B[sj];W[pj];B[si];W[qj];B[ql])
)

(;W[qj]AB[pp]
C[White 24 eliminates the aji problem of the other variation, but
gives Black additional thickness.]
;B[pj];W[qk];B[pk]
C[White continues with 'a'. White 'b' is an overplay.]LB[pl:b][ql:a]
(;W[ql])

(;W[pl]C[White 28 is an overplay.];B[ql];W[qm];B[rk]
C[White 'a' and 'b' are both traumatic.]LB[rh:b][rl:a]
(;W[rl];B[qi];W[rh];B[rj])

(;W[rj];B[rl];W[rh];B[qn];W[rm];B[pm];W[sk];B[ol];W[sl];B[pl])
)
)
)

(;B[rj]
C[Black 23 is not recommended, as it removes aji of Black sente
(see the joseki variation).]
;W[rh];B[si];W[sf];B[nf])
)

(;W[ph];B[qh];W[pg];B[ng];W[oh];B[nh])
)

(;B[ph];W[rg];B[nf])
)

(;B[ng]
C[Black 17 was invented by Abe against Tozawa in a preliminary
round of the 1970 Nihon Ki-in Chamionship.]
;W[pg]
C[Further resistence would be futile, so connecting at 18 is proper.];
B[nh]C[Tozawa played 'a', but 'b' looks like a missed opportunity.]
LB[oe:b][nf:a]
(;W[nf];B[oe];W[rg];B[mf])

(;W[oe];B[nf];W[pb]C[Black continues with 'a' or 'b'.]LB[nd:b][oc:a]
(;B[oc];W[ob];B[nc];W[rg]C[White 'a' is a good forcing move later.]
LB[nb:a])

(;B[nd];W[nc];B[od];W[md];B[rg];W[lc]C[The joseki concludes.];B[tt];
W[qh]C[White tries to extract his stones.];B[rh];W[qi];B[ph];W[qg];
B[qj];W[ri];B[rj])
)
)
)
)

(;W[rg];B[se];W[rf];B[rc];W[nf])
)

(;B[rf]
C[Black 11 is a mistake.

White continues with 'a'. White 'b' is a mistake.]
LB[rd:b][rg:a]
(;W[rg];B[rd];W[sf];B[rc];W[nf])

(;W[rd]C[White 12 is a mistake.];B[of]
C[Black is satisfied that White has let Black overcome the mistake
of Black 11.])
)
)

(;W[qg]C['A *' is joseki, 'B' is an inferior variation.]LB[pf:B][qe:A]
(;B[qe];W[re];B[rf]
C['A *' is joseki. 'B' is a mistake unless the corner is smaller
than the right side.]
LB[rg:B][rd:A]
(;W[rd]
C[Black continues with 'a *' or 'b'. 'a' is joseki and builds the
wall. After 'b', Black cannot stop White from entering the top
by giving the right side.]
LB[pg:b][pf:a]
(;B[pf];W[pg];B[og]C['A *' and 'B *' are joseki.]LB[oh:B][rg:A]
(;W[rg];B[oh]C[
* GOOD VARIATION *])

(;W[oh];B[ph];W[rg];B[ng]C[
* GOOD VARIATION *])
)

(;B[pg]
C[The combination of Black 11 and 13 was invented by Shimamura
Toshihiro, first played against Takagawa Kaku in game 5 of the
1956 Honinbo title.

White continues with 'a' to keep the right side or 'b' to enter
the top side and give the right side.]
LB[pb:b][pf:a]
(;W[pf];B[of]C['A' is correct, 'B' is only possible with the ladder.]
LB[ph:B][rg:A]
(;W[rg];B[og])

(;W[ph];B[qh];W[og];B[rg];W[pg];B[ng])
)

(;W[pb]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[ob:b][pf:a]
(;B[pf];W[ob];B[rg])

(;B[ob]C[Black 15 is a mistake.];W[pf];B[of];W[og];B[rg];W[qh];B[qb];
W[ph];B[rh];W[qi];B[rb];W[ri];B[rc];W[nf])
)
)
)

(;W[rg];B[rd];W[sf];B[rc];W[og]
C[This is only good, if Black 3 has now been severely damaged,
e.g. with strong White support on the lower right.]
LB[pi:3])
)

(;B[pf];W[pg];B[og];W[oh];B[ph];W[qb];B[ng])
)

(;W[rg];B[pf];W[pg];B[og];W[oh];B[ph];W[qg];B[ng]
C[
* GOOD VARIATION *])
)
)

(;W[of]C['A *' is joseki, 'B' is possible.
'C'  is not recommended.]
LB[nc:C][qe:B][nd:A]
(;B[nd]
C[When Black has no extension at top.

White continues with 'a *' or 'b *'.
'c' is bad.
]
LB[qc:b][rd:a][qd:c]
(;W[rd];B[qc]
C[White continues with 'a *'. Playing elsewhere ('b') is a mistake.]
LB[dp:b][ri:a]
(;W[ri]
C[
Catenaccio
------------

Traditionally seen as * GOOD VARIATION *, the result is oftenly considered favorable for Black, because White is too low. The joseki is only ok, if used to reduce a big moyo.

Black plays 'a' if there is no extension, or 'b' if Black already
has an extension at top.

Catenaccio is Italian, means "lock" and refers to football strategy of putting all forces into defense to avoid opponents' goals.
]
LB[mf:b][jc:a]
(;B[jc]
C[White continues with 'a'. 'b' shows the result of White playing
elsewhere. White 'c' is not good.
]
LB[dp:b][qi:a][ni:c]
(;W[qi]
C[Continuation.

The large knight's move is thin, so White 10 is worth devoting
a move to.])

(;W[tt]C[Black continues at 'a' or 'b'.]LB[qg:b][pg:a]
(;B[pg];W[pf]
C[Black plays 'a' to block White from the lower right side, or
'b' to split White into two groups.]
LB[rj:b][rh:a]
(;B[rh]C[Black aims to seal White off from the lower right side.];
W[qh];B[qi];W[rg];B[rj];W[sh])

(;B[rj]
C[Black aims to separate White into two groups.

Fighting spirit dictates White continues with 'a'. White 'b'
is painfully submissive.]
LB[rh:b][qj:a]
(;W[qj];B[qi];W[rk];B[rh];W[sj];B[qg])

(;W[rh];B[qj])
)
)

(;B[qg];W[rg];B[rf]
C[Black 12 is a tesuji.

White must decide how best to continue. White 'a' gives away
the corner.]
LB[pg:a];W[pg];B[qe]C[Black takes the corner.])
)

(;W[ni];B[pk];W[nk];B[pg];W[pf]LB[nh:A][rh:B]
C[Black can now select to cut on A or B.
])
)

(;B[mf]AB[jd]
C[Black plays 9 if there is already an extension as shown.])
)

(;W[tt]C[White cannot afford to play elsewhere.];B[pg];W[pf];B[qg];
W[rg]C[White 11 is necessary, though it is submissive..];B[rh];W[rf];
B[rc];W[mf])
)

(;W[qc]
C[White 6 was invented by Kitani Minoru in 1956 (Kitani-Shimamura,
1956 2nd Top Position Tournament league).]
;B[qd];W[rd];B[re];W[rc];B[qe];W[ob];B[pg];W[pf];B[rg]
C[
* GOOD VARIATION *];W[ni]LB[nb:A]
C[Because of the aji of the White outside group, the attachment of Black A is not good.
])

(;W[qd];B[qc];W[rc];B[qe];W[rd];B[pe];W[re];B[pf]LB[of:4]
C[Now White 4 is wasted.
])
)

(;B[qe]
(;W[rf];B[nd])

(;W[rg];B[re];W[qj])
)

(;B[nc]
C[
If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.])
)

(;W[nc]C['A *' is joseki. 'B' is possible.
'C' is an easy variation.]
LB[oe:C][qc:B][pf:A]
(;B[pf]C[White continues with 'a' or 'b *'.]LB[qc:b][pg:a]
(;W[pg]C[White 6 is conventional.];B[of]
C['A' or 'B'. 'C' is a mistake.]LB[og:C][qe:B][qc:A]
(;W[qc];B[qe];W[pc]C['A', 'B' or 'C'.]LB[rd:C][og:B][rf:A]
(;B[rf]
C[Black can later play 'a' in sente, aiming at an attack at 'b'.]
LB[ob:b][lc:a];W[qg]C[Later this move doesn't work.];B[rg];W[qh];B[qi]
;W[rh];B[ri];W[sg];B[og];W[re];B[rd];W[sf];B[qd])

(;B[og])

(;B[rd];W[kc];B[pl])
)

(;W[qe]C['A' or 'B' are ok.]LB[nd:B][qd:A]
(;B[qd]C['A' or 'B'.]LB[pe:B][og:A]
(;W[og];B[nd];W[md]C['A' is correct, 'B' is disadvantageous.]
LB[oc:B][ng:A]
(;B[ng];W[od];B[pe];W[qh];B[ne]C['A' and 'B' are ok.]LB[nh:B][lc:A]
(;W[lc];B[qi];W[oh]C['A', 'B' or 'C' are ok.]LB[kd:C][jc:B][nj:A]
(;B[nj];W[nh];B[mg];W[mi];B[ob]
C[If necessary and sente, Black plays an extension to the lower
right before this move.]
;W[ic];B[pm])

(;B[jc]C['A' or 'B'.]LB[le:B][jd:A]
(;W[jd]C['A' is correct, 'B' is disadvantageous.]LB[id:B][mb:A]
(;B[mb];W[mc];B[id];W[je]
C['A' or 'B' give a position which is not bad for either Black
or White.]
LB[ie:B][kc:A]
(;B[kc];W[kd];B[hc];W[mf];B[me];W[le];B[mg];W[lf];B[nf];W[oi];B[pk]
C['A' if White is in the lower right, 'B' if Black is in the lower
right.]
LB[mi:B][pb:A]
(;W[pb];B[mi];W[oj]
C['A' if White is in the lower right, 'B' if Black is in the lower
right.]
LB[pl:B][qn:A]
(;B[qn];W[ok];B[pl];W[mk];B[kh])

(;B[pl])
)

(;W[mi])
)

(;B[ie];W[ic];B[hc];W[ib];B[jf];W[jb];B[kd]
C['A' is correct, 'B' is a mistake.]LB[ke:B][kc:A]
(;W[kc];B[ke])

(;W[ke];B[le];W[kf];B[kg];W[lf];B[mf];W[lg];B[lh];W[kc];B[mg];W[ld];
B[nj])
)
)

(;B[id];W[je];B[kc];W[kd];B[hc];W[oi];B[pk];W[pb])
)

(;W[le]
C['A' is correct.
'B' is ok, if Black can make an extension in sente on one of
both sides to come back to the other one.]
LB[nj:B][je:A]
(;B[je];W[pb];B[mh];W[oi];B[pk];W[oj];B[pl];W[mj];B[kh])

(;B[nj];W[nh];B[mg];W[mi];B[kg];W[je])
)
)

(;B[kd];W[kc];B[jd];W[ic];B[nj];W[nh];B[lg];W[mi];B[pm])
)

(;W[nh];B[mg];W[oi]C['A' is correct, 'B' is disadvantageous.]
LB[kc:B][mc:A]
(;B[mc]C['A' and 'B' are ok.]LB[mh:B][lc:A]
(;W[lc];B[mb];W[lb]C['A' is correct, 'B' is not recommended.]
LB[ld:B][nb:A]
(;B[nb];W[hc])

(;B[ld];W[ma];B[nb];W[kd];B[me];W[hc])
)

(;W[mh]C['A' is correct, 'B' and 'C' are disadvantageous.]
LB[lc:C][lg:B][lh:A]
(;B[lh]C['A' is correct, 'B' is questionable.]LB[li:B][lg:A]
(;W[lg]C['A' or 'B' are ok.]LB[kh:B][li:A]
(;B[li];W[lc];B[mb];W[ld];B[nb];W[kg];B[ji];W[hd])

(;B[kh];W[lc];B[mb];W[ld];B[nb]C['A' is correct, 'B' is a mistake.]
LB[kg:B][hd:A]
(;W[hd])

(;W[kg];B[jh];W[jg];B[ig])
)
)

(;W[li];B[ki];W[lj];B[kh])
)

(;B[lg];W[lc];B[mb];W[lb];B[ld];W[ma];B[nb];W[kd];B[me];W[hc])

(;B[lc];W[lg])
)
)

(;B[kc];W[pl];B[ke];W[kb]C[Later, White makes a ko.];B[lb];W[lc];B[ld]
;W[mb])
)
)

(;B[oc];W[ne];B[od];W[ng];B[mc];W[ld])
)

(;W[pe]C['A' or 'B'.]LB[od:B][oe:A]
(;B[oe];W[od];B[qg];W[rd];B[rc];W[re];B[qc];W[rg];B[qh];W[rh];B[ri];
W[sf];B[ob])

(;B[od];W[oe];B[nd];W[ne];B[md])
)
)

(;B[nd]
C['A' is correct, 'B' is a bit better for Black.
'C' is not recommended.]
LB[oc:C][qd:B][md:A]
(;W[md];B[oc];W[ne];B[od];W[rc];B[og];W[ic];B[kc]C[Later];W[kd];B[lc];
W[jd];B[mc])

(;W[qd];B[oc];W[qc];B[mc]
C[The triangled stone stops White from enlarging his group, a difference
from similar joseki.]
TR[pi])

(;W[oc];B[qd];W[od];B[pe];W[og];B[ng];W[qh];B[ld];W[md];B[le])
)
)

(;W[og];B[qe];W[qg];B[nf];W[ng];B[mf];W[qc];B[pc];W[pb];B[rf];W[rb];
B[rg]C[A and B are miai.]LB[ni:B][qh:A])
)

(;W[qc]
C[White 6 is a recent Korean innovation.

Black can block at 'A *' or at 'B'.]
LB[qe:B][pc:A]
(;B[pc]C['A' goes outside, 'B' takes the corner.]LB[qd:B][pg:A]
(;W[pg];B[qd];W[of];B[nd];W[ld])

(;W[qd]
C[Black can simply connect at 'a', which gives White the chance
to play a fast-paced fuseki. If Black wants to forestall that,
he can also wedge at 'b *'.]
LB[qe:b][pe:a]
(;B[pe];W[qe];B[qg]
C[White can now choose a fast-paced strategy at 'a'.
'b' emphasises territory to the top, 'c' to the right. Both give
simple results which are considered a little slack by some pros
or even by others.]
LB[rg:c][pb:b][jd:a]
(;W[jd];B[rg];W[pb];B[ob];W[qb];B[oc]
C[White now has sente again and can continue his fast-paced strategy.])

(;W[pb];B[ob];W[qb]C['A' or 'B'.]LB[oc:B][rg:A]
(;B[rg];W[oc];B[pl])

(;B[oc];W[jd];B[rg])
)

(;W[rg];B[rh];W[qh];B[pg];W[ri];B[ph];W[qi];B[kd])
)

(;B[qe];W[re];B[pe]
C[White 'a *', the connection, is the only choice. White 'b' gives
away the corner, while White 'c' leads to a painfully low position.]
LB[rg:c][qg:b][rf:a]
(;W[rf]
C['A *' is joseki. 'B' shows a complicated continuation.
Black 'C' presses the White corner.]
LB[pb:C][kc:B][jd:A]
(;B[jd]C[
* GOOD VARIATION *])

(;B[kc];W[pg];B[og];W[oh];B[ph];W[qg]
C[Black 'a' is a calm play leading to an even exchange. Black 'b'
is a mistake.]
LB[nh:b][ng:a]
(;B[ng];W[nh];B[mg];W[mh];B[lg];W[nj]
C[Black builds considerable thickness in exhange for White territory
with 'a'. Black 'b' is a tactic to complicate the situation and
start a fight in the center of the board.]
LB[pl:b][lh:a]
(;B[lh];W[pk])

(;B[pl])
)

(;B[nh];W[ng];B[oi];W[of]
C[Black has no defense against this powerful countertactic.])
)

(;B[pb]
C['a' disable Black to make a moyo on the top side, 'b' secures
the corner and gives Black the choice.]
LB[qb:b][jd:a]
(;W[jd]
C[Black 'a' takes away White's base. Black 'b' is not so good:
Black can't seal White in.]
LB[qg:b][rb:a]
(;B[rb]
C['a', 'b' or 'd'.
White 'c' leaves him with an inferior position.]
LB[ph:d][ri:c][pg:b][rh:a]
(;W[rh]C['a' is correct, 'b' is a mistake.]LB[ri:b][qg:a]
(;B[qg];W[qh]C['A' or 'B'.]LB[pg:B][ph:A]
(;B[ph];W[qj];B[qi];W[ri];B[rg];W[sg];B[pg];W[pj];B[oj];W[ok];B[pk];
W[nj];B[oi];W[qk];B[pl];W[ql];B[pm];W[qm];B[pn])

(;B[pg];W[qj];B[rg];W[sg];B[ph];W[pj];B[qi];W[rj];B[ri];W[si];B[oj];
W[ok]C[White can make good shape after 30.])
)

(;B[ri];W[ph];B[oh];W[qi];B[qj];W[qh];B[oi];W[rj];B[rk];W[si];B[qk])
)

(;W[pg];B[og];W[ph];B[oh];W[qi];B[qj];W[rh];B[ri];W[qh];B[pj]
C[White is sealed in.])

(;W[ri];B[qh];W[rh];B[qg];W[rg];B[qj]
C[White's position on the second line is painfully low.])

(;W[ph]C['A' is correct, 'B' is a mistake.]LB[qh:B][oh:A]
(;B[oh];W[qh];B[qi];W[ri];B[rj];W[rh];B[oi];W[pg];B[og])

(;B[qh];W[pg];B[qg];W[qi];B[oh];W[og];B[ng];W[of])
)
)

(;B[qg];W[rg];B[qh];W[qb])
)

(;W[qb]
C['A' makes a moyo on the top side, 'B' encloses to the right side.]
PL[2]LB[qg:B][kc:A]
(;B[kc];W[pg];B[og];W[oh];B[ph];W[qg];B[ng];W[nh];B[mg];W[mh];B[lg];
W[nj])

(;B[qg];W[jd];B[rg])
)
)
)

(;W[qg]C[White 12 is not recommended.];B[rf];W[rg];B[rd];W[sf];B[rc]
C[Black is satisfied to take the corner.])

(;W[rg]C[White 12 is not recommended, as White is too low.];B[qg];
W[rf];B[kc]
C[White is forced to play on the second line three times, after
which Black can play the ideal point of 15.])
)
)
)

(;B[qe];W[pc];B[qg]
C[Black's shape is a bit overconcentrated, so Black 9 is maybe
omitted.]
LB[qg:9])
)
)

(;B[qc];W[oe];B[od];W[nd];B[pf])

(;B[oe];W[qc];B[qd];W[pc];B[me])
)

(;W[nd];B[pf]C['A *' and 'B *' are joseki.]LB[qc:B][pg:A]
(;W[pg];B[of];W[qe]C['A *' is joseki, 'B' is a disastrous mistake.]
LB[qd:B][od:A]
(;B[od]C['A *' is joseki, 'B' is a mistake.]LB[og:B][rc:A]
(;W[rc];B[og];W[qg];B[ni]C[
* GOOD VARIATION *])

(;W[og];B[ng]
C[In the Tsuke-Nobi-joseki White 3 occupies the shape-point of
the White stones. So after White 11 White is pushed into the
bad empty triangle shape on 'A'. If here he tried to resist on
'B', the result is worse.]
LB[ng:11][og:10][pi:3][oi:B][oh:A]
(;W[oh])

(;W[oi];B[oh];W[qh];B[qd]
C[White has a small group. Black has anything else.])
)
)

(;B[qd]C[This is impossible after White 4.]LB[nd:4];W[pe];B[oe];W[od])
)

(;W[qc];B[pc]
C['A *' is joseki to keep the corner. 'B' is an inferior variation
to go outside.]
LB[pg:B][qd:A]
(;W[qd];B[qe];W[re];B[pe];W[rf];B[jd]
C[
* GOOD VARIATION *

After the joseki, White can attack on A, but must choose the
right time.]
LB[pg:A];W[pg];B[og];W[of];B[qb];W[rb];B[ob];W[mc];B[ra];W[rc];B[nf];
W[oe];B[nc])

(;W[pg];B[qe];W[of];B[pe];W[og];B[rg])
)
)

(;W[qk]C['A' is possible. 'B' is not recommended.]LB[qe:B][pf:A]
(;B[pf];W[pg];B[of];W[qe];B[qd];W[og]
C['A' is possible, 'B' is not recommended.]LB[ng:B][qh:A]
(;B[qh];W[qg];B[nd];W[mg];B[oj])

(;B[ng]C['A' is correct, 'B' depends on a ladder, 'C' is an overplay.]
LB[ok:C][qi:B][qh:A]
(;W[qh]C['A' is necessary, 'B' is a mistake.]LB[qi:B][nd:A]
(;B[nd];W[qi]C[Now Black 3 is just heavy.]LB[pi:3])

(;B[qi];W[pe];B[oe];W[od]C[The cut works now,])
)

(;W[qi]
C['A' is correct without the ladder, 'B' is best with the ladder,
'C' gives up the corner.]
LB[qh:C][qg:B][nd:A]
(;B[nd];W[qh])

(;B[qg];W[qh];B[rg];W[rf];B[ph]
C['A' with the ladder leads to Black's destruction. If White doesn't
have the ladder, he plays 'B' and connects, while Black gets
overwhelming thickness.]
LB[sg:B][oh:A]
(;W[oh])

(;W[sg];B[rh];W[ri];B[oh];W[sh])
)

(;B[qh];W[qg];B[ri];W[pe];B[oe];W[od])
)

(;W[ok]
C['A' is correct and creates much influence, 'B' depends on the
ladder, 'C' is slow.]
LB[nh:C][qg:B][nd:A]
(;B[nd]C['A' connects the White stones, 'B' and 'C' don't.]
LB[qi:C][qh:B][oi:A]
(;W[oi];B[qh];W[qg]
C['A' tales influence, 'B' takes away the base of the White group.]
LB[qj:B][oj:A]
(;B[oj];W[pj];B[oh]C['A' or 'B'.]LB[ph:B][ni:A]
(;W[ni];B[ph];W[rh];B[nh];W[ri];B[qj];W[pk];B[qi];W[rj];B[mi];W[nj])

(;W[ph];B[ni];W[qi];B[nk])
)

(;B[qj])
)

(;W[qh];B[qi];W[oi];B[oh];W[ph];B[nh];W[ri];B[rh];W[qg];B[rj];W[qj];
B[si];W[pj];B[ri];W[rg];B[ni];W[oj];B[re];W[rk];B[pe];W[sk];B[rf])

(;W[qi];B[qh];W[qg];B[ri];W[qj];B[ph];W[rh];B[rg];W[sh];B[sg];W[oh];
B[oi];W[ni];B[nh];W[oj];B[si];W[rh];B[sh];W[pj];B[rh];W[rj];B[re];
W[sj];B[rf])
)

(;B[qg];W[qh];B[rg];W[rh];B[ph];W[oh])

(;B[nh];W[qh]C['A' is correct, 'B' gives up the corner.]LB[qi:B][nd:A]
(;B[nd];W[qi])

(;B[qi];W[pe];B[oe];W[od];B[nd];W[oc];B[nc];W[pb];B[nb];W[rb];B[rd];
W[pc];B[rg];W[qg];B[rh];W[se];B[re];W[rf];B[sd];W[sc];B[sf];W[rc];
B[sg];W[qc];B[se];W[ri])
)
)
)
)

(;B[qe];W[pf];B[nd];W[ng])
)
)

(;B[pj]
C[
Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia = 3-Space High Pincer
-----------------------------------------------------------------------------

Black may play this way with a san-ren-sei at top, in which case
White may enter the corner at 'a'. 

The double approach moves of 'b' or 'c' and 'd' are also possible.
]
LB[qh:d][nd:c][nc:b][qc:a]
(;W[qc]C[Black continues with 'a' or 'b'.]LB[qd:b][pc:a]
(;B[pc]AB[jd][dd]C[Black 5 is appropriate given Black support at top.]
;W[qd];B[pe];W[rg])

(;B[qd];W[pc];B[od];W[rd];B[re];W[rc];B[qe];W[nc];B[nd];W[mc];B[md])
)

(;W[nc]
C[Traditional joseki continues with Black 'a'. Black 'b' and 'c'
may be playable as well.]
LB[nd:c][oe:b][pf:a]
(;B[pf]
C[White 'a' is traditional joseki. White 'b' is a new line of play.]
LB[qc:b][pg:a]
(;W[pg];B[of]C[White continues with 'a' to 'd'.]
LB[re:d][qe:c][qc:b][qd:a]
(;W[qd];B[qe];W[re];B[pe]
C[White continues with 'a'. White 'b' is not recommended, but is
good with an additional White stone on the triangled position.]
LB[rg:b][rd:a]TR[qn]
(;W[rd]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qc:b][qg:a]
(;B[qg];W[rf]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qh:b][oc:a]
(;B[oc]
C[Black 15 is the best way to keep White from connecting.

White continues with 'a'. White 'b' is an overplay in the face
of Black thickness.]
LB[nd:b][qh:a]
(;W[qh];B[og];W[ph]
C[Black has influence, White territory. The result is considered
equal.

Black continues with an extension at top.

Black can later exchange 'a' for 'b'.]
LB[ri:b][qi:a])

(;W[nd]
C[White 16 is a mistake. The two White stones are heavy in front
of such Black thickness.])
)

(;B[qh]C[Black 15 is a mistake.];W[pc]
C[White is connnected, and White's profit exceeds Black influence.])
)

(;B[qc]C[Black 13 is a mistake. White can even later cut at the X.]
MA[pc];W[qg];B[og];W[rj]C[Black 3 has lost effectiveness.])
)

(;W[rg]
C[White 12 is not recommended, except when there is an additional
White stone on the triangled position.]
TR[qn];B[qc];W[rd];B[og];W[ph];B[oh]C[Black 3 is well placed.];AW[qn];
W[pi];B[oi];W[qj];B[qk]C[This stone is wrong now.];W[pk];B[oj];W[ql];
B[rk];W[rj])
)

(;W[qc];B[qe];W[pc]
C[Locally, Black continues with 'a' to 'c'. Black may also play
elsewhere.]
LB[lc:c][og:b][rf:a]
(;B[rf])

(;B[og])

(;B[lc])
)

(;W[qe];B[qd]C[White continues with 'a' or 'b'.]LB[oi:b][qh:a]
(;W[qh];B[oc];W[nd];B[od]
C[Black has follow-up moves at 'a' to 'c', but White should first
extend on the top.]
LB[jd:c][jc:b][ri:a];W[kd]C[White 14 is a likely continuation.])

(;W[oi];B[oc];W[oj];B[pk]C[White still lacks settled shape.])
)

(;W[re]
C[This gives the same result as variation 'a', but with a different
order of moves.]
;B[qe];W[qd];B[pe]
C[For the continuations see the variation where White 10 is played 
before White 8.]
LB[qd:10][re:8])
)

(;W[qc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qe:b][pc:a]
(;B[pc];W[qd]C[Black continues with 'a' or 'b'.]LB[pe:b][qe:a]
(;B[qe];W[re];B[pe];W[rf]
C[Black has imperfect thickness (the pincer is too far, and White
4 has considerable aji), while White has meager territory.])

(;B[pe];W[qe];B[qg];W[jc]
C[White may prefer a two-space extension instead of three, depending
on the board position.])
)

(;B[qe]C[Black 7 is a mistake in direction.];W[pc];B[qg])
)
)

(;B[oe]C['A' or 'B'.]LB[of:B][qc:A]
(;W[qc];B[qd];W[pc]
C[Just looking at the current position (tewari analysis), Black
5 would be better placed at the 'x'. Further, a White play at
'x' presents a problem for Black.

Black continues with 'a'. Black 'b' is too mild.]
LB[me:b][md:a]MA[od]
(;B[md]C[White continues with 'a' to 'd'.]LB[mc:d][rd:c][nd:b][od:a]
(;W[od]
C[Black continues with 'a', or, to create thickness in sente (by
sacrifice), 'b'.]
LB[pf:b][pe:a]
(;B[pe]C[White continues with 'a' or 'b'.]LB[ne:b][rd:a]
(;W[rd];B[re];W[rc]
C[Black continues with 'a'. Black 'b' makes a bad shape.]
LB[qe:b][pg:a]
(;B[pg]C[Black has thickness, keeping to the original strategy.])

(;B[qe]C[Black 15 is a mistake. Black has bad shape.];W[ne];B[nd];
W[oc];B[le];W[nf];B[pg];W[og];B[qg])
)

(;W[ne]C[White 12 displays an aggressive style.];B[nd];W[oc]
C[Black continues with 'a'. Black 'b' is an overplay.]LB[le:b][pg:a]
(;B[pg];W[nf]
C[The fight begins.

Black continues with 'a'. Black 'b' is also seen in professional
play.]
LB[rc:b][le:a]
(;B[le];W[nh]
C[White 18 is a possible continuation. The fight continues from
here.])

(;B[rc]C[Black 17 is a greedy move.];W[rd];B[re];W[ld];B[mc];W[lc];
B[me];W[mb];B[le];W[mg];B[sd];W[kb];B[kf];W[kh];B[if])
)

(;B[le]C[Black 15 is an overplay.];W[rd];B[pg];W[re];B[nf]
C[White has undermined Black's position in sente. This is a White
success.])
)
)

(;B[pg]
C[Black 11 initiates a sacrifice sequence to build thickness in
sente.]
;W[pe];B[nd];W[oc];B[pf];W[qe];B[qg];W[rg];B[rd];W[re];B[se];W[rf];
B[rh];W[rc])
)

(;W[nd];B[ne];W[me]C[Black continues with 'a' or 'b'.]LB[mc:b][kd:a]
(;B[kd]C[White continues with 'a'. White 'b' is a mistake.]
LB[ld:b][mf:a]
(;W[mf];B[mc];W[mb];B[lb];W[nb];B[og];W[kf];B[id])

(;W[ld]C[White 14 is a mistake.];B[le];W[mc];B[mf];W[ke];B[md];W[lc]
C[White is not likely to have a large enough ko threat, so must
submit.]
;B[id])
)

(;B[mc];W[mb];B[kd];W[le];B[lb];W[nb];B[jd];W[mg];B[og])
)

(;W[rd]C[White 10 leaves the shape at top unresolved.];B[re];W[rc];
B[pg]AB[jp][pp]AW[dd][dp][hq]
C[This shows a position in a professional game between Rin Kaiho
(Black) and Kobatashi Koichi (White).

White could play 'a', forcing Black 'b', but that would preclude
pushing at c and cutting. White may reserve further play locally.
The possibility of Black 'd' remains, so there is a tradeoff
to White playing elsewhere.]
LB[oc:d][nd:c][pe:b][od:a])

(;W[mc]
C[White 10 is submissive, but may be acceptable from a whole-board
perspective.]
;B[ld]
C[Black's shape still has defects at 'a' and 'b' that White may
exploit later.]
LB[od:b][nd:a])
)

(;B[me]C[Black 9 is too mild; Black should press White.])
)

(;W[of];B[nf];W[og]
C['A' starts a fight, 'B' aims to build influence by pressing down
White on the top side.]
LB[qe:B][qc:A]
(;B[qc];W[ne]C['A' is correct, 'B' is a mistake.]LB[nd:B][mf:A]
(;B[mf];W[me];B[lf];W[kd];B[ni])

(;B[nd];W[me];B[md];W[ld])
)

(;B[qe];W[rf];B[md];W[lc];B[kd];W[ld];B[le];W[ke];B[jd];W[kb];B[lf];
W[ic];B[id];W[hc];B[hd];W[gc];B[fe])
)
)

(;B[nd]
C[Black 5 is not traditional joseki, and so is best considered
a special strategy, but may be playable with a Black position
at the upper left.]
;W[md];B[ne];W[oc]
C[Black continues with 'a'. Black 'b' is not recommended, as it
gives away too much territory.]
LB[pe:b][pc:a]
(;B[pc]
C[White continues with 'a'. White 'b' and 'c' are not recommended.]
LB[pg:c][od:b][jc:a]
(;W[jc];B[pf])

(;W[od]C[Without support at top, White 10 is at best premature.];B[pe]
;W[oe];B[pf];W[of];B[pg]
C[White must now extend towards the top, but the aji of the two
Black stones and the cutting point present problems for White.]
MA[mc])

(;W[pg]
C[White 10 is not recommended, as White is thin in two places.

Black continues with a sacrifice play at 'a'. Black 'b' is weak.]
LB[qe:b][mc:a]
(;B[mc]
C[Black 11 is a sacrifice to build strength to attack the two White
stones at right.]
;W[lc];B[mb];W[lb];B[me];W[ld];B[od];W[nb];B[ob];W[ma];B[oh]
C[White can only try to live underneath, giving Black great strength
on the outside.])

(;B[qe]
C[Black 11 allows White's splitting maneuver to work.

White continues with 'a'. White 'b' is a bit slow, but puts more
pressure on Black 3.

White 'c' is not recommended as being too low, and giving Black
influence unnecessarily.]
LB[re:c][oh:b][ng:a]
(;W[ng])

(;W[oh]
C[White 12 is a bit slow, but may be effective given the whole
board situation. White 12 puts a bit more pressure on Black 3
than jumping up from White 10.])

(;W[re]
C[White 12 is not recommended, even though White can easily live.];
B[pf]C[White continues with 'a'. White 'b' is a mistake.]
LB[rf:b][qd:a]
(;W[qd];B[pe];W[rg]C[Black cannot capture White 14.];B[og];W[ph];B[oh]
;W[pi];B[oi];W[qj];B[qk];W[pk];B[oj];W[rj]
C[White 26 ends in White sente, as Black must do something about
the cut of White 24.]
;B[ql];W[kc])

(;W[rf]C[White 14 is cowardly.];B[rd];W[of];B[pe];W[og]
C[White is at a significant disadvantage as Black torments White
while making territory and influence.]
;B[mg];W[nh];B[nj];W[mh];B[me];W[ld];B[kf])
)
)
)
)

(;B[pe]
C[Black 9 leaves the corner open, which Black must then defend
in gote.]
;W[qb];B[qc];W[rb];B[rc];W[pc];B[qd];W[ic]
C[White 16 may also be played one line closer to White's stones.];
B[oh])
)
)

(;W[nd]LB[ne:A][pf:B]C['A' or 'B' are ok.
]
(;B[ne];W[me];B[oe];W[qc];B[qd];W[od];B[pf];W[pc];B[rc];W[rb];B[rd])

(;B[pf];W[pg];B[of];W[qe];B[od]
C[White continues with 'a', possibly 'b'.]LB[rc:b][og:a]
(;W[og]
C[White 10 pushes to the center so as not to give too much thickness.]
;B[qd]C[The only move.];W[mg];B[ng];W[nh];B[nf];W[oi])

(;W[rc]
C[White 10 is a classic move, but yields much thickness to Black.];
B[og]C['A' is correct, 'B' is questionable.]LB[oh:B][ph:A]
(;W[ph];B[oh]C[Black 3 and 13 are working well together.])

(;W[oh];B[ph];W[qg];B[nh];W[oi];B[nj];W[pi];B[qi];W[qh];B[ni];W[qj];
B[oj];W[ri]C[Black built a lot of thickness in sente.])
)
)
)

(;W[qh];B[qe];W[pf];B[nc];W[rj])
)

(;B[oe]AB[jd]
C[
Kosumi = Ibkucha = Jian = Diagonal
-----------------------------------

Black 3 is an invention of Takemiya Masaki. The move only makes sense
with a Black supporting stone as shown, as part of a moyo strategy.
]
;W[qc]
C[White naturally takes profit.
'A' and 'B' are both correct and build a wall to the top. After
'B', that wall is stronger.]
LB[qd:B][pc:A]
(;B[pc];W[qd];B[pg]
C[Black 7 continues moyo strategy. White continues with 'a' for
territory or 'b' to provoke a fight.
Tenuki 'c' is not recommended.]
LB[dp:c][pf:b][qg:a]
(;W[qg];B[ph])

(;W[pf];B[of];W[og];B[qg];W[rg];B[rh];W[rf];B[pi]
C[While Black may have influence, White should not be at a disadvantage
in the coming fight.])

(;W[dp];B[qg]C[Black forces in sente.];W[rf])
)

(;B[qd]C[This move is recommended by Takemiya Masaki.];W[pc]
C['A' is correct. 'B' is a mistake and builds the wall to the wrong
direction..]
LB[oc:B][nc:A]
(;B[nc]
C['A' or 'B'. With 'B', White wants to lure Black into taking gote.]
LB[rd:B][nb:A]
(;W[nb];B[mb];W[ob];B[mc];W[rd];B[re];W[rc]
C[Black takes sente by playing tenuki 'A' as he has his wall to
the top. In the rare case of no more big point on the board,
he can play 'B'.]
LB[qe:B][dp:A]
(;B[dp])

(;B[qe])
)

(;W[rd];B[re];W[rc]
C['A' to take sente. After 'B', Black ends up in gote.]LB[qe:B][oc:A]
(;B[oc];W[qe])

(;B[qe];W[nb];B[mb];W[ob];B[mc])
)
)

(;B[oc];W[ob];B[nc];W[nb];B[mc];W[rd];B[re];W[rc];B[qe])
)
)

(;B[of]
C[
Takageima (high knight's cap)
-------------------------------

Black 3 is played with an extension at top, such as marked.

White continues with 'a', 'b', 'e', or possibly 'd'.

White 'c' is a trick play.
]
LB[og:e][rd:d][nc:c][ph:b][qc:a]MA[jc]
(;W[qc]AB[jc]C['A' is correct. 'B' is a mistake.]LB[qd:B][pc:A]
(;B[pc];W[qd];B[pe];W[rg];B[je])

(;B[qd];W[pc];B[oc];W[ob];B[nc];W[rd];B[re];W[rc];B[qe];W[nb];B[mc]
C[Black has not used the marked stone.]TR[jc])
)

(;W[ph];B[qe];W[pf]C['A' is correct, 'B' is a mistake.]LB[pe:B][oe:A]
(;B[oe];W[qc];B[pc];W[re];B[qd];W[rd];B[rc])

(;B[pe];W[og];B[nf])
)

(;W[nc]
C[White 4 is a trick.

Black 'a' is best. Black 'b' gives an equal result.
Black 'c', 'd', and 'e' are mistakes.]
LB[nd:e][oe:d][pe:c][qe:b][qc:a]
(;B[qc]
C[Regardless of White's next move, Black 'a' or 'b' are good follow-up
moves.]
LB[ph:b][md:a])

(;B[qe];W[qc];B[pc];W[pb];B[rf];W[rb];B[qg])

(;B[pe]
C[Black 5 is a mistake. If Black was worred about being overextended,
the capping move of Black 3 was not a good idea.]
;W[qc];B[pc];W[pb];B[ob];W[qb];B[oc];W[re])

(;B[oe]C[Black 5 is the same mistake as the previous variation (c).];
W[qc];B[pc];W[qd])

(;B[nd]C[Black 5 is a mistake.];W[md];B[oc];W[ne];B[od];W[mc];B[ph]
C[Black 11 is a possible continuation.];W[qh]
C[White can also slide into the corner at the marked spot.]CR[rd])
)

(;W[rd]AB[jc]C[White slides to settle his shape.];B[qc];W[ph];B[je])

(;W[og];B[ng]C['A' is possible, 'B' is questionable.]LB[pg:B][oh:A]
(;W[oh];B[pf];W[qg];B[qe];W[qj])

(;W[pg];B[nh];W[nf];B[oe];W[mf];B[md])
)
)

(;B[pg]C[
Kata-tsuki = Shoulder Hit
--------------------------
];W[pf]
;B[of]C['A' or 'B'.]LB[og:B][oe:A]
(;W[oe];B[pe];W[og];B[nf];W[ph];B[ng];W[qg]
C['A' is correct, 'B' is disadvantageous.]LB[re:B][nd:A]
(;B[nd];W[rd])

(;B[re];W[oc]C['A' or 'B'.]LB[pc:B][od:A]
(;B[od];W[ne];B[nd];W[me];B[nc];W[nh])

(;B[pc];W[od])
)
)

(;W[og];B[ph];W[oe];B[nf];W[pe];B[qd];W[od];B[oc];W[nc];B[ob];W[me];
B[nb];W[oh];B[oi];W[mg];B[oj];W[mi])
)

(;B[jd]C[White continues with 'a', 'b' or 'c'.]LB[qc:c][md:b][nc:a]
(;W[nc]LB[nd:A][pf:B]C['A' is ok, 'B' is old-fanhioned.
]
(;B[nd]LB[qc:A][md:B]C['A' or 'B'.
]
(;W[qc];B[oc];W[qd];B[mc])

(;W[md];B[ne];W[pc];B[oc];W[ob];B[od];W[mb];B[qc];W[pb];B[lc];W[mc];
B[qe])
)

(;B[pf];W[pg];B[of];W[qc];B[pc];W[qd];B[qe];W[re];B[pe];W[rg])
)

(;W[md];B[pf];W[pg];B[of];W[qe];B[qd]
C[White continues with 'a' or the trick play of 'b'.]LB[rd:b][pe:a]
(;W[pe];B[oe];W[od];B[nd];W[oc];B[rd];W[qh];B[nc]
C[White continues with 'a', or the trick play at 'b'.]LB[pc:b][ob:a]
(;W[ob];B[nb]
C[White continues with 'a', sacrificing the three White corner
stones, or 'b' to try trick Black.]
LB[qb:b][ne:a]
(;W[ne];B[nf];W[me];B[pb];W[mg];B[lc])

(;W[qb]C[White 20 is a trick play.];B[rb];W[ra]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[sb:b][me:a]
(;B[me]C[White continues with 'a' or 'b'.]LB[sb:b][rc:a]
(;W[rc];B[pb]C[White continues with 'a' or 'b'.]LB[pc:b][pa:a]
(;W[pa];B[pc];W[oa];B[na];W[qa];B[sb])

(;W[pc];B[qc];W[pa];B[sc];W[re];B[na];W[oa]
C[The corner can be regarded as seki, unless someone starts a ko
by playing at the 1-1 point.

Black sente and the Black hane at 23 makes this a favorable result
for Black.])
)

(;W[sb];B[rc];W[re];B[sc]
C[The ko is not important: the hane of Black 23 is sufficient profit,
according to Yoshio Ishida.])
)

(;B[sb]C[Black 23 is a mistake; Black has been tricked.];W[ne];B[nf];
W[me];B[lc];W[mg];B[pb];W[pc];B[qc];W[pa];B[na];W[oa];B[sa];W[mc];
B[qa];W[mb];B[pb];W[mf]
C[White has great thickness, and Black is sealed in. This is a
success for White.])
)
)

(;W[pc]
C[White 18 is a trick play. Black continues with 'a'. Black 'b'
and 'c' are mistakes.]
LB[nb:c][qb:b][qc:a]
(;B[qc];W[nb];B[mc];W[qb];B[rb];W[mb];B[lc];W[pb];B[ra];W[lb];B[kc];
W[oa]
C[Black continues with 'a'. Black 'b' to save the corner stones
looks necessary, but is not.]
LB[sc:b][mf:a];B[mf];W[sc]
C[White 32 attempts to kill the Black corner stones.];B[re];W[rf]
C[White must play 34 to prevent Black from playing there.];B[sb];W[se]
;B[rc];W[sd];B[sf];W[se];B[sd])

(;B[qb]C[Black 19 is a mistake.];W[ne];B[nf];W[me];B[nb];W[mg];B[qc];
W[mf];B[ob]
C[Black is worse off than in the result of the main variation, 
where White doesn't try the trick play move of 18 and Black connects 
to Black 3 with a stone at the marked location.]
LB[pc:18][jd:3]MA[lc])

(;B[nb]C[Black 19 is a mistake.];W[qc];B[rc];W[rb];B[qb]
C[Black must fight a ko, which is a disadvantgeous result for Black.];
W[pb];B[ra];W[qa];B[sb];W[sa])
)
)

(;W[rd]
C[White 10 is a trick play.

Black continues with 'a'. 'b' is a mistake.]
LB[od:b][rc:a]
(;B[rc];W[pe];B[oe];W[od]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[re:b][qg:a]
(;B[qg]C[White continues with 'a' or 'b'.]LB[rg:b][re:a]
(;W[re];B[oc]C[White continues with 'a'. White 'b' is a mistake.]
LB[nd:b][qh:a]
(;W[qh];B[nd])

(;W[nd]C[White 18 is a mistake.];B[rg]
C[Black captures the 5 White stones.])
)

(;W[rg];B[qh];W[rh]C[Black continues with 'a' or 'b'.]LB[re:b][qi:a]
(;B[qi];W[ri];B[qj];W[re]
C[Black continues with 'a' to live in the corner, or 'b' for outside
influence.]
LB[nd:b][oc:a]
(;B[oc]C[Black for corner territory.];W[nd]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[qb:b][rb:a]
(;B[rb];W[ng]C[White 26 starts a difficult fight for Black.];B[og];
W[oh]C[A classic squeeze play.];B[nh];W[nf];B[ph];W[oi]
C[Further, White 'a' is sente against the Black corner group.]LB[mb:a])

(;B[qb]
C[If Black plays 25 here, it leaves aji for White to play 'a' later
and reduce Black to one eye.]
LB[pc:a];W[pc]AW[mb]C[White can play 26 with support as shown.];B[qc];
W[ob];B[pb];W[nb]C['a' and 'b' are miai, and Black dies.]
LB[sb:b][ra:a])
)

(;B[nd]C[Black sacrifices the corner for influence.];W[oc];B[nc];W[qc]
;B[ob];W[pc];B[me]
C[The result is considered clearly favorable for Black, as Black's
thickness is superior to White's 20 points in the corner.])
)

(;B[re];W[rf];B[sd];W[qi];B[nd]
C[With the White stone captured, White's extending to 'a' is fruitless.]
LB[oc:a];W[og];B[me]C[Black gets a favorable result.])
)
)

(;B[re]C[Black 15 is a mistake.];W[qg]C[Black may try 'a' or 'b'.]
LB[oc:b][nd:a]
(;B[nd];W[oc];B[nc];W[qc])

(;B[oc];W[nd];B[nc];W[mg]C[Black's three stones are trapped.])
)
)

(;B[od]C[Black 11 is weak: Black has tricked himself.];W[rc])
)
)

(;W[qc];B[pc];W[qd];B[pe];W[pf];B[qe];W[re];B[rd];W[rc];B[rf];W[sd];
B[of];W[og];B[ng];W[ph];B[nf];W[nh];B[mh];W[ni];B[mi];W[nj];B[mj];
W[nk])
)

(;B[tt]
C[
Tenuki
-------

Black plays elsewhere.

White continues with 'a' or 'd'. White 'b' is a trick. White
'c' is also possible. 'e'.
]
LB[qj:e][of:d][qc:c][qd:b][nc:a]
(;W[nc]
C[Black continues with 'a' or 'c'. 'b' shows Black playing elsewhere.]
PL[2]LB[pf:c][cq:b][oe:a]
(;B[oe];W[qc]C['A' to take a side or 'B' for a center moyo.]
LB[md:B][qd:A]
(;B[qd];W[pc];B[md]C['A' is correct, 'B' is inferior.]LB[nd:B][od:A]
(;W[od];B[pe];W[rd];B[re];W[rc]C['A' is correct, 'B' is a mistake.]
LB[qe:B][pg:A]
(;B[pg]C[Later, White activates White 2 on 'A', not on 'B'.]
LB[qf:2][qe:B][rf:A]
(;W[rf];B[qe];W[se];B[qg])

(;W[qe]
C[White 16 is wrong, because Black can make a border of his territory
in sente unto the second line by sacrificing another stone on
'A'. 'B' is wrong.]
LB[qe:16][qg:B][rf:A]
(;B[rf];W[qg];B[qh];W[rg];B[rh];W[se];B[pf];W[sf])

(;B[qg];W[rf];B[rg])
)
)

(;B[qe];W[ne];B[nd];W[oc];B[le];W[nf];B[pg];W[og];B[pf];W[lg])
)

(;W[nd];B[ne];W[me];B[kd];W[mf];B[mc];W[mb];B[lb];W[nb];B[og];W[kf];
B[hc];W[li];B[pj])
)

(;B[md];W[qd];B[pg];W[qg];B[ph])
)

(;B[tt]C[Black plays elsewhere.
'A *' or 'B'.]LB[qc:B][oe:A]
(;W[oe]
C[A go proverb states: "in a symmetrical position, play in the
center", but that is not the case here.

Wu Qingyuan = Go Seigen insists Black 'a' is the best move. Black 'b *' also
gives life.]
LB[qc:b][oc:a]
(;B[oc]
C[White 'a' seals Black in. White 'b' results in an exchange, with
Black getting out on the right.]
LB[od:b][nb:a]
(;W[nb];B[re];W[rf];B[od];W[nd];B[ob]
C[
If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.])

(;W[od];B[qe];W[pc];B[qc];W[ob];B[rf];W[rg];B[qg];W[pf];B[rh];W[re];
B[sg];W[rd])
)

(;B[qc];W[pb]
C[Black continues with 'a *'. Black 'b *' is less favorable.]
LB[qb:b][qe:a]
(;B[qe]C['A' or 'B *'.]LB[rf:B][re:A]
(;W[re];B[pe];W[pf];B[rd];W[rf];B[pc];W[ob];B[qb])

(;W[rf];B[qb];W[pc];B[od];W[nd];B[pe];W[pf];B[re]
C[
* GOOD VARIATION *];W[rd];B[se];W[rb];B[ra];W[rc];B[qd];W[sc];B[sb]
;W[sa];B[qa]C[Black lives.])
)

(;B[qb];W[pc];B[re];W[qe];B[qd];W[rf];B[od];W[nd];B[pa];W[mb];B[sd];
W[qa]
C['A *' is correct and brings life, 'B' is wrong and leads to death.]
LB[ra:B][rb:A]
(;B[rb]C[Neither 'A *' or 'B' kill.]LB[oa:B][sf:A]
(;W[sf];B[sc]C[
* GOOD VARIATION *])

(;W[oa];B[ra];W[sf];B[rd])
)

(;B[ra];W[sb];B[rb];W[sf];B[sc];W[rd])
)
)
)

(;W[qc];B[pf];W[pg];B[qe])
)

(;B[pf];W[pg]
C['A' or, with an additional stone on the triangled position, 'B'.]
LB[of:B][qe:A]TR[pj]
(;B[qe];W[of];B[pe];W[qg];B[nd];W[md];B[ne];W[ob];B[pb];W[pc];B[qc];
W[oc]C[Black continues with 'a', possibly 'b'.]LB[kd:b][qb:a]
(;B[qb]
C[White 19 is the obvious continuation for a solid base in the
corner.]
;W[re];B[rd];W[jc])

(;B[kd]C[Black 19 is feasible with support at the top left.];W[qb];
B[rb];W[pa];B[rd];W[kc]
C[White 24 is one possible continuation. White must play locally
to settle the group.]
;B[jc]C[White continues with 'a' or 'b'.]LB[lc:b][kb:a]
(;W[kb])

(;W[lc])
)
)

(;AB[pj];B[of]C['A' is correct, 'B' is inferior.]LB[qc:B][qd:A]
(;W[qd];B[qe];W[re];B[pe];W[rg];B[qc];W[rd]PL[1]LB[qh:A][og:B]
C['A' or 'B'.
]
(;B[qh];W[qg];B[oc])

(;B[og];W[ph];B[oh];W[pi];B[oi];W[qj];B[qk];W[pk];B[oj];W[rk];B[ql];
W[rl];B[qm];W[rm];B[qn];W[jc])
)

(;W[qc];B[qe];W[pc];B[og])
)
)
)

(;W[qd]C[White 3 is a trick play.];B[qc]
C['A' is correct, 'B' an overplay.]LB[pc:B][rc:A]
(;W[rc];B[pc];W[re];B[ld])

(;W[pc]
C['A' punishes the White overplay, 'B' and 'C' fail to do so. Black
'D' is a mistake.]
LB[od:D][qe:C][oc:B][qb:A]
(;B[qb]C['A', 'B' or 'C'.]LB[oc:C][pb:B][rd:A]
(;W[rd];B[oc])

(;W[pb];B[ob];W[oc];B[od];W[nc];B[qe])

(;W[oc];B[od];W[nd];B[oe];W[mc];B[qe])
)

(;B[oc];W[pb];B[qe];W[rd];B[od]C[White continues with 'a' or 'b'.]
LB[rc:b][ob:a]
(;W[ob];B[re];W[rc];B[pf])

(;W[rc];B[ob];W[qb];B[kc])
)

(;B[qe]C[Black 6 is not recommended. White gets good shape on top.];
W[rd];B[od];W[qb];B[re];W[rc];B[pf];W[nc])

(;B[od]C[Without supporting stones nearby, Black 6 is a mistake.];
W[qb];B[rc];W[rd];B[pb];W[oc];B[rb];W[nc])
)
)

(;W[qc]C[Black continues with 'a' or 'b'.]LB[pc:b][qd:a]
(;B[qd];W[pc]C[Black continues with 'a'. Black 'b' is an overplay.]
LB[oc:b][od:a]
(;B[od];W[rd];B[re];W[rc];B[qe];W[nc])

(;B[oc]C[Black 6 is a mistake.];W[rc]
C[White 7 is the only move.

Black continues with 'a', but, given the initial overplay, the
mistake of 'b' may be expected.]
LB[rd:b][od:a]
(;B[od];W[rd]C[White connects, and has no wasted stones.])

(;B[rd]C[White 8 is a mistake.];W[od]
C[Black continues with 'a'. A Black extension, such as 'b' (or
'c') is a mistake.]
LB[ob:c][nc:b][oe:a]
(;B[oe];W[nd];B[pf];W[nc])

(;B[nc]
C[Black 10 is a mistake. White captures the three Black stones.];W[pe]
;B[rf];W[re])
)
)
)

(;B[pc]AB[jd]C[Black plays 4 with support as shown.];W[qd];B[pe];W[qe]
;B[og];W[ph]
C[The continuation from here depends upon strategic considerations.])
)

(;W[of];B[nd];W[mf];B[ld];W[pk])

(;W[qj];B[ql]
C[These variations are included as Hoshi-Tenuki-Nirensei-variations.])
)

(;B[re]
C[
Hikui Keima = Low Knight's Move
----------------------------------

White continues with 'a' to 'd'. White should be prepared for
a fight with 'b' and 'c'.

White 'e' is a special strategy, not recommended.

White 'f' is an amateurish mistake.
]
LB[pc:c][nc:b][pj:a][rf:d][of:e][qe:f]
(;W[pj]C['A', 'B', 'C' or 'D'.]LB[pg:D][ph:C][of:B][qh:A]
(;B[qh]
C[White can emphasize the bottom right with 'a', or fight with
'b'.]
LB[rf:b][qj:a]
(;W[qj];B[of])

(;W[rf])
)

(;B[of])

(;B[ph]
C['A' takes territory in the corner.
'B' creates influence to the top side.
'C' takes small territories on both sides.
'D' is a disadvantageous way to build some territory on the right
side.]
LB[qh:D][nc:C][of:B][rf:A]
(;W[rf]C['A' is correct, 'B' is disadvantageous.]LB[pf:B][rh:A]
(;B[rh];W[of];B[nh];W[qd];B[qc];W[qe]C['A' or 'B'.]LB[pc:B][rc:A]
(;B[rc];W[nd];B[ne]C['A' is correct, 'B' is a mistake.]LB[pc:B][me:A]
(;W[me];B[nf];W[pc];B[od];W[pb];B[nc];W[rb];B[qb];W[qa])

(;W[pc];B[pb];W[oc];B[oe];W[ob];B[qa];W[rd];B[rb])
)

(;B[pc];W[rc];B[rb];W[sb];B[rd];W[sc];B[ra];W[qb];B[pb];W[mf];B[md];
W[kf];B[mj])
)

(;B[pf];W[qe];B[pe];W[qd];B[qc];W[rc];B[rb];W[qb];B[pc];W[sb];B[qg];
W[rg];B[rh];W[ra])
)

(;W[of]C['A' or, with an additional stone on the top, 'B'.]
LB[nh:B][rf:A]
(;B[rf]
C['A' is correct, 'B' is only possible with additional strength
in the lower right..]
LB[oh:B][od:A]
(;W[od];B[oc];W[pc];B[pb];W[qc];B[qd]
C['A' is correct, 'B' and 'C' are disadvantageous.]
LB[nc:C][ob:B][nd:A]
(;W[nd];B[nc];W[mc];B[rc];W[ld])

(;W[ob];B[nc];W[qb];B[nb];W[pa];B[qg])

(;W[nc];B[ob];W[nd];B[qg];W[nb];B[qb];W[jc])
)

(;W[oh];B[oi];W[pi];B[qh]
C['A' -> White gets two weak groups, 'B' -> Black gets a huge territory.]
LB[ni:B][nh:A]
(;W[nh];B[ni];W[ok];B[mi];W[lg];B[ki])

(;W[ni];B[og];W[oj];B[ng])
)
)

(;AB[ic];B[nh];W[qh];B[pg];W[qg];B[pf];W[qe];B[pe];W[qd];B[qc];W[rc];
B[pb])
)

(;W[nc];B[oc];W[nd];B[pf];W[pg];B[og];W[qg];B[qe];W[qh];B[oh];W[qj];
B[ri];W[qi];B[of];W[jc])

(;W[qh];B[pg];W[qg];B[pf];W[qe];B[qd];W[pe];B[oe];W[pi];B[nf])
)

(;B[pg]C['A', 'B' and 'C' are disadvantageous.]LB[rf:C][qg:B][pf:A]
(;W[pf]C['A' is correct, 'B' is disadvantageous.]LB[of:B][qg:A]
(;B[qg];W[rf];B[rg];W[of];B[og]
C['A' takes small territory, 'B' a large influence to the top in
sente.]
LB[nf:B][rd:A]
(;W[rd];B[nf])

(;W[nf];B[sf];W[od];B[oc];W[nc];B[nd];W[md];B[oe];W[ne];B[od];W[mc]
C['A' is necessary, tenuki 'B' is bad.]LB[dp:B][ob:A]
(;B[ob])

(;B[dp];W[ob]C['A' is possible, 'B' is not.]LB[pb:B][qc:A]
(;B[qc];W[pb]C['A' is honte, tenuki 'B' is not recommended.]
LB[co:B][qb:A]
(;B[qb])

(;B[co];W[rd]C['A' or 'B'.]LB[rc:B][qe:A]
(;B[qe];W[rc]C['A' loses less than 'B'.]LB[rb:B][qb:A]
(;B[qb];W[rb]C['A' saves stones, 'B' loses stones.]LB[qa:B][qd:A]
(;B[qd];W[qa])

(;B[qa];W[qd];B[pe];W[pc];B[se];W[sd];B[sg])
)

(;B[rb];W[qb];B[sb];W[qd];B[sd];W[pc])
)

(;B[rc];W[qe];B[se];W[sd];B[sg];W[qd])
)
)

(;B[pb];W[qd]LB[rd:B][qe:A]
(;B[qe];W[pe];B[pc];W[rd];B[se];W[sd];B[sg];W[qb]
C[Neither 'A' nor 'B' help.]LB[pa:B][nb:A]
(;B[nb];W[pa];B[oa];W[qa];B[mb];W[lb])

(;B[pa];W[qc];B[nb];W[mb];B[oa];W[qa];B[rb];W[ma];B[sc];W[na];B[ra];
W[ob])
)

(;B[rd];W[qc]LB[rc:B][qe:A]
(;B[qe];W[pe];B[pc];W[qb])

(;B[rc];W[qb])
)
)
)
)
)

(;B[of]C['A' is correct, 'B' is disadvantageous, 'C' is a mistake.]
LB[oe:C][og:B][qg:A]
(;W[qg];B[og];W[qi];B[oe];W[ql])

(;W[og];B[qg];W[rg];B[oh];W[ng];B[rf];W[oe];B[ph])

(;W[oe];B[qg];W[rf];B[rg];W[pe];B[sf])
)
)

(;W[qg];B[pf];W[qe];B[qd];W[pe];B[oe];W[qh])

(;W[rf];B[pf];W[qe];B[pe]
C['A' is correct, 'B' provokes a big Black wall.]LB[qd:B][rd:A]
(;W[rd];B[rc];W[qi])

(;W[qd];B[qc];W[rc];B[rb];W[qb];B[pc];W[sb];B[rd];W[ra];B[rg];W[sd];
B[qg];W[se])
)
)
)

(;W[nc];B[oc];W[nd];B[of]
C[Fighting erupts. Continuation depends on overall board position.];
W[pe]C[White 8 shows toughness.];B[oe];W[od];B[pc]
C[White 'a' and 'b' are possibilities.]LB[og:b][qd:a]
(;W[qd];B[qe];W[pf];B[og]C[White 'a' and 'b' are possibilities.]
LB[rd:b][rf:a]
(;W[rf];B[rd];W[qi];B[oi])

(;W[rd];B[rf];W[qb];B[qg];W[ob])
)

(;W[og];B[ng];W[qd]C[Black continues with 'a' or 'b'.]LB[qc:b][qe:a]
(;B[qe];W[pf];B[pg];W[rf];B[rd];W[oh];B[nf];W[nh];B[mg];W[qh])

(;B[qc]AB[qk][ok][jd][jf]AW[ld][lf]
C[The additional stones are from the professional game where this
variation arose: 1973 Pro Best Ten: Takagawa (White) versus Cho
Chikun (Black).]
;W[rd];B[rc];W[pg];B[qe];W[nf];B[pf];W[ne];B[pe];W[nh];B[mg];W[li];
B[mh];W[mi];B[oh];W[ni];B[ph];W[qg];B[qh];W[lh];B[rg];W[lg];B[rf])
)
)

(;W[pc]C[Black continues with 'a' or 'b'.]LB[oc:b][qc:a]
(;B[qc];W[oc]C[Black 'a' is preferable to 'b'.]LB[qb:b][od:a]
(;B[od];W[nc];B[qb];W[nd];B[of];W[jd])

(;B[qb];W[od];B[pe];W[kd])
)

(;B[oc];W[qd];B[qe];W[od]C[Black continues with 'a' or 'b'.]
LB[qc:b][pe:a]
(;B[pe];W[nc];B[qc];W[pb]
C[Black continues with 'a'. Black 'b' is not as favorable.]
LB[qb:b][oe:a]
(;B[oe];W[nd])

(;B[qb];W[ob]
C[Now Black 'a', White 'b', not as favorable for Black as the other
variation.]
LB[ne:b][oe:a])
)

(;B[qc];W[pe];B[rd];W[pd];B[qb];W[nc];B[pf])
)
)

(;W[rf]
C[White 4 was played by Fujisawa Shuko = Fujisawa Hideyuki against Kato Masao in game
4 of the 1978 Kisei Title.

'A' with support in the lower right, or 'B'.
]
LB[qe:B][qi:A]
(;B[qi];W[qd];B[qc];W[qe]LB[rc:A][pc:B]
C['A' or 'B' are joseki, 'A' takes the corner.
]
(;B[rc]LB[od:A][of:B]C['A' is joseki, 'B' is too afraid.
]
(;W[od]LB[pc:A][pe:B]C['A' is correct, 'B' is wrong.
]
(;B[pc];W[of];B[pe];W[ng])

(;B[pe];W[pc];B[oc];W[pb];B[oe];W[nd];B[ob];W[nf];B[ne];W[me];B[md];
W[nc])
)

(;W[of];B[nd])
)

(;B[pc];W[rc];B[rb];W[sb];B[rd];W[sc];B[ra];W[qb];B[pb];W[of])
)

(;B[qe];W[pf];B[nd];W[qj])
)

(;W[of]C[White 4 gives away much profit, but breaks up the center.];
B[nd];W[mf]
C[Black continues with 'a' to solidify the corner position. Black
'b' is premature.]
LB[kf:b][rf:a]
(;B[rf]C[White continues with 'a' or 'b'.]LB[kf:b][qg:a]
(;W[qg];B[kf];W[qd];B[qe];W[pe];B[oe];W[pf];B[qc])

(;W[kf];B[if];W[qg])
)

(;B[kf]C[Black 7 is premature.];W[qd];B[qe];W[pe];B[oe];W[pf];B[qc];
W[rf];B[rd];W[nj])
)

(;W[qe]C[White 4 is a mistake, giving Black solid territory.];B[qd];
W[rf];B[rd];W[pj]C[White may extend nearby 8 (instead of White 8).];
B[md]C[Black may also play above Black 9, at n17.])
)

(;B[qc]C[
San-san
---------
];W[of];B[md];W[pj])

(;B[rf]C['A' is correct, 'B' is getting tricked.]LB[qe:B][re:A]
(;W[re];B[qe];W[rg];B[rd];W[sf])

(;W[qe];B[qd];W[re];B[rd];W[se];B[mc])
)

(;B[qe]
C[This variation is included in two other branches:
1. as Hoshi - r11 (yongengakari) - variation for White corner invasions after White made a base,
2. as Hoshi-Tenuki-Sanrensei-variation for White on the run.
])
)

(;W[pf]
C[
Ikken Takagakari = Hankan Nop'dakeolch'im = Yi Gaojia = 1-Space High Approach
------------------------------------------------------------------------------

Black typically responds at 'a *' or 'g *'. Black 'b' is played
when Black finds play on the right side advantageous. Black 'c'
or 'd' may be played when Black has support at top.

Black 'e' shows White follow-up if Black plays elsewhere.

Black 'f' makes territory like 'a', but forgets to care for additional
influence which is created by 'a'.

f6, e5, d4, c3, b2, a1
]
LB[qj:g][qf:f][dp:e][qh:d][ph:c][pj:b][nd:a]
(;B[nd]
C[
Ikken Tobi = Hankan Ddwim = Yi Tiao` = 1-Space Jump
----------------------------------------------------

White continues with 'a *'. White 'b' to 'e' are not recommended.
]
LB[lc:e][qj:d][pj:c][qc:b][qd:a]
(;W[qd];B[qc];W[qe];B[rc];W[qj];B[jc]C[

* GOOD VARIATION *])

(;W[qc]
C[White 4 contradicts the strategy of enphasizing the center with
the high approach move.]
;B[qd]C['A' is correct. 'B' is questionable.]LB[rd:B][pb:A]
(;W[pb]C['A' leaves a possibility to kill White, 'B' doesn't.]
LB[rc:B][nb:A]
(;B[nb];W[rd];B[re];W[rc];B[qf]
C[Later, Black 'A' is a threat to kill,
Black 'B' kills if Black has the ladder.]
PL[2]LB[sd:B][nc:A]
(;B[nc];W[ob])

(;B[sd];W[rb];B[qa];W[ra];B[pa];W[ob];B[oa];W[nc]
(;B[mc];W[oc];B[mb];W[od];B[oe];W[ne];B[md];W[pe];B[of];W[pg];B[qe];
W[nf])

(;B[oc];W[mc];B[mb];W[na];B[ma];W[qb];B[na];W[lb])
)
)

(;B[rc];W[rb];B[pc];W[qb];B[rd];W[nb];B[mb];W[ob];B[mc];W[sb])
)

(;W[rd]
C['A' attempts to attack White, 'B' just lets him settle himself.]
LB[re:B][pc:A]
(;B[pc];W[rb];B[qb];W[rc];B[pb];W[qe];B[rf]
C[And Black attacks White's weakness.];W[qg];B[rg];W[qh];B[re];W[rh];
B[ra])

(;B[re];W[rc];B[qf];W[ob])
)
)

(;W[pj]
C[White 4 prior to taking part of the corner is not recommended.];
B[qf]C[Black solidifies the corner.];W[qg];B[qe])

(;W[qj];B[jc]C[Later White A or Black B.]PL[2]LB[qf:B][rd:A]
(;W[rd];B[qe];W[qf];B[re];W[rf]C['A' is easier than 'B'.]PL[2]
LB[se:B][rc:A]
(;B[rc];W[se]PL[2];B[qd])

(;B[se];W[oc])
)

(;B[qf];W[qg];B[qe])
)

(;W[lc];B[me]C['A' or 'B'.]LB[qj:B][jd:A]
(;W[jd];B[qj])

(;W[qj];B[kd])
)
)

(;B[pj]
C[
Sangen Takabasami = Sekan Nop'dahyeopgong = San Gaojia = 3-Space High Pincer
-----------------------------------------------------------------------------
]
;W[nd]C[Black responds with 'a' to 'c'.]LB[qc:c][pc:b][oe:a]
(;B[oe];W[qc]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pc:b][qd:a]
(;B[qd];W[pc];B[of];W[od]C[Black continues with 'a' or 'b'.]
LB[pe:b][pg:a]
(;B[pg])

(;B[pe];W[mf])
)

(;B[pc]C[Black 7 is the wrong direction.];W[qd];B[qe];W[pe];B[re];
W[pb];B[ob];W[od];B[oc];W[nb];B[qb];W[nc];B[pa];W[nf])
)

(;B[pc];W[nf];B[nb])

(;B[qc])
)

(;B[ph]AB[lc]
C[
Ikken Takabasami = Hankan Nop'dahyeopgong = Yi Gaojia = 1-Space High Pincer
----------------------------------------------------------------------------

This situation arises when Black has support at top.
]
;W[qd];B[qc];W[pc]
C[White must have the ladder to play this way (especially for d4).

Black has various continuations.]
LB[rc:d][qb:c][pe:b][od:a]
(;B[od];W[qb];B[rc];W[rb];B[qe];W[rd];B[re];W[sc])

(;B[pe];W[rc];B[qb];W[rb]
C[Black continues at 'a' or 'b'. 

Black 'a' is more sensible, as Black yields the corner for thickness.]
LB[pb:b][oc:a]
(;B[oc];W[pb];B[qe];W[rd];B[ob];W[qa])

(;B[pb]C[Black crawls along the second line (the line of defeat).];
W[oc];B[ob];W[nc];B[nb];W[qe])
)

(;B[qb];W[od];B[pb];W[oc];B[rd];W[qe];B[ob])

(;B[rc]C[White must have the ladder to play this way.];W[od]
C[White 8 at 'a' does not work.]LB[pb:a])
)

(;B[qh]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

Black 3 was played by Kitani Minoru against Iwamoto Kaoru in
game 3 of the 4th Honinbo title in November, 1947.
]
;W[nd];B[pc];W[ph];B[qg];W[qf];B[pg];W[of];B[og];W[nf];B[nc];W[ld];
B[mc];W[kf])

(;B[tt]
C[
Tenuki
-------

Black plays elsewhere.

White continues with 'a' or 'b'.
]
LB[ne:b][nd:a]
(;W[nd]C['A', 'B' or 'C'.]LB[qd:C][oe:B][qc:A]
(;B[qc];W[nf]
C[Black continues locally with 'a', or plays elsewhere (b).]
LB[cq:b][oe:a]
(;B[oe]
C[White 6 aims to take more corner territory. Black cannot hope
to break into the center.]
;W[of];B[ne];W[me];B[md];W[ld];B[mc];W[lc];B[nb];W[mb];B[nc];W[lf])

(;B[tt]C[Black plays elsewhere again.];W[oc]
C[Black continues with 'a' or 'b'. 

Black 'a' risks abandoning the corner stones (White's choice).]
LB[qf:b][rf:a]
(;B[rf]C[White continues with 'a' or 'b'.]LB[rg:b][qg:a]
(;W[qg]C[White gains further influence.];B[rg];W[qe];B[re];W[qd];B[rd]
;W[pc];B[qb];W[qh])

(;W[rg]C[White takes the corner.];B[qg];W[qf];B[rh];W[re];B[sg];W[qe];
B[oh])
)

(;B[qf];W[qg];B[qe];W[rg];B[tt]C[Black plays elsewhere.];W[rd]
C[White 11 is the vital point.];B[re];W[qb];B[rb];W[pb];B[ra])
)
)

(;B[oe];W[qc];B[pc];W[qd]C['A' is correct, 'B' is wrong.]
LB[ne:B][of:A]
(;B[of];W[pg];B[kd])

(;B[ne];W[md])
)

(;B[qd];W[nf];B[rf])
)

(;W[ne];B[nc];W[mc];B[mb];W[nb]
C[Black continues with 'a' to take the corner, or 'b' to get out
to the center.]
LB[nd:b][ob:a]
(;B[ob];W[nd];B[oc];W[lb];B[na];W[ld])

(;B[nd]C[White continues with 'a'. White 'b' is unreasonable.]
LB[md:b][ob:a]
(;W[ob];B[pc];W[lc];B[md];W[kd];B[ke];W[je];B[kf])

(;W[md]C[White 9 is unreasonable.];B[lb];W[pc];B[ob];W[od];B[oc];W[oe]
;B[qd];W[pb];B[na];W[rc];B[qc];W[qb];B[rb];W[ra];B[sb];W[sc];B[pa];
W[sa];B[rb];W[sb];B[rd];W[re];B[oa];W[sd];B[qa];W[qe];B[rb];W[qb])
)
)
)

(;B[qf]
C[
Tsuke-Hiki = Attach to draw back
-----------------------------------

White continues with 'a'. With a favorable ladder to the lower
left, White may consider 'b'.
'c' is not recommended.
]
LB[pe:c][qe:b][qg:a]
(;W[qg];B[qe];W[ph];B[nc]C['A' or 'B'.]LB[ql:B][qk:A]
(;W[qk]
C[Unlike Black 3 onto the squared position, Black has no strong
continuations into the center.]
LB[qf:3]MA[nd])

(;W[ql])
)

(;W[qe]
C[White must have the ladder to the lower left to play this way.];
B[pe];W[qg];B[rf];W[rg]
C[Black continues with 'a'. If White has a favorable ladder, Black
'b' is a mistake.]
LB[pg:b][of:a]
(;B[of];W[pg];B[re];W[pk]PL[2];W[qc]
C[Later, White may want to use the aji here - but there is none!];
B[pc]C['A', 'B', 'C' don't work.]LB[qd:C][qb:B][pb:A]
(;W[pb];B[ob];W[qd];B[rd];W[rc];B[rb]
(;W[qb];B[sc])

(;W[oc];B[od];W[nb];B[nc];W[oa];B[qb];W[oc];B[mc])
)

(;W[qb];B[qd];W[pb];B[ob])

(;W[qd];B[qb];W[rc];B[rb];W[sd])
)

(;B[pg]
C[If White has a favorable ladder to catch Black 9, Black 9 is
a mistake. Otherwise, White 4 was a mistake.]
;W[of];B[re];W[ph])
)

(;W[pe];B[qe];W[od];B[oc];W[pc];B[qd];W[nc];B[ob];W[ne];B[nb];W[mc];
B[pg])
)

(;B[qj]
C[
Sangen Basami = Sekan Hyeopgong = San Jia = 3-Space Low Pincer
---------------------------------------------------------------
]
;W[nd];B[oe];W[qc];B[qd];W[pc];B[of]
C['A *' is joseki, 'B' is more complicated.]LB[pg:B][od:A]
(;W[od];B[pg]C[
* GOOD VARIATION *])

(;W[pg];B[oi];W[od];B[pe];W[og];B[mf];W[mg];B[lf];W[mi])
)
)

(;W[pg]
C[
Nikken Takagakari = Dukan Nop'dakeolch'im = E`r Gaojia = 2-Space High Approach
-------------------------------------------------------------------------------

White 2 is a light approach move. Rarely played in even games,
White 2 is typically employed in handicap games.

Black continues with 'a *' or 'b *'.
In Korean Sunjang Baduk Black has a stone on 'c'.
]
LB[md:c][qj:b][nd:a]
(;B[nd]
C[
Ikken Tobi = Hankan Ddwim = Yi Tiao` = 1-Space Jump
----------------------------------------------------

White continues with 'a *' or 'b *'.
]
LB[qd:b][qk:a]
(;W[qk];B[jc]C[
* GOOD VARIATION *];W[qd]
C[The continuations are the same as without the marked extensions.]
TR[qk][jc])

(;W[qd]
C[Black continues with 'a *' or 'b'. Black 'a' gives a clear-cut
division of territory: Black at top, White at right. Black 'b'
offers White choices.]
LB[qe:b][qc:a]
(;B[qc]C[White continues with 'a *' to 'c'.]LB[rc:c][pe:b][qe:a]
(;W[qe];B[rc];W[pe];B[od];W[qk];B[jc]C[
* GOOD VARIATION *])

(;W[pe];B[od];W[re]
C['A' is correct. 'B' is bad, because the aji at C is destroyed.]
LB[qf:C][rd:B][rc:A]
(;B[rc];W[qk];B[jc])

(;B[rd];W[qe];B[rc])
)

(;W[rc]C[Black continues with 'a' or 'b'.]LB[qe:b][pc:a]
(;B[pc];W[qe];B[rb];W[qk];B[jc])

(;B[qe];W[rd];B[pc];W[pe]C[Black continues with 'a' or 'b'.]
LB[oe:b][pf:a]
(;B[pf];W[oe];B[qg];W[of];B[qf];W[ph];B[ri];W[od];B[oc];W[nc];B[nb];
W[mc];B[mb];W[lc];B[rb]
C[Black's territory is superior to White's thickness.])

(;B[oe];W[pf];B[rb];W[re];B[jc])
)
)
)

(;B[qe];W[pe]
C[White 6 is a trick play.

Black 'a' offers Black an advantage. Black 'b' makes White fight
a ko for life in the corner. Black 'c' is a mistake, with Black
taking the corner and White getting superior thickness. 'd' gives
White the choice, but is good for Black. 'e' is possible.]
LB[oe:e][rf:d][qf:c][pf:b][re:a]
(;B[re]
C[White continues with 'a' to 'c'. White 'a' results in an ongoing
fight. White takes the corner with 'b' or 'c', yielding superior
thickness to Black.
'd' is not recommended.]
LB[od:d][pc:c][qc:b][rd:a]
(;W[rd]C[White 8 is a fighting move.];B[rg]LB[pc:b][od:a]
(;W[od];B[pc];W[oe];B[oc];W[nc];B[mc];W[nb];B[qc])

(;W[pc]C[White 10 is not recommended.];B[od];W[ob];B[nb]
C[White continues with 'a' or 'b'.]LB[pf:b][rb:a]
(;W[rb];B[pf]
C[White 14 is correct shape.

Being sealed in the corner is painful for White.])

(;W[pf]LB[qh:B][qc:A]
(;B[qc];W[rc];B[qb];W[rb];B[pb];W[qa];B[oc]
C[White continues with 'a'. White 'b' is a mistake.]LB[rf:b][rh:a]
(;W[rh];B[qh];W[rf];B[ri];W[qf];B[pk])

(;W[rf]C[White 22 is a mistake.];B[qf];W[qg];B[sf];W[rh];B[ri];W[sd];
B[se];W[qh];B[sh];W[qj];B[sb]
C[Black wins by one move.

The ko at 'a' is easily dismissed as out of question.]
LB[sa:a];W[sa];B[ra];W[dp]C[White make a threat elsewhere.];B[pa]
C[Black takes.])
)

(;B[qh];W[rb];B[ph])
)
)
)

(;W[qc]C[White takes the corner, giving Black thickness.];B[pc];W[pb];
B[pf];W[oe];B[of];W[ne];B[ob];W[qb];B[nc];W[rd];B[qg];W[sb])

(;W[pc];B[od];W[rc];B[pf];W[nb];B[mb]
C[White continues with 'a'. White 'b' concedes a large corner.]
LB[mc:b][ob:a]
(;W[ob]C['A' or 'B'.]LB[qb:B][mc:A]
(;B[mc]C[Later, Black reduces on A.]PL[2]LB[rb:A];B[rb];W[qb];B[rd];
W[ra];B[qc];W[sb])

(;B[qb]C[White continues with 'a'. White 'b' is a mistake.]
LB[qc:b][rb:a]
(;W[rb];B[nc];W[qc];B[lc])

(;W[qc]C[White 16 is a mistake.];B[mc]
C[Black 17 is still sente. White continues with 'a'. White playing
elsewhere ('b') and Black can get a ko on the White corner stones.]
LB[dp:b][rb:a]
(;W[rb])

(;W[tt]C[White plays elsewhere, a mistake.];B[rb];W[sb];B[na];W[ra]
C[A ko results.])
)
)
)

(;W[mc];B[ob];W[lb];B[oc])
)

(;W[od];B[pc];W[oe];B[oc];W[qf];B[rd])
)

(;B[pf]C[Black 7 makes White fight a ko for life in the corner.];W[oe]
;B[od];W[of];B[qc];W[rd];B[re];W[rc];B[rb];W[qb];B[pc];W[sb];B[ra];
W[qa];B[sd];W[sa];B[rb];W[ra];B[se];W[pb];B[ob];W[oa];B[nb];W[sc])

(;B[qf]
C[Black 7 is a mistake. Black gets a sizable corner, but White
has great thickness.]
;W[pf];B[qc];W[rd];B[rc];W[od];B[pc];W[qg];B[re];W[rf];B[sd];W[oc])

(;B[rf]C['A' or 'B'.]LB[od:B][pc:A]
(;W[pc];B[od];W[rd];B[qh])

(;W[od];B[pc];W[oe];B[oc];W[qf];B[re];W[rg];B[rd])
)

(;B[oe];W[pf];B[qc];W[rd];B[pc];W[re])
)
)
)

(;B[qj]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

White continues with 'a *' to 'd'.
]
LB[od:d][md:c][nd:b][nc:a]
(;W[nc];B[nd];W[md];B[ne];W[oc];B[pc];W[od];B[oe];W[pe]
C['A *' and 'B *' are joseki. 'A' gives a large corner for huge
influence. 'B' gives White the choice to give the corner or the
right side.]
LB[pb:B][mc:A]
(;B[mc];W[mb];B[lc];W[lb];B[kc];W[pb];B[qb];W[ob];B[pf];W[qe];B[qf];
W[re];B[rf];W[qc];B[og]C[
* GOOD VARIATION *])

(;B[pb];W[lc];B[pf];W[qe];B[qf];W[re];B[rf]
C['A *' and 'B *' are joseki. 'A' takes outside influence for the
corner. 'B' takes the top side for the right side, while the
corner becomes seki.]
LB[rc:B][of:A]
(;W[of];B[ng];W[og];B[rd];W[mg]C[
* GOOD VARIATION *];B[se];W[nf];
B[qd]C[A is gote until the endgame for White and ever for Black.]
LB[me:A])

(;W[rc]C['A *' is joseki, 'B' a mistake leading to a disaster.]
LB[qc:B][rb:A]
(;B[rb];W[sb];B[og]C[
* GOOD VARIATION *];W[qb];B[rd];W[qd];B[qc];
W[sd];B[qa];W[ob];B[sf];W[se]
C[The corner is seki, because if one side starts the ko, the ko
is in favor of the other side.])

(;B[qc];W[rd];B[rb];W[sb];B[ra];W[of];B[nf];W[og];B[qh];W[mg];B[se]
C[White cannot take the Black corner stones and must play on 'A'
(or C or D) and not connect on 'B'.]
LB[me:D][ng:C][sc:B][mf:A]
(;W[mf];B[sd];W[me];B[sa];W[ng];B[sc]
C[ Very bad for Black. Compare this White influence to the Black
influence after the correct joseki,])

(;W[sc];B[sa];W[ng];B[qd];W[mf];B[sd]
C[White wanted too much and got less.])
)
)
)
)

(;W[nd];B[oe]
C[White continues with 'a'. White 'b' and 'c' are not recommended.]
LB[ne:c][ld:b][ng:a]
(;W[ng];B[ne];W[ld];B[me]
C[White continues with 'a'. White 'b' is unreasonable.]LB[le:b][md:a]
(;W[md];B[le]
C[White must extend with 'a'. The White hane of 'b' is unreasonable.]
LB[ke:b][kd:a]
(;W[kd];B[oh];W[og];B[lg])

(;W[ke]C[White 12 is unreasonable.];B[kd];W[jd];B[kc];W[jc];B[lb];
W[jb];B[nc])
)

(;W[le]C[White 10 is unreasonable.];B[md];W[mc];B[lc];W[kc];B[lb];
W[mb];B[kb];W[jc];B[jb];W[ic];B[ib];W[hc]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nc:b][ob:a]
(;B[ob];W[hb]C[White 24 is not sente.])

(;B[nc]C[Black 23 is a mistake.];W[qc]
C[White 24 is possible because of Black 23 (threatening to extend
from 16).])
)
)

(;W[ld]C[White 6 is not recommended.];B[ne];W[me];B[ng];W[pi];B[pj];
W[oi];B[mf];W[lf];B[lg];W[kf];B[oj]
C[Because White is high on both sides, White cannot slide into
the corner or invade at the 3-3.])

(;W[ne]C[White 6 is not recommended.];B[of];W[pi];B[pj];W[oi];B[nf];
W[mf];B[mg];W[lf];B[nh];W[oj];B[ok];W[nk];B[ol])
)

(;W[md]C['A' or tenuki 'B'.]LB[dp:B][ne:A]
(;B[ne]C[White continues with 'a' or 'b'.]LB[nd:b][me:a]
(;W[me];B[nf];W[nd];B[od];W[pi];B[pj];W[oi];B[mf]
C[Later, White continues on A.]LB[qf:A];W[qf];B[qe])

(;W[nd];B[oe];W[ng];B[me];W[ld];B[le];W[kd]
C[For continuation see the variation referenced by the numbers.]
LB[pd:1][pg:2][qj:3][nd:4][oe:5][ng:6][ne:7][md:8][me:9][ld:10][le:11][kd:12])
)

(;B[dp];W[qc];B[qd];W[pc];B[od];W[oc];B[nd];W[nc];B[me]
C['A' is correct, 'B' is questionable.]LB[ne:B][ld:A]
(;W[ld];B[nf])

(;W[ne];B[ld];W[mc];B[nf];W[oe];B[of];W[pe];B[pf];W[qe];B[qf];W[rd];
B[lf])
)
)

(;W[od]
C[Black continues with 'a'. Black 'b' or 'c' are a mistake, as
White cross-cuts, and has the advantage of the nearby stone.]
LB[oc:c][oe:b][pe:a]
(;B[pe];W[oe];B[oc];W[nc];B[pc];W[of];B[nb];W[mc];B[mb];W[lc];B[oj])

(;B[oe]C[Black 5 is a mistake.];W[pe])

(;B[oc]C[Black 5 is a mistake.];W[pc])
)
)

(;AB[gd][md][dj][pj][dp][gp][mp]AW[dd][jd][dg][dm][pm][jp][pp]
C[
Sunjang Baduk
----------------

Opening position of the traditional Korean Sunjang Baduk.
'A' is the only possibility for a joseki that doesn't sacrifice
the outside stone by taking the corner.
]
PL[2]LB[qd:A];W[qd];B[qc]C['A' is correct, 'B' is not recommended.]
LB[qe:B][pe:A]
(;W[pe];B[od]C['A' is correct, 'B' is wrong.]LB[qe:B][rc:A]
(;W[rc]C['A' is correct, 'B' is too shy.]LB[qb:B][rd:A]
(;B[rd];W[qe];B[rb];W[ne]C['A' is correct, 'B' is a mistake.]
LB[re:B][nd:A]
(;B[nd];W[re])

(;B[re];W[pc];B[qb];W[nd];B[oc];W[nc])
)

(;B[qb];W[qe])
)

(;W[qe];B[rc]
C[White has a target to be attacked, Black has many points.])
)

(;W[qe];B[pc]
C[Now White cannot make an extension so he has no eye space.])
)
)

(;W[qg]
C[
Nikken Kakari = Dukan Keolch'im = E`r Gua`jiao~ = 2-Space Low Approach
-----------------------------------------------------------------------

Two of the answers for Black are 'A *', which is joseki, and
'B'.
]
LB[qe:B][mc:A]
(;B[mc]C['A *', 'B' or 'C'.]LB[qd:C][qc:B][rd:A]
(;W[rd];B[qc];W[qj]
C[
* GOOD VARIATION *

Although this is considered as joseki, Black has an unpleasant
follow-up on A.]
LB[rf:A];B[rf]
C[White should answer on 'A'. Resistance on 'B' is futile, as White
4 is lost.]
LB[rd:4][qe:B][qf:A]
(;W[qf];B[re];W[qe];B[qd];W[rg];B[rc])

(;W[qe];B[qf];W[pf];B[rg];W[qh];B[re];W[qd];B[pe];W[rc];B[rb];W[qb];
B[pc];W[sb];B[ra];W[qa];B[sd];W[sa];B[rb];W[ra];B[se]
C[Black captures.])
)

(;W[qc];B[qd];W[pc];B[oc];W[ob];B[nc];W[rd];B[re];W[rc];B[qf]
C[Black has not captured the marked stone, so the position is good
for white..]
TR[qg])

(;W[qd];B[qc]C['A' or 'B'.]LB[pe:B][qe:A]
(;W[qe];B[pc])

(;W[pe];B[od];W[re];B[rc])
)
)

(;B[qe]C['A' is usual.
'B' shows the Three Crows.]LB[mc:B][qj:A]
(;W[qj];B[nc];W[qc];B[pc]C['A' or 'B' are ok.]LB[rd:B][re:A]
(;W[re]LB[rd:A][rf:B]C['A' is correct, 'B' loses the corner.
]
(;B[rd];W[rf];B[rc])

(;B[rf];W[rd];B[qf];W[pb];B[ob];W[qb])
)

(;W[rd];B[re];W[pb]C['A' or 'B' -> Ko.]LB[rb:B][ob:A]
(;B[ob];W[rb];B[pa];W[qa];B[qb])

(;B[rb];W[qb];B[ob];W[ra];B[sb];W[se];B[rf];W[pa];B[rc])
)
)

(;W[mc];B[oc]C[Three crows.];W[qc]C[White can't kill.];B[ob];W[re];
B[rd];W[qd];B[rc];W[pe];B[qf];W[rf];B[pf];W[qb];B[rb])
)
)

(;W[tt]
C[
Tenuki
-------

White plays elsewhere. 
Black continuations shown are 'a' to 'f'.
 'a' = 3-10 extension.
 'b' = large knight extension.
 'c' = small knight extension.
 'd' = high double wing formation. 
 'e' is possible, but not joseki. 'e' is shown to illustrate
White invasions.
 'f' demonstrates joseki in the ni-ren-sei and san-ren-sei fuseki.
'g' and 'h' show the correct answer to a kakari with an additional Black stone there.
'i' is far away for two low extensions.

f6, e5, d4, c3, b2, a1
]
LB[pp:f][nd:e][jd:d][nc:c][mc:b][jc:a][lc:g][kc:h][ic:i]
(;B[jc]
C[
Goken Biraki = Daseochkan Peollim = Chai Wu~ = 5-Space Extension
-----------------------------------------------------------------

White plays elsewhere 'a', or approaches at 'b'.
]
LB[qf:b][cq:a]
(;W[tt]
C[White plays elsewhere again.

Black continues with 'a' or 'b'.
Any second low extension from the hoshi is wrong:
Invasions after 'c' or 'd', general way of punishment (also to be applied after a Black stone on one of the triangled points) after 'e' are shown.
]
TR[qh][qi]LB[pf:b][nd:a][qg:c][qf:d][qj:e]
(;B[nd]
C[Black 5 is usually played when Black already has an extension
at the top such as Black 2.

White continues with 'a', 'b' or 'c' before entering the corner.]
LB[qg:c][qd:b][qc:a]
(;W[qc];B[qd];W[pb]C['A' or 'B' are ok.]LB[pc:B][nb:A]
(;B[nb];W[rd];B[re];W[rb];B[sd];W[rc]
C[The joseki ends.
Later, 'A' is sente, 'B' a mistake.]LB[qa:B][qf:A]
(;B[qf];W[ob])

(;B[qa]
C[Black 13 can stop White from getting two eyes, but White cannot
be captured without additional local Black supporting stones.]
;W[ra];B[pa];W[ob];B[oa];W[qb]
C[Black continues with 'a', make Black 13 futile.

Black 'b' is not recommended.]
LB[na:b][oc:a]
(;B[oc];W[na];B[ma])

(;B[na]C[Black 19 is unreasonable; White breaks out.];W[nc];B[mc];
W[oc];B[lb];W[od];B[oe];W[ne];B[md];W[pe]C[White breaks out.])
)
)

(;B[pc];W[rb]
C['A' is correct. 'B' is inferior and only makes sense if Black
needs sente very much.]
LB[rc:B][ob:A]
(;B[ob];W[rd];B[re]
C[White lives on 'A' or 'B' or takes sente playing elsewhere leaving
a ko in the corner which begins with Black 'C'.]
PL[2]LB[sd:C][qa:B][sc:A]
(;W[sc])

(;W[qa])

(;B[sd];W[sc])
)

(;B[rc];W[qb];B[ob];W[rd];B[re];W[sc])
)
)

(;W[qd];B[qc]C[White continues with 'a' or 'b'.]LB[pe:b][qe:a]
(;W[qe];B[rc];W[pe];B[od];W[qh])

(;W[pe];B[qe];W[rd];B[re];W[od];B[pc];W[pf]
C[Black continues with 'a' or 'b'.]LB[oc:b][qg:a]
(;B[qg];W[pg];B[qh];W[oc];B[ob];W[nc];B[nb];W[mc])

(;B[oc];W[rf];B[rc];W[qf];B[sd];W[qj])
)
)

(;AW[qj];W[qg];B[qe];W[qc]
C[Black tries to take all on 'A' or defends the top side on 'B'.]
LB[pc:B][rd:A]
(;B[rd]LB[lc:B][nb:A])

(;B[pc]C['A' creates a ko in the corner. 'B' reduces.]LB[re:B][rd:A]
(;W[rd];B[re];W[pb]C['A' is simple, 'B' makes the ko bigger.]
LB[rb:B][ob:A]
(;B[ob];W[rb];B[pa];W[qa];B[qb])

(;B[rb];W[qb];B[ob];W[se];B[rf];W[ra];B[sb];W[pa];B[rc];W[qd];B[sd];
W[sc])
)

(;W[re]
C['A' -> White reduces the corner in sente and secure his group
on the right.
'B' lives in the corner.]
LB[rf:B][rd:A]
(;B[rd];W[rf];B[rc])

(;B[rf];W[rd];B[qf];W[pb];B[ob];W[qb])
)
)
)
)

(;B[pf]C['A' or 'B'.]LB[qc:B][pc:A]
(;W[pc];B[oc]
C[White continues with 'a', possibly 'b'. White 'c' is a mistake.]
LB[qc:c][ob:b][qd:a]
(;W[qd]
C[Black continues with 'a' to emphasize the top, or 'b' to emphasize
the right side.]
LB[qe:b][pe:a]
(;B[pe]C[Black 7 emphasizes the top.];W[qb];B[ob];W[rf])

(;B[qe]C[Black 7 emphasizes the right side.];W[od];B[pe];W[ob];B[nc];
W[nb];B[qc];W[pb];B[mc];W[rd];B[rc];W[rb];B[re];W[qb];B[sd];W[mb];
B[lc])
)

(;W[ob];B[qc];W[pb];B[nc];W[qd];B[qe];W[rd];B[rc];W[od];B[pe];W[nb];
B[mc]LB[qd:12][ob:8][pb:10]
C[Same position as a variation of White 12 played before White 8 and 10.
]
;W[rb];B[re];W[qb];B[sd];W[mb];B[lc])

(;W[qc]C[White 6 is heavy, vulgar, and a bad play.];B[ob];W[re];B[rf];
W[qe];B[qf];W[pe];B[oe];W[qd]
C[Black plays 'a' to seal White in with great thickness, or 'b'
to fight a ko to kill White's corner stones.]
LB[ra:b][od:a]
(;B[od];W[pb])

(;B[ra];W[od];B[nd])
)
)

(;AB[qj];W[qc];B[pc];W[rd];B[rf];W[pb];B[ob];W[rb];B[pa];W[qb]
C['A' is usual, 'B' drives White out.]LB[sc:B][nc:A]
(;B[nc]
C[This move or A or B cut the possibility for White to run out.]
LB[nf:B][og:A];W[re])

(;B[sc];W[sb];B[sd];W[re];B[se];W[qf];B[qg];W[qe];B[rg];W[pe])
)
)

(;B[qg]C[White continues with 'A'.
'B' gives Black more influence.]
LB[qc:B][pc:A]
(;W[pc]C['A' takes outside influence, 'B' takes corner territory.]
LB[qc:B][oc:A]
(;B[oc]
C[White continues with 'a'. White 'b' keeps the position simple.
White 'c' is not recommended.]
LB[qd:c][qc:b][ob:a]
(;W[ob]C['A' is correct, 'B' is not recommended. 'C' is a mistake.
]
LB[qc:B][od:A][nc:C]
(;B[od]
C[White continues with 'a'. With a favorable ladder, White may
play 'b'.]
LB[qb:b][pb:a]
(;W[pb];B[nb];W[qd];B[qe];W[rd];B[mc]
C[White can defensively with 'a', leaving the aji on the right
for later; play 'b' (only to play 'a' later); or play elsewhere,
and suffer an approach-move ko.]
LB[dp:c][re:b][rb:a]
(;W[rb])

(;W[re];B[rf];W[pe]
C[Black can squeeze with 'b', or leave the cutting stone with 'a'.]
LB[qf:b][oe:a]
(;B[oe];W[qf];B[pf];W[qe];B[rg];W[rb];B[pg])

(;B[qf])
)

(;W[tt]
C[White plays elsewhere.
Black creates a ko with 'A' instead of pushing White to unconditional
life with 'B'.]
LB[re:B][rb:A]
(;B[rb]
C[Black proceeds to an approach-move ko. Black has to add extra
moves to make it a proper ko, so this is premature.]
;W[qb];B[rc];W[ra];B[sb];W[qc];B[sd];W[re];B[rf];W[se];B[oa];W[pa];
B[na];W[sc])

(;B[re]C[Mistake.];W[rb])
)
)

(;W[qb]C[White must have the ladder to play 8.];B[nb];W[qd];B[qe]
C['A' tries to trick Black if White has the ladder, White lives
without ko.
'B' gives White gote or an approach move ko like White 10 on
the triangled position.]
LB[qb:10][rd:B][re:A]TR[pb]
(;W[re];B[rd];W[qc]
C[Black continues with 'A'.
'B' tries to avois the White ladder too early and a wall too
small results.]
LB[qf:B][rf:A]
(;B[rf]C[This variations illustrates the favorable ladder for White.];
W[pe];B[se];W[nc];B[oa];W[pb]
C['A' avoids the ladder, 'B' is very bad for Black if White has
the ladder.]
LB[mb:B][nd:A]
(;B[nd];W[mc];B[md];W[mb];B[ld])

(;B[mb];W[mc];B[lc];W[oe];B[nd];W[md];B[ne];W[ld]
C['A' or 'B' are different disasters for Black.]LB[nf:B][kc:A]
(;B[kc];W[nf])

(;B[nf];W[lb])
)
)

(;B[qf];W[rc])
)

(;W[rd];B[oa];W[pb];B[mc];W[dp];B[rb];W[ra];B[rc];W[qc];B[sb];W[pa];
B[sd];W[re];B[rf];W[se];B[na])
)
)

(;B[qc];W[pb];B[nc]C['A' is correct, 'B' -> White dies.]LB[qb:B][qd:A]
(;W[qd];B[qb];W[od];B[pe];W[nb];B[qe];W[mc];B[nd])

(;W[qb];B[rc];W[nb];B[mc];W[mb];B[lb];W[rb];B[sb])
)

(;B[nc];W[qc];B[qd];W[nb];B[mc];W[rd];B[re];W[rc])
)

(;W[qc]C[
Black continues with 'a'. Black 'b' permits White sente.]
LB[od:b][ob:a]
(;B[ob];W[re];B[pf];W[rb])

(;B[od];W[re];B[pf]C[White can afford to play elsewhere.])
)

(;W[qd]
C[White 6 is not recommended. The result is similar to the one 
in the variation of Black 5 being on the squared position instead.]
LB[qg:5]SQ[pf];B[qe];W[od];B[pe];W[ob];B[nc];W[nb];B[qc];W[pb];B[mc];
W[rd];B[rc];W[rb];B[re];W[qb];B[sd];W[mb];B[lc]
C[The result is similar to the one in the variation of Black 5 
being on the squared point, but Black 5 is in a better position 
here.]
LB[qg:5]SQ[pf])
)

(;B[qc];W[oc]C['A' or 'B' are ok,
]LB[qb:B][qd:A]
(;B[qd];W[lc])

(;B[qb];W[ne];B[pe];W[lc])
)
)

(;W[qc];B[pc];W[qd]
C['A' is correct, 'B' gives less influence. 'C' doesn't close on the right side.
]
LB[qe:B][qb:A][pe:C]
(;B[qb]C[White continues with 'a'. White 'b' is a fatal mistake.]
LB[rb:b][qf:a]
(;W[qf];B[pf];W[qe];B[pg];W[rb];B[pb];W[rg];B[rh];W[sg];B[qi])

(;W[rb];B[pb]
C[White lives on 'A', but a cut in the Black wall is gone.
White 'B' dies.]
LB[qf:B][qe:A]
(;W[qe];B[pe];W[qf];B[pf];W[rg];B[qh];W[rh];B[qi])

(;W[qf];B[pf];W[qe];B[rg]C[White may try 'a' or 'b'. Neither work.]
LB[rf:b][ra:a]
(;W[ra];B[sd])

(;W[rf];B[ra])
)
)
)

(;B[qe];W[re];B[rf];W[pe];B[qf];W[pb];B[ob];W[qb];B[nc];W[sd];B[oe])

(;B[pe];W[qe];B[pb];W[qf];B[pf];W[rg];B[qh];W[rh];B[qi])
)
)

(;B[qf]
C[White can play 'A', 'B' or 'C'.
'C' leads to many variations which are the same as after 'A'
or 'B'.
'D' is a mistake, creating only a ko.]
LB[qc:D][ob:C][pb:B][pc:A]
(;W[pc]C[Black can take influence on 'A' or territory on 'B'.]
LB[oc:B][qc:A]
(;B[qc];W[oc]C[Both 'A' and 'B' are possible.]LB[qb:B][qd:A]
(;B[qd];W[lc];B[mb]C[Later Black can attack.];W[lb];B[nc];W[nd];B[ob];
W[pb];B[od])

(;B[qb];W[od];B[pe];W[lc])
)

(;B[oc]C['A' is correct.
'B' or 'C' -> White lives in the corner.]
LB[qd:C][qc:B][ob:A]
(;W[ob]C['A', 'B' or 'C'.]LB[od:C][pb:B][qc:A]
(;B[qc];W[pb]C['A' or 'B' give the corner.]LB[qb:B][nc:A]
(;B[nc]C['A' is correct, 'B' is similar.
'C' or 'D' -> White dies.]
LB[qd:D][qb:C][rc:B][nb:A]
(;W[nb];B[mc];W[rc]C['A' gives the corner, 'B' pushes White outside..]
LB[qb:B][qd:A]
(;B[qd];W[qb];B[rd];W[rb])

(;B[qb];W[qd];B[rd];W[qe];B[rb];W[pe];B[od];W[re];B[sc])
)

(;W[rc]
C['A' gives White a small group in the corner.
'B' -> White destroyes the side.]
LB[qb:B][qd:A]
(;B[qd];W[qb];B[nb];W[ra])

(;B[qb];W[qd];B[rb];W[pe];B[od];W[qe])
)

(;W[qb];B[rc];W[nb];B[mc];W[rb];B[sb];W[mb];B[lb])

(;W[qd];B[rd])
)

(;B[qb];W[od];B[nc];W[qd];B[pe];W[nb];B[mc];W[mb];B[lc];W[rd];B[rc];
W[sb])
)

(;B[pb];W[qc]C['A' is correct. 'B' -> White lives easily.]
LB[nb:B][qb:A]
(;B[qb]C['A' is correct, 'B' is old.]LB[qd:B][od:A]
(;W[od];B[nc];W[qd];B[pe];W[nb]
C['A' takes the corner, 'B' the outside.]LB[mc:B][rb:A]
(;B[rb];W[mc];B[nd]
C['A' if White is strong on the top left, 'B' if Black is strong
on the top left.]
LB[me:B][md:A]
(;AW[ec][hc];W[md];B[ne];W[me];B[nf];W[je])

(;AB[dc][gc];W[me];B[md];W[ld];B[ne];W[nf];B[oe];W[le];B[lc]
C[Later this continuation is not favorable for Black.];W[kc];B[mb];
W[lb];B[mc];W[kd];B[kb];W[jb];B[la];W[ic])
)

(;B[mc];W[rb])
)

(;W[qd]C['A' is better than 'B'.]LB[od:B][pe:A]
(;B[pe]
C[White continues with 'A' to sacrifice the three corner stones
for life at top. 

White 'B' let's White live in the corner with just two eyes:
an unacceptable loss for White in the early game.]
LB[od:B][nb:A]
(;W[nb];B[rb];W[kc];B[jd];W[od];B[nc];W[mc];B[nd])

(;W[od]
C[White 12 is a mistake. White's two-eyed corner is nothing to
Black's thickness.]
;B[nc];W[rb];B[nb];W[qa];B[oa];W[sc])
)

(;B[od];W[rb];B[nb];W[qe];B[pf];W[qa];B[oa];W[rf];B[rg];W[re];B[qh])
)
)

(;B[nb];W[od];B[nc];W[qb];B[oa];W[pe])
)

(;B[od];W[pb];B[nb];W[qd];B[qe];W[rd]
C['A' is correct, 'B' is a mistake.]LB[rb:B][mc:A]
(;B[mc]
C[White can tenuki, because Black can only make a disadvantageous
ko.]
;W[tt];B[rb]C['A' is followed by a better endgame than 'B',]
LB[rc:B][qb:A]
(;W[qb];B[rc];W[ra];B[sb]C['A' -> Ko, 'B' or 'C' -> White dies.]
LB[pa:C][qa:B][qc:A]
(;W[qc];B[oa];W[pa];B[sd];W[re];B[rf];W[se];B[na];W[sc])

(;W[qa];B[oa];W[re];B[rf];W[se];B[sc])

(;W[pa];B[qc])
)

(;W[rc];B[qb];W[sb];B[ra]C['A' -> Ko, 'B' or 'C' -> White dies.]
LB[re:C][sc:B][qc:A]
(;W[qc];B[re];W[sd];B[pa];W[oa];B[na];W[qa])

(;W[sc];B[re];W[qa];B[oa])

(;W[re];B[qc])
)
)

(;B[rb];W[nc]C['A' or 'B'.]LB[mc:B][mb:A]
(;B[mb]C[Later, White has continuations on A or B.]LB[pe:B][ne:A])

(;B[mc];W[qb];B[rc];W[na];B[mb];W[ra];B[sb];W[qc]
C[White lives in double ko.])
)
)
)

(;W[qc];B[ob];W[re];B[rf];W[qe];B[pe];W[qd]C['A' or 'B'.]
LB[ra:B][pf:A]
(;B[pf];W[pb])

(;B[ra];W[pf])
)

(;W[qd]C['A' -> White in the corner, 'B'-> White on the right side.]
LB[qc:B][pe:A]
(;B[pe];W[qb];B[ob];W[re];B[rf];W[rc])

(;B[qc];W[pb];B[ob];W[pe];B[od];W[qe];B[rc];W[pf])
)
)
)

(;W[pb]C['A', 'B' or 'C'.]LB[nb:C][oc:B][pc:A]
(;B[pc]C['A' right, 'B' wrong.]LB[qb:B][ob:A]
(;W[ob];B[qb];W[rb]C['A' right, 'B' wrong.]LB[qa:B][qc:A]
(;B[qc];W[lc];B[je];W[le]
C[Later, White wants to play A.
White 'B' is a mistake.]PL[2]
LB[nd:B][nc:A]
(;W[nc])

(;W[nd]C[White 11 is a mistake.];B[oc];W[nc];B[mb]
C[Black 14 gouges White's living space.])
)

(;B[qa];W[mc];B[tt]
C[Later, White may use the aji on 'A' by occupying 'B', aiming
at 'C'.]
LB[rd:C][qg:B][qc:A];W[qg]LB[rf:D][rg:C][pg:B][pf:A]
(;B[pf];W[rf];B[re];W[rd];B[qd];W[rc];B[qc];W[se])

(;B[pg];W[qe])

(;B[rg];W[qe])

(;B[rf];W[pe];B[qe];W[qc];B[rc];W[od]
C[Now, the exchange of the marked stones is bad for Black.]TR[rf][qg])
)
)

(;W[qb];B[ob]C[White is dead.])
)

(;B[oc];W[ob];B[nb];W[nc]
C[Black can enclose White on 'A' or hunt White on 'B'.]LB[mc:B][mb:A]
(;B[mb];W[qd];B[qe];W[rd];B[od]
C[This is not bad shape in this situation.];W[rb])

(;B[mc];W[nd];B[mb];W[qd];B[qc];W[pc];B[rd];W[od];B[qe]
C[White has no eyes and must run.])
)

(;B[nb]C['A' right. Black wants to lure White into the mistake 'B'.]
LB[oc:B][qc:A]
(;W[qc];B[qd]C['A' lives or goes out, 'B' lives.]LB[rb:B][rd:A]
(;W[rd]
C['A' encloses White living, 'B' attacks White pushing him out.]
LB[rb:B][re:A]
(;B[re];W[rb];B[sd];W[rc];B[nc]
C[Black 15 is sente against the life of the White group. White
must answer on 'A', Tenuki on 'B' is wrong.]
LB[nc:15][dp:B][ob:A]
(;W[ob])

(;W[tt];B[qa];W[ra];B[pa];W[ob];B[oa]
C[After Black 15, White cannot go out and dies.]LB[nc:15])
)

(;B[rb];W[rc];B[re];W[sb];B[ra];W[sd];B[pa];W[ob];B[oa];W[nc];B[mb];
W[mc];B[lb];W[od])
)

(;W[rb]C['A' or 'B' don't kill.]LB[rd:B][nc:A]
(;B[nc];W[rd];B[re])

(;B[rd];W[ob];B[nc];W[rc];B[oa];W[qa];B[sc];W[sb])
)
)

(;W[oc];B[qc];W[nc];B[mc];W[md];B[lc];W[ne])
)
)

(;W[ob]
C[
Black continues with 'a' to 'c'. Black 'd' is not recommended.]
LB[nc:d][oc:c][pb:b][pc:a]
(;B[pc];W[pb]C[Same variation as White 8 first.]LB[ob:6][pb:8])

(;B[pb]
C[White continues with 'a'. 

White 'b' is a trick play.

White 'c' is a mistake.]
LB[oc:c][pe:b][pc:a]
(;W[pc]C[Black continues with 'A' or 'B'.]LB[qc:B][oc:A]
(;B[oc]C[Same variation as White 8 first.]LB[pc:8])

(;B[qc];W[oc];B[qb];W[od];B[pe];W[lc])
)

(;W[pe]C[White 6 is a trick play.];B[qe];W[pc]
C[Black continues with 'a'. Black 'b' falls for the trick.]
LB[qc:b][oc:a]
(;B[oc];W[qc];B[od]
C[White continues with 'a'. White 'b' is a mistake.]LB[nb:b][qb:a]
(;W[qb];B[nb];W[pa];B[mc])

(;W[nb]C[White 12 is a mistake.];B[qb])
)

(;B[qc]C[Black 9 is a mistake.];W[oc];B[qb];W[od];B[qd];W[lc])
)

(;W[oc]C[White 6 is a mistake.];B[pc];W[lc];B[od];W[nd];B[ne];W[md];
B[je];W[lf];B[nf]
C[The solid connection of Black 15, preventing White from attaching
there, is the right way to attack.])
)

(;B[oc]C['A' or 'B'.]LB[qc:B][pb:A]
(;W[pb]C['A' is correct, 'B' is questionable.]LB[qc:B][nb:A]
(;B[nb]C[Same variation as White 8 first]LB[pb:8])

(;B[qc];W[nc];B[nd];W[mc];B[md];W[lc];B[ld];W[pc];B[od]
C['A' or, with the ladder, 'B'.]LB[rc:B][qb:A]
(;W[qb];B[rc];W[kb])

(;W[rc];B[qd];W[qb];B[rd];W[sc])
)
)

(;W[qc];B[nb];W[qd];B[qe];W[pb];B[mc];W[rb])
)

(;B[nc]C[Black 5 is slack, not recommended.];W[nb];B[mc];W[oc];B[od];
W[qc];B[qd];W[rc];B[rd];W[sd])
)

(;W[qc];B[pc]C['A' or 'B' -> ko.
'C' -> White runs out to the right.]
LB[rd:C][qd:B][pb:A]
(;W[pb];B[ob]C['A' or 'B' -> ko.]LB[rd:B][rb:A]
(;W[rb]
C['A' ko.
'B' Black can attempt to kill if he has additional outside strength.]
LB[rd:B][pa:A]
(;B[pa];W[qa];B[qb])

(;B[rd];W[qd]C['A' White lives.
'B' White figths to the outside.]
LB[re:B][qe:A]
(;B[qe];W[rc])

(;B[re];W[oc])
)
)

(;W[rd];B[re];W[qd];B[pe];W[rb];B[pa];W[qa])
)

(;W[qd];B[qe];W[pb];B[ob]C['A' -> ko.
'B' -> White dies.]
LB[qb:B][rb:A]
(;W[rb];B[pa];W[qa];B[qb])

(;W[qb];B[rd];W[rc];B[re])
)

(;W[rd];B[qb];W[rb];B[qd];W[rc];B[pb]
C['A' White tries to more stones find a connection on the right.
'B' White dies.]
LB[re:B][rf:A]
(;W[rf];B[re];W[se];B[qe];W[rg])

(;W[re];B[rf])
)
)
)

(;B[qj]C[Bad
];W[oj]C[Punishment
];B[ph];W[qc])
)

(;W[qf]C['A' is usual. 'B' can punish a White mistake.]LB[qe:B][nd:A]
(;B[nd]
C[White invades at 'a' to 'c'. 'a' is simplest and most effective.]
LB[md:c][lc:b][qc:a]
(;W[qc];B[qd];W[rd]
C[White continues with 'a' or 'b'. White 'a' is typical. Black
plays 'b' to get sente (and pays a bit for it).]
LB[pc:b][re:a]
(;B[re]
C[White continues at 'a' or 'b'. 'b' leaves White a little thin.]
LB[rb:b][rc:a]
(;W[rc];B[qe];W[ob];B[nb];W[oc];B[nc];W[od];B[oe];W[pc];B[ne])

(;W[rb];B[sd];W[rc];B[qe];W[nb]C[White's shape is a little thin.])
)

(;B[pc];W[rb];B[qb];W[rc])
)

(;W[lc]C[Black continues with 'a' or 'b'.]LB[ld:b][kd:a]
(;B[kd]C[White continues with 'a' or 'b'.]LB[nc:b][oc:a]
(;W[oc]
C[Black continues with 'a'. Black 'b' lets White into the center.]
LB[pc:b][od:a]
(;B[od]C[White continues with 'a' or 'b'.]LB[nc:b][pc:a]
(;W[pc];B[qc];W[qb]
C[Black continues with 'a' or 'b'. Black 'b' captures White 6.]
LB[rd:b][rb:a]
(;B[rb];W[ld];B[le];W[jb];B[ib];W[kb];B[ic];W[pb];B[rd])

(;B[rd];W[rb];B[mb];W[nb];B[mc]C[Later, White 'a' is sente.]LB[re:a])
)

(;W[nc];B[pc];W[ld];B[le];W[jb];B[ib];W[kb];B[ic];W[mb];B[me])
)

(;B[pc];W[od];B[oe];W[nc];B[pe];W[le]
C[White 14 is the only way to play.])
)

(;W[nc];B[oc];W[md];B[ne];W[ob];B[nb];W[mb]
C[White intends to fight the ko.])
)

(;B[ld];W[mc]C[Black continues with 'a' or 'b'.]LB[kd:b][md:a]
(;B[md];W[kc]C[Black continues with 'a' or 'b'.]LB[jd:b][kd:a]
(;B[kd];W[jb]C[Black continues with 'a' or 'b'.]LB[ic:b][nc:a]
(;B[nc];W[ic];B[jd];W[lb])

(;B[ic];W[ib];B[hc];W[ob];B[qc])
)

(;B[jd];W[pb];B[qb]
C[White continues with 'a' or 'b'. With 'b', White gives up the
three stones, takes the corner and can connect to White 4.]
(;W[ob];B[qc];W[jb];B[ib];W[ka];B[kd])

(;W[qc];B[pc];W[rb];B[ob];W[qa])
)
)

(;B[kd]C[White continues with 'a' or 'b'.]LB[qc:b][pc:a]
(;W[pc]C[Black continues with 'a' or 'b'.]LB[qc:b][oc:a]
(;B[oc]
C[Black 11 captures the two stones, and is a good result for Black.];
W[qc];B[ob];W[qd];B[pe];W[qe];B[og])

(;B[qc];W[qb];B[rd];W[oc];B[od];W[nc];B[rb];W[pa];B[md])
)

(;W[qc];B[pc];W[qd];B[pe];W[qb];B[pb];W[pf]
C[Black gets a good result.])
)
)
)

(;W[md]C[Black continues with 'a' or 'b'.]LB[me:b][ne:a]
(;B[ne];W[kd];B[jd]C[White continues with 'a' or 'b'.]LB[kf:b][ke:a]
(;W[ke];B[je];W[kf];B[ig])

(;W[kf];B[je];W[mf];B[qe];W[pf];B[nf];W[mg];B[ng])
)

(;B[me];W[ld];B[ne]C[White continues with 'a' or 'b'.]LB[jd:b][le:a]
(;W[le];B[je];W[lg])

(;W[jd];B[id];W[je];B[kc];W[le];B[mb])
)
)
)

(;AW[qi]PL[2];B[qe];W[pf]C[Now the White extension is too narrow.];
B[nd];W[qc]
C['A' for security if White is strong,
'B' for fight if White is weak,
'C' as a compromise between both if White is not strong and not
weak.]
LB[qd:C][re:B][pc:A]
(;B[pc];W[re]
C['A' to capture the White stone, or 'B' to maximize eye space.]
LB[rd:B][qd:A]
(;B[qd]
C[Usual is White 'A'.
If there is a Black stone at the triangled position, Black 'B'
or White 'A'.]
LB[rg:B][rd:A]TR[qk]
(;W[rd];B[rc]C[Later continuation White 'A' or Black 'B'.]PL[2]
LB[sd:B][rb:A]
(;W[rb];B[qb];W[sc])

(;B[sd]C['A' or 'B'.]LB[se:B][rf:A]
(;W[rf])

(;W[se]C['A' gote or 'B' sente.]PL[2]LB[rb:B][sc:A]
(;B[sc];W[rf];B[qb])

(;B[rb];W[sc])
)
)
)

(;AB[qk]PL[2]
(;B[rg];W[rf];B[ri];W[rc];B[rd];W[sd];B[qb];W[rb];B[pb];W[ra])

(;W[rd];B[rc];W[dp];B[rg];W[rf];B[ri])
)
)

(;B[rd];W[qd]C['A' is correct, 'B' is a mistake.]LB[qb:B][rc:A]
(;B[rc];W[pe];B[qb])

(;B[qb]
C['A' is the correct punishment, 'B' misses punishment and reverts
to joseki.]
LB[pe:B][rc:A]
(;W[rc];B[pe];W[sd])

(;W[pe];B[rc])
)
)
)

(;AB[qk];B[re]
C['A' in this position.
'B' if Black 7 is on the triangled position instead.]
LB[nd:7][ob:B][oc:A]TR[nc]
(;W[oc];B[od];W[nc];B[pc];W[pb];B[mc]C['A' or 'B'.]LB[mb:B][rb:A]
(;W[rb];B[mb];W[oa];B[nf];W[oi];B[ok])

(;W[mb];B[qb];W[ob];B[rc];W[kc];B[jd];W[md];B[me];W[lc];B[ke];W[oi];
B[ok])
)

(;AB[nc]AE[nd];W[ob];B[nb];W[oc];B[od];W[rb];B[nd];W[rd])
)

(;B[qd]
C[Later, 'A' gives life, 'B' a ko, which is not necessarily worse
than 'A'.]
LB[pc:B][pb:A]
(;W[pb];B[rc];W[rb];B[pc];W[qb];B[ob]
C[This move instead of A is the right one, because Black seals
his territory to the top and will get a better position to slide
into the right.]
LB[rd:A];W[rd];B[re];W[sc]
C['A' and 'B' damage White on the right and are sente against the
White corner.]
LB[sf:B][se:A]
(;B[se])

(;B[sf])
)

(;W[pc];B[oc];W[rd];B[re];W[rb];B[sd];W[sc]
C['A' is necessary, the mistake 'B' gives life to the White corner.]
LB[se:B][rc:A]
(;B[rc])

(;B[se];W[ob];B[rc];W[sb];B[nb];W[pb])
)
)
)

(;B[qe])
)
)

(;B[mc]
C[
Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
-------------------------------------------------------------

White continues with 'a' to 'c' or elsewhere 'd'.
]
LB[dp:d][qf:c][qd:b][qc:a]
(;W[qc];B[qd];W[pc]
C['A' or 'B' are ok.
If Black has an additional stone on or near the triangled position,
he build his moyo on 'C'.]
LB[rc:C][od:B][oc:A]TR[qj]
(;B[oc];W[ob];B[nb];W[od];B[nc];W[rd];B[re];W[rc];B[qf]
C[White continues with 'a' or 'b'. White 'c' is not recommended.]
LB[oe:c][pa:b][pb:a]
(;W[pb];B[oe]C[White 'a' is useless.
Later, Black 'b' is sente.]PL[2]
LB[se:b][nd:a]
(;W[nd];B[me];W[pe];B[qe];W[ne];B[nf];W[of];B[md];W[oe];B[og])

(;B[se]
C[Later, this is sente. A Black stone on the triangled position
would not be sente.]
TR[na];W[dp];B[rb];W[sb];B[qa];W[sd];B[sa];W[qb];B[sc])
)

(;W[pa];B[na]
C[Later, this is sente.
A Black stone on the triangled position would not be sente.]
TR[se];W[dp];B[pb];W[qb];B[ra])

(;W[oe]
C[White 15 is not recommended, and might only make sense with White
support on the right near the marked point. Black continues with
'a' if White has such support. Otherwise, Black proceeds to kill
the White corner stones with 'b'.]
LB[pb:b][pf:a]CR[qj]
(;B[pf]AW[qj]
C[Black answers with 16 if White has a supporting stone such as
shown.]
;W[pb];B[nf];W[md]
C[White can escape, but in doing so makes bad shape and will suffer
relentless attack if no support exists to connect to. In other
words, White should only play 19 at the right time.]
;B[me];W[nd];B[ld];W[le];B[kd];W[mf];B[of];W[ne];B[pe];W[me];B[mg])

(;B[pb]
C[Black to kill the White corner stones. White has made a terrible
mistake.]
;W[qb];B[oa];W[pf];B[qe];W[qg];B[rg];W[qh];B[rh];W[qi];B[ri];W[qj];
B[sd]C[White 'a' is not sente.]LB[rj:a])
)
)

(;B[od]C['A' is correct, 'B' loses territory.]LB[ob:B][oc:A]
(;W[oc];B[nc];W[rd];B[re];W[rc];B[qf])

(;W[ob]C['A' is usual. 'B' gives more territory for more influence.]
LB[rc:B][nb:A]
(;B[nb];W[oc];B[nc];W[rd];B[re];W[rc];B[qf])

(;B[rc];W[rb];B[rd];W[nc];B[nd];W[mb];B[lc];W[lb];B[kc])
)
)

(;AB[qj];B[rc]C['A' is correct.
'B' is a mistake.]LB[rb:B][nc:A]
(;W[nc];B[nd];W[od];B[oe];W[oc];B[md];W[rb];B[rd];W[mb];B[lb]
C['A' is correct, 'B' is bad.]LB[ma:B][na:A]
(;W[na];B[kc]PL[2];B[sb]C[Later Black plays here.];W[ra]
C['A' and 'B' are sente.]LB[ka:B][la:A]
(;B[la];W[pa])

(;B[ka]C['A' is correct. tenuki 'B' -> White dies.]LB[dp:B][pa:A]
(;W[pa])

(;W[dp];B[ma];W[nb];B[pb])
)
)

(;W[ma];B[kc]PL[2];B[oa];W[ob];B[qa];W[qb];B[la]
C['A' -> White loses points.
'B' -> White dies totally.]LB[nb:B][pa:A]
(;W[pa];B[pb];W[ra];B[nb];W[pa];B[na])

(;W[nb];B[sb];W[ra];B[pa])
)
)

(;W[rb];B[rd];W[nc];B[nd];W[od];B[oe];W[oc];B[mb]
C[And Black punishes White's wrong move order.])
)
)

(;W[qd]C['A' is usual. 'B' requires the ladder.]LB[qe:B][qc:A]
(;B[qc]C[White continues with 'a' or 'b'.]LB[pc:b][qe:a]
(;W[qe];B[rc];W[of]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pe:b][od:a]
(;B[od];W[qh])

(;B[pe]
C[Black 8 is not recommended. White gets superior thickness to
Black territory.]
;W[pf];B[qf];W[qg];B[rf];W[od];B[oe];W[ne];B[pc];W[rg];B[re];W[nf])
)

(;W[pc];B[od];W[rc];B[qb];W[qe];B[rb];W[qh])
)

(;B[qe];W[re];B[pe];W[rc];B[rf];W[pc];B[se];W[rd];B[oc];W[ob];B[pb];
W[qc]C['A' lets White live, 'B' provokes the ladder.]LB[nb:B][nc:A]
(;B[nc];W[qb])

(;B[nb];W[od];B[oa];W[qf];B[rg];W[oe];B[pf];W[qg];B[of];W[rh];B[qh];
W[pg];B[ri];W[ph];B[qi];W[nf])
)
)

(;W[qf];B[qd];W[qi])

(;W[dp]
C['A' or 'B' are correct,
'C' and 'D' are bad, also any second low extension from the hoshi (triangled points). The general way to punish is shown after 'E'.
]
LB[qe:A][pj:B][qg:C][qf:D][qj:E]TR[qi][qh][qk]
(;B[qe]
C[To reduce the top side, White starts on 'A'.
To reduce the right side, White starts on 'B'.
If White has a stone on the triangled or circled position, he can invade
at A.
If White has a stone on the circled position, he can invade at
'D' or 'E'.
If White has a stone on the squared position, he can invade at
B.
After another tenuki 'C', White can no more invade.
]
TR[jc]CR[kc]MA[qg]LB[dd:C][qc:B][oc:A][ob:D][nc:E]
(;W[oc]C['A' is correct, 'B' and 'C' are bad.]LB[od:C][nd:B][pc:A]
(;B[pc];W[me]
C['A' is correct, 'B', 'C' and tenuki 'D' are questionable.]
LB[pp:D][kd:C][md:B][od:A]
(;B[od]C[End of joseki];W[lc]
C[Later continuation for White.
'A' and tenuki 'B' are possible, 'C' depends on the ladder, 'D'
and 'E' are not recommended.]
LB[nc:E][md:D][ld:C][pp:B][lb:A]
(;B[lb];W[mb]
C['A' is best, gives a large fight, 'B' gives a low position, 'C'
if Black has the ladder.]
LB[kc:C][nb:B][ld:A]
(;B[ld]C['A' is correct, 'B' is questionable.]LB[md:B][kc:A]
(;W[md]
C['A' pushes the fight to the top left, 'B' to the right center.]
LB[kc:B][nc:A]
(;B[nc];W[kc];B[le];W[lf];B[jd])

(;B[kc];W[nc]C['A' big fight, 'B' ko.]LB[nd:B][lc:A]
(;B[lc])

(;B[nd])
)
)

(;W[kc];B[md]C[White in deep trouble.])
)

(;B[nb];W[md]C['A' is correct, 'B' is a mistake.]LB[nc:B][ma:A]
(;B[ma];W[nc];B[mb];W[kc]
C[Black in low position.
A is a big follow-up for both.]LB[ke:A])

(;B[nc];W[kb];B[ma];W[kd])
)

(;B[kc]C['A' if Black has the ladder, 'B' if White has the ladder.]
LB[ld:B][nc:A]
(;W[nc];B[ld];W[md]C['A' big fight, 'B' ko.]LB[nb:B][lc:A]
(;B[lc];W[nd];B[kf];W[mg]
C[Result depends on how the fight fits in the whole board position.])

(;B[nb])
)

(;W[ld];B[nb];W[kb];B[ma];W[jc])
)
)

(;B[pp])

(;B[ld];W[md];B[kc];W[lb];B[kb];W[mb];B[nc];W[kd];B[le];W[jd])

(;B[md];W[ld]C[White 'A' is less bad than 'B'.]LB[lb:B][le:A]
(;B[le];W[ke];B[lf];W[mb]C[White's sacrifice stone works well.])

(;B[lb];W[kb];B[mb];W[le])
)

(;B[nc]C[Black overconcentrated.])
)

(;B[md];W[ne];B[od])

(;B[kd]
C['A' makes a low position on one side, but gives the other to
Black.
'B' avoids strenghening Black.]
LB[pf:B][nc:A]
(;W[nc]C['A' is usual, 'B' and 'C' don't hurt White.]
LB[oe:C][md:B][nd:A]
(;B[nd];W[md]C['A' keeps the top side, 'B' the right side.]
LB[od:B][ld:A]
(;B[ld];W[od];B[ne];W[oe];B[nf];W[of];B[ng];W[qf];B[rf];W[rg])

(;B[od];W[lc];B[mb];W[lb];B[ob];W[ld])
)

(;B[md];W[oe])

(;B[oe];W[lc])
)

(;W[pf];B[qf];W[pg]C[Later, White A or B or Black B.]LB[od:B][nc:A])
)

(;B[pp]C['A', 'B' or 'C'.]LB[od:C][nc:B][lc:A]
(;W[lc])

(;W[nc])

(;W[od])
)
)

(;B[nd];W[qc];B[pc];W[pb];B[rc]
C['A' -> White lives, 'B' -> White dies.]LB[rb:B][od:A]
(;W[od];B[oe];W[qd];B[pe];W[rd];B[ob];W[rb];B[pa];W[qb])

(;W[rb];B[rd])
)

(;B[od];W[nc]C[Black cannot kill on 'A' or 'B'.]LB[nd:B][md:A]
(;B[md];W[qc])

(;B[nd];W[mb]C['A' goes outside, 'B' takes the corner.]LB[lb:B][lc:A]
(;B[lc];W[lb];B[kc];W[qb])

(;B[lb];W[lc];B[md];W[kb];B[nb];W[la];B[ob])
)
)
)

(;W[qc]C['A' is usual, 'B' is not recommended.]LB[rd:B][pc:A]
(;B[pc]
C['A' or 'B' depending on the surrounding stones.
'C' makes a ko.]
LB[rd:C][qf:B][pf:A]
(;W[pf]C['A' is correct, 'B' and 'C' are not good.]
LB[nf:C][qg:B][qf:A]
(;B[qf];W[ph])

(;B[qg];W[qf];B[rf];W[re]C['A' ladder, 'B' ko in the corner.]
LB[rg:B][rd:A]
(;B[rd];W[rg];B[se];W[qh])

(;B[rg];W[pb];B[ob];W[rb])
)

(;AB[qj];B[nf]
C[Even with the marked stone, Black 9 is bad and should be on A.]
LB[nf:9][qf:A]TR[qj];W[qf];B[re];W[pi])
)

(;W[qf]C['A' or 'B'.]LB[pf:B][rf:A]
(;B[rf];W[rg]C['A' or 'B'.]LB[pf:B][qg:A]
(;B[qg];W[pf]C[Same variation as White 12 before 8 and 10.]
LB[qf:8][rg:10][pf:12])

(;B[pf];W[qg]C[Later, White can capture at A in sente.]LB[re:A])
)

(;B[pf];W[qg]C[A and B are miai for White.]LB[pg:B][re:A])
)

(;W[rd];B[re];W[pb]
C['A' is correct.
'B' is correct, if there is an additional Black stone on the
triangled position.]
LB[rb:B][ob:A]TR[kc]
(;B[ob];W[rb];B[pa];W[qa])

(;B[rb];W[qb];B[rc];W[qd];B[sd];W[ra];B[sc];W[nb];B[oe];W[mb]
C[If there is an additional Black stone on the triangled position,
Black kills.
Else Black 11 was a mistake.]
LB[rb:11]TR[kc])
)
)

(;B[rd];W[ob]C[White gets something after 'A' or 'B'.]LB[rb:B][nc:A]
(;B[nc];W[rc];B[pc];W[pb];B[rb];W[sb];B[ra];W[qa])

(;B[rb];W[lc])
)

(;B[re]C[White has a lot of aji in the corner.])
)

(;W[dd];B[qh];W[qc];B[pc];W[rd]C[Black kills on 'A' or 'B'.]
LB[re:B][pb:A]
(;B[pb])

(;B[re];W[pb];B[rb];W[qb];B[ob];W[ra];B[sb];W[se];B[pa])
)

(;AW[kc]LB[oc:A][ob:B][nc:C]C['A', 'B' or 'C'.
]
(;W[oc];B[pc];W[nc]
(;B[ne];W[md])

(;B[md];W[mb];B[lb];W[oe];B[od];W[nd];B[ne];W[me];B[nf];W[ld];B[lc];
W[kb])
)

(;W[ob]LB[pb:A][nc:B]
C['A' saves mosts points, 'B' tries to get all in a ko.
]
(;B[pb];W[nc];B[nd];W[mb])

(;B[nc];W[oc];B[od];W[rc];B[qb];W[qc];B[pc];W[pb];B[rb];W[sb];B[ra];
W[qa];B[pa];W[oa];B[nb];W[qa]C[Ko
])
)

(;W[nc]C['A' or 'B' are ok.
'C' is not recommended.]
LB[md:C][oc:B][nd:A]
(;B[nd];W[mb]C['A' is correct, 'B' is a mistake.]LB[nb:B][oc:A]
(;B[oc];W[nb];B[md])

(;B[nb];W[oc];B[lb];W[od])
)

(;B[oc]C['A' or 'B' are ok.]LB[nd:B][nb:A]
(;W[nb];B[nd];W[mb];B[md])

(;W[nd];B[nb];W[md])
)

(;B[md];W[mb];B[lb];W[ob];B[ma];W[nb];B[lc];W[nd];B[ne];W[pc])
)
)
)

(;B[pj])

(;B[qg];W[qc];B[pc]
C['A' big Ko, 'B' creates a small living group, Black gets better
shape.
'B' isn't possible, if there is an additional Black stone on
the marked position.]
LB[rd:B][qd:A]TR[qi]
(;W[qd];B[qe];W[re];B[rf];W[pe];B[qf];W[pb];B[ob];W[rb];B[pa];W[qa])

(;W[rd];B[qb];W[rb];B[qd];W[rc];B[pb];W[rf]
C['A' or 'B'.
With an additional stone on the marked position, 'C' kills.]
LB[ra:C][qf:B][rg:A]TR[qi]
(;B[rg];W[qf];B[pf];W[ra])

(;B[qf];W[rg];B[rh];W[se])

(;AB[qi];B[ra])
)
)

(;B[qf]
C['A' is correct, leads to life, 'B' is a mistake, makes only a
ko.]
LB[qc:B][pc:A]
(;W[pc]C['A' is usual, 'B' can be possible.]LB[qc:B][oc:A]
(;B[oc];W[qd]
C['A' -> White lives enclosed, 'B' -> fight for the right side.]
LB[qc:B][pe:A]
(;B[pe];W[qb];B[ob];W[re];B[rf];W[rc];B[pb];W[qc])

(;B[qc];W[pb];B[qb];W[pe];B[od];W[qe];B[rf])
)

(;B[qc]LB[nc:B][oc:A]
(;W[oc];B[od];W[qb];B[nc];W[rc];B[qd];W[ob]
C[If this is good for Black, depends on the usefullness of the
triangled stone.]
TR[mc])

(;W[nc];B[nd];W[od];B[oe];W[oc];B[md];W[qd];B[pe];W[qb];B[rc];W[rb];
B[rd];W[mb];B[lb];W[nb])
)
)

(;W[qc];B[pc];W[qd];B[qe];W[pb];B[ob];W[rb];B[pa];W[qa])
)

(;B[qj]C[Two low extensions from the hoshi: bad.
];W[oj]
C[Whtie punishes.
];B[ph];W[qc])
)
)

(;B[nc]
C[
Keima Biraki
--------------

White continues with 'A'. 

White 'B' gives life in a small space, with considerable black
thickness. 

White 'C' and 'D' are not recommended.

After White tenukis 'E', Black closes the corner.


If there is one more additional Black stone on or near the marked 
point, White must play differently. For this case, see the variation, 
where a Black stone on the 3-10-point of the top site is included 
first.
]
LB[dp:E][qd:D][qf:C][qc:B][re:A]MA[qj]
(;W[re]C['A' or 'B'.]LB[rd:B][qd:A]
(;B[qd];W[rd];B[rc];W[rb];B[qc];W[qh])

(;B[rd];W[qd];B[qc];W[qe];B[rc];W[od];B[pc];W[pe])
)

(;W[qc]C[White 4 leaves White with a small corner.];B[qd]
C[White 'b' starts a ko. White 'a' leads to death in the corner.]
LB[rd:b][pc:a]
(;W[pc]
C[White 6 can lead to loss of the game, as White cannot live in
the corner.]
;B[oc]C[White continues with 'a'. White 'b' is a mistake.]
LB[ob:b][rd:a]
(;W[rd];B[re];W[rc]
C['a' lets White live, 'b' tries to kill, but may just drive White
out.]
LB[pb:b][qf:a]
(;B[qf];W[ob];B[nb];W[pb])

(;B[pb]C[White flees on 'A'. 'B' is an overplay.]LB[qe:B][rf:A]
(;W[rf];B[qe];W[se])

(;W[qe];B[rf];W[qb];B[ob];W[sb];B[ra]
C[Unless White can make something with 12, White in the corner
is dead.])
)
)

(;W[ob]C[White 8 is a fatal mistake.];B[nb];W[pa]
C['A' and 'B' kill, but 'B' gives a stone outside.]LB[rc:B][rd:A]
(;B[rd]C['A' or 'B' don't help.]LB[qb:B][rb:A]
(;W[rb];B[na]C[White dies after 'A' to 'D'.]LB[sb:D][ra:C][qa:B][oa:A]
(;W[oa];B[qa];W[pb];B[rc])

(;W[qa];B[rc];W[sb];B[pb]C['A' or 'B' don't help.]LB[qb:B][oa:A]
(;W[oa];B[qb])

(;W[qb];B[oa])
)

(;W[ra];B[oa]C['A' or 'B' don't help.]LB[sb:B][pb:A]
(;W[pb];B[sb])

(;W[sb];B[pb])
)

(;W[sb];B[ra];W[qa];B[pb])
)

(;W[qb];B[rb];W[rc];B[sc])
)

(;B[rc];W[rb];B[qb];W[pb];B[sb];W[rd];B[ra])
)
)

(;W[rd]C[White 5 starts a ko.];B[re];W[rb];B[sd];W[sc]
C[Black has first capture of the ko.

If White loses the ko, it will be difficult for White to make
territory in this part of the board.])
)

(;W[qf]
C[White 4 is the standard approach move. Black continues with 'a'
or 'b'.]
LB[qd:b][rd:a]
(;B[rd];W[qi])

(;B[qd];W[qi])
)

(;W[qd]
C[White 3 is not recommended.

Black continues with 'a'. Black 'b' is not recommended.]
LB[qc:b][qe:a]
(;B[qe]C[White continues with 'a' or 'b'. White 'c' is a mistake.]
LB[qc:c][re:b][pc:a]
(;W[pc];B[od]C[White lives on 'A', less big on 'B' or 'C'.]
LB[rd:C][qc:B][rc:A]
(;W[rc];B[re];W[ob];B[nb];W[qb])

(;W[qc];B[re]C[White continues with 'a'. White 'b' is a mistake.]
LB[ob:b][sb:a]
(;W[sb];B[ob];W[ra])

(;W[ob]C[White 9 is a mistake.];B[sb];W[nb];B[mb])
)

(;W[rd];B[re];W[qb];B[ob];W[sb]C['a' and 'b' are miai.]LB[ra:b][pb:a]
(;B[pb];W[ra])

(;B[ra];W[pb];B[rc];W[rb])
)
)

(;W[re]C['A', 'B' or 'C' are ok.]LB[pe:C][rd:B][qc:A]
(;B[qc];W[rd]C['A' or 'B'.]LB[rc:B][qf:A]
(;B[qf];W[rf];B[qg];W[qb];B[pc];W[rc];B[pb];W[qa])

(;B[rc];W[pe];B[qf];W[pc];B[od];W[rf]
C['A' goes outside, 'B' keeps the corner.]LB[pb:B][qg:A]
(;B[qg];W[pb];B[qb];W[ra]C['A' or 'B' fail.]LB[sb:B][qa:A]
(;B[qa];W[sc];B[pa];W[oa])

(;B[sb];W[qa];B[ob];W[sd];B[oc];W[pa];B[oa];W[sc])
)

(;B[pb];W[qg])
)
)

(;B[rd];W[qc];B[rc];W[pe];B[qf];W[pc];B[od];W[rf]
C['A' keeps the corner, 'B' takes influence.]LB[qg:B][rb:A]
(;B[rb];W[qg];B[pf];W[pg];B[of];W[pk])

(;B[qg];W[rb];B[rg];W[sc])
)

(;B[pe];W[rd];B[rf];W[pc];B[oc];W[pb];B[qg];W[dp];B[rb];W[rc];B[qb];
W[sb];B[ra];W[qc];B[se];W[sd];B[pa];W[ob];B[nb];W[oa];B[sf];W[qa])
)

(;W[qc]C[White 5 is a mistake.];B[re];W[ob];B[nb];W[oc];B[od];W[rb];
B[rd]C[Black 12 prevents White from getting two eyes.])
)

(;B[qc]C[Black 5 is not recommended.];W[qe];B[rc];W[qh])
)

(;W[tt]LB[qe:A][rd:B][qf:C]
C['A' or 'B' are usual.
'C' secures more territory, but is almost always bad: if there are White stones on the sides nearby, a fatal cut is left, if there are no White stones nearby, a placement of a White stone is sente to use that aji and makes Black overconcentrated.
Adding a Black stone on any of the triangled points is wrong.
]
TR[qg][qh][qi][qj][qk]
(;B[qe])

(;B[rd])

(;B[qf];W[qc]LB[re:A][qd:B]C['A' kills, 'B' is a mistake, only ko.
]
(;B[re];W[ob];B[nb];W[oc];B[od];W[rb];B[oa];W[pb];B[sc];W[sb];B[qa];
W[pa];B[ra]LB[nd:A]C[White aji on 'A':
];AW[jc][qj]LB[qf:5]
C[If White is strong, Black 5 was wrong.
];W[nd];B[lc];W[ne];B[le];
W[qd];B[qe];W[pe];B[oe];W[pf];B[of];W[pg])

(;B[qd];W[pc];B[oc];W[rd];B[re];W[rb];B[sd];W[sc])
)
)
)

(;B[jd]C[White 'A', 'B' or tenuki.]LB[qc:B][qf:A][dp:C]
(;W[qf]LB[nd:A][qh:B]C['A' or 'B'.
]
(;B[nd];W[rd];B[pg];W[pf];B[qg];W[of];B[rf];W[re];B[rg];W[oc];B[od];
W[pc];B[qc];W[qd];B[qb];W[nc];B[mc];W[mb];B[lb];W[nb];B[md];W[pb];
B[ng];W[nf];B[mf]
C[Later, taking an outside liberty is sente for Black.]PL[2])

(;B[qh];W[nc];B[qc];W[ph];B[pi];W[pg];B[ne];W[qi];B[qj];W[ri];B[pj];
W[rh])
)

(;W[qc];B[pc];W[qd];B[qe];W[re];B[qb];W[rb];B[rf];W[pe];B[qf];W[pb];
B[ob];W[qa])

(;W[tt]C[White plays elsewhere.
'A', 'B' or 'C'.]LB[qh:C][pi:B][pj:A]
(;B[pj]C[White approaches with 'a' to 'c'.]LB[pf:c][nc:b][qc:a]
(;W[qc];B[qd];W[pc];B[oc];W[ob]C[Black continues with 'a' or 'b'.]
LB[nb:b][nc:a]
(;B[nc];W[nb];B[mc];W[rd];B[re];W[rc];B[qf])

(;B[nb]C[White continues with 'a' or 'b'.
'c' is questionable.]
LB[od:c][rd:b][nc:a]
(;W[nc];B[od]
C[White continues with 'a'. White can also play 'b' and live in
the corner.]
LB[pb:b][mb:a]
(;W[mb]C[Black continues with 'a' or 'b'.]LB[pb:b][nd:a]
(;B[nd];W[na];B[mc];W[nb]
C[Black extending at 'a' is good, but most often Black plays elsewhere.]
LB[lc:a])

(;B[pb];W[na];B[qb];W[nd];B[ne];W[me];B[nf];W[mf]
C['A' is correct, 'B' is a mistake.]LB[mg:B][ng:A]
(;B[ng])

(;B[mg];W[ng]C['A' is necessary, 'B' is another mistake.]
LB[mh:B][pf:A]
(;B[pf])

(;B[mh];W[rc];B[rb];W[rd];B[re];W[oe];B[of];W[pf];B[pe];W[og];B[oe];
W[qe])
)
)
)

(;W[pb]
C[White 14 let White live in the corner. Given Black's overwhelming
thickness, this may not be such a good idea.

Black continues with 'a' or 'b'.]
LB[mc:b][mb:a];B[mb]
C[White continues with 'a'. Anywhere else, such as White 'b', is
a mistake.]
LB[md:b][rd:a]
(;W[rd];B[re];W[rb];B[sd];W[rc])

(;W[md]C[White cannot afford to play anywhere other than the corner.];
B[rb];W[rc];B[rd];W[sc];B[ra];W[qa];B[oa])
)
)

(;W[rd];B[re];W[qe]C['A' to take the corner, 'B' to stay outside.]
LB[pe:B][rc:A]
(;B[od];W[rf];B[rc];W[se];B[rb];W[qh])

(;B[pe];W[rc];B[nd];W[pb])
)

(;W[od]
C[White 'c' shows a special strategy to keep the corner, not necessarily
a wise strategy considering the overwhelming thickness Black
already has.]
;B[nc];W[rd];B[re];W[rb];B[sd];W[rc];B[qf];W[pb])
)
)

(;W[nc]C[Black continues with 'a'. Black 'b' is too easygoing.]
LB[pf:b][oc:a]
(;B[oc];W[nd];B[pf]
C[White continues with 'a'. White 'b' to 'd' are not recommended.]
LB[lc:d][kc:c][jb:b][ld:a]
(;W[ld]C[Black continues with 'a'. Black 'b' lacks force.]
LB[jf:b][kc:a]
(;B[kc];W[je]C[White 10 is one possible continuation.];B[ie];W[jf];
B[kd];W[ke];B[lc];W[nf])

(;B[jf]
C[Black 9 lacks force, and gives White the chance to settle his
group.]
;W[jc];B[ic];W[jb];B[ib];W[kd];B[je];W[ob];B[pb];W[nb])
)

(;W[jb]C[White 8 is feasible, but White gets a low position.];B[jc];
W[kb];B[ib];W[lc];B[ob]C[With Black 13, White is still not settled.])

(;W[kc]C[White 8 is not recommended in this situation.];B[jc];W[kd]
C[Black continues with 'a' or 'b'.]LB[ke:b][je:a];B[ke]
C[The old proverb: at the head of two stone, hane.];W[jb];B[ib];W[kb];
B[je]
C[White can barely make life, and has given Black wonderful thickness.])

(;W[lc]
C[White 8 is small, low, and easily blocked. White should emphasize
instead jumping to the center for life.]
;B[kc])
)

(;B[pf]C[Black 5 is too sedate.];W[pb];B[qc];W[lc])
)

(;W[pf];B[nd];W[qh]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[qe:b][qi:a]
(;B[qi];W[ph];B[nj];W[rd]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[qe:b][qc:a]
(;B[qc];W[rc];B[qe]
C[Black 13 is a continuation which is not recommended until Black
has a more solid position locally. As is, Black 13 is an overplay.]
;W[re];B[qf];W[rf];B[rg];W[rh];B[qg];W[sg];B[qb]
C[White does not have two eyes, but Black also has weaknesses in
his position. Hence, Black should only play this continuation
after fortifying his local position.])

(;B[qe]C[Black 11 is a mistake.];W[re];B[qf];W[rf];B[rg];W[rh])
)

(;B[qe]
C[Black 7 is not recommended.

White slides with 'a'. White 'b' is too submissive.]
LB[qf:b][rj:a]
(;W[rj];B[qf]C[White 'a' are 'b' are possible continuations.]
LB[pk:b][qj:a])

(;W[qf]C[White 8 is submissive.])
)
)
)

(;B[pi];W[pf];B[nd];W[qd];B[qc];W[qe];B[rc];W[nf];B[qg]
C[Black aims for a connection.];W[oh];B[pg];W[og];B[re];W[rd];B[sd];
W[rf];B[qf];W[pe];B[se];W[pc];B[od];W[ob];B[oc];W[pb];B[qb];W[ph];
B[qh];W[qi];B[ri];W[qj];B[rg];W[oj]
C[Black has territory and the connection, White has influence.
After he secured his center group he can still activate the 24-26-28-group.]
LB[pc:24][pb:28][ob:26])

(;B[qh];W[qc];B[pc];W[qd];B[qf];W[rf];B[pe]PL[2])
)
)

(;B[nd]
C[
Ikken Tobi = Hankan Ddwim = Yi Tiao` = 1-Space Jump
----------------------------------------------------

A White single-handed 3-3 invasion is unusual, but possible.

White continues with 'a' or 'b'.
Tenuki 'c' is also possible.
]
LB[dp:c][qd:b][qc:a]
(;W[qc]
C[There are similar variations like these, when Black has an additional 
stone at the marked location included before the one on the 6-4-point.

Black continues with 'a' or 'b'.]
LB[pc:b][qd:a]TR[jc]
(;B[qd];W[pb];B[pc];W[rb]C[Black continues with 'a' or 'b'.]
LB[rc:b][ob:a]
(;B[ob];W[rd];B[re];W[qa];B[sd];W[rc])

(;B[rc];W[qb]
C[Black continues with 'a' to perfect thickness. Black 'b' gives
White a stone with no compensation for Black.]
LB[ob:b][rd:a]
(;B[rd];W[nb];B[mb];W[sb];B[nc];W[ob])

(;B[ob]C[Black 10 gives White a stone with no compensation for Black.]
;W[rd];B[re];W[sc])
)
)

(;B[pc];W[qd];B[qe];W[re];B[qf];W[rf];B[qg];W[pb];B[ob];W[qb])
)

(;W[qd]C[Black continues with 'a' or 'b'.]LB[qc:b][qe:a]
(;B[qe]C[White continues with 'a' or 'b'.]LB[re:b][qc:a]
(;W[qc]
C[Black continues with 'a'. Black 'b' is not generally recommended.]
LB[pc:b][re:a]
(;B[re];W[ob];B[nb];W[oc];B[nc];W[od];B[oe];W[pc];B[pe];W[rd])

(;B[pc]C[Black 6 is generally not recommended.];W[re]
C[Black plays 'a' to take the corner or 'b' for thickness.]
LB[qf:b][rf:a]
(;B[rf];W[qf];B[pe];W[rg];B[rd];W[sf];B[rc];W[ph])

(;B[qf];W[rf];B[qg];W[pb];B[ob];W[qb])
)
)

(;W[re];B[pe]LB[rd:b][qc:a]
(;W[qc];B[rf];W[ob];B[nb];W[oc];B[nc];W[rd];B[qg])

(;W[rd];B[rf];W[pc];B[oc];W[pb];B[qg]
C[White next plays at the marked location, the vital point. White
risks a ko otherwise.]
CR[rb];W[tt]C[White plays elsewhere. Black can get a ko.]CR[rb];B[rb]
C[White continues with 'a'. White 'b' is not recommended, as it
lacks the aji the results from playing 'a'.]
LB[qb:b][rc:a]
(;W[rc];B[qb];W[sb];B[ra];W[qc];B[se];W[sd];B[pa];W[ob];B[nb]
C[White continues with 'a' or 'b'.]LB[sf:b][oa:a]
(;W[oa];B[sf]
C[The liberty at the marked point must be filled before the White
group is faced with a life-and-death ko.]
CR[na])

(;W[sf]
C[White threatens to escape down the side.

Black can pull his stones out 'a', or block White with 'b'.]
LB[sg:b][oa:a]
(;B[oa];W[rg];B[qf];W[rh])

(;B[sg];W[oa]
C[Now White faces an approach move double ko (the marked point
being the approach move).]
CR[na])
)
)

(;W[qb]
C[White 14 is not recommended, as White ends up lacking the aji
of the other variation.]
;B[rc];W[ra];B[sb];W[qc];B[ob];W[pa];B[sd];W[se])
)
)
)

(;B[qc]
C[For continuation see the variation with an additional Black stone 
on the triangled position included first.]
TR[jc])
)

(;W[dp];B[pj]C['A' -> ko on the side, 'B' -> life in the corner.]
LB[qd:B][qf:A]
(;W[qf];B[pg];W[pf];B[og];W[of];B[nf];W[ng];B[nh];W[mg];B[mf];W[mh];
B[qg];W[rg];B[rh];W[re]C['A' -> ko, 'B' -> White lives.]LB[sg:B][rd:A]
(;B[rd]C['A' .-> ko, 'B' -> White dies.]LB[qi:B][qd:A]
(;W[qd];B[qc];W[pe];B[oe];W[rc])

(;W[qi];B[qh];W[pi];B[ri];W[qj];B[rj];W[qk];B[qe])
)

(;B[sg];W[rf];B[qi];W[qc];B[pc];W[qb];B[ni])
)

(;W[qd];B[qe]
C['A' or 'B' give Black the choice where White lives. 
'C' gives Black too much thickness.]
LB[qc:C][pc:B][re:A]
(;W[re]
C['A' White lives on the right side.
'B' White corner with an approach move ko.]
LB[pe:B][qc:A]
(;B[qc];W[rd];B[qf];W[pc];B[oc];W[pb];B[qb];W[pe];B[od];W[rb];B[ob];
W[rc];B[pa];W[rf];B[qg];W[rg];B[qh])

(;B[pe];W[rd];B[rf];W[pc];B[oc];W[pb];B[rb]
C[Later Black can start this approach move ko.];W[rc];B[qb];W[sb];
B[ra];W[qc];B[se];W[sd];B[pa];W[ob];B[nb];W[oa];B[sf];W[qa])
)

(;W[pc]C['A' White lives on the top.
'B' White lives on the right.]
LB[oc:B][od:A]
(;B[od];W[rc];B[re];W[nb])

(;B[oc];W[pe];B[od];W[re];B[qf];W[rf];B[qc];W[rd];B[qg];W[pb];B[qb];
W[rb];B[ob];W[rc];B[pa];W[rg];B[qh])
)

(;W[qc];B[re];W[ob];B[nb];W[oc];B[nc];W[od];B[oe];W[pc];B[pe];W[rd])
)
)
)

(;B[pp]
C[
Ni-Ren-Sei = I-Yeon-Seong = E`r-Lia´n-Xing = Two Star Points
-------------------------------------------------------------

This variation demonstrates joseki in the san-ren-sei and ni-ren-sei fuseki.
'a' = san-ren-sei (three star points)
'b' = ni-ren-sei (two star points)
]
LB[qj:b][cq:a]
(;W[tt]C[White plays elsewhere.];B[pj]
C[
San-Ren-Sei = Sam-Yeon-Seong = San-Lia´n-Xing = Three Star Points
------------------------------------------------------------------

White approaches at 'a'. Approaching at 'b', where Black is strong,
is not recommended. Invading at 'c' immediately is not recommended.

For 'c', see the variation of the invasion onto the 3-3-point 
behind the Hoshi without additional stones.
]
LB[qc:c][qf:b][nc:a]
(;W[nc]
C[Black continues with 'a' to 'e'. 'a' is not recommended for Black.

For 'c', see 'c' here and the same variation without the additional 
Black stones.
For 'd' and 'e', see the same variations without the additional 
Black stones.]
LB[ne:f][jd:e][kd:d][lc:c][pf:b][nd:a]
(;B[nd]C[This is not recommended for Black.];W[md];B[ne]
C[White continues with 'a' to 'c'.]LB[ob:c][pc:b][oc:a]
(;W[oc];B[pc];W[jc])

(;W[pc]C[Black continues with 'a' or 'b'.]LB[qc:b][oc:a]
(;B[oc];W[ob];B[od];W[mb];B[qc];W[pb];B[me];W[ld])

(;B[qc];W[ob];B[pb];W[oc];B[qb];W[jc];B[pf])
)

(;W[ob];B[pc];W[jc])
)

(;B[pf]C[White continues with 'a' or 'b'.]LB[jd:b][pb:a]
(;W[pb];B[qc];W[kc])

(;W[jd])
)

(;B[lc]C[White continues with 'a' or 'b'. 'c' is possible.
]
LB[qc:b][ld:a][qf:c]
(;W[ld];B[kd];W[md]C[Black continues with 'a' or 'b'.]LB[pf:b][jc:a]
(;B[jc]C[White continues with 'a' or tries 'b'.]LB[pf:b][ke:a]
(;W[lf];B[pf];W[ke];B[je];W[jf])

(;W[pf];B[oe];W[lf];B[of];W[ke];B[je];W[jf];B[ie];W[ph])
)

(;B[pf];W[kc];B[jc];W[kb];B[jd];W[lb];B[oc])
)

(;W[qc];B[qd];W[pc];B[od]C[White continues with 'a' or 'b'.]
LB[rc:b][nb:a]
(;W[nb];B[me])

(;W[rc];B[nd];W[nb];B[rd])
)

(;W[qf];B[qc];W[ld];B[kd];W[md];B[of];W[kc];B[jc];W[kb];B[jd];W[lb])
)
)

(;W[qf]
C[The inside approach move is not recommended, as White is starting
a fight where Black is strongest.

This does however demonstrate a high handicap joseki

Black continues with 'A'. Black 'B' is a mistake.]
LB[nd:B][qe:A]
(;B[qe];W[pf]LB[nd:A][nc:B]C['A' is correct, 'B' is not recommended.
]
(;B[nd]
C[White may try 'a', 'b' or 'c'.
'd' is a special case joseki, if White has the lower side.
]
LB[qh:c][rj:b][ph:a][qi:d]
(;W[ph]LB[qj:A][qi:B][ni:C]
C['A' is correct, 'B' is possible, 'C' is completely wrong, because White can live near the edge.
]
(;B[qj];W[mg];B[mi];W[kg];B[me];W[mf];B[ki])

(;B[qi]C['A' or 'B' give White a more broad standing, 'C' doesn't.
]
LB[oj:A][ni:B][mg:C]
(;W[oj];B[ok];W[nj];B[pi];W[oi];B[qh];W[nf];B[pg]C[Mistake.
];W[og];
B[oh];W[nh]C[White pushed into nice shape.
])

(;W[ni];B[nj];W[mj];B[nk];W[mi];B[mk])

(;W[mg];B[nj]
C[The joseki ends here.

The continuation shows a White invasion in the corner. This should
not be attempted as long as the White outside group is weak.]
;W[qc];B[re];W[oc];B[od]C[White can live with 'A', 'B' or 'C'.]
LB[pc:C][nb:B][nc:A]
(;W[nc]
C['A' or, with an additional stone on the triangled position, 'B'.]
LB[pc:B][mc:A]TR[jc]
(;B[mc];W[mb];B[pc];W[pb];B[qb];W[ob];B[rc]C['A' or 'B'.]
LB[kc:B][lc:A]
(;W[lc];B[md])

(;W[kc])
)

(;AB[jc];B[pc];W[pb];B[mc]C['A' lives on the side, 'B' in the corner.]
LB[rb:B][mb:A]
(;W[mb]C[This reverts to the variation where 21 is played before 19.]
LB[mc:21][pc:19])

(;W[rb];B[mb];W[oa])
)
)

(;W[nb]
C['A' closes in the corner from the top side.
'B' pushes White to the top side.]
LB[pc:B][nc:A]
(;B[nc];W[ob];B[mb];W[rc])

(;B[pc];W[pb];B[nc];W[ob];B[rc];W[rb];B[qd];W[qb];B[sb];W[lc])
)

(;W[pc];B[nc]C['A' -> White lives, 'B' -> White dies.]LB[nb:B][rb:A]
(;W[rb])

(;W[nb];B[mb];W[ob];B[sb])
)
)
)

(;B[ni];W[rj]LB[qk:A][qi:B]C['A' encloses, 'B' fails to kill.
]
(;B[qk];W[rk];B[qm])

(;B[qi];W[ri];B[qh];W[rh])
)
)

(;W[rj]
C[Black continues with 'a' or 'b'. Black 'c' and 'd' are mistakes.
]
LB[qj:a][rh:b][qi:c][rk:d]
(;B[qj]C[White continues with 'a'. White 'b' doesn't work.]
LB[rk:b][ri:a]
(;W[ri];B[rk]LB[qh:A][ph:B]C['A' is correct, 'B' is wrong.
]
(;W[qh])

(;W[ph];B[qi]C['A' is correct, 'B' is a mistake.]LB[qh:B][rh:A]
(;W[rh];B[re])

(;W[qh];B[rg])
)
)

(;W[rk]C[White 11 is a mistake.];B[ri];W[qi];B[rh]
C['A' or 'B' don't help.]LB[qh:B][rg:A]
(;W[rg];B[qh];W[pi];B[oi];W[ph];B[pg];W[oh];B[og];W[nh];B[qg])

(;W[qh];B[rg])
)
)

(;B[rh])

(;B[qi]C[Black 10 is a mistake.];W[ri];B[rh];W[qh]
C[Black possibilities are 'a' and 'b'.]LB[rg:b][qg:a]
(;B[qg];W[rg];B[ph];W[sh];B[qh];W[re];B[rd])

(;B[rg];W[pk];B[ph];W[qj];B[pi];W[qn])
)

(;B[rk];W[qk];B[qj];W[rl];B[ri];W[sk])
)

(;W[qh];B[qi];W[ph];B[nj];W[mg]PL[2];W[rg]
C[Later White can live here.];B[re];W[ri];B[rj];W[sh])

(;AW[dp][jp][nq];W[qi];B[qj];W[pi];B[oi];W[oh];B[nh];W[rj];B[rk];W[qk]
LB[pk:A][oj:B]C['A' is correct, 'B' is nonsense.
]
(;B[pk];W[ri];B[ql];W[ni];B[oj];W[og])

(;B[oj];W[rl];B[ri];W[sk];B[rh];W[qg])
)
)

(;AW[dp]C[It is likely that White has the ladder.
];B[nc];W[od]
C[Whtie prepares the punishment.
];B[oc];W[qc]
LB[pc:A][pe:B][qd:C][re:D]
C['A' or 'B' are possible, 'C' is not recommended, 'D' is wrong.
]
(;B[pc];W[re];B[qd])

(;B[pe];W[oe];B[rf];W[pc];B[rd])

(;B[qd];W[pc])

(;B[re];W[pc];B[pe];W[oe];B[rf];W[rg];B[of];W[md])
)
)

(;B[nd]C[White 6 is a mistake.];W[rd];B[qc];W[qh]
C[White easily lives.])
)
)

(;W[qj]C[White 3 is a flexible invasion.];B[ql]
C[White continues with 'a' or 'b'.]LB[qg:b][qf:a]
(;W[qf]C[Black continues with 'a', 'b', 'c' or 'd'.]
LB[nc:d][mc:c][qh:b][nd:a]
(;B[nd];W[rd]C[Black continues with 'a' or 'b'.]LB[qh:b][qc:a]
(;B[qc];W[ph])

(;B[qh];W[qc];B[pc]C[White continues with 'a' to 'c'.]
LB[qg:c][ph:b][rh:a])
)

(;B[qh]C[White continues with 'a' or 'b'.]LB[rh:b][of:a]
(;W[of]C['A' or 'B' are ok.
'C' is not recommended.]
LB[pi:C][nc:B][nd:A]
(;B[nd]
C['A' is correct, 'B' is a mistake with Black 9 played here and
not onto the triangled point.]
LB[nd:9][rd:B][pi:A]TR[nc]
(;W[pi]C['A' is correct, 'B' is inferior.]LB[qe:B][rd:A]
(;B[rd]C['A' gives a clear result, 'B' leads to a difficult fight.]
LB[lc:B][ph:A]
(;W[ph];B[kc])

(;W[lc];B[ph];W[oh];B[oi];W[nh];B[oj];W[rh];B[qi];W[ri];B[rj];W[rk];
B[qk];W[sj];B[pj])
)

(;B[qe]C[Black 10 limits White's incursion into the corner.];W[rf]
C[Black 6 still has considerable aji.];B[kc]PL[2];B[ph]C[Later];W[oh];
B[oi];W[nh];B[oj];W[rh];B[qi];W[ri];B[rj];W[rk];B[qk];W[sj];B[pj])
)

(;W[rd];B[oh];W[qc];B[nf])
)

(;B[nc]
C['A' secures taking the side, 'B' takes more territory on the
side or enters the corner.]
LB[rd:B][pi:A]
(;W[pi];B[rd];W[ph])

(;W[rd]C['A' is correct, 'B' is inferior.]LB[qc:B][pi:A]
(;B[pi];W[qc];B[kc]C['A' is correct, 'B' is questionable.]
LB[qn:B][pj:A]
(;W[pj];B[ni];W[oj];B[ng];W[pl]C['A' or 'B'.]LB[pm:B][qm:A]
(;B[qm]C['A' or 'B'.]LB[pm:B][mk:A]
(;W[mk];B[nf]
C[With two white stones on A and B, White now wants to occupy C
to help his running group.
Later, if necessary, White can connect his two groups on 'D'.]
LB[ph:D][jp:C][dp:B][dd:A];W[ph];B[pg];W[rh])

(;W[pm];B[pn];W[on];B[po];W[mk])
)

(;B[pm];W[om];B[ol];W[nl];B[pk];W[ok];B[pl];W[mk]PL[2])
)

(;W[qn];B[qq];W[pj];B[pm])
)

(;B[qc];W[pi])
)
)

(;B[pi];W[nd];B[nc];W[mc];B[oc];W[md];B[rd];W[id]
C[White later continuations on A or B.]LB[qn:B][pj:A])
)

(;W[rh]
C[Black continues with 'a' to 'c'. Black 'a' is peaceful; 'b' is
a fighting move.]
LB[rg:c][ri:b][nc:a]
(;B[nc];W[ph];B[qe];W[pf];B[rf];W[rg]C[Later, White can live on A.]
PL[2]LB[rd:A];W[rd];B[re];W[qc]LB[pb:B][pc:A]
(;B[pc];W[rb];B[pb];W[qd];B[pe];W[sc])

(;B[pb];W[pc];B[oc];W[qb];B[ob];W[sd]LB[rb:B][qd:A]
(;B[qd];W[rb];B[qa];W[ra])

(;B[rb];W[se];B[sf];W[pe];B[qd];W[od];B[rc];W[sg])
)
)

(;B[ri];W[qi];B[rg];W[ph];B[qg];W[pg];B[pf];W[rf];B[sh];W[qd];B[pe];
W[qc];B[rj];W[pc];B[nd];W[oj])

(;B[rg];W[qg];B[ri]
C['A' makes a living group in the corner, 'B' influence.]
LB[ph:B][rf:A]
(;W[rf];B[qi];W[qd];B[qc];W[pc];B[od];W[pb];B[mc]C['A' or 'B'.]
LB[rd:B][qb:A]
(;W[qb];B[og])

(;W[rd];B[og])
)

(;W[ph];B[qi];W[pi];B[rj];W[rf]
C[Black must now decide; Black 'a' is possible, as are other moves.

White must defend against the cut at the marked point.]
LB[mc:a]CR[pg])
)
)
)

(;B[mc]
C['A' is correct, tenuki 'B' is also possible.
'C' is a mistake.]
LB[qc:C][dp:B][rd:A]
(;W[rd]
C['A' is ok, 'B' is possible, but gives White a very good shape.
]
LB[qh:A][qc:B]
(;B[qh];W[of];B[pi]C['A' or 'B'.
'C' is a mistake.]
LB[oc:C][qg:B][pc:A]
(;W[pc];B[oc];W[qc];B[oe];W[nf];B[jc]C[Later, Black wants to play A.]
LB[re:A])

(;W[qg]C['A' is correct, 'B' and 'C' are mistakes.]
LB[rg:C][rh:B][qc:A]
(;B[qc];W[rh];B[pj])

(;B[rh];W[oc];B[od];W[pc];B[qd];W[qc];B[re];W[nd];B[nc];W[rc];B[qe];
W[md];B[lc];W[ld]C['A' and a cut near 'B' are miai.]LB[sf:B][kc:A]
(;B[kc];W[rf])

(;B[sf];W[kc];B[kb];W[jb];B[jc];W[kd])
)

(;B[rg]C['A' is correct, 'B' is a mistake.]LB[rf:B][oc:A]
(;W[oc]C['A' saves few points, 'B' leads to a disaster.]LB[od:B][rf:A]
(;B[rf];W[od];B[pe];W[oe];B[qe];W[pc];B[pf];W[jc])

(;B[od];W[pc];B[qd];W[qc];B[re];W[nd];B[nc];W[rc];B[qe];W[md];B[lc];
W[ld];B[kc];W[rf];B[sf];W[rh];B[sg];W[ph];B[qi];W[ri])
)

(;W[rf];B[qc];W[rh];B[ri];W[sg];B[qi])
)
)

(;W[oc];B[pc];W[od];B[pe];W[oe];B[pf];W[pg];B[qg])
)

(;B[qc];W[ph])
)

(;W[dp]C['A' or 'B'.]LB[qh:B][qd:A]
(;B[qd];W[ph])

(;B[qh];W[rh]C['A' or 'B'. 'C' is a mistake.]LB[ri:C][qi:B][rg:A]
(;B[rg];W[qg];B[ri];W[rf];B[qi];W[qc];B[qd];W[rd];B[pc];W[rb];B[qb];
W[rc]C[
* GOOD VARIATION *])

(;B[qi];W[ri];B[pj];W[qk];B[pk];W[rl];B[rm];W[pi];B[ph];W[pl];B[qm];
W[oi];B[ok]C['A' or 'B'.]LB[pe:B][oh:A]
(;W[oh];B[pg];W[of];B[pf];W[pe];B[oe];W[qe];B[og];W[od];B[nf];W[pc];
B[nd];W[oc];B[rg];W[qg];B[rj];W[rk];B[sj];W[ng];B[of];W[mf];B[ne])

(;W[pe];B[oh];W[qd];B[pc];W[qc];B[rg];W[qg];B[rj];W[rk];B[sj];W[kc];
B[me])
)

(;B[ri];W[qi];B[rg];W[ph];B[qg];W[pg];B[pf];W[rf];B[sh];W[qd];B[pe];
W[qc];B[rj];W[pc];B[nd];W[oj])
)
)

(;W[qc];B[qd];W[pc];B[od];W[oc];B[rd];W[nc];B[nd];W[mb];B[lc];W[lb];
B[kc];W[kb];B[qh])
)

(;B[nc]C['A', 'B', 'C' and tenuki 'E' are correct, 'D' is inferior.]
LB[dp:E][ph:D][of:C][oj:B][rd:A]
(;W[rd]LB[qh:A][qc:B]
C['A' is ok, 'B' is possible, but gives White a very good shape.
]
(;B[qh];W[of];B[pi];W[qc];B[kc])

(;B[qc];W[ph])
)

(;W[oj];B[qh];W[pg];B[rd];W[ph])

(;W[of];B[qh];W[pi]C['A' is correct, 'B' is inferior.]LB[qe:B][rd:A]
(;B[rd];W[ph])

(;B[qe];W[rf];B[kc])
)

(;W[ph];B[qe];W[pf])

(;W[dp];B[qh];W[rh]C['A'. 'B' and tenuki 'C' are ok.]
LB[de:C][ri:B][rg:A]
(;B[rg];W[qg];B[ri]C['A' is correct, 'B' is a mistake.]LB[ph:B][rf:A]
(;W[rf]C['A' is correct, 'B' is a mistake.]LB[sh:B][qi:A]
(;B[qi];W[qc];B[qd];W[rd];B[pc];W[rb];B[qb];W[rc];B[kd])

(;B[sh];W[ph];B[qi];W[pi];B[rj];W[qc];B[qd];W[rd]
C[White has too much: the corner and influence.])
)

(;W[ph];B[qi];W[pi];B[rj];W[rf];B[rd]C[White has not gained much.])
)

(;B[ri];W[qi];B[rg];W[ph];B[qg];W[pg];B[pf];W[rf];B[sh]
C['A' White takes the corner.
'B' White makes a large sacrifice to gain more strength on the
outside.]
LB[sf:B][qd:A]
(;W[qd];B[pe];W[qc];B[rj];W[oj])

(;W[sf];B[sg];W[rj];B[qe];W[of];B[pe]C[Later, White A, B are sente.]
LB[sk:B][sj:A])
)

(;B[de];W[ph];B[qe];W[pf];B[rf];W[rg])
)
)
)

(;W[qg]C['A' or 'B'.]LB[qe:B][nd:A]
(;B[nd];W[rd]C[White must later cover the marked weak point.]CR[rf])

(;B[qe]C['A' or 'B'.]LB[oj:B][mc:A]
(;W[mc];B[oc];W[jc];B[oj];W[og];B[mg];W[pk];B[nl])

(;W[oj]LB[nd:A][mc:B]C['A' or 'B' are ok.
]
(;B[nd]C['A' or 'B' are ok with support on the top side.]
LB[qc:B][lc:A]
(;W[lc]
C['A' or 'C' keep the corner, 'B' invites White into the corner
to make a strong wall hurting all White outside stones.]
LB[nc:C][rf:B][nb:A]
(;B[nb]C['A' is better than 'B'.]LB[qc:B][rf:A]
(;W[rf];B[re])

(;W[qc];B[rd])
)

(;B[rf]C['A' reduces, 'B' enters.]LB[oc:B][nb:A]
(;W[nb];B[pb];W[og])

(;W[oc]C['A' starts enclosing, 'B' keeps a reduced corner.]
LB[pc:B][nc:A]
(;B[nc];W[nb];B[mb];W[ob];B[mc];W[rc];B[qb];W[qc];B[pc];W[pb];B[rb];
W[ra];B[qa];W[sb];B[sa];W[sc];B[na];W[pa];B[od];W[ra]
C[Black can now attack the White middle group and build something
on the top side. Was taking the corner worth that?])

(;B[pc];W[pb];B[qb];W[ob])
)
)

(;B[nc];W[qc]C['A' or 'B'.]LB[rd:B][pb:A]
(;B[pb]C['A' reduces, 'B' makes the Black corner bigger.]
LB[re:B][rf:A]
(;W[rf];B[re];W[se];B[sd];W[sf];B[rd];W[jd])

(;W[re];B[rf];W[rd];B[qf])
)

(;B[rd]C['A' reduces, 'B' dies.]LB[nb:B][mb:A]
(;W[mb];B[nb];W[na];B[oa];W[ma];B[ob])

(;W[nb];B[mb];W[ob];B[mc];W[rc];B[pb];W[pc];B[oc]
C['A' or 'B' don't live.]LB[ra:B][pa:A]
(;W[pa];B[na];W[qb];B[ra])

(;W[ra];B[sb];W[sc];B[oa];W[qd];B[rf];W[pe];B[pf];W[od];B[oe];W[pd];
B[qf];W[of];B[ne];W[pg];B[og];W[nf];B[rg]C[White dies.])
)
)
)
)

(;W[qc];B[rd];W[oc];B[pc];W[pb]
C['A' drives White to the top side, 'B' encloses a living White
group.]
LB[nb:B][rc:A]
(;B[rc];W[mc];B[qb])

(;B[nb];W[ob];B[nc];W[od];B[oe];W[rc];B[qd];W[rb])
)
)

(;B[mc];W[qc];B[pc];W[re]LB[rd:A][rf:B]
C['A' is correct, 'B' is wrong.
]
(;B[rd];W[rf];B[rc])

(;B[rf];W[rd];B[qf];W[pb];B[ob];W[qb]C[White alive.
])
)
)
)
)
)
)

(;B[lc]PL[2]LB[qf:A][dp:B]C[White 'A' or tenuki.
]
(;W[qf];B[qd])

(;W[tt]LB[pj:A][qj:B]TR[qi][qh][qg][qf][qk]
C[Black 'A' is possible, any of the triangled points and 'B' are wrong.
]
(;B[pj])

(;B[qj]C[Bad
];W[oj]C[Punishment
];B[ph];W[qc])
)
)

(;B[kc]LB[qf:A][dp:B]C[White 'A' or tenuki.
]
(;W[qf];B[qd])

(;W[tt]LB[pj:A][qj:B]TR[qi][qh][qg][qf][qk]
C[Black 'A' is possible, any triangled stone and 'B' are wrong.
]
(;B[pj])

(;B[qj]C[Bad
];W[oj]C[Punishment
];B[ph];W[qc])
)
)

(;B[ic]PL[1];B[qk]
C[If Black has two low extension this far away or more, this way of play is possible. Any more close tow low extension from hoshi are a wrong way to play.
])
)

(;W[qc]
C[
San-san
---------

White 2 is not joseki, but illustrates the possbilities without
considering surrounding stones.
]
;B[qd];W[pc]
C['A' is usual, 'B' closes off the top side or takes sente.]
LB[nc:B][oc:A]
(;B[oc];W[ob]
C[Black continues with 'a' or 'b'. Both end with Black gote.
'c' is only possible with the ladder]
LB[pb:c][nb:b][nc:a]
(;B[nc];W[nb];B[mc]
C[White continues with 'a'.

It is not advisable, but possible for White to play elsewhere
and still live in the corner.]
LB[dp:b][rd:a]
(;W[rd];B[re];W[rc];B[qf]C[The sequence ends.];W[tt]
C[White plays elsewhere.];B[mb]
C[White plays locally at 'a', but can survive after playing elsewhere
('b').]
LB[dp:b][pa:a]
(;W[pa];B[na];W[ra])

(;W[tt]C[White plays elsewhere.

Black may try 'a' or 'b'.]
LB[pa:b][na:a]
(;B[na]C['A' or 'B' are ok.]LB[pa:B][pb:A]
(;W[pb])

(;W[pa];B[ra]C[White continues with 'a' or 'b'.]LB[qa:b][rb:a]
(;W[rb]C['a' and 'b' are miai.]LB[qb:b][qa:a];B[ma];W[qa];B[pb];W[sa];
B[oa])

(;W[qa];B[rb];W[sb])
)
)

(;B[pa];W[pb];B[ra];W[qa];B[qb];W[rb];B[qa];W[oa];B[sd];W[sc])
)
)

(;W[tt]
C[White plays elsewhere. White can still live in the corner in
gote.
Black can attack on 'A' or 'B'.]
LB[rc:B][rd:A]
(;B[rd];W[mb];B[lc]
C[White lives on 'A'. If he doesn't, Black kills on 'B'.]PL[2]
LB[rb:B][rc:A]
(;W[rc])

(;B[rb];W[qb]C['A' kills, 'B' is only ko.]LB[qa:B][pa:A]
(;B[pa];W[lb];B[kb];W[qa];B[la];W[rc];B[sc];W[sb];B[sa])

(;B[qa]C['A' is correct making ko. 'B' simply dies.]LB[pa:B][ra:A]
(;W[ra];B[sa];W[pa];B[rc])

(;W[pa];B[ra])
)
)
)

(;B[rc];W[rb];B[rd]C[White lives on 'A' or 'B'.]LB[sb:B][mb:A]
(;W[mb];B[lc])

(;W[sb]C[White 14 is necessary.])
)
)
)

(;B[nb]C[White continues with 'a' to 'c'.]LB[od:c][rd:b][nc:a]
(;W[nc];B[od];W[mb]
C[Black continues with 'a', possibly 'b'. Black 'a' gives thickness,
Black 'b' the corner.]
LB[pb:b][nd:a]
(;B[nd]C[Black 11 plays for thickness.];W[na];B[mc];W[nb];B[lc])

(;B[pb]C[Black 11 to take the two White corner stones.];W[na];B[qb]
C[Unlikely to realize, but the White stones have some aji at 'a'.]
LB[rc:a])
)

(;W[rd];B[re];W[qe]
C[Black 'a' next keeps things simple for Black and gives him a
good result. Black 'b' is sometimes possible, but Black needs
to be careful.]
LB[pe:b][od:a]
(;B[od];W[rf];B[rc];W[se];B[rb])

(;B[pe]
C[White can now defend at 'a'. Cutting at 'b' does not produce
a good result for White.]
LB[nc:b][rc:a]
(;W[rc];B[qf];W[pb];B[nd]
C[Black gets a thick position and White a living L+2 group.])

(;W[nc]C[White 12 is a mistake.];B[od];W[mb];B[pb];W[na];B[qb]
C[Compared to the usual variation with Black taking the corner,
White 8 and 10 don't serve any purpose.])
)
)

(;W[od]
C[White 8 was played by Kato Masao against Cho Chikun in game 1
of the 21st Judan Title, March 3, 1983.]
;B[nc];W[rd];B[re];W[rb];B[sd];W[rc]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[pb:b][qf:a]
(;B[qf];W[pb];B[oe])

(;B[pb]C[Black 15 is unreasonable.];W[qe];B[pe];W[qf];B[rf];W[pf];
B[oe];W[rg])
)
)

(;B[pb]C['A' if Black has the ladder, else 'B'.]LB[nb:B][qb:A]
(;W[qb];B[nb];W[pa];B[nc])

(;W[nb]
C['A' if Black doesn't have the ladder, else Black may choose 'B'.]
LB[qb:B][rc:A]
(;B[rc];W[qb];B[rb];W[pa])

(;B[qb];W[rc];B[rb];W[rd];B[re];W[od];B[nc];W[qe];B[pe];W[mc];B[nd];
W[oe];B[pf];W[ne])
)
)
)

(;B[nc]C['A' is usual, 'B' is not recommended.]LB[oc:B][nb:A]
(;W[nb]
C[Black can either play 'A' to close off the top side or tenuki,
if he has already secure territory on the right side, after which
later White continues on 'B'.]
PL[2]LB[mc:B][mb:A]
(;B[mb];W[ob];B[mc];W[rd];B[re];W[rc];B[qf])

(;W[mc];B[nd];W[lb])
)

(;W[oc]
C[To close off the top side, Black must play 'A'. 'B' is not recommended.]
LB[od:B][nd:A]
(;B[nd];W[od];B[oe];W[pe];B[rd];W[ne];B[of];W[nb];B[mb];W[ob];B[lc];
W[rc];B[pf]C[White has unnecessarily strenghtened Black's influence.]
PL[2])

(;B[od];W[nb]C['A' is necessary, 'B' is nonsense.]LB[mb:B][mc:A]
(;B[mc];W[mb];B[lc];W[rd];B[re];W[rc]PL[2];B[qf])

(;B[mb];W[mc];B[nd];W[lb];B[ob];W[ma];B[qb];W[rc];B[pb];W[rb];B[ra];
W[oa];B[qa];W[na];B[rd];W[pa])
)
)
)
)

(;W[qi]AB[jc]
C[White may try 2 when Black has already played at top as shown.];
B[qk];W[qf];B[qe];W[pf]LB[nd:A][nc:B]
C['A' is correct, 'B' is also possible without the triangles stone-.
]
TR[jc]
(;B[nd];W[qc]
C[Black continues with 'a', if White is already safe, e.g. with an additional stone on the triangled position, or 'b *', to kill one side. Black 'c' is a special tactic.
]
LB[qd:c][re:b][pc:a]TR[oi]
(;B[pc];W[re]LB[qd:A][rd:B]TR[jc]
C['A' is correct, 'B' is the wrong choice, when Black has a secure base, here garantueed by the triangled stone.
]
(;B[qd]LB[dp:A][rd:B]
C[White should play elsewhere and immediately at 'B' what is only yose.
]
(;W[tt]C[White plays elsewhere.];B[rg]
C[The peep at 13 is not recommended.];W[rf];B[qh];W[ph];B[ri];W[rc]
C[White gets more in the corner.
];B[rd];W[sd];B[sb];W[rb];B[ra];W[qa]
;B[pa]C[Ko
])

(;W[rd];B[rc]
C[Black punishes on 'A', if White  12 was too early.
White's endgame is on 'B'.
]
PL[1]LB[rg:A][rb:B][rd:12]
(;B[rg];W[rf];B[qh];W[ph];B[ri])

(;W[rb];B[qb];W[sc];B[ra];W[qc])
)
)

(;B[rd];W[qd];B[rc];W[pe];B[qb])
)

(;B[re]
C[Black 9 shows an uncompromising attitude. Black accepts a reduction
at top for an attack on the three White stones at right.

* GOOD VARIATION *

]
;W[oc];B[od]C[White lives with 'A', 'B' or 'C'.]LB[pc:C][nb:B][nc:A]
(;W[nc];B[pc];W[pb];B[mc]
C[White continues with 'a' to live in the corner, 'b' to live on
the top.]
LB[mb:b][rb:a]
(;W[rb]C[White 16 to live in the corner.];B[mb];W[oa];B[nf];W[oi];
B[ok])

(;W[mb]C[White 16 to live at top (and give Black the corner).];B[qb];
W[ob];B[rc]C['A' or 'B' are ok.]LB[lc:B][kc:A]
(;W[kc];B[jd];W[md];B[me];W[lc];B[ke]
C[Black gets good outside strength with 25.];W[oi])

(;W[lc];B[md])
)
)

(;W[nb]C['A' is correct, 'B' is questionable.]LB[pc:B][nc:A]
(;B[nc];W[ob];B[mb];W[rc])

(;B[pc];W[pb];B[nc];W[ob];B[rc];W[rb];B[qd];W[qb];B[sb];W[lc])
)

(;W[pc];B[nc]C['A' -> White lives.
'B' -> White dies.]LB[nb:B][rb:A]
(;W[rb])

(;W[nb];B[mb];W[ob];B[sb])
)
)

(;B[qd];W[pb]
C[White 10 is the right move when the time comes, after the White
group on the right is secured.
Black 'A' is usual, 'B' doesn't make sense without extra strength.]
LB[nb:B][pc:A]
(;B[pc];W[rb]C['A' is correct, 'B' doesn't kill.]LB[rc:B][ob:A]
(;B[ob];W[rd];B[re];W[qa])

(;B[rc];W[qb];B[rd];W[nb];B[mb];W[nc];B[mc];W[sb])
)

(;B[nb];W[rd];B[re];W[rc];B[sd];W[rb];B[qa];W[ra];B[pa];W[ob];B[oa];
W[nc];B[mc];W[oc];B[mb];W[od];B[oe];W[ne];B[md];W[pe];B[of];W[rf])
)
)

(;AE[jc];B[nc]LB[qc:A][pb:B]C['A' or 'B' are ok.
]
(;W[qc]LB[pc:A][re:B]C['A' is ok, 'B' is questionable.
]
(;B[pc];W[re];B[qd]LB[dp:A][rd:B]
C[White should play elsewhere and not immediately play 'B'.
]
(;W[tt];B[rg]C[If Black comes here ...
];W[rf];B[qh];W[ph];B[ri];W[rc]
C[... White gets more in the corner ...
];B[rd];W[sd];B[sb];W[rb];
B[ra];W[qa];B[pa];W[sa]C[... a ko.
])

(;W[rd];B[rc]PL[1];B[rg]C[Soon the punishment.
];W[rf];B[qh];W[ph];
B[ri])
)

(;B[re];W[ob];B[nb]LB[od:A][oc:B]C['A' or 'B'.
]
(;W[od];B[oc];W[pc])

(;W[oc];B[od];W[rc];B[nd];W[ra])
)
)

(;W[pb]LB[pc:A][ob:B]C['A' or 'B' are possible.
]
(;B[pc])

(;B[ob])
)
)
)

(;W[qd]C[White 2 is exceptional, used only when 'a' and 'b' are miai.]
LB[qe:b][qc:a]
(;B[qc];W[qe]C[Black continues with 'a' or 'b'.]LB[pc:b][rc:a]
(;B[rc]
C[White continues with 'a'. White 'b' is recommended only if a
Black play at 'c' is not disadvantageous (forcing Black along
the fourth line is generally bad).]
LB[od:c][pe:b][qh:a];W[qh])

(;B[pc];W[qh];B[pe])
)

(;B[qe];W[qc]
C[Black continues with 'a' or 'b', depending upon the side of interest.]
LB[re:b][pc:a]
(;B[pc];W[re]
C[Black continues with 'a' for thickness, or 'b' for the corner.]
LB[rf:b][qf:a]
(;B[qf];W[rf];B[qg];W[pb];B[ob];W[qb];B[nc])

(;B[rf];W[qf];B[pe];W[rg];B[rd];W[sf];B[rc])
)

(;B[re];W[pc];B[od]C[White continues with 'a'. White 'b' is a mistake]
LB[nc:b][oc:a]
(;W[oc]
C[White must crawl once more with 8.

Black continues with 'a'. Black 'b' creates too many cutting
points.]
LB[nc:b][nd:a]
(;B[nd];W[mc];B[md];W[lc];B[pj])

(;B[nc]C[Black 9 leaves one too many cutting points.];W[nb];B[mc];
W[mb];B[lc])
)

(;W[nc]C[White 8 is a mistake.];B[oc];W[ob];B[nb];W[pb];B[mc];W[rb];
B[rd];W[qa]C['a' and 'b' are miai.

Black has superior thickness.]
LB[oa:b][sb:a])
)
)
)

(;W[qh]
C[
Sangen Kakari = Sekan Keolch'im = San Gua`jiao~ = 3-Space Approach
-------------------------------------------------------------------
]
;B[qf]
C[This is the only local continuation for Black. White can approach
on 'A' or 'B'.]
LB[ob:B][nc:A]
(;W[nc];B[pb])

(;W[ob]C['A' or 'B'.]LB[pb:B][pc:A]
(;B[pc];W[lc])

(;B[pb]C['A' is the usual continuation, 'B' is trick move.]
LB[pe:B][pc:A]
(;W[pc]C[Black keeps the corner on 'A' or goes outside on 'B'.]
LB[oc:B][qc:A]
(;B[qc];W[oc];B[qb];W[od];B[pe])

(;B[oc];W[qc];B[od];W[qb];B[nb];W[pa];B[mc])
)

(;W[pe]C[Black plays on 'A' or 'B' or falls into White's trap on 'C'.]
LB[qe:C][oe:B][oc:A]
(;B[oc];W[qe];B[oe];W[pf];B[qd])

(;B[oe]C['A' emphasizes the top, 'B' the right.]LB[qd:B][pc:A]
(;W[pc];B[qc];W[oc];B[qb]C['A' is correct, 'B' is an overplay.]
LB[qd:B][od:A]
(;W[od];B[qd];W[ne];B[of];W[nf];B[og])

(;W[qd];B[od];W[qe];B[pf];W[rf]C[Black captures on 'A' or 'B'.]
LB[rg:B][se:A]
(;B[se];W[rc];B[sd]
C[Black 17 and 19 are a tesuji called patting the racoon's belly.
White 'A', 'B', 'C' or 'D' don't help.]
LB[sd:19][se:17][sc:D][rd:C][sf:B][re:A]
(;W[re];B[rg])

(;W[sf];B[rg])

(;W[rd];B[rb])

(;W[sc];B[rb])
)

(;B[rg];W[rc];B[rb];W[of];B[nf];W[qg];B[og];W[rd];B[nc];W[nb];B[mc];
W[mb];B[lb])
)
)

(;W[qd];B[qc];W[od];B[pc];W[of];B[ne];W[qe];B[pf];W[rf];B[og])
)

(;B[qe];W[pc]C['A' or 'B'.]LB[oc:B][qc:A]
(;B[qc];W[oc]C['A' or 'B'.]LB[od:B][qb:A]
(;B[qb];W[od];B[qd]
C[Now Black 7 is positioned inefficient. White is better than in
the same sequence without playing 6 beforehand.]
LB[qe:7][pe:6];W[og])

(;B[od];W[qb];B[rb];W[pa]
C[As A and B are miai, White gets one follow-up move in sente and
is better.]
LB[nd:B][rc:A])
)

(;B[oc];W[qc];B[od];W[qb];B[nb];W[pa];B[mc])
)
)
)
)
)

(;W[qj];B[ql];W[qf]
C[These variations are included as Hoshi-Tenuki-Nirensei variations.])

(;W[rd]
C[This move is covered as Hoshi-Tenuki-variation with additional
Black stones.])

(;W[re]
C[This move is covered as Hoshi-Tenuki-variation with additional
Black stones.])
)

(;B[oc]
C[
Mokuhazushi = Waemok = Wai`mu` = 5-3 Point
---------------------------------------------------

The mokuhazushi (5-3) point was popular in the Edo period in
Japan (1600 - 1867). It emphasizes influence; territorially,
it is inferior to the 3-4 point. 

Approach moves for White range from 'a *', 'b *' or 'c *'. White
'a' is typical.

After 'a', the 5-3 point can lead to different complicated joseki:
the taisha and the near low pincer. Both can be avoided or simplified.

White 'b' forfeits the corner, and emphasizes the right side,
so locally this is disadvantageous for White. 

White 'c' leads to a division of profit for White and influence
for Black. A ladder helps when playing White 'c'.

White 'd' is played by amateurs who don't know 3,5-point-joseki
and professionals in situations where an equal result in this
corner is unimportant. 'd' is inferior to 'a', 'b' and 'c'.

White 'e' can be played as part of center-moyo-strategy, but
is not joseki, but more like playing a reduction after tenuki
once.

After White plays tenuki 'f', Black can choose between two shimari
and a trick play.
]
LB[dp:f][oe:e][qe:d][qc:c][pe:b][qd:a]
(;W[qd]
C[
Komoku Kakari
-----------------

White 2 is the standard approach because of its solidity and
stability.

Black replies with 'a *', 'b *', 'c *', 'd *', 'e *', 'f *',
'g *', 'h *', 'i *', 'j'

Black 'd' is strategically correct, if there is a Black stone
on the triangled, a White stone on the squared point.

The most difficult of all joseki is the taisha 'i'. Once Black
has played this move, he has only one inferior move to simplify.
So, if he doesn't know the '1000 variations', he may well choose
one of the five pincers, who are much easier. But if he knows
them and White does not, White need not fear Black 'i', because
he still has several opportunities to avoid the complex variations
with an equal or well acceptable result.
'e' is the most complicated of the five pincers, you may well
learn it at least. White can simplify.

'k' is a mistake.

j10, i9, h8, g7, f6, e5, d4, c3, b2, a1

outcomes:
a1, b2, c3, d4 - Black top, White right
e5 - Black right, White top, with some White choice 
f6, g7 - Black top & right, White corner & out
h8 - Black top, White corner & out
i9 - taisha (Black ladder); Black top, White right generally
]
LB[lc:k][ph:j][pf:i][pg:h][qh:g][qg:f][qf:e][ic:d][jc:c][kc:b][pe:a]
TR[cd]MA[ec]
(;B[pe]
C[
Kake (pressing down)
-----------------------

A direct attempt to make the most of Black's superior influence.

Joseki continues with White 'a *'. 

White 'b' may be reasonable given support at top. 
White suffers a terrible loss locally to play elsewhere ('c').

White 'd' is a mistake.
]
LB[qf:d][dp:c][pd:b][qe:a]
(;W[qe]C[Black continues with 'a *' or 'b *'.]LB[pg:b][pf:a]
(;B[pf]C[White continues with 'a *', possibly 'b'.]LB[qf:b][qg:a]
(;W[qg]
C[Black continues with 'a *', 'b *', 'c *', 'd' or 'e'.

e5, d4, c3, b2, a1]
LB[ic:e][qc:d][pg:c][qf:b][jc:a]
(;B[jc]C[
* GOOD VARIATION *];W[pg];B[og];W[oh];B[ng];W[nh];B[mg];
W[qf]C['a' is a key point for both players.]LB[od:a];B[je]
C[A post-joseki extension.];W[od];B[pd];W[pc];B[pb];W[qc];B[nd];W[ob];
B[nc];W[nb];B[mb];W[qb];B[na];W[pa]
C[Black continues with 'a'. Black cannot afford to play elsewhere
('b').]
LB[dp:b][lc:a]
(;B[lc])

(;B[tt]
C[Black plays elsewhere, a mistake.

White continues with 'a' or 'b'. Both lead to the same result.]
LB[mc:b][ne:a]
(;W[ne];B[oe];W[mc];B[md];W[lc];B[lb];W[ld]C['a' and 'b' are miai.]
LB[kb:b][me:a])

(;W[mc];B[md];W[ne];B[oe];W[lc];B[lb];W[ld]C['a' and 'b' are miai.]
LB[kb:b][me:a])
)
)

(;B[qf];W[rf];B[rg];W[rh];B[pg];W[qh];B[re];W[sg];B[qc];W[rd];B[jc]
C[
* GOOD VARIATION *];W[pd]C[Later];B[od];W[ne])

(;B[pg];W[qh];B[ph];W[pi]
C[Black continues with 'a' or 'b *'.
'c *' brings the same variations as 'b *'.
]
LB[qf:b][oi:a][qi:c]
(;B[oi];W[oj];B[qf];W[rf];B[re];W[rg];B[qc];W[rd];B[pj];W[qi];B[ni])

(;B[qf];W[rf];B[qi]C[White continues with 'a *', 'b *' or 'c'.]
LB[qj:c][pc:b][oi:a]
(;W[oi];B[ri];W[rh];B[sh];W[rg];B[qk];W[qc];B[ne]
C[
* GOOD VARIATION *])

(;W[pc];B[pb];W[qb];B[pd];W[qc];B[ri]
C[White continues with 'a *' or 'b'.]LB[rh:b][rg:a]
(;W[rg];B[pj];W[oi];B[oj];W[ni];B[nd]C[
* GOOD VARIATION *])

(;W[rh];B[si];W[rg];B[pj];W[oi];B[oj];W[ni];B[nd])
)

(;W[qj];B[ri];W[rh];B[sh];W[rg];B[rj];W[qk];B[rk];W[ql];B[rl];W[qm];
B[rm];W[qn]C[Black continues with 'a' and 'b'.]LB[rc:b][rn:a]
(;B[rn]C[White continues with 'a'. White 'b' is a fatal mistake.]
LB[qo:b][pc:a]
(;W[pc];B[pb];W[qb];B[pd];W[qc];B[oi];W[pj];B[qo];W[po];B[pp];W[qp];
B[ro];W[op];B[pq];W[oq];B[oo];W[pn];B[pr];W[no])

(;W[qo]C[White 28 is a mistake.];B[oi];W[pj];B[qb]
C[White 'a' is the obvious response, but does not work. Neither
does the more promising looking 'b'.]
LB[rb:b][ro:a]
(;W[ro];B[rc]C[Black wins the capture race.])

(;W[rb];B[qc];W[rc];B[ra];W[se];B[rd]
C[Neither 'a' nor 'b' work for White.]LB[sd:b][sb:a]
(;W[sb];B[sd];W[sg];B[pd])

(;W[sd];B[sb];W[re];B[sg];W[ro];B[so];W[sn];B[sp];W[rp];B[sm];W[sq];
B[si];W[sk];B[pd];W[sn];B[so];W[sp];B[qa];W[sn];B[sa])
)
)
)

(;B[rc]C[White continues with 'a'. White 'b' is a mistake.]
LB[rn:b][qc:a]
(;W[qc]
C[The following sequence, from White 28 to Black 37, is a one-way
street.]
;B[qb];W[pb];B[rb];W[pc];B[ob];W[pa];B[rd];W[re];B[qa]
C[White continues with 'a'. White 'b', leads to a ko White can
win. White 'c' is a mistake. If White has an additional stone on the triangled position, Black 13 was wrong and is punished on 'd'.
]
LB[mb:d][sd:c][od:b][sb:a][qi:13]TR[pp]
(;W[od]C[Black may try the obvious 'a', or 'b'.]LB[nd:b][pd:a]
(;B[pd];W[nc];B[nb];W[mb];B[mc];W[na];B[nd];W[oa];B[oe];W[lb]
C[Now, the captures at 'a' and 'b' are miai.]LB[rn:b][sd:a])

(;B[nd];W[mb]C[White threatens escape as in the other variation.];
B[oa];W[pd];B[mc];W[oe]C[White cannot be caught.])
)

(;W[sb];B[sa];W[ra];B[pd];W[sd];B[sa];W[oa]
C[White hates to make this play, reinforcing Black, but has no
choice, lacking other other ko threats.]
;B[mb];W[ra];B[oi];W[pj];B[sa];W[nb];B[nc];W[ra];B[rn];W[sc];B[qo];
W[po];B[pp];W[qp];B[ro];W[op];B[pq];W[oq];B[oo];W[pn];B[pr];W[no])

(;W[sd]C[White 38 is a mistake. White loses.];B[sc];W[sa];B[se];W[sf];
B[oa];W[sd];B[pd])

(;AW[pp];W[mb];B[rn];W[ro];B[sn];W[si])
)

(;W[rn]C[White 28 is a mistake.];B[rd];W[re];B[qc]
C[White cannot evade capture.])
)
)
)

(;B[qi]LB[oi:A][pc:B][qj:C]
C[White continues with 'A *', 'B *' or 'C'.
]
(;W[oi];B[qf];W[rf]LB[rf:14][qf:13][qi:11][oi:12]
C[Same variation as Black 13, White 14 played before Black 11, White 12, see there for continuation.
])

(;W[pc];B[qf];W[rf]LB[pc:12][qi:11][qf:13][rf:14]
C[Same variation as Black 13, White 14 played before Black 11, White 12, see there for continuation.
])

(;W[qj];B[ri];W[rh];B[qf];W[rf]LB[qf:15][rf:16][qi:11][qj:12]
C[Same variation as Black 15, White 16 played before Black 11, White 12, see there for continuation.
])
)
)

(;B[qc];W[pg];B[pd];W[ng];B[qf];W[rf];B[rc]
C[White may play elsewhere, sacrificing the two stones.])

(;B[ic]
C[Black can make an extra wide extension. In this situation, White
simply plays 'A' and is reluctant to push at 'B', as in variation
1, as Black builds even better thickness towards the wide extension.]
LB[pg:B][qc:A]
(;W[qc]
C[White 8 aims at an invasion at the marked location, where link-up
or escape are possibilities.]
CR[mc])

(;W[pg];B[og];W[oh];B[ng];W[pi];B[nh];W[ni];B[mi];W[nj];B[mj];W[nk];
B[qf];W[rf];B[rg];W[re])
)
)

(;W[qf]
C[White 6 is a special strategy, intending to make a splitting
play between Black strength at the top left and right. Black
continues with 'a', or, anticipating White playing at 'b', Black
plays there first. In other words, 'a' and 'b' are miai.]
LB[jc:b][pg:a]
(;B[pg]C['A' or 'B'.]LB[qh:B][jc:A]
(;W[jc]
C[White 8 makes sense as a splitting attack if Black has strength
in the upper left as well as the upper right as shown.]
;B[qg];W[qb]C[White 10 allows White to live in the corner.])

(;W[qh];B[jd])
)

(;B[jc];W[pg];B[og];W[oh];B[ph];W[qg];B[ng];W[oi])
)
)

(;B[pg]
C[Black plays 5 for rapid devlopment.

White continues with 'a *'. White 'b' and 'c' are mistakes.]
LB[pd:c][qf:b][pf:a]
(;W[pf]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[qf:b][of:a]
(;B[of];W[qf]C[Black continues with 'a *', 'b *' to 'd'.]
LB[qh:d][qg:c][ng:b][og:a]
(;B[og]C[White continues with 'a *'. White 'b' is not recommended.]
LB[qh:b][pc:a]
(;W[pc]C[Black continues with 'a *'. Black 'b' is too mild.]
LB[nd:b][ob:a]
(;B[ob]C[Black 11 threatens encroachment into the corner.];W[qh];B[jc]
C[
* GOOD VARIATION *


'a' is now a good point for both players.]
LB[pi:a])

(;B[nd]
C[Black 11 is not recommended. White can easily make life in the
corner.]
;W[ic]
C[Being secure in the corner, White plays the extension at top
first, spoiling Black's thickness.

The marked location is gote for Black.]
CR[qg])
)

(;W[qh]C[White 10 is premature.];B[qc];W[rc];B[qg];W[rg];B[pd];W[qb];
B[pc];W[re];B[jd])
)

(;B[ng];W[oh];B[og];W[pc];B[ob];W[qh];B[jc]C[
* GOOD VARIATION *];
W[tt]C[White plays elsewhere.];B[ph]
C[Black continues with 16 to build further thickness.];W[qi];B[oj])

(;B[qg];W[og];B[oe];W[pc];B[ob];W[oh];B[rg];W[pb];B[qj])

(;B[qh];W[og];B[oh];W[ng];B[nh];W[mg];B[ne])
)

(;B[qf]C[Black 7 is a mistake.];W[of];B[qg];W[pd];B[oe];W[od];B[ne];
W[nd])
)

(;W[qf]C[White 6 is a mistake.];B[pf];W[qh])

(;W[pd]C[White 6 is vulgar.];B[od];W[pf];B[of];W[oe];B[ne]
C[Neither White 'a' nor 'b' are good.]LB[pe:b][og:a]
(;W[og];B[pe];W[qf];B[oe])

(;W[pe]C[White has terrible shape.];B[ng])
)
)
)

(;W[pd]C[White 4 only makes sense with surrounding support.];B[od];
W[oe]
C['A' is the joseki, but unknown to amateurs, who oftenly play 'B'.
Both moves end with White having a small corner territory and
a cutting stone, while Black has both sides, but not totally
secured.
]
LB[qe:B][pf:A]
(;B[pf];W[ne]
C[Black continues with 'a' or 'b'. Black 'b' if White does not
have a pincer at top (giving Black room to make life).]
LB[re:b][qb:a]
(;B[qb]LB[rf:A][rb:B]C['A' is correct, 'B' is wrong.
]
(;W[rf]LB[qg:A][rc:B]C['A' is ok, 'B' is possible.
]
(;B[qg];W[rb];B[pb];W[rc]C[Black continues with 'A' or 'B'.
]
LB[rg:A][lc:B]
(;B[rg];W[re];B[lc];W[ng];B[pk])

(;B[lc]LB[ng:A][rg:B]C['A' is ok, 'B' is questionable.
]
(;W[ng];B[rg];W[re];B[pj])

(;W[rg];B[qi];W[qh];B[ph];W[rh];B[le];W[ng];B[oj])
)
)

(;B[rc]
C[If you are high-dan and know the follow-up. mail it to me please: kogo@waterfire.us.
]
;W[qg];B[re];W[qe];B[qf];W[rd];B[rg];W[se];B[pg];W[qh];B[rh];W[ph];
B[og];W[ri];B[lc];W[le])
)

(;W[rb];B[qc];W[rc];B[qe]C[W dead.
])
)

(;B[re];W[rd];B[og];W[qe]C[If White tries pushing through.];B[rf];
W[qf];B[qg])
)

(;B[qe];W[re];B[rf];W[rd];B[qg];W[pb];B[ob];W[rb])
)

(;W[tt]
C[White plays elsewhere. This is conceivable only when Black 3
is a ko threat.]
;B[qe];W[qi]
C[Black must play 'a' to capture White 2. White can live in the
corner if Black plays elsewhere ('b').]
LB[cq:b][qg:a]
(;B[qg])

(;B[tt]C[Black plays elsewhere. White can live in the corner.];W[pd];
B[od];W[re];B[rf];W[rd];B[qg]C[Black must defend.];W[pb]
C[Allowing White life in the corner.];B[ob];W[rb])
)

(;W[qf]
C[White 4 is a mistake, perhaps from confusion with the 3-4 variation
in the Shusaku joseki of Black pressing after White tenuki.]
;B[qe];W[re]C[Black continues with 'a' or 'b'.]LB[rf:b][pd:a]
(;B[pd];W[rd];B[og];W[qg];B[jd]
C[Black gets good position with a shape having no defects. White
is too low.])

(;B[rf];W[rg];B[rd];W[sf];B[pd]C[Black gets corner profit.])
)
)

(;B[kc]
C[
Sangen Biraki = Sekan Peollim = Chai San = 3-Space Extension
-------------------------------------------------------------

Three spaces is the minimum extension. Two spaces is too mild,
as White attaches against the 5-3 stone.

White can play at 'a *' through 'c *', or play elsewhere.
]
LB[dp:d][mc:c][pf:b][pe:a]
(;W[pe];B[tt]C[Black plays elsewhere.];W[mc]
C[Black continues with 'a' or 'b *'.]LB[oe:b][mb:a]
(;B[mb];W[lb];B[lc];W[nb];B[md];W[nc];B[nd];W[od];B[ob];W[ma];B[oa];
W[na];B[kb];W[pc];B[oe];W[pd];B[of])

(;B[oe];W[of];B[ne]
(;W[pc];B[ob];W[pg];B[ld]C[
* GOOD VARIATION *])

(;W[ld]C[Trying to escape with White 9 is a costly overplay.];B[pf];
W[pg];B[qf];W[qg];B[re]C['a' and 'b' are miai.]LB[rg:b][rd:a]
(;W[rd];B[rg]C[White loses.])

(;W[rg];B[rd])
)
)
)

(;W[pf]C[Black may play elsewhere after this.];B[qc];W[rc];B[pd]
C[White continues with 'a' or 'b'.]LB[qb:b][qe:a]
(;W[qe];B[tt]C[Black plays elsewhere.];W[qb]
C[Black continues with 'a'. Black 'b' is too submissive.]
LB[pc:b][pb:a];B[pb])

(;W[qb];B[qe];W[pc]C[Black continues with 'a'. Black 'b' is timid.]
LB[pe:b][rd:a]
(;B[rd]C['A' or 'B'.]LB[od:B][qc:A]
(;W[qc];B[pe];W[ob];B[nc])

(;W[od];B[qc];W[pb]
C[Black continues with 'a', or the fierce fighting move of 'b'.
Black must have the ladder to play 'b'.]
LB[nc:b][oe:a]
(;B[oe];W[nd];B[pe];W[mc])

(;B[nc]C[Black must have the ladder to play 15.];W[qd];B[pe];W[oe];
B[qf];W[md];B[mc];W[qg];B[rg];W[pg];B[rh];W[re];B[rf];W[sd]
C[Black plays 'a' with a favorable ladder. Without the ladder,
Black must play 'b', and let White make good shape.]
LB[qj:b][of:a]
(;B[of]
C[Black 29 starts a squeeze play. Black must have the ladder to
play this way.]
;W[oh]C[White 30 is correct shape.];B[me]
C[Black 31 is a tesuji to squeeze White into bad shape.];W[nf];B[ne];
W[og];B[nd];W[of];B[pi])

(;B[qj]
C[Black 29 is necessary if Black does not have a favorable ladder,
leaving White the opportunity to make good shape toward the center.]
;W[ld];B[lc];W[ng])
)
)
)

(;B[pe]C[Black 11 is not recommended. Black gives up too much.];W[ob];
B[nc];W[re];B[qf];W[pi])
)
)

(;W[mc]
C[Black continues with 'a *' or 'b *'. Black 'c' is submissive.]
LB[mb:c][pe:b][oe:a]
(;B[oe]C['A *' is correct, 'B' is wrong.]LB[qg:B][pf:A]
(;W[pf]C['A *' or 'B'.]LB[qc:B][ld:A]
(;B[ld];W[pc];B[ob]
C[
* GOOD VARIATION *


White continues with an extension near 'a'. White cannot afford
to play elsewhere ('b').]
LB[dp:b][qj:a]
(;W[qj]
C[Depending on the position, White may extend one space further
than 10, as White 'a' forces Black 'b'.]
LB[ne:b][of:a])

(;W[tt]
C[White plays elsewhere, a mistake.

Black continues locally with 'a'. Black 'b' is a mistake.]
LB[of:b][ph:a]
(;B[ph];W[of];B[ne];W[pb]
C[White must play 13 to secure a base in the corner.])

(;B[of]
C[Black 10 is a mistake, allowing White to solidify on the right.];
W[pg])
)
)

(;B[qc];W[rc];B[qb];W[pd];B[od];W[qi];B[ld])
)

(;W[qg];B[qc];W[rc];B[qb];W[pd];B[od]
C[White must make a slow move to secure his group. If he plays
elsewhere, he will suffer a lot.]
;W[dp];B[re];W[rd];B[qf];W[pf];B[rg];W[qh];B[rh]
C['A' -> White on the run, 'B' -> White dies.]LB[qi:B][pe:A]
(;W[pe];B[qi])

(;W[qi];B[pe];W[qe];B[rf];W[ri];B[rb])
)
)

(;B[pe]C[White continues with 'a *' or 'b *'.]LB[pd:b][qe:a]
(;W[qe];B[pf];W[qg];B[ld]C[
'A *' is correct, 'B' is a mistake.]
LB[md:B][pc:A]
(;W[pc];B[pd];W[qc];B[ob];W[pg];B[ne]C[
* GOOD VARIATION *])

(;W[md]C[White 10 is not recommended.];B[me];W[ne];B[nf];W[nd];B[pg];
W[pd];B[qf]
C[The result favors Black.

Though Black has cutting points, the threat of a Black play at
the marked location keeps White from losing liberties by squeezing
Black using the group of White stones on the left (without first
connecting).]
MA[od])
)

(;W[pd];B[od];W[oe];B[ne];W[of];B[md];W[pf]C[
* GOOD VARIATION *];
B[tt]C[Black plays elsewhere.];W[ic]
C[If White makes an approach here, Black must respond at 'a'. Black
cannot afford to play elsewhere ('b').]
LB[dp:b][jc:a]
(;B[jc];W[id])

(;B[tt]C[Black plays elsewhere, a mistake.];W[lc];B[kd];W[ld];B[le];
W[ke]
C[Black continues with 'a' if Black has a favorable ladder to the
lower left. Black 'b' is a mistake.]
LB[kb:b][lf:a]
(;B[lf];W[kb];B[je]
C[If Black does not have the ladder, Black is in trouble.])

(;B[kb]
C[Black 19 is a mistake. Black gets squeezed, give White massive
thickness.]
;W[lf];B[me];W[mf];B[je];W[kf];B[mb];W[nf];B[nd];W[jd])
)
)
)

(;B[mb]
C[Black 5 is not recommended.

White can consider 4 as a forcing play and continue at 'a', play
elsewhere, or, with a favorable ladder, play 'b'.]
LB[lb:b][pe:a]
(;W[pe];B[md];W[pc];B[ob])

(;W[lb]C[White must have the ladder to play this way.];B[lc];W[nb];
B[md];W[nc];B[nd];W[od];B[pd];W[oe]
C[Black continues with 'a' if the ladder is favorable, or 'b' if
not.]
LB[pc:b][pe:a]
(;B[pe]
C[White plays 'a' with a favorable ladder. Without a favorable
ladder, White must play 'b' - with a result favoring Black.]
LB[pf:b][pc:a]
(;W[pc];B[ob];W[ma];B[of])

(;W[pf]
C[White plays 16 if the ladder to the lower left is unfavorable.];
B[pc];W[qe];B[ob];W[ma];B[oa];W[na];B[qf];W[of];B[qc];W[kb];B[jc];
W[qg];B[jb];W[ka];B[rf])
)

(;B[pc]C[Black plays 15 when the ladder is not favorable.];W[pe];B[ob]
;W[ma];B[oa];W[na];B[qc];W[kb];B[jc];W[rd];B[rc];W[jb];B[ic]
C[The result favors White.

Further, White can get a seki in the corner.])
)
)
)

(;W[tt]C[White plays elsewhere.

Black pincers with 'a' or 'b'.]
LB[qg:b][qf:a]
(;B[qf];W[pe];B[pf];W[ne];B[of];W[oe];B[md])

(;B[qg];W[pe];B[qj]
C[White continues with 'a', possibly 'b'. White 'a' is preferred
as White is out more in the center, and, as seen in variation
'a', likely has a chance to defend the corner with 'b' after
playing 'a'.]
LB[pc:b][of:a]
(;W[of]C[White 7 aims at invading.];B[md]C[Black defends...];W[pc]
C[...so White protects the corner.])

(;W[pc]C[White defends the corner.])
)
)
)

(;B[jc]
C[
Yongen Biraki = Nekan Peollim = Chai Si` = 4-Space Extension
-------------------------------------------------------------

The choice between the three and four-space extension is mainly
influenced by the position in the top-left corner. White has
no particularly severe attack against the wider extension.

White can answer at 'a *', 'b *' through 'd *', 'e *' or play
elsewhere (f).
]
LB[dp:f][ld:e][md:d][qg:c][pf:b][pe:a]
(;W[pe]C[White continues with 'a *' or 'b', or plays elsewhere.]
LB[dp:c][nd:b][md:a]
(;B[md]C[
* GOOD VARIATION *];W[pc];B[od];W[pg]
C[If White omits this move, Black can play on A.]LB[qb:A])

(;B[nd])

(;B[tt]C[Black plays elsewhere. White attacks with 'a' or 'b'.]
LB[lc:b][nd:a]
(;W[nd];B[nc];W[ld];B[mc];W[ne];B[lc];W[qj])

(;W[lc]C[White 6 is a sacrifice to fix up his shape in the corner.];
B[oe];W[of];B[ne];W[pc];B[pb];W[qb];B[le])
)
)

(;W[pf]C[Black continues with 'a *'. Black 'b' is too mild.]
LB[md:b][qc:a]
(;B[qc];W[rc];B[pd]C[White continues with 'a *', possibly 'b'.]
LB[qb:b][qe:a]
(;W[qe];B[qb];W[qj]C[
* GOOD VARIATION *])

(;W[qb];B[qe];W[pc];B[rd];W[qc];B[pe];W[od];B[oe];W[nd];B[nc]
C[Black's prospects in the ensuing fight are good.])
)

(;B[md]C[Black 5 is too defensive.];W[pc];B[od];W[qi])
)

(;W[qg]
C[White 4 provides stability. It is played when White cannot expect
to develop down the right side from the high diagonal or knight
move. With this move the right side is played out. Black is in
no hurry to respond.]
;B[pf];W[qf];B[qc];W[rc];B[pd];W[qe];B[qb])

(;W[md];B[oe];W[pf]C[Black continues with 'a' or 'b *'.]LB[ph:b][kd:a]
(;B[kd];W[mf];B[mc];W[nd];B[nc];W[od];B[pc];W[qc];B[pd];W[pe])

(;B[ph]
C[White continues with 'a *' or 'b *'.
'b *' is an invention of Wu Qingyuan = Go Seigen against Takagawa Kaku in a game in1956.
]
LB[pg:b][of:a]
(;W[of];B[ne];W[pc];B[ob];W[ng];B[me]C[
* GOOD VARIATION *];W[pk])

(;W[pg]C[Black continues with 'a *' or 'b'.]LB[qh:b][oh:a]
(;B[oh];W[nf]C[Black continues with 'A *' or 'B'.
'C' is a mistake.
]
LB[qc:A][mb:B][of:C]
(;B[qc];W[rc];B[ne]C['A *' is correct, 'B' is a mistake.]
LB[me:B][ng:A]
(;W[ng];B[me];W[pc];B[ob]
C[
* GOOD VARIATION *

'A' is a possible continuation, 'B' is possible to take sente.
]
LB[pk:A][kd:B]
(;W[pk]C[Possible continuation.
];B[mi])

(;W[kd];B[jd]LB[lf:A][ke:B]C['A' or 'B' are possible.
]
(;W[lf];B[kc];W[pk];B[mi])

(;W[ke];B[lc]LB[pk:A][kc:B]
C['A' is possible, 'B' is not recommended.
]
(;W[pk];B[mi])

(;W[kc];B[kb]LB[jb:A][lb:B]C['A' or 'B'.
]
(;W[jb];B[lb];W[ib];B[hc];W[hb];B[gc])

(;W[lb];B[mb];W[jb];B[la];W[ib];B[hc];W[hb];B[gc])
)
)
)
)

(;W[me];B[of];W[og];B[qe];W[pe];B[pd];W[rd];B[ng])
)

(;B[mb];W[pc];B[ob];W[ng])

(;B[of];W[og];B[ng];W[ne];B[od];W[qh];B[qi];W[rg];B[mg];W[kd]
C[Black in trouble.
])
)

(;B[qh];W[nf];B[mb];W[pc];B[ob];W[nh])
)
)
)

(;W[ld]C[Black continues with 'a *' to 'c'.]LB[pe:c][nd:b][of:a]
(;B[of];W[qg]C[
* GOOD VARIATION *])

(;B[nd];W[pf];B[lc];W[qj])

(;B[pe]C[White continues with 'a' or 'b'.]LB[qe:b][pd:a]
(;W[pd];B[od];W[oe];B[ne];W[of];B[md];W[pf];B[lc])

(;W[qe];B[pf];W[qg];B[je];W[lf];B[pg];W[qh];B[ph])
)
)

(;W[tt]C[White plays elsewhere. Black continues with 'a' or 'b'.]
LB[qg:b][qf:a]
(;B[qf];W[pe];B[pf];W[ne];B[of];W[oe];B[md]C[White plays 'a' or 'b'.]
LB[pj:b][pc:a])

(;B[qg];W[pe];B[md];W[of];B[qj];W[pc];B[ob];W[pb]
C[White 12 is necessary to secure his base in the corner, the price
for paying elsewhere earlier.])
)
)

(;B[ic]
C[
Goken Biraki = Daseochkan Peollim = Chai Wu~ = 5-Space Extension
-----------------------------------------------------------------

The maximum extension for Black. Black's choice of this extension
is influenced by the position in the top-left corner.

White can answer 'a *', 'b *' or 'c'. Playing elsewhere is ot
favorable, as Black can make effective use of this five-space
extension. This is a relaxed extension so there are no fierce
variations.
]
LB[ld:c][pf:b][pe:a]
(;W[pe]C['A *' or 'B'.]LB[nd:B][md:A]
(;B[md]C[
* GOOD VARIATION *])

(;B[nd];W[ne];B[me];W[nf];B[ld];W[qj])
)

(;W[pf];B[ld]C[
* GOOD VARIATION *];W[pc]C[Later.];B[od])

(;W[ld]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pe:b][of:a]
(;B[of]C['A' is correct, 'B' is strenghening Black.]LB[oe:B][qg:A]
(;W[qg])

(;W[oe];B[ne];W[pe];B[nd];W[nf];B[mf];W[ng];B[le];W[og];B[ie])
)

(;B[pe]C[Black 5 is not recommended.];W[pd];B[od];W[oe];B[ne];W[of];
B[md];W[le]
C[Black cannot connect on the third line at 'a', and pushing at
'b' is bad, as Black extends along the fifth line.]
LB[nf:b][lc:a])
)
)

(;B[qf]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

The aim of playing the close pincer of Black 3 is mainly to build
influence on the right. Therefore a Black position in the lower
right corner is desirable when making this pincer.

White replies range from 'a *', 'b *', 'c *', 'd *' or 'e'. White
'a' is most popular. The other moves indicate a special strategy.

White cannot play elsewhere, as Black 'a' gives White a very
unfavorable result.

White 'e' is the simplifying variation. It gives a secure corner
territory for influence and sente. It isn't considers joseki,
because, White gets completely surrounded.
]
LB[pc:e][qe:d][od:c][pf:b][pe:a]
(;W[pe];B[pf]
C[White continues with 'a *', 'b *' or 'd'. White 'c' and 'e' have
also been played professionally.]
LB[of:e][pc:d][oe:c][nd:b][ne:a]
(;W[ne]
C[The combination of White 4 and 6 was invented by Shusaku, who
mentioned in a letter that he contemplated the moves for six
hours before playing them.

Black continues with 'a *', possibly 'b'. In the game where Shusaku
first played the move (in 1853), his opponent, Ota Yuzo, played
at 'c'.]
LB[lc:c][md:b][of:a]
(;B[of]C[White continues with 'a *' or 'b *'.]LB[nc:b][oe:a]
(;W[oe];B[lc]
C[
* GOOD VARIATION *

White continues with 'a', 'b *', 'c' or 'd'.
'e' is a mistake.]
LB[pb:e][pc:d][pj:c][ob:b][md:a]
(;W[md];B[mc];W[pc]
C[Black continues with the tesuji at 'a'. The simple extension
at 'b' is a mistake.]
LB[pj:b][rc:a]
(;B[rc]
C[Black 13 is a sacrifice tesuji to help Black settle at top.
'A' is joseki, 'B' is a mistake.]
LB[rd:B][ob:A]
(;W[ob]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[rd:b][nb:a]
(;B[nb];W[od];B[nc];W[rd];B[pb];W[qb];B[oa];W[rb];B[pj])

(;B[rd]C[Black takes much of the corner....];W[nc]
C[... but White easily gets good eye shape.];B[ic])
)

(;W[rd];B[pb];W[qb];B[qc];W[pd];B[rb];W[ob];B[qa];W[nc];B[nb];W[od];
B[oa])
)

(;B[pj]C[Black 13 is a mistake (though not an obvious one).];W[nb];
B[nc];W[ob];B[ic])
)

(;W[ob]
C[Black continues with 'a *' or 'b'. Black 'c' is not recommended.]
LB[nb:c][pc:b][pb:a]
(;B[pb];W[nc];B[nb];W[mb];B[oa];W[mc];B[rb];W[ld]
C[
* GOOD VARIATION *])

(;B[pc];W[nc]
C[Black continues with the sacrifice at 'a'. Black 'b' just makes
Black heavy.]
LB[nd:b][nb:a]
(;B[nb];W[mb];B[nd];W[mc];B[md];W[lb];B[od];W[kc];B[ld];W[nf])

(;B[nd]C[Black 13 is a mistake.];W[nb];B[md];W[qc];B[od];W[pb])
)

(;B[nb]C[Black 11 is too mild.];W[pb]LB[jc:a];B[jc]
C[Black must play at top. White at 13 would put Black in considerable
difficulty.]
;W[pj]
C[Now White can ruin Black's hoped-for extension.

The cutting point at the marked location remains.]
CR[nc])
)

(;W[pj];B[mg]
C[White has a joseki continuation at 'a'. White 'b' is also playable,
but gives Black an attack on the corner.]
LB[le:b][md:a]
(;W[md];B[mc];W[pc]
C[The joseki move is 'a'. If Black plays tenuki ('b'), White can
easily settle his stones and grab a bigger corner.]
LB[dp:b][rc:a]
(;B[rc];W[ob];B[nb];W[od];B[nc];W[rd];B[pb];W[qb];B[oa];W[rb])

(;B[tt]C[Black plays elsewhere.];W[nb];B[nc];W[ob];B[ic])
)

(;W[le]C[White 12 gives Black an opportunity to tear into the corner.]
;B[qc];W[rc];B[pb];W[qb];B[pc]
C[Black 'a' and 'b' are now forcing moves.]LB[re:b][rf:a])
)

(;W[pc];B[rc];W[ob];B[rd])

(;W[pb];B[pc];W[qc];B[ob];W[nf];B[ng];W[mg];B[nh])
)

(;W[nc]C[Black continues with 'a *'. Black 'b' is also possible.]
LB[mc:b][nb:a]
(;B[nb];W[mc];B[pc];W[oe]C['A *' or 'B' give the same result.]
LB[qc:B][mb:A]
(;B[mb]C[
* GOOD VARIATION *

'A *' is correct, 'B' is inferior.]
LB[lc:B][kc:A]
(;W[kc]C[Black continues with 'a *'. Black 'b' is premature.]
LB[qc:b][lc:a]
(;B[lc];W[ld];B[lb];W[kd];B[qc];W[rd];B[pj]C[
* GOOD VARIATION *];
W[mg];B[tt]C[Black plays elsewhere.];W[kb]C[White 23 is not sente.];
B[tt]C[Black plays elsewhere.];W[rb];B[oa])

(;B[qc]AB[pp][dd]AW[eq][cp]
C[Black 15 is out of order. 

Ishida Yoshio made this mistake against Rin Kaiho in game 2 of
the 1971 Honinbo Title match.]
;W[rd];B[lc];W[ld];B[lb];W[pj]
C[White 20 breaks up Black's position.

The game continued with 'a'. Ishida commented later that a Black
cut at 'b' was fighting spirit.]
LB[kd:b][qm:a]
(;B[qm]C[Game continuation.];W[mg];B[oi];W[kd]
C[White is already in better position.];B[oj];W[pl]
C[The game continued with Black 'a'. Ishida later commented that
'b' was a better continuation for Black.]
LB[nl:b][ql:a]
(;B[ql]C[Game continuation.];W[ok];B[qk];W[pk];B[mj];W[pm];B[pn];W[on]
;B[po];W[mm])

(;B[nl]C[Suggested improvement over the game continuation.];W[pm];
B[qn];W[nm];B[mm];W[nn];B[ql])
)

(;B[kd]C[Suggested improvement over the game continuation.];W[le];
B[jd];W[mi])
)
)

(;W[lc]C['A' is correct, 'B' is a mistake.]LB[qc:B][lb:A]
(;B[lb];W[kc];B[qc];W[rd];B[pj])

(;B[qc];W[rd];B[pj];W[lb]C['A' is necessary, tenuki 'B' is wrong.]
LB[dp:B][rc:A]
(;B[rc])

(;B[dp];W[rb];B[oa];W[ma])
)
)
)

(;B[qc];W[rd];B[mb];W[kc];B[lc];W[ld];B[lb];W[kd])
)

(;B[mc]AB[dp][pq][qo]AW[ec][cd][jq]
C[This variation is from a 1959 Japanese professional game (Sugiuchi
(White) versus Nakamurs (Black)).]
;W[nb];B[nd];W[md];B[od];W[oe];B[ob]
C[White continues with 'a'. White 'b' is unreasonable.]LB[mb:b][lc:a]
(;W[lc];B[mb];W[lb];B[na];W[me];B[qb];W[pj]
C[Locally, the result is rougly equal, but White should be satisfied
with the influence at top, as well as breaking up Black's position
on the right.])

(;W[mb]C[White 16 is a mistake.];B[lc];W[lb];B[kc];W[kb];B[me];W[ld];
B[mf];W[kd];B[qb];W[rb];B[qc];W[rc];B[qe];W[pd];B[rd];W[re];B[sd];
W[se];B[nf];W[sc];B[rd];W[sd];B[ra];W[pa];B[qa];W[oa];B[pc];W[rd];
B[rf]
C[White can start a ko at 'a', but he has no ko threats, and so
loses.]
LB[sa:a])
)
)
)

(;B[md]
C[Black 7 is a pattern developed by Kitani disciples.

'A' is modern Korean fighting style. 'B' is old Japanese safety
style.
'C' is inferior to 'A'.
White 'D' is not recommended.]
LB[of:D][pj:C][pc:B][me:A]
(;W[me];B[ld];W[pj];B[of];W[nd];B[nc];W[pc])

(;W[pc];B[me]
C[White continues with 'a'. White 'b' is not recommended.]
LB[nf:b][nc:a]
(;W[nc];B[nf];W[nd])

(;W[nf]C[White 10 is not recommended.];B[od];W[oe];B[pi])
)

(;W[pj];B[oi];W[qn]
C[Professional game examples of continuations include 'a' and 'b'.]
LB[me:b][qb:a]
(;B[qb]C[Game continuations include 'a' and 'b'.]LB[lf:b][pi:a]
(;W[pi]AB[pp][dd]AW[eq][cp]
C[Rin Kaiho (w) versus Fujisawa Shuko = Fujisawa Hideyuki in game 2 of the 1970 Meijin
title.]
;B[og];W[me];B[ld];W[mg];B[oj];W[pk];B[mi];W[kg];B[ki]
C[White should continue with 'a', but Rin played 'b'.]LB[ig:b][ke:a]
(;W[ke]C[White 22 is the vital point in this shape.];B[jc];W[hf])

(;W[ig]C[Game continuation. White 22 is thin.];B[ke]
C[White 17 is the vital point, aiming at 'a' and 'b'.]LB[jg:b][lf:a];
W[he];B[ii];W[gg]
C[The game continued with 'a', but the splitting move of 'b' is
possible.]
LB[jg:b][dg:a]
(;B[dg]
C[Rin Kaiho (w) versus Fujisawa Shuko = Fujisawa Hideyuki in game 2 of the 1970 Meijin
title. Game continuation.]
;W[nq];B[pn];W[pm];B[qo];W[on];B[po];W[qm];B[np];W[mp];B[no];W[or];
B[pr];W[pq];B[qq];W[oq];B[nl];W[jq];B[cn];W[nd];B[nc];W[hc];B[jc];
W[kf];B[eo];W[cl];B[fq];W[fr];B[er];W[ep];B[dr];W[fp];B[gq];W[gr];
B[hr];W[hq];B[gp];W[ir];B[hp];W[iq];B[cq];W[dp];B[fo];W[bp];B[bo];
W[go];B[ho];W[gn];B[do];W[hn];B[io];W[jn];B[jo];W[ko];B[in];W[co];
B[dn];W[bn];B[bm];W[ao];B[cm];W[bl];B[im];W[el];B[fm];W[br];B[al];
W[ak];B[am];W[fl];B[gm];W[di];B[hh];W[je];B[bk];W[ck];B[aj];W[gh];
B[hg];W[hf];B[gi];W[eh];B[fi];W[eg];B[df];W[dc];B[ec];W[cd];B[ed];
W[cc];B[gf];W[fe];B[be];W[ce];B[bf];W[eb];B[fb];W[da];B[ef];W[ff];
B[fa];W[bd];B[bb];W[ad];B[gc];W[ab];B[gd];W[ge];B[hd];W[kn];B[ri];
W[rj];B[qi];W[ph];B[rg];W[qj];B[rn];W[rm];B[ro];W[oh];B[nh];W[ng];
B[qh];W[pg];B[rd];W[rc];B[re];W[qc];B[qr];W[hj];B[hi];W[hl];B[hm];
W[bi];B[lp];W[mo];B[lo];W[ln];B[mq];W[mn];B[lq];W[mr];B[lr];W[kp];
B[ls];W[jk];B[jj];W[kk];B[gl];W[lj];B[ik];W[li];B[rb];W[fk];B[pc];
W[hk];B[gk];W[il];B[jl];W[ij];B[gj];W[ik];B[cj];W[dj];B[ci];W[bj];
B[ch];W[ak];B[bq];W[cr];B[bk];W[kr];B[op];W[ak];B[dk];W[dl];B[bk];
W[ns];B[ps];W[ak];B[fh];W[fg];B[bk];W[ks];B[os];W[ak];B[hs];W[is];
B[bk];W[kq];B[nr];W[ak];B[dq];W[aq];B[bk];W[nq];B[ms];W[ak];B[ar];
W[as];B[bk];W[an];B[jm];W[ak];B[lh];W[ll];B[kh];W[mh];B[bk];W[of];
B[sc];W[ak];B[ej];W[ek];B[bk];W[jh];B[ji];W[ak];B[mk];W[lk];B[bk];
W[id];B[ic];W[ak];B[fs];W[gs];B[bk];W[cf];B[cg];W[ak];B[bs];W[cs];
B[bk];W[jd]C[White wins by resignation.])

(;B[jg];W[jf];B[kf];W[jh];B[lg];W[ph];B[oh];W[lh];B[lf];W[ji];B[li];
W[jj]
C[White 38 gives White good center position, which is a good reason
for Black to reserve the splitting move that begins this sequence
until later.])
)
)

(;W[lf]AB[dd][pp]AW[cp][eq]
C[Hane (w) versus Takagawa in the 1973 Pro Best Ten title.];B[ld];
W[pc];B[pb];W[od];B[nd];W[of];B[pi];W[qj];B[qi]
C[White is thin in the upper right, but has sente.];W[nq]
C[Black has a move at 'a', while White can later aim at 'b'.]
LB[kd:b][rd:a]
(;B[rd]
C[White now faces a dilemma: if he tries to prevent Black from
connecting, he faces a ko which he cannot afford to lose, owing
the his thin shape.])

(;B[tt]
C[Later in the game, if White has secured his shape in the upper
right corner...]
;W[nc]C[... a setup move.];B[ob];W[kd]
C[White plays a tough forcing move.

This is only possible with a more established shape than shown
for White's stones in the upper right.]
;B[kc];W[jc])
)
)

(;B[me]AB[dc][gc][dg][pp]AW[ce][ef][dk][cq]
C[Black 11 was played by Ishida Yoshio against Iwata in game 4
of the 1971 Pro Best Ten playoff.]
;W[pc];B[fh];W[fd];B[fc];W[cc];B[cb];W[dd];B[ec];W[bc]
C[Black continued with 'a'.

Blocking at 'b' would have been a mistake.]
LB[nf:b][od:a]
(;B[od]C[Game continuation.];W[oe];B[pi];W[nd];B[nc];W[pb];B[qj];W[qq]
C[White 22 is big.

White has left the cut at 'a' for later.]LB[mc:a])

(;B[nf]
C[Blocking at 21 makes Black overconcentrated in light of White
8.];
W[nc])
)
)

(;W[of]C[White 8 is not recommended.];B[ph];W[pc];B[od])
)

(;B[lc]AB[cd][ec][qo]AW[pq][co][dq]
C[Shusaku versus Ota Yuzo in game 17 of what was supposed to be
a 30-game title match; 1853-06-05.]
;W[pk];B[of];W[oe];B[mg];W[md];B[mc];W[pc]
C[Black continued with 'a', but should have played the placement
of 'b' first.]
LB[rc:b][oo:a]
(;B[oo]C[The actual game continuation.];W[kd]
C[Because Black failed to play in the corner, White gets the forcing
move of 16.]
;B[jc];W[mq];B[nk];W[pi];B[nf];W[qm];B[mo];W[qh];B[lq];W[lr];B[nq];
W[kq];B[nr];W[lp];B[pm];W[pl];B[om];W[qn];B[ro];W[pn];B[po];W[np];
B[op];W[on];B[no];W[ld];B[nm];W[kn];B[ni];W[ci];B[dj];W[di];B[ej];
W[bk];B[eq];W[ep];B[fq];W[dp];B[go];W[hq];B[gq];W[hp];B[fo];W[fm];
B[hr];W[ir];B[dr];W[cr];B[fr];W[hm];B[cs];W[bs];B[ds];W[bq];B[gs];
W[is];B[hs];W[cf];B[gl];W[gm];B[ei];W[nb];B[nc];W[ob];B[ic];W[rn];
B[dg];W[cg];B[jf];W[bd];B[bc];W[dd];B[cc];W[de];B[ik];W[ge];B[hf];
W[gf];B[gg];W[fg];B[gh];W[gc];B[hd];W[eb];B[dc];W[fc];B[be];W[gb];
B[db];W[fh];B[gi];W[eh];B[mb];W[lf];B[lg];W[mp];B[oq];W[so];B[sp];
W[sn];B[rq];W[kl];B[re];W[rc];B[kk];W[jl];B[jk];W[kf];B[kg];W[ho];
B[rg];W[rh];B[ed];W[ee];B[cl];W[ck];B[dl];W[dk];B[en];W[bl];B[ag];
W[gk];B[hk];W[ml];B[ll];W[mm];B[mk];W[lm];B[bh];W[fl];B[gj];W[ie];
B[he];W[je];B[if];W[hc];B[id];W[ib];B[jb];W[em];B[dn];W[bf];B[af];
W[ce];B[ad];W[cn];B[ek];W[ja];B[fd];W[gd];B[fe];W[ff];B[ch];W[dh];
B[ea];W[fb];B[mf];W[me];B[sh];W[si];B[sg];W[rj];B[bj];W[cj];B[bi];
W[lk];B[lj];W[oh];B[lo];W[ko];B[nh];W[rd];B[ka];W[ia];B[na];W[pb];
B[kc];W[se];B[oj];W[pj];B[fk];W[jd];B[cm];W[bm];B[gn];W[hn];B[il];
W[im];B[mr];W[fa];B[da];W[oa];B[ma];W[ms];B[ns];W[ls];B[ak];W[al];
B[aj];W[og];B[fi];W[hl];B[pg];W[od];B[gk];W[ll]C[White wins by 3.])

(;B[rc])
)
)

(;W[nd]
C[Black continues with 'a' or 'b *'. Black 'c' is not recommended.]
LB[qc:c][nc:b][mc:a]
(;B[mc]C[White continues with 'a' or 'b'.]LB[qj:b][pc:a]
(;W[pc];B[pb];W[qb];B[md])

(;W[qj];B[of];W[oe];B[nf];W[md];B[lc];W[ld];B[kc];W[lf])
)

(;B[nc];W[md];B[mc];W[ld];B[kc]C['A *' or 'B'.]LB[qj:B][pi:A]
(;W[pi];B[of];W[oe];B[nf];W[lf]C[
* GOOD VARIATION *])

(;W[qj];B[nf];W[oe];B[of];W[lf])
)

(;B[qc]C[Black 7 is too territory oriented in emphasizing the corner.]
;W[rc];B[pc];W[oe];B[rb];W[rd];B[mb];W[qj];B[ng];W[ld])
)

(;W[oe]
C[White 6 was played by Fujisawa Shuko = Fujisawa Hideyuki against Yoshio Ishida in
the 1974 Meijin league. The game continuation follows.]
;B[of];W[ne];B[lc];W[pk];B[tt]C[Black plays elsewhere.];W[md];B[mc];
W[pc];B[rc];W[ob];B[nb];W[od];B[nc];W[rd];B[pb];W[qb];B[oa];W[rb])

(;W[pc]C['A' or 'B'.]LB[nd:B][oe:A]
(;B[oe];W[ob];B[od];W[nb])

(;B[nd])
)

(;W[of]C[Sakata Eio 9P played the move against Kitani Minoru 9P 1959.]
;B[oe];W[od];B[ne];W[nd];B[og];W[md];B[nf];W[pc])
)

(;W[pf]
C[Black continues with 'a *'. Black 'b' is playable, but not so
good by itself.]
LB[qg:b][pg:a]
(;B[pg]C[White continues with 'a *', 'b *' or 'c'.]
LB[od:c][of:b][pe:a]
(;W[pe]C['A *', 'B' or 'C'.]LB[og:C][lc:B][qh:A]
(;B[qh]C[White continues with 'a *' or 'b'.
'c' is a mistake.]
LB[mc:c][nd:b][lc:a]
(;W[lc]
C[Black continues with 'a *' or 'b'. Black 'c' is not recommended.]
LB[qb:c][nd:b][ng:a]
(;B[ng];W[nd]C[
* GOOD VARIATION *];B[rc]
C[This is Black's continuation from the joseki.];W[qc];B[qb];W[pb];
B[rb];W[pc];B[rd])

(;B[nd];W[nf];B[ld];W[kd];B[le];W[mc];B[ne];W[og])

(;B[qb]C[Black 'c' is not recommended.];W[nf]
C[Black continues with 'a'. Black 'b' and Black lives in the corner
in gote.]
LB[og:b][rc:a]
(;B[rc];W[og];B[oh];W[nh];B[oi];W[ni];B[oj];W[rd])

(;B[og];W[nd];B[rc];W[rd];B[nc];W[mc];B[qc])
)
)

(;W[nd]
C[If White wants to play a good point elsewhere, he can take sente
with White 8. The idea is to switch elsewhere, answering Black
lightly if he plays locally.]
;B[mc]
C[White may play elsewhere ('a'), or make Black overconcentrated
while getting good shape ('b').]
LB[nc:b][dp:a]
(;W[tt]
C[White plays elsewhere.
'A' surrounds a living White group. 'B' makes a low living Black
position to hunt White.]
LB[qb:B][md:A]
(;B[md]C[Black's continuation when White plays elsewhere.];W[pc];B[od]
;W[rf];B[nf];W[rg];B[qg];W[qe]
C[Black 'a' rounds off Black's shape, but may not be necessary.]
LB[nh:a])

(;B[qb];W[nc];B[nb];W[ob];B[pb];W[od];B[oa];W[le])
)

(;W[nc];B[nb];W[ob];B[pb];W[od];B[oa];W[le])
)

(;W[mc];B[ng];W[ne];B[rc];W[qc];B[qb];W[pb];B[rb];W[pc];B[rd]
C[Now, the triangled White stone is one line too narrow.]TR[mc])
)

(;B[lc];W[qg];B[qh];W[rg];B[ph];W[rf]
C[Later continuations are Black A or White B.]LB[pc:B][qb:A])

(;B[og];W[ne];B[lc];W[qg];B[qh];W[rg];B[rh];W[rf])
)

(;W[of]C[Black continues with 'a *' to 'c *'.]LB[qe:c][og:b][qg:a]
(;B[qg];W[od]
C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[nd:b][pc:a]
(;B[pc];W[pd]
C[Black continues with 'a *'. Black 'b' and 'c' are not recommended.]
LB[nd:c][qc:b][mc:a]
(;B[mc]C[
* GOOD VARIATION *];W[qk];B[pj];W[pk];B[oj];W[ok];B[nj];
W[mf];B[jc])

(;B[qc]C[Black 11 is not recommended. White gets superior thickness.];
W[nc];B[nb];W[mc];B[mb];W[lc];B[qk];W[lb])

(;B[nd]
C[Black 11 is pointless, as White already has a solid position.];W[qc]
C[Letting White play 12 in sente is a loss for Black.];B[mc];W[mf]
C[White 14 makes sente of 'a' and 'b'.]LB[pj:b][jc:a])
)

(;B[nd]C[Black 9 is not recommended.];W[pc]
C[Black continues at 'a'. Black 'b' is not recommended.]LB[oe:b][nc:a]
(;B[nc];W[ne];B[ld];W[qe];B[qk];W[jc])

(;B[oe];W[pe];B[pd];W[pb]
C[Black continues with 'a' or 'b'; neither is appealing.]
LB[od:b][qe:a]
(;B[qe];W[od]
C[Black will have to have a very big ko threat for White not to
take Black 11 (the marked location).]
CR[ne])

(;B[od];W[qe])
)
)
)

(;B[og]C[White continues with 'a'. White 'b' is a mistake.]
LB[nf:b][od:a]
(;W[od]C[Black continues with 'a'. Black 'b' is an overplay.]
LB[nf:b][pc:a]
(;B[pc];W[pd];B[mc]
C[White continues with the hane at 'a'. The cut at 'b' is a mistake.]
LB[qg:b][ng:a]
(;W[ng]
C[White 12 is the crucial point for both sides.
'A' creates a snall group, 'B' influences the right side.]
LB[nh:B][qi:A]
(;B[qi];W[ld];B[lc];W[kd];B[jc];W[nh]C[If Black 'a', White 'b'.]
LB[mf:b][nf:a])

(;B[nh]
C[The move was played by Honinbo Shuwa against Honinbo Shusaku,
Oct 14th 1849.]
;W[qg];B[qh];W[rg];B[mg];W[nf];B[rh];W[rf];B[oi])
)

(;W[qg]C[White 12 is a mistake.];B[qh];W[rg];B[rh];W[rf];B[ng]
C[Black takes the crucial point.])
)

(;B[nf]C[Black 9 is an overplay that gives White a big corner.];W[nd];
B[ng];W[pc]C[The cut at 'a' is still and issue.]LB[qg:a])
)

(;W[nf]C[White 8 is a mistake.];B[qe];W[pd];B[ng];W[mf];B[lc])
)

(;B[qe];W[pd]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[pe:b][od:a]
(;B[od];W[pe];B[qh];W[pc];B[kc]
C[
* GOOD VARIATION *

The joseki ends.];W[mc]
C[This is not much help for White now.];B[md];W[ob];B[nc];W[nb];B[mb])

(;B[pe]C[Black 9 is a mistake.];W[od]
C[White easily gets superior territory by sacrificing the two stones.]
;B[oe];W[nd];B[ne];W[md])
)
)

(;W[od]
C[White 6 is a light way of playing.

Black continues with 'a' or 'b'.]
LB[nd:b][pc:a]
(;B[pc];W[of];B[pd];W[qe];B[qg];W[pe]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[qc:b][nd:a]
(;B[nd];W[qc];B[og];W[nf];B[ld])

(;B[qc]C[Black 13 is not recommended.];W[md]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[nd:b][mb:a]
(;B[mb];W[nh];B[pj]C[White 'a' is a severe follow-up move.]LB[lb:a])

(;B[nd]C[Black 15 is not recommended.];W[nc];B[oe];W[ne];B[od];W[mc])
)
)

(;B[nd]C[White continues with 'a'. White 'b' is a mistake.]
LB[pc:b][of:a]
(;W[of]C[Black continues with 'a' or 'b'.]LB[pd:b][pc:a]
(;B[pc];W[pd];B[qc];W[qg];B[qh];W[rg];B[ph];W[rf])

(;B[pd];W[pc];B[oe];W[pe];B[od];W[qg];B[qh];W[rg];B[qc];W[rc];B[pb];
W[rh];B[rd];W[qe];B[rb])
)

(;W[pc]C[White 8 is a mistake.];B[oe];W[pd]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nc:b][pe:a]
(;B[pe]C[White continues with 'a'. White 'b' is unreasonable.]
LB[ne:b][nc:a]
(;W[nc];B[md]
C[White takes at 'a'. Not taking the stone ('b') is a mistake.]
LB[dp:b][ob:a]
(;W[ob];B[lc])

(;W[tt]C[White fails to take at 'a'.]LB[ob:a];B[ob]
C[Black aims to sacrifice the two stones to get thickness by squeezing
White.]
;W[nb];B[mb];W[pb];B[mc];W[oa])
)

(;W[ne]C[White 12 is a mistake.];B[nc];W[me];B[kc]
C[White does not have a good follow-up.

White would like to play 'a', causing Black 'b', which threatens
Black playing 'c'; that would be a disaster.]
LB[rd:c][qe:b][of:a])
)

(;B[nc]C[Black 11 is a mistake.];W[of]C[White splits Black in two.])
)
)
)
)

(;B[qg]
C[The idea behind Black 5 is not to give White momentum, but the
move does little for Black either.]
;W[pe]C['a' and 'b' are miai.]LB[pi:b][lc:a];B[lc];W[pi]
(;B[pg];W[og];B[ri];W[nd]C[A sente forcing move by White.];B[nc];W[qj]
;B[rj];W[qk]C[Black has a low position on the right.])

(;B[qi]
C[Black can play 9 with a favorable ladder.

White continues with 'a' if the ladder is unfavorable to White,
or 'b' if the ladder is favorable.]
LB[qj:b][nd:a]
(;W[nd];B[nc];W[pj];B[qj];W[pk];B[qk];W[pl])

(;W[qj]C[White must have the ladder to play this way.];B[pj];W[qh];
B[ri];W[oi];B[rh];W[pk];B[oh];W[oj]
C[The ponnuki is excellent shape for White.];B[og];W[pc]
C[White secures the corner in sente.];B[od])
)
)
)

(;W[od]
C[White 4 is a simple move that gives a less satisfactory result
than variations 'a' and 'b'.]
;B[nd]C[White continues with 'a *' or 'b'.]LB[pf:b][oe:a]
(;W[oe];B[pc];W[qe]
C[Black continues with 'a *' if he doesn't bother about the right
side.
'b *' is the traditional move to develop the right side.
'c' is an alternative to 'b' in virtue of better shape and a
trick move.
Black 'd' is mistake.]
LB[pf:d][qh:c][pg:b][qc:a]
(;B[qc]
C['A *' is joseki. 'B' is possible, if White is strong in the lower
right.]
LB[ne:B][qh:A]
(;W[qh]
C[
* GOOD VARIATION *

Now 'A' is a big sente move for both sides. Another continuation
for Black is 'C'.]
PL[2]LB[qg:C][ne:A]
(;B[ne];W[pf];B[jc]
C[Eight points for White have been solidified, but Black has gained
more points.])

(;W[ne];B[md]
C[White prevented a big Black sente move and capture Black 3, who
cannot escape on A now, although his aji may used more indirectly.]
PL[2]LB[qf:3][qg:A];B[qg];W[ph];B[of];W[og];B[nf];W[pf];B[pg];W[pe];
B[oh];W[ng]LB[nh:B][mf:A]
(;B[mf];W[nh]LB[rh:B][oi:A]
(;B[oi];W[rg])

(;B[rh];W[ri];B[rg];W[oi];B[re];W[rd];B[sf];W[sh];B[me];W[si];B[sg]
C['A' is correct, 'B' is wrong.]LB[rc:B][sd:A]
(;W[sd];B[rc];W[se];B[pd];W[rf])

(;W[rc];B[rb]C['A' is ko, 'B' is a failure.]LB[sd:B][sb:A]
(;W[sb];B[sd];W[qb];B[ra];W[qa];B[pb];W[sa];B[rb];W[ra];B[pa];W[sc];
B[pd];W[se])

(;W[sd];B[pd])
)
)
)

(;B[nh];W[mf])
)

(;B[qg]
C[Black must consider carefully before setting this sequence in
motion.]
;W[ph];B[of];W[ne];B[og];W[md];B[nc]
C[Black having to connect this way is painful. This is the cost
of activating Black 3 without further play by Black at top.]
;W[me])
)

(;W[ne]C['A' is easy, 'B' starts a fight.]LB[pg:B][md:A]
(;B[md];W[qh])

(;B[pg];W[md];B[nc];W[pi])
)
)

(;B[pg]
C[Black 9 emphasizes the right side, but leaves a weak point on
the triangled position.
White 'A *' is joseki, 'B' is a mistake.]
LB[og:B][qc:A]TR[qh]
(;W[qc];B[ng]
C['A *' is joseki, and 'B' is disadvantageous.
White 'C' is helping Black.
White can simply secure his corner and take sente with 'D'.]
LB[qb:D][ne:C][mg:B][nf:A]
(;W[nf]
C['A *' is joseki.
'B' aims to punish White, but is an overplay.
If you are high-dan and know a better eyplanation why B is disadvantageous
than the one presented here. mail it to me please: kogo@waterfire.us.]
LB[mg:B][lc:A]
(;B[lc];W[mg]
C[This move is helping Black, but that is ok in the overall balance
of the joseki.]
;B[nh]
C[Black must provoke being forced to this move, because it defends
against invasions on the triangled point.
'A *' is usual, 'B' the old way.]
LB[lf:B][md:A]TR[qh]
(;W[md];B[nc];W[lf]C[
* GOOD VARIATION *

'A' or 'B'.]LB[ql:B][qj:A]
(;B[qj])

(;B[ql])
)

(;W[lf]C[
'A' or 'B'.]LB[ql:B][qj:A]
(;B[qj])

(;B[ql])
)
)

(;B[mg];W[nc];B[mc];W[nb];B[mb]
C[White 'a' is correct.
White 'b' is a mistake, it takes the corner, but gives Black
huge thickness.]
LB[na:b][md:a]
(;W[md]
C[With White 18, White gets out at the top, while Black makes a
low group at top.]
;B[na];W[ne];B[ob];W[kc];B[qb];W[rb];B[ra];W[rc];B[kb];W[jb];B[lc];
W[ld];B[jc];W[kd];B[la];W[ic]
C[The result is bad for Black. But the reason is not just Black's
top group being pressed down, as White didn't get much points
with his stones between the two Black groups. Black is in a bad
position because of the triangled weakness in his wall on the
right: He will either have to repair it with a stone too close
to the wall or suffer severe invasions on the triangled point.
In comparison to the joseki, one can see that Black 13 is inefficiently
placed, Black failed to let himself being pushed onto the squared
position, which would help against invasion on the triangled
point by making impossible a kikashi on the circled point. Black
'A', 'B' or 'C' fail.
Later, White D is sente against the top group and must be answered
on E.]
LB[mg:13][oa:E][nd:D][qj:C][qk:B][pk:A]TR[qh]CR[oh]MA[nh]
(;B[pk]MA[nf][mg];W[qh]C['A' or 'B'.]LB[ph:B][rf:A]
(;B[rf];W[oh]C['A' or 'B'.]LB[og:B][ph:A]
(;B[ph];W[pi];B[qi];W[qj];B[oi];W[ri];B[pj];W[qi];B[og];W[oj];B[ni];
W[ql])

(;B[og];W[qj]C['A' or 'B'.]LB[qk:B][ph:A]
(;B[ph];W[pi];B[oi];W[oj];B[ni];W[pj];B[ok];W[qk];B[nj];W[pm])

(;B[qk];W[oj])
)
)

(;B[ph];W[qj]C['A' or 'B'.]LB[qk:B][qi:A]
(;B[qi];W[ri];B[pi];W[rg];B[rf];W[qk];B[pl];W[qm])

(;B[qk];W[pi];B[oi];W[rf]C['A' or 'B'.]LB[rg:B][qg:A]
(;B[qg];W[rg];B[rh];W[qi];B[rj];W[ri];B[pj];W[sh];B[nj])

(;B[rg];W[qg];B[pf];W[rh])
)
)
)

(;B[qk];W[qh]C['A' or 'B'.]LB[ph:B][rg:A]
(;B[rg];W[oh];B[og];W[pj])

(;B[ph];W[qj];B[pj];W[pi];B[oi];W[qi];B[pk];W[rf];B[rg];W[qg];B[pf];
W[rh])
)

(;B[qj];W[qm]
C[As Black's space on the left is small, White might first approach
from the outside to take outside territory if Black defends on
'A' or invade on 'B' if he doesn't. Black can expect no good
results from his narrow extension.]
PL[2]LB[qh:B][oj:A]
(;B[oj];W[qp])

(;W[qh]C['A' or 'B'.]LB[ph:B][rf:A]
(;B[rf];W[oh];B[og];W[pk]C[Black pressed down on the right.])

(;B[ph];W[rf]C['A' is correct, 'B' is a mistake.]LB[rg:B][qg:A]
(;B[qg];W[rg];B[rh];W[qp];W[ri]C[Later];B[qi];W[sh])

(;B[rg];W[qg];B[rh];W[qi];B[pf];W[ri];B[re];W[pi]C[Black tricked.])
)
)
)
)

(;W[na]C[White takes the corner, giving Black considerable thickness.]
;B[md];W[pb];B[mf]
C[Black's thickness may be considered superior to White's corner.])
)
)

(;W[mg]
C[Black can cut with 'A'.
'B *' reverts to joseki.
'C' and 'D' fail.]
LB[nf:D][me:C][nh:B][ne:A]
(;B[ne]C[
'A' is better than 'B'.]LB[of:B][nf:A]
(;W[nf];B[of];W[mf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[lc:b][mc:a]
(;B[mc]
C[White has to live on 'A'. Living on 'B' gives less points. Tenuki
'C' -> White dies in the corner.]
LB[dp:C][qb:B][rf:A]
(;W[rf];B[rg];W[re];B[qb];W[rb];B[pb];W[ra];B[nh])

(;W[qb];B[re];W[rd];B[rf];W[rb];B[pb];W[sc])

(;W[dp]C[Black kills on 'A' and fails on 'B'.]LB[rb:B][re:A]
(;B[re];W[rd];B[rb])

(;B[rb];W[qb];B[re];W[ra];B[sb];W[sd])
)
)

(;B[lc]C[Black 17 is a mistake.];W[ob]
C[Black continues with 'a'. Black cannot resist with 'b'.]
LB[pb:b][nb:a]
(;B[nb];W[pb])

(;B[pb]C[Black 19 is a mistake.];W[nc];B[nb];W[mc];B[md];W[mb])
)
)

(;W[of];B[nf];W[og];B[oh]C[Black's wall is superior.])
)

(;B[nh];W[nf];B[lc];W[lf]C[
* GOOD VARIATION *];B[qk])

(;B[me]C[Black 13 is a mistake.];W[nf])

(;B[nf]C[Black 13 is a mistake.];W[ne];B[me];W[nc]
C[Black continues with 'a' or 'b'.]LB[mc:b][md:a]
(;B[md];W[nb])

(;B[mc];W[md];B[ld];W[mb];B[nd];W[nb];B[lb];W[md];B[lc];W[pb])
)
)

(;W[ne];B[md];W[me];B[ld];W[le];B[kd];W[lg];B[qk])

(;W[nc];B[mc];W[nb];B[mb];W[ne];B[md];W[pb];B[ob];W[pd];B[na]PL[2];
B[rb];W[qb];B[rf];W[re];B[pa];W[ra]
(;B[sb];W[rc];B[sd];W[se];B[sc])

(;B[sc];W[rc];B[se];W[sb])
)

(;W[md];B[ne];W[nc];B[mc]
(;W[nf];B[me])

(;W[nb];B[mb];W[of];B[nf];W[og];B[oh];W[ph])
)

(;W[qb]
C[Black answers on 'A'. If he plays tenuki, Black later takes points
in sente on 'B'.]
PL[2]LB[nc:B][mc:A]
(;B[mc]PL[2])

(;W[nc];B[mc];W[nb];B[mb];W[ob];B[md])
)
)

(;W[og];B[oh];W[ng];B[qc]
C[White doesn't get much, even if he cut at 'A'.]LB[ph:A];W[ph];B[pi];
W[qh];B[qi])
)

(;B[qh]
C['A' gets White more influence than 'B'.
'B' is getting tricked.]
LB[qc:B][og:A]
(;W[og]
C['A' is usual. 'B' if Black wants to be safe on the right.
'C' denies White a base but gives him influence, while Black
is pressed down on the right side.]
LB[qc:C][qk:B][pj:A]
(;B[pj];W[qc];B[kc])

(;B[qk];W[qc];B[kc];W[pi];B[qi])

(;B[qc];W[pi];B[qi];W[pj];B[qj];W[pk];B[ql];W[om];B[qn];W[lc])
)

(;W[qc];B[ng]
C[This is better shape than the traditional joseki where Black
9 is on the circled spot.]
LB[qh:9]CR[pg];W[nf]
C[In contrast to the joseki, Black can now play 'A' instead of
'B' without developing bad shape on the right side.]
LB[lc:B][mg:A]
(;B[mg];W[nc];B[mc];W[nb];B[mb];W[md];B[na];W[ne];B[ob];W[kc];B[qb];
W[rb];B[ra];W[rc];B[lc];W[ld];B[kb];W[jb];B[jc];W[kd];B[la];W[ic];
B[pm]
C[White has no severe invasion as he would have if Black 9 were
on the triangled point. So he is tricked.]
LB[qh:9]TR[pg];W[rf];B[rg];W[pf];B[qg])

(;B[lc]C['A' is correct, 'B' is a mistake.]LB[og:B][mg:A]
(;W[mg];B[nh];W[lf]
C['A' or, dependent on the lower right corner, 'B'. 'B' still allows
an invasion.]
LB[pn:B][pl:A]
(;B[pl];W[rf];B[rg];W[pf];B[qg])

(;B[pn]
C['A' doesn't damaged much, 'B' makes a small life for huge influence.]
LB[qj:B][pf:A]
(;W[pf];B[rf];W[ph];B[pi];W[oh];B[oi];W[of];B[ni])

(;W[qj];B[ql];W[oj];B[rj];W[ri];B[qi];W[rk];B[pj];W[qk];B[pk];W[sj];
B[rl];W[rh];B[rg];W[sh];B[sl];W[sk];B[oi])
)
)

(;W[og];B[oh]
C[After 'A' Black has been strengthened, after 'B', White has been
tricked.]
LB[nh:B][mg:A]
(;W[mg];B[nh];W[lf];B[pm])

(;W[nh];B[mg];W[ph];B[oi];W[pg];B[pi];W[mf];B[lg];W[qg];B[lf];W[qi];
B[qj];W[rh];B[pk])
)
)
)
)

(;B[pf];W[qc]C[White is safe and can attack on 'A' or 'B'.]
LB[pi:B][ld:A])
)

(;W[pf]C['A', 'B' or 'C'.]LB[pg:C][qg:B][pd:A]
(;B[pd];W[qe];B[pe];W[qg];B[rf];W[rg];B[of];W[pg];B[qc];W[re];B[rd];
W[sf])

(;B[qg];W[pc];B[oe];W[pd])

(;B[pg];W[of];B[pc];W[qc];B[pd];W[qe];B[qg];W[pe];B[kc])
)
)

(;W[qe]
C[Joseki continues with Black 'a *'. Black 'b' has been played
professionally, but is not recommended.]
LB[pf:b][pg:a]
(;B[pg]C[White continues with 'a *' or 'b'.]LB[oe:b][od:a]
(;W[od];B[nd]C[White continues with 'a *' or 'b'.]LB[ne:b][oe:a]
(;W[oe];B[pb];W[qb];B[qc];W[rc];B[pc];W[rb]
C['A '' is correct, 'B' is premature.]LB[ng:B][re:A]
(;B[re];W[rd];B[ng];W[nf];B[lc];W[mg];B[nh];W[lf]
C[
* GOOD VARIATION *])

(;B[ng];W[nf];B[lc];W[mg];B[nh];W[re])
)

(;W[ne]C['A' or 'B'.]LB[oe:B][md:A]
(;B[md];W[of];B[pc];W[me];B[ld];W[og])

(;B[oe];W[of];B[pd];W[pe];B[od];W[pf];B[qc];W[me];B[lc];W[rc])
)
)

(;W[oe]C[Black continues with 'a' or 'b'.]LB[md:b][lc:a]
(;B[lc];W[pc];B[ob];W[pb])

(;B[md];W[nf]
C[Black will probably extend down the right next, so White gets
a base with 'a'.]
LB[pc:a])
)
)

(;B[pf]
C[Black 5 was played by Handa Dogen against Kitani Minoru in round
2 of the 18th (1963) Honinbo League.]
;W[od];B[pc];W[qc];B[qj];W[nd];B[mc];W[nc];B[nb];W[ob]
C[The two Black stones are captured. In the game, Black played
elsewhere.])
)

(;W[pc]C['A' or 'B'.]LB[od:B][pe:A]
(;B[pe];W[ob];B[nc];W[nb];B[mc])

(;B[od]C['A' is correct, 'B' eliminates the marked cut.]LB[rf:B][ob:A]
TR[pe]
(;W[ob];B[nb];W[pb];B[mc])

(;W[rf];B[rg];W[re];B[pg])
)
)
)

(;B[qg]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

White may respond at 'a *' or 'b *'. He must not permit Black
'a' by playing elsewhere.
]
LB[od:b][pe:a]
(;W[pe]
C[Black continues with 'a *' or 'b *', continuing to emphasize
the right side. Black 'c' is playable, but shifts Black focus
to the top.]
LB[md:c][og:b][qj:a]
(;B[qj]
C[White continues with 'a *', 'b', 'c *' or 'd'. White 'e' is not
recommended.]
LB[nd:e][kc:d][lc:c][of:b][pc:a]
(;W[pc];B[od];W[pb];B[kc]C[
* GOOD VARIATION *])

(;W[of];B[lc];W[pc])

(;W[lc]
C[Black continues with 'a *'. Sliding into the corner with Black
'b' is premature.]
LB[qb:b][nd:a]
(;B[nd];W[of];B[me];W[pc];B[kd];W[jc]C[
* GOOD VARIATION *])

(;B[qb]C[The slide of Black 7 is premature.];W[nd];B[nc];W[md];B[rc];
W[og])
)

(;W[kc];B[qb];W[nd];B[nc];W[md];B[rc];W[og])

(;W[nd]
C[White 6 is not recommended. There is no point giving away territory
in this way.

Black continues with 'a'. Black 'b' is not recommended.]
LB[mc:b][nc:a]
(;B[nc];W[ld];B[mc];W[ne];B[kc];W[pc]
C[Grabbing the corner is small compensation.])

(;B[mc]C[Black 7 is not recommended.];W[nc];B[nb];W[od]
C[Black 'a' (a sacrifice play) and 'b' are possible continuations.]
LB[ob:b][pc:a]
(;B[pc];W[ob];B[mb];W[pb])

(;B[ob];W[le])
)
)
)

(;B[og]
C[White continues with 'a *' or 'b'. White 'c' is not recommended.]
LB[ne:c][pc:b][nd:a]
(;W[nd];B[nc];W[pc];B[od];W[oe];B[kc]C[
* GOOD VARIATION *])

(;W[pc];B[ne]
C[White leaves until later how to attack Black's thinness.])

(;W[ne]C[White 6 is not recommended.];B[md]
C[Black 7 is a very effective move.

White 'a' and 'b' are both unpleasant to White.]
LB[pc:b][me:a]
(;W[me]
C[White 8, prompting Black to crawl along the fourth line, is painful.]
;B[ld];W[pc];B[od];W[oe];B[mg]C[Black forces another push by White.];
W[le];B[kd])

(;W[pc];B[od];W[oe];B[me];W[ng];B[mf];W[nf];B[oh]
C[White has poor shape.])
)
)

(;B[md]
C[Black 5 is a bit inconsistent. In this case, Black 3 would be
better placed one space higher (4th line).]
;W[pc];B[od]C[White continues with 'a' or 'b'.]LB[of:b][pb:a]
(;W[pb];B[ic])

(;W[of]C[White can continue on A or B.]LB[kc:B][ph:A])
)
)

(;W[od]
C[The idea of White 4 is to settle shape quickly. Professionals
shy away from such play, because while fortifying oneself, they
also strengthen the opponent, foreclosing later options.]
;B[nd];W[oe];B[pc];W[qc]
C[Black continues with 'a *' or 'b'. Black 'c' is a mistake.]
LB[qb:c][qj:b][kc:a]
(;B[kc]
C[White continues with 'a *'. White cannot afford to play elsewhere
('b'). If self-preservation of the White corner stones is not
top priority, White 'c' may be feasible.]
LB[pj:c][dp:b][qf:a]
(;W[qf]C[White 10 is necessary.];B[rf];W[re];B[pf];W[qe]
C[
* GOOD VARIATION *])

(;W[tt]
C[White plays elsewhere, a mistake. Black continues with 'a', or
the more sneaky 'b'.]
LB[qb:b][rf:a]
(;B[rf];W[qe];B[og];W[nf];B[md])

(;B[qb]C[White continues with 'a'. White 'b' is a mistake.]
LB[rb:b][qf:a]
(;W[qf]C[Black continues with 'a' or 'b'.]LB[rb:b][rf:a]
(;B[rf];W[re];B[pf];W[qe]C['a' and 'b' are miai. White lives.]
LB[rg:b][rb:a])

(;B[rb];W[og])
)

(;W[rb]C[White has been tricked.];B[pd];W[pe];B[qe]
C[White continues with 'a' or 'b'.]LB[qf:b][pb:a]
(;W[pb];B[nc]
C[White still has to settle himself into a small corner. White
prospects are dim.])

(;W[qf];B[re])
)
)
)

(;W[pj];B[og];W[ph];B[pg];W[nf]C[Black may try 'a' or 'b'.]
LB[qb:b][ng:a]
(;B[ng];W[nc]C[The ensuing fight may take several directions.])

(;B[qb];W[rb];B[pd];W[pe];B[qe];W[re];B[qf];W[nc];B[nb];W[mc];B[mb];
W[lc];B[lb];W[me]
C[White lives in the corner, and Black must find eye-shape for
the Black stones on the right.])
)
)

(;B[qj];W[kc];B[ne]C[White continues with 'a'. White 'b' is wrong.]
LB[og:b][pg:a]
(;W[pg]C[Black continues with 'a'. Black 'b' is not as good.]
LB[ph:b][qh:a]
(;B[qh];W[og];B[le];W[id])

(;B[ph]
C[Black 13 is not recommended: the move is not bad, but the other
variation is slightly better.]
;W[og]C[Since White is going to play 14 anyway, Black shouldn't help.]
;B[qf];W[qe];B[le];W[id])
)

(;W[og]C[White 12 is a mistake.];B[le];W[id];B[lb]
C[Black 15 defends against the marked cutting point.

White continues with 'a'. White cannot afford to defend at top
with 'b'.]
LB[kb:b][rf:a]CR[nc]
(;W[rf];B[qf];W[qe];B[rg]
C[Black 17 and 19 strengthen Black for which White has no compensation.])

(;W[kb]C[White 16 is a mistake.];B[pd];W[pe];B[qe];W[qf];B[pf]
C['a' and 'b' are miai, a terrible result for White.]LB[re:b][of:a])
)
)

(;B[qb]C[Black 9 is a mistake.];W[rb];B[pd];W[pe];B[qe]
C[White continues with 'a'. White 'b' is a mistake.]LB[pb:b][nc:a]
(;W[nc];B[nb];W[mc];B[mb];W[qf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[re:b][lc:a]
(;B[lc];W[re];B[md]
C[White has played elsewhere once, Black 3 is now useless: the
result favors White.])

(;B[re]C[Black 19 only makes Black's situation worse.];W[pb];B[ob];
W[qa];B[lc];W[rf];B[ne];W[pg];B[nf];W[ph])
)

(;W[pb];B[ob];W[qa];B[mc])
)
)
)

(;B[qh]
C[
Sangen Basami = Sekan Hyeopgong = San Jia = 3-Space Low Pincer
---------------------------------------------------------------

Black 1 is mainly influenced by the position in the bottom right
corner. It indicates a special strategy and is not seen often.
In the local context it is a slack move.

White continues with 'a *' or 'b *'.
'c' is bad. tenuki 'd' is possible.
]
LB[dp:d][od:c][pe:b][pc:a]
(;W[pc];B[od]C[White continues with 'a *'. White 'b' is a mistake.]
LB[pe:b][qf:a]
(;W[qf];B[og]C[
* GOOD VARIATION *])

(;W[pe]C[White 6 is a mistake.];B[qf]
C[White continues with 'a'. White 'b' is a mistake.]LB[pb:b][qe:a]
(;W[qe];B[kc])

(;W[pb];B[ld];W[tt]C[White plays elsewhere.];B[rd]
C[White continues with 'a'. White 'b' is a mistake.]LB[rc:b][re:a]
(;W[re];B[qe];W[rc];B[pd];W[sd])

(;W[rc]
C[White 11 is a mistake. White cannot make two eyes in the corner.];
B[re];W[ob];B[nb];W[ra];B[sb];W[sc];B[oa];W[pa];B[pd];W[qe];B[qb]
AB[pg][nf]
C[If White is sealed in the corner, such as with the extra Black
stones as shown, White dies when Black plays 22.]
;W[rb];B[qc];W[qa];B[qc])
)
)
)

(;W[pe]C['A *' is correct, 'B' is wrong.]LB[kc:B][lc:A]
(;B[lc];W[pc];B[od]C[
* GOOD VARIATION *]PL[2];B[qf]
C[Later, Black can continue here.
'A' or 'B'.]LB[pb:B][qe:A]
(;W[qe])

(;W[pb];B[rd]C['A' is correct, 'B' is wrong.]LB[re:B][rc:A]
(;W[rc];B[re])

(;W[re];B[qe];W[rc];B[pd];W[sd])
)
)

(;B[kc];W[pg];B[ph];W[mc])
)

(;W[od];B[nd];W[oe];B[pc];W[qc]C['A' or 'B'.]LB[ne:B][kc:A]
(;B[kc])

(;B[ne];W[nf];B[of]
C[This answer is enabled by the triangled Black stone.

If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.]
TR[qh])
)

(;W[dp];B[pe];W[qe];B[pf];W[qf];B[pg];W[pb];B[pc];W[qc];B[ob])
)

(;B[pg]
C[
Nikken Takabasami = Dukan Nop'dahyeopgong = E`r Gaojia = 2-Space High Pincer
-----------------------------------------------------------------------------

The aim of Black 3 is to take advantage of White's response to
play at the top.

White 'a *' is more common. White 'b *' is the same as the one-space
pincer variations.
]
LB[od:b][pe:a]
(;W[pe]C[Black continues with 'a *' or 'b'.]LB[oe:b][md:a]
(;B[md];W[pc];B[od]
C[White continues with 'a *'. A checking extension such as 'b'
is not possible.]
LB[jd:b][pb:a]
(;W[pb];B[ic]C[
* GOOD VARIATION *])

(;W[jd]C[White 8 is a mistake.];B[pd];W[qc];B[qe]C['A' or 'B'.]
LB[re:B][qf:A]
(;W[qf];B[re];W[pf];B[rf];W[qg];B[rg];W[qh];B[rd])

(;W[re];B[qf])
)
)

(;B[oe];W[of];B[pf];W[od];B[ne];W[nd];B[me]
C[White continues with 'a'. White 'b' is an overplay.]LB[md:b][nc:a]
(;W[nc];B[lc];W[lb]
C[White 14 helps strengthen Black, but secures White's position
in sente.]
;B[kb];W[mb];B[kd])

(;W[md]
C[White 12 is an overplay; White cannot make territory so easily.];
B[le];W[ld];B[ke];W[jc];B[qc];W[rc];B[rb]
C[The two-step hane is the tesuji.];W[pc];B[qb]
C[White 'b' looks obviously right, but is wrong. White must play
'a' and concede the corner.]
LB[rd:b][pb:a]
(;W[pb];B[rd];W[re];B[sc])

(;W[rd]C[White 22 is a mistake.];B[pb];W[pd];B[nb]
(;W[mb];B[sb])

(;W[sb]C[White 26 is a mistake.];B[mb];W[lb];B[lc]
C[White must play 'a'; 'b' and 'c' are unreasonable.]
LB[mc:c][kc:b][kd:a]
(;W[kd];B[kb])

(;W[kc]C[White 30 is a mistake.];B[mc];W[kd];B[kb])

(;W[mc]C[White 30 is a mistake.];B[kc];W[kd];B[kb])
)
)
)
)
)

(;W[od]C[Black continues with 'a *'. Black 'b' is a mistake.]
LB[pd:b][nd:a]
(;B[nd]C['A *' is joseki, 'B' is questionable.]LB[oe:A][pf:B]
(;W[oe];B[pc];W[qc];B[qf];W[qe]
C[
* GOOD VARIATION *

See the variation referenced by the numbers for the continuations.]
LB[qc:10][pg:9][qe:8][pc:7][oe:6][nd:5][od:4][qf:3][qd:2][oc:1])

(;W[pf]
C[If you are high-dan and know the follow-up. mail it to me please: 
kogo@waterfire.us.
'A' reverts to an equal result.]
LB[qf:A];B[qf]
C[See the variation referenced by the numbers for continuation.]
LB[pg:7][pf:6][nd:5][od:4][qf:3][qd:2][oc:1])
)

(;B[pd]C[Regardless of the ladder, Black 5 is a mistake.];W[pe];B[pc];
W[re];B[oe];W[of];B[nd];W[pf]
C[Black 3 has lost all power, which is not compensated for by Black's
ponnuki.])
)
)

(;B[pf]
C[
Taisha = Daesa = Da`xie´ = Large Slant = Grosse Schiefe Ebene
--------------------------------------------------------------

Black 3 initiates the taisha (large slant) joseki, regarded as
one of the most complex joseki, and noted for its multitude of
variations. For the complex variations (variation 'd *'), Black
must have the ladder.

White may play at 'a *', 'b *' or 'c *', or play elsewhere 'e
*', to avoid complications. These are compromise moves, so slight
disadvantages cannot be avoided. There are compromise moves even
after attaching at 'd'.
]
LB[dp:e][od:d][pe:c][qf:b][qe:a]
(;W[qe]
C[Black continues with 'a *' or 'b'. Black 'c' is not recommended.]
LB[qf:c][qc:b][oe:a]
(;B[oe];W[qg];B[jc]
C[
* GOOD VARIATION *

Later, White plays 'A' or 'B' or Black 'C'.]
PL[2]LB[ph:C][pg:B][qh:A]
(;W[qh])

(;W[pg];B[og];W[oh];B[ng];W[nh];B[mg])

(;B[ph]C['A' is correct, 'B' is a mistake.]LB[qh:B][rh:A]
(;W[rh];B[pg];W[qj])

(;W[qh];B[pi];W[qi];B[pj])
)
)

(;B[qc];W[rc];B[pc]
C['A' is correct, 'B' and 'C' are unfavorable attempts to cut Black.]
LB[rb:C][qf:B][qg:A]
(;W[qg];B[rb];W[pg])

(;W[qf];B[ph];W[od];B[nd];W[oe];B[rb])

(;W[rb];B[qf];W[rf];B[rg];W[od];B[nd];W[oe];B[re];W[rd];B[sf])
)

(;B[qf]C[Black 5 is an overplay.];W[od];B[nd];W[oe];B[pc];W[qc]
C[Black 3 should be at P13, not P14.])
)

(;W[qf]C[Black continues with 'a *' or 'b *'.
'c' is a mistake.]
LB[pg:c][qg:b][pe:a]
(;B[pe]C[White continues with 'a *'. White 'b' is not recommended.]
LB[qg:b][qe:a]
(;W[qe];B[pg];W[qh];B[jc]C[
* GOOD VARIATION *])

(;W[qg]
C[White 6 gives Black a favorable result.
'A' makes a secure base in the corner in sente, 'B' aims for
influence over the top side, giving the corner in gote.]
LB[qe:B][qc:A]
(;B[qc];W[qe];B[pc];W[qj])

(;B[qe];W[re]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qc:b][pd:a]
(;B[pd]C[White continues with 'a'. White 'b' is a mistake.]
LB[qc:b][rd:a]
(;W[rd];B[jc])

(;W[qc]C[White 10 is a mistake.];B[rf];W[rd];B[qh]
C[White must suffer and play 'a'. White 'b' is a mistake.]
LB[pg:b][rg:a]
(;W[rg];B[pg])

(;W[pg]C[White 14 offers White a fight with little propsect of gain.];
B[rg];W[ph];B[qi])
)
)

(;B[qc];W[pd];B[od];W[rd])
)
)
)

(;B[qg]
C[White continues with 'a *' or 'b'. White 'b' leads to complications.]
LB[pg:b][pe:a]
(;W[pe]C[White 6 is a simple variation.];B[rf];W[qe];B[pg];W[nd]
C[Black continues with 'a *' or 'b'.]LB[qk:b][mc:a]
(;B[mc];W[pc];B[qk]C[
* GOOD VARIATION *])

(;B[qk]
C[Black 11 is recommended if White is likely to pincer on the right.];
W[nc]C[There is still aji in Black 1.])
)

(;W[pg]C[White 6 introduces complications. The ladder is important.];
B[qe];W[rf]C[Black continues with 'a' or 'b'.]LB[pe:b][of:a]
(;B[of]C[White continues with 'a'. White 'b' is a mistake.]
LB[qh:b][re:a]
(;W[re];B[ph];W[pc];B[nd])

(;W[qh]C[White 10 is a mistake.];B[re];W[rg];B[pd]
C[Black's corner profit is substantial.])
)

(;B[pe]C[Black 9 is sensible with an unfavorable ladder.];W[re];B[qh];
W[og];B[ne];W[qc];B[pj])
)
)

(;B[pg];W[od];B[pc];W[pd];B[qc];W[nc])
)

(;W[pe]C[White continues with 'a *', or possibly the unorthodox 'b'.]
LB[of:b][oe:a]
(;B[oe]C[White continues with 'a *' or 'b *'.]LB[od:b][qf:a]
(;W[qf]
C['a *', 'b *' and 'c *' is joseki. 'a *' is the most difficult,
'c *' the easiest of the three.]
LB[of:c][pd:b][pg:a]
(;B[pg];W[qg];B[ph]
C[White continues with 'a *'. White 'b' is premature.]LB[qi:b][qh:a]
(;W[qh];B[pi];W[qj]C[Black can play at 'a *' or first force at 'b'.]
LB[qc:b][ic:a]
(;B[ic]
C[
* GOOD VARIATION *

White 'a' makes Black thick, but playing elsewhere ('b') is also
costly.]
LB[dp:b][od:a]
(;W[od]
C[White 14 is after the joseki. The corner is at stake, but playing
this early makes Black thick.]
;B[nd];W[pd]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[nc:b][ne:a]
(;B[ne];W[nc]C['A' or 'B'.]LB[mc:B][ob:A]
(;B[ob];W[nb];B[qb];W[qc])

(;B[mc];W[nb];B[mb];W[ob])
)

(;B[nc]C[Black 17 is a mistake.];W[ne];B[of];W[me];B[lc]
C[Black is low.];W[mg]
C[Black's center stones will have to make life in the center, giving
White opportunity for profit as well as ruining Black's thickness.])
)

(;W[tt]C[White plays elsewhere.];B[pd];W[qe];B[qc];W[rc];B[qb])
)

(;B[qc]
C[White will normally answer at 'a' or 'c'. In a 1985 Meijin game
against Kobayashi, Cho with Black didn't answer, and 'b' shows
what happened.]
LB[jc:c][dp:b][rc:a]
(;W[rc];B[ic]
C[The exchange of the marked stones aims at dissuading White of
wedging at 'a'. The continuation shows why.]
LB[od:a];W[od];B[nd];W[pd];B[pc];W[rb];B[mc];W[ne];B[of];W[me];B[kd]
C[All of Black's stones are working together efficiently.])

(;W[tt];B[pd];W[qe];B[qi];W[ri];B[pj];W[qk];B[rj];W[rk];B[rd];W[re];
B[rc];W[rh])

(;W[jc];B[pd];W[qe];B[rd];W[qi];B[hc])
)
)

(;W[qi]C[White 10 is a mistake.];B[pd];W[qe];B[qc];W[rc];B[rb];W[qb];
B[pc]C[White continues with 'a'. White 'b' is unreasonble.]
LB[sb:b][rd:a]
(;W[rd]
C[White must defend with 18 because of the potential thrust at
'a'.]
LB[qh:a];B[ic])

(;W[sb]C[White 18 is a mistake.];B[qh];W[rh];B[ri]
C[White must play 'a'. White 'b' is a mistake.]LB[rj:b][rg:a]
(;W[rg]C[White 22 is necessary.];B[qj]
C[Black cuts off the White stone.])

(;W[rj]C[White 22 is a mistake.];B[rg];W[si];B[rd];W[rf];B[sc])
)
)
)

(;B[pd];W[qe];B[qc];W[rc];B[qb];W[pg];B[of];W[qj]
C[
* GOOD VARIATION *])

(;B[of];W[qg]C[
* GOOD VARIATION *])
)

(;W[od]C[The hanekomi of White 6 was invented by Kitani Minoru.];B[nd]
;W[pd]C[Black continues with 'a *' to 'c *'.]LB[nc:c][of:b][ne:a]
(;B[ne]C[White continues with 'a *'. White 'b' is not recommended.]
LB[qf:b][nc:a]
(;W[nc]C[Black continues with 'a *' or 'b *'.]LB[ob:b][mc:a]
(;B[mc];W[nb]C[Black continues with 'a', 'b *' or 'c'.]
LB[qf:c][ld:b][mb:a]
(;B[mb];W[ob];B[og])

(;B[ld];W[ob];B[qf]C[
* GOOD VARIATION *])

(;B[qf];W[mb];B[lc];W[lb];B[kc];W[tt]C[White plays elsewhere.];B[qb];
W[pb]C[White 19...];B[rd]C[... allows Black 20.])
)

(;B[ob]
C[Black 11 is a relatively recent innovation. White continues with
'a *'. White 'b' is a mistake.]
LB[mc:b][nb:a]
(;W[nb]
C[The joseki continues at 'a *', but it is important to know how
to answer Black 'b'.]
LB[qb:b][lc:a]
(;B[lc]C[White continues with 'a *'. White 'b' is pointless.]
LB[lb:b][pb:a]
(;W[pb];B[mc];W[pc]
(;B[og]C[
* GOOD VARIATION *])

(;B[tt]C[Black plays elsewhere.];W[pg]
C[Black fights back with 'a', or plays solidly with 'b'.]
LB[og:b][qf:a]
(;B[qf]C[Black 19 provokes a fight.];W[of];B[qg];W[og];B[qi];W[oi]
C[Black continues with 'a' or 'b'.]LB[pk:b][le:a]
(;B[le]C[Black 24 is honte (the correct defense).];W[qj];B[rj];W[pi];
B[rh];W[qk];B[rk];W[ql])

(;B[pk];W[mf];B[le])
)

(;B[og];W[qf];B[oh])
)
)

(;W[lb]C[White 14 is fruitless.];B[mc];W[mb];B[kc];W[pb])
)

(;B[qb];W[qc]
C[Black continues with 'a'. White cannot live in the corner with
'b'.]
LB[pb:b][lc:a]
(;B[lc]C[White continues with 'a'. White 'b' is a mistake.]
LB[lb:b][pb:a]
(;W[pb];B[mc];W[oa];B[og])

(;W[lb]C[White 16 is a mistake.];B[oa]
C[Black 17 is the tesuji.

White continues with 'a'. White 'b' is a mistake.]
LB[rb:b][kc:a]
(;W[kc];B[ld];W[mc];B[rb]C[White faces a tough fight.])

(;W[rb]C[White 18 is a mistake.];B[mb];W[mc];B[md];W[ma];B[na];W[mb];
B[kb])
)
)

(;B[pb]C[Black cannot live in the corner.];W[lc];B[rc];W[rd];B[sc];
W[qf]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[pg:b][qg:a]
(;B[qg];W[pg];B[of];W[rg];B[qh];W[re])

(;B[pg]C[Black 23 is a mistake.];W[qg];B[qh];W[rh];B[ri];W[ph];B[qi];
W[of];B[og];W[nf])
)
)
)

(;W[mc]C[White 12 is a mistake.];B[rc]
C[Black 13 is the tesuji. White continues with 'a' or 'b'.]
LB[qc:b][qf:a]
(;W[qf];B[pg];W[qg];B[ph];W[qh];B[pi];W[qc];B[qb];W[rb];B[sb];W[pb];
B[ra];W[pa];B[rd];W[qe];B[ld])

(;W[qc];B[qb];W[rb];B[sb];W[pb];B[ra];W[pa];B[rd];W[nb];B[qf])
)
)
)

(;W[qf]
C[White 10 is not recommended, as it gives Black superior thickness.];
B[pg];W[qg];B[ph];W[nc];B[mc];W[nb];B[mb];W[ob];B[qh])
)

(;B[of];W[nc];B[mc];W[nb];B[md];W[ob])

(;B[nc]C[Whit continues with 'a *'. White 'b' is not recommended.]
LB[qf:b][of:a]
(;W[of];B[ne];W[pg];B[qf];W[qg];B[rf];W[rg];B[rc]
C[White continues with 'a *'. White 'b' is less favorable.]
LB[re:b][rd:a]
(;W[rd];B[qc]
C[
* GOOD VARIATION *

Black can aim at the cutting point at 'a'. The atari at 'b' and
connection of 'a' is less promising.]
LB[nf:b][og:a];W[tt]C[White plays elsewhere.];B[og];W[nf];B[mf];W[ng];
B[oh];W[mg];B[lf]
C[Black 26 is the move Black wants to be forced into making: crawling
on the sixth line.])

(;W[re]C[White 18 is not recommended.];B[nf];W[og];B[rd];W[sf])
)

(;W[qf]C[White 10 is too mild.];B[of];W[qh];B[ic])
)
)
)

(;B[of]
C[Black 5 was invented by Hashimoto Utaro in 1964 (played in the
19th Honinbo League agasint Kitani Minoru).

White continues with 'a' or 'b'.]
LB[oe:b][nd:a]
(;W[nd];B[nc];W[md];B[mc];W[od];B[pc];W[qf];B[qg];W[lc];B[lb];W[kc];
B[kb];W[jc];B[jb];W[ic];B[ph])

(;W[oe];B[nf];W[qf];B[qg];W[ne];B[rf];W[qe];B[lc];W[mf];B[ph];W[jc])
)
)

(;W[od]
C['A *' is joseki, If Black regrets what he has done so far and
fears the consequence of the many variations of the taisha after
'A', he compromises on 'B'.]
LB[nd:B][pd:A]
(;B[pd]LB[pe:A][pc:B]C['A' is correct, 'B' is a mistake.
]
(;W[pe];B[pc]
C[White continues with 'a' or 'b *'.
White 'a' has only one joseki continuation, but requires a favorable
ladder.
White 'b' gives White the choice between some easy and the '1000
variations'.]
LB[qe:b][oe:a]
(;W[oe]C[White 8 requires a favorable ladder.];B[qe];W[qf];B[re]
C['A' is joseki, 'B' is inferior.]LB[qg:B][pg:A]
(;W[pg]
C[Black 'a' is joseki. Black 'b' leads to a slightly unfavorable
position for Black. Black should not play elsewhere ('c').]
LB[dp:c][rf:b][mc:a]
(;B[mc];W[of];B[rd])

(;B[rf]C[Black 13 is not recommended.];W[of]
C[Black 'a' is best. Black 'b' is riskier.]LB[qh:b][rg:a]
(;B[rg];W[nc];B[nb];W[mc];B[mb];W[lc]
C[White's thickness is better: Black has territory, but his position
is too low.])

(;B[qh];W[nc];B[nb];W[mb];B[mc];W[nd]
C[Black continues with 'a'. Black 'b' involves a dangerous ko for
Black.]
LB[lb:b][ob:a]
(;B[ob];W[lc]C[White 'a' remains as bad aji in Black's position.]
LB[rg:a])

(;B[lb];W[rd]
C[Black continues with 'a'. Black 'b' only makes the ko worse for
Black.]
LB[ma:b][ob:a]
(;B[ob];W[rg];B[qg];W[se];B[pf];W[md]
C[Black connects the ko at 'a'. If]LB[lc:b][qf:a];B[qf];W[lc];B[rc]
C[Black has no choice but to connect the ko at 29. If he defends
against 28, White will take the ko and ignore any ko threat.

White has sente, making this a good result for him.])

(;B[ma]C[Black 23 is a mistake.];W[rg];B[qg];W[se];B[pf];W[pb]
C[Black will probably lose one of the marked groups.]
TR[rf][re][qe][pd][pc][oc])
)
)
)

(;B[tt]C[Black plays elsewhere; not recommended.];W[of];B[rd];W[nc];
B[nb];W[mb];B[mc];W[nd];B[ob];W[lc])
)

(;W[qg];B[rd];W[og];B[md])
)

(;W[qe];B[oe]
C[White continues with 'a *' or 'b *'.
White 'b' leads to the difficult and manyfold variations of the
taisha. Learn these after you learned any other joseki you find
here.]
LB[nd:b][of:a]
(;W[of]C[Black continues with 'a *' or 'b *'.]LB[ne:b][nd:a]
(;B[nd]
C[White fights ko with 'a *'. White 'b' to avoid ko is unthinkable.]
LB[pg:b][ne:a]
(;W[ne]
C[Black continues with 'a *' or 'b'. Black 'c' is bold, as it requires
Black having large ko threats. Black 'd' is a mistake.]
LB[od:d][nf:c][md:b][me:a]
(;B[me];W[od];B[qc];W[oe];B[md]
C[White continues locally with 'A' or 'B *'. White may play elsewhere,
but this is not recommended.]
LB[dp:C][qi:B][qj:A]
(;W[qj])

(;W[qi]
C[
* GOOD VARIATION *

From the standpoint of tewari, this result is slightly favorable
to Black.
Continuations Black 'A' or White 'B'.]
PL[2]LB[mf:B][mg:A]
(;B[mg]C[Later, this is gote.]PL[2];B[og];W[qg])

(;W[mf];B[lf];W[mh];B[mg];W[ng];B[lg];W[lh];B[kh];W[ki])
)

(;W[tt]C[White plays elsewhere, not recommended.];B[ph];W[oh];B[oi];
W[nh];B[pj]C[White's position has eroded considerably.])
)

(;B[md];W[od];B[qc];W[pg])

(;B[nf]C[Black must have some very large ko threats to play this way.]
;W[od])

(;B[od]C[Black 13 is a mistake.];W[qc];B[nf];W[og];B[me];W[pg]
C[Despite the ponnuki, the result favors White.])
)

(;W[pg]C[White 12 is cowardice.];B[nf];W[og];B[ng];W[oi];B[nh];W[pi])
)

(;B[ne];W[pg];B[nf];W[og]
C[
* GOOD VARIATION *

A is now a big continuation for both sides.]
LB[ng:A])
)

(;W[nd]
C[White 10 leads to the difficult variations. 

Black must have the ladders.
'A' is correct.
'B' is a mistake.]
LB[qf:B][qc:A]
(;B[qc]
C[Black 11 is the only move.

White 'a *' is the only continuation. White 'b' is close to being
a trick play, although it is a hard one to deal with. White needs
the ladder for 'b'.]
LB[nc:b][qf:a]
(;W[qf]
C[White 12 is the only continuation.

Black continues with 'a *', 'b *' or 'c *'.

Black 'd' is a trick play.]
LB[ld:d][ne:c][pg:b][of:a]
(;B[of]
C[Joseki continues with White 'a *'. White 'b' is a trick play
that requires careful answering.]
LB[nc:b][qh:a]
(;W[qh]
C[Black has six possible continuations: 'a *' through 'e *'. 'f'.

f6, e5, d4, c3, b2, a1]
LB[le:f][me:e][md:d][ld:c][mc:b][mb:a]
(;B[mb]
C[White continues with 'a *'. White 'b' may be playable if caring
for the two White center stones is a burden.]
LB[pg:b][ld:a]
(;W[ld]C[Black continues with 'a *' to 'c *'.]LB[nh:c][mh:b][oh:a]
(;B[oh]C[White continue with 'a *' to 'c'.]LB[lg:c][jd:b][pj:a]
(;W[pj];B[lg]C[Black 19 at 'a' is also possible.]LB[kg:a];W[jd]
C[
* GOOD VARIATION *])

(;W[jd];B[qi];W[ri];B[ph];W[rg];B[qj];W[rj];B[qk])

(;W[lg];B[qi];W[ri];B[ph];W[rg];B[qj])
)

(;B[mh]C['A' is correct, 'B' is a mistake.]LB[ng:B][pg:A]
(;W[pg];B[mf];W[jd];B[pi];W[rj];B[og])

(;W[ng];B[ph];W[nh];B[qi];W[qg];B[oh];W[ri];B[ni];W[qj];B[mg])
)

(;B[nh]C[White continues with 'a *'. White 'b' is not recommended.]
LB[jd:b][pj:a]
(;W[pj]C['A *' or 'B'.]LB[kg:B][lg:A]
(;B[lg];W[jd]C[
* GOOD VARIATION *])

(;B[kg];W[jd])
)

(;W[jd]C[White 18 is not recommended.];B[pj];W[rj];B[ph];W[qi];B[nk])
)
)

(;W[pg]
C[White 16 is not recommended, but perhaps reasonable if caring
for the two White center stones is a burden.]
;B[me]
C[Black later playing at 'a' to seal the White stones is a good
idea.

White cannot pull the two stones out, as the continuations show.]
LB[md:a];W[md];B[le];W[ld];B[kd]
C[White may try 'a' or 'b'. Neither work.]LB[ne:b][lb:a]
(;W[lb];B[lc];W[mc];B[kc];W[nb];B[ma]
C[White may try 'a' or 'b'. Neither work.]LB[na:b][nc:a]
(;W[nc];B[ob];W[na];B[kb])

(;W[na];B[nc];W[la];B[mb];W[ma];B[ne];W[mb];B[ob])
)

(;W[ne];B[nf];W[mf];B[ng];W[mg];B[nh];W[mh];B[mi];W[li];B[ke];W[ni];
B[oi];W[mj];B[oh];W[oj];B[pi])
)
)

(;B[mc];W[md]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[lc:b][ld:a]
(;B[ld]C[White continues with 'a'. White 'b' is a mistake.]
LB[le:b][nc:a]
(;W[nc];B[nb];W[mb];B[lc];W[ob]
C[Black must sacrifice another stone by playing 'a'. Black 'b'
results in a ko unfavorable to Black.]
LB[me:b][na:a]
(;B[na]C[White must play 'a'. White 'b' is a mistake.]LB[ma:b][me:a]
(;W[me]
C[Black continues with 'a' or 'b'. If White plays properly, he
may secure a favorable result.]
LB[pb:b][lb:a]
(;B[lb];W[rc];B[pb]C['A' or 'B',]LB[mg:B][qb:A]
(;W[qb];B[pa];W[le])

(;W[mg];B[oh];W[mi];B[oj];W[rb]
C[White 32 is big. This result favors White.])
)

(;B[pb];W[le];B[ke];W[kf];B[je];W[lg]
C[Black gets a good position at the top, but his three center stones
are forfeit: Black 'a' prompts White 'b'.]
LB[pj:b][oh:a])
)

(;W[ma];B[me];W[oa];B[nb];W[na];B[ne];W[nb]C['A' or 'B'.]
LB[rb:B][lb:A]
(;B[lb];W[rc];B[qb]
C[White plays 'a' and is captured outright. White plays 'b' and
gets an unfavorable ko.]
LB[qa:b][rb:a]
(;W[rb]C[Black can play 'a' or 'b' to capture.]LB[ra:b][pa:a])

(;W[qa];B[rb];W[sb];B[rd];W[ra];B[sc];W[pb];B[sa])
)

(;B[rb])
)
)

(;B[me];W[na];B[ne];W[nb]C['A' is correct, 'B' is a mistake.]
LB[rc:B][pb:A]
(;B[pb];W[rc];B[rb];W[pa];B[qb];W[rd];B[sb];W[lb];B[kb];W[ra];B[qa];
W[kc];B[jb];W[sc];B[oa]
C[A ko fight, but unfavorable to Black, as White has ko threats,
beginning with 'a'.]
LB[le:a])

(;B[rc];W[pb];B[qb];W[lb];B[kb];W[ra])
)
)

(;W[le]C[White 18 is a mistake.];B[nc];W[kd];B[lc];W[me];B[ke])
)

(;B[lc]C[Black 17 is too mild.];W[ld];B[kd];W[ke];B[jd];W[lf];B[oh];
W[pj]
C[White has a very favorable center position for the fight ahead;
adequate compensation for Black's situation at top.]
;B[mg]
C[Black looks more solid at top than he really is. The continuation
demonstrates.]
;W[nc];B[nb];W[ob]
C[Now Black faces an uncomfortable choice: 'a' or 'b'.]LB[pb:b][mb:a]
(;B[mb];W[rc])

(;B[pb];W[mb];B[oa];W[kc];B[lb];W[kb]
C[White successfully separates the Black stones.])
)
)

(;B[ld];W[nc];B[nb];W[mb];B[mc]C['A' is correct, 'B' is a mistake.]
LB[me:B][ob:A]
(;W[ob];B[na]C['A' is correct, 'B' is a mistake.]LB[ma:B][me:A]
(;W[me]C[Black continues with 'a' or 'b'. 'c' is inferior.]
LB[le:c][lb:b][pb:a]
(;B[pb];W[le];B[kd];W[ke];B[jd]
C[The result favors White. 'a' is sente.]LB[je:a];W[oh])

(;B[lb];W[rc];B[pb];W[le]
C[With Black's three center stones weak, this also favors White.]PL[2]
;W[rb]C[Later, this is sente.]PL[2];W[pa];B[oa];W[qa])

(;B[le];W[mf];B[lb];W[rc];B[pb];W[lf])
)

(;W[ma];B[ne];W[oa];B[nb];W[na];B[md];W[nb];B[lb];W[rc];B[qb])
)

(;W[me];B[lb];W[rc];B[pb])
)

(;B[md]C[Black 15 is a trick play.];W[nc]
C[White 16 is the only move.

Black continues with 'a' or 'b'.]
LB[ne:b][mc:a]
(;B[mc]C[White continues with 'a'. White 'b' is a mistake.]
LB[nb:b][ne:a]
(;W[ne];B[nb];W[me]
C[Black continues with 'a'. Black 'b' can lead to ko. Black 'c'
is not recommended.]
LB[le:c][ph:b][oh:a]
(;B[oh];W[ke]
C[Black continues with 'a'.

Black 'b' starts a fight that is tougher on Black than White.]
LB[qi:b][lb:a]
(;B[lb];W[pj]C[White has a satisfactory result.])

(;B[qi]C[Black 23 is not recommended.];W[rc]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[rb:b][lb:a]
(;B[lb];W[qb];B[pb];W[pa];B[ob];W[ph];B[pi];W[oi])

(;B[rb]C[Black 25 is not recommended.];W[ri];B[ph];W[rg];B[qj];W[rj];
B[qk];W[mb];B[ob];W[lc]C[White 'a' is also sente.]LB[rd:a])
)
)

(;B[ph];W[pg];B[og];W[oh];B[qg];W[pi]
C[Black continues by filling the ko at 'a'.

Black 'b' is a mistake.]
LB[rg:b][pg:a]
(;B[pg]C[There is nothing that White can do to salvage the situation.])

(;B[rg]C[Black 27 is a mistake.];W[pg];B[rf]
C[White may try 'a' or 'b'.]LB[rd:b][ph:a]
(;W[ph])

(;W[rd];B[ph])
)
)

(;B[le]C[Black 21 is not recommended.];W[ng]
C[Black continues with 'a'. Black 'b' leads to a game-deciding
ko.]
LB[ph:b][nf:a]
(;B[nf];W[mf];B[mg];W[lf];B[nh];W[ke]
C[White also has the squeeze play at the marked stone.]MA[pg])

(;B[ph]
C[Black 23 is a game-ending mistake involving a ko for which no
threat is large enough.]
;W[pg];B[og];W[oh];B[qg];W[pi]
C[If Black continues with 'a', White takes the ko; there is no
threat big enough to stop White from capturing; the game is over.]
LB[rg:a])
)
)

(;W[nb];B[ne];W[mb];B[lb];W[ob];B[pb];W[rc];B[pa]
C[The White stones are captured.

White may try 'a' or 'b'. Neither work.]
LB[qb:b][qa:a]
(;W[qa];B[rb])

(;W[qb]C[White 26 goes for ko.];B[rb];W[ra];B[ma])
)
)

(;B[ne];W[mc]C[Black continues with 'a' or 'b'.]LB[ld:b][lc:a]
(;B[lc];W[lb];B[ld];W[ob];B[pb]C[White continues with 'a' or 'b'.]
LB[nb:b][kb:a]
(;W[kb];B[nb];W[mb];B[oa];W[jd])

(;W[nb];B[kb];W[rc];B[pa];W[qa];B[rb];W[oa];B[qb];W[sb];B[ra];W[ma];
B[rd]
C[White can later aim at a ko at the marked location, but not immediately
(with the stones as is).]
MA[sd];W[tt]C[White plays elsewhere.];B[qg];W[rg];B[pg];W[rf];B[sc]
C[White is still low, so the thrust of Black 36 was successful.])
)

(;B[ld];W[ob];B[pb]C['A' or 'B'.]LB[nb:B][kb:A]
(;W[kb];B[kc];W[nb]
C[White 24 is sente, as Black must make eyes in the corner by playing
'a'.

White 'b' is a mistake.]
LB[lb:b][rb:a]
(;B[rb];W[jc])

(;B[lb]
C[Black 25, preventing White from escaping, seals the fate of the
Black corner stones: Black loses the race to capture.]
;W[rc];B[rb];W[pa];B[qb];W[sc]C[Black loses the race to capture.])
)

(;W[nb]C['A' or 'B'.]LB[lc:B][rb:A]
(;B[rb];W[kc])

(;B[lc];W[lb];B[kb];W[rc]C['A' is correct, 'B' is inferior.]
LB[pa:B][rb:A]
(;B[rb];W[pa];B[qb];W[rd];B[sb];W[ma];B[oa])

(;B[pa];W[qa];B[rb];W[oa];B[qb];W[sb];B[ra];W[ma];B[rd];W[pg];B[mf]
C[White is secure, but against Black there is still the ko on A.]
LB[sd:A])
)
)
)
)
)

(;B[me]C[White continues with 'a *'. White 'b' is a mistake.]
LB[md:b][nc:a]
(;W[nc];B[lc]
C[White continues at 'a *' or 'b'. White 'a' starts a fight. White
'b' gives up the three White stones.]
LB[rc:b][ob:a]
(;W[ob];B[pb];W[nb];B[rb];W[rd];B[qa];W[lb]
C[Black continues with 'a *'. Black 'b' is unreasonable, but White
must counter well or lose the game.]
LB[kb:b][kc:a]
(;B[kc];W[kb];B[jc];W[jb];B[ic];W[ib];B[mg]C['A *' or 'B'.]
LB[qk:B][qj:A]
(;W[qj]C[
* GOOD VARIATION *])

(;W[qk];B[gc])
)

(;B[kb]
C['A' is correct, 'B' leaves possibilities for Black, 'C' fails.]
LB[kc:C][ld:B][ne:A]
(;W[ne];B[nf];W[ld];B[md];W[mc];B[kc];W[mf];B[le];W[ng])

(;W[ld]C[Black may try 'A' or 'B'. 'C' is a mistake.]
LB[md:C][ph:B][le:A]
(;B[le]C[White continues with 'a'. White 'b' is a mistake.]
LB[kd:b][kc:a]
(;W[kc];B[kd];W[jc];B[md];W[mc]
C[Black cannot win the ko. If Black 'a', White 'b' is a ko threat
in itself.]
LB[ic:b][jb:a])

(;W[kd]C[White 28 is a mistake. White loses.];B[md];W[kc];B[mc];W[mb];
B[jb])
)

(;B[ph]
C[White continues with 'a', giving up the White stones at top (and
30 points of territory) for thickness. 

White 'b' saves the top stones, but the stones at right are hemmed
in (in White gote). This variation is not recommended for White.]
LB[kc:b][qi:a]
(;W[qi];B[md];W[ne];B[nf];W[kc];B[mc];W[mb];B[jb];W[mf];B[le];W[lf];
B[ke];W[ng];B[oh];W[ni];B[pg];W[kf];B[je];W[jf];B[ie];W[nh];B[oa];
W[oi];B[la]
C[White's thickness compensates for the 30 point loss of territory.])

(;W[kc]C[White 28 is not recommended.];B[qi];W[rh];B[ri];W[si];B[pi];
W[sc];B[sb];W[se])
)

(;B[md];W[mc];B[kc];W[ne];B[nf];W[mf];B[le];W[ng]
C[Note that White plays 34, not at 'a'.]LB[lf:a])
)

(;W[kc]C[White 26 is a mistake.];B[ph]
C[Black 27 initiates an exchange that favors Black.];W[qi];B[kd];W[jc]
;B[mb];W[ld];B[la]C[White may try 'a' or 'b'.]LB[md:b][le:a]
(;W[le];B[md];W[mc];B[ne];W[lb];B[qg]
C[The problem is that White has no ko threats...];W[lc]
C[... so must connect...];B[rg]
C[... giving Black considerable profit.])

(;W[md];B[jd]C['a' and 'b' are miai.

White 'c' is a mistake.]
LB[jb:c][ic:b][le:a]
(;W[le];B[ic])

(;W[jb]C[White 36 is a mistake.];B[le]C[Black creates a ko situation.]
;W[mc];B[id]
C[Extending with 39, waiting to play the ko, is good enough for
Black.])
)
)
)
)

(;W[rc]C[Black continues with 'a'. Black 'b' is an overplay.]
LB[rb:b][nb:a]
(;B[nb];W[qb];B[pb];W[pa];B[ob];W[rb]C['A' or 'B'.]LB[mc:B][ne:A]
(;B[ne])

(;B[mc])
)

(;B[rb]C[Black 19 is an overplay.];W[ob];B[pb];W[pa];B[qb];W[mb];B[rd]
;W[kc]PL[2];W[ra]C[Later, White can make a picnic-ko.];B[sc];W[qa];
B[re];W[rf];B[se];W[sb])
)
)

(;W[md]C[White 16 is a mistake.];B[le];W[nb];B[ob]
C[White continues with 'a'. White 'b' is a mistake.]LB[ld:b][kc:a]
(;W[kc]C['A' or 'B'.]PL[2]LB[jd:B][id:A]
(;B[id]C[Black 21 is a good large-scale pressing move.];W[jc];B[je];
W[hc]C[Black continues with 'a' or 'b'.]LB[oi:b][qj:a]
(;B[qj]C[Black 25 provokes Black to the center.])

(;B[oi]C[Black plays this way when the right side is uninteresting.];
W[pj];B[nk])
)

(;B[jd])
)

(;W[ld]C[Black 20 is bad, as it only makes these stones heavier.];
B[kd];W[kc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[jc:b][jd:a]
(;B[jd];W[jc];B[id])

(;B[jc]
C[Black 23 is an overplay, even if the ladder to the lower left
favors Black.]
;W[ke];B[jd];W[ne];B[nf];W[mf];B[lf];W[mg]
C[Black has lost if the ladder is unfavorable. Even with a favorable
ladder, this is not a favorable situation for Black.])
)
)
)

(;B[le];W[nc];B[lc];W[ob];B[pb];W[nb];B[rb];W[rd];B[qa]
C[White continues with 'a' if the ladder is favorable. White may
also play 'b' or 'c' regardless of the ladder.]
LB[me:c][kd:b][ld:a]
(;W[ld]
C[White 24 is a tesuji.

Black continues with 'a'. Black 'b' is a mistake.]
LB[md:b][kd:a]
(;B[kd];W[md]
C[Black continues with 'a' if the ladder is unfavorable. 

If the ladder is unfavorable for White, White has made a serious
mistake, and Black continues with 'b'.]
LB[me:b][mf:a]
(;B[mf];W[kc];B[jc];W[kb];B[jd];W[lb]
C[White has a slightly favorable position, as Black 'a' is not
sente, and the cutting point of 'b' is disfavorable aji.]
LB[ke:b][jb:a])

(;B[me]
C[Black plays 27 if the ladder to the lower left is unfavorable
to White.]
;W[kc];B[kb];W[jc];B[mb]C['A' or, with the ladder, 'B'.]LB[ne:B][jb:A]
(;W[jb];B[ne]
C[Black 'a' is the best Black can do: a flower-viewing ko for White.

Black 'b' results directly in a loss through a snapback.]
LB[ka:b][ma:a]
(;W[ma];B[na];W[oa];B[la];W[mc];B[na]
C[The marked location remains a ko threat for Black if needed.]MA[qg])

(;W[ka];B[na]C[White may try 'a' or 'b'; neither work.]LB[lb:b][oa:a]
(;W[oa];B[ma];W[lb];B[pa];W[mc];B[lc])

(;W[lb];B[oa];W[mc];B[lc])
)
)

(;W[ne]C[White may play 32 with a favorable ladder.];B[nf];W[ke];B[jd]
;W[kf];B[lf]C[Ladder on A.]LB[id:A])
)
)

(;B[md]C[Black 25 is a mistake.];W[ne];B[kd];W[ng]
C[White captures the three Black stones];B[ph];W[oh];B[pg];W[pi];B[qg]
;W[rg];B[rh];W[qi];B[rf];W[sg];B[sf];W[ri];B[sh];W[rg];B[rc];W[og];
B[sg];W[nf];B[rg];W[se]C[White 48 is the winning tesuji.])
)

(;W[kd]
C[White 24 is an older joseki. Black gets a low position, but has
the aji of a potential cutting point.]
;B[ld];W[kb];B[lb];W[la];B[kc];W[jb];B[id];W[hc]
C[White is low, but can aim at 'a'.]LB[mf:a];B[ma]
C[Black 33 may look a reasonable to separate White connection,
but it's not.]
;W[rc];B[sb];W[pa];B[oa];W[na])

(;W[me]
C[White 24 is playable regardless of the ladder.

Black may try 'a' or 'b'.]
LB[ph:b][mf:a]
(;B[mf];W[lf]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[ld:b][md:a]
(;B[md];W[ne];B[nf];W[lb];B[kb];W[lg]
C[Black continues with 'a'. White 'b' and 'c' only look promising.]
LB[mb:c][oa:b][nh:a]
(;B[nh];W[kc];B[ld];W[jb];B[mb];W[ka];B[mc];W[ke];B[oa];W[qk]
C[White discards seven stones, but gains a favorable result.])

(;B[oa];W[mb];B[kc];W[pg]C[White wins the capturing race by one.])

(;B[mb];W[mc];B[ld];W[ma];B[oa];W[jb]
C[White 38 is the tesuji that puts White ahead.])
)

(;B[ld]C[Black 27 is not recommended.];W[nf]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[ne:b][mg:a]
(;B[mg];W[ne]C[Black may try 'a' to 'c'. None work.]
LB[ph:c][ng:b][oh:a]
(;B[oh];W[ng];B[ph];W[qi];B[nh];W[mh];B[lg];W[lh];B[kg];W[pg];B[og];
W[ni];B[qg];W[oi]C[The black stones are captured.];B[rg];W[pi];B[pg];
W[rf])

(;B[ng];W[og];B[pg];W[oh])

(;B[ph];W[oh];B[pg];W[pi])
)

(;B[ne]C[Black 29 is an obvious mistake.];W[mg]
C[Black may try 'a' or 'b'. Neither work.]LB[md:b][oh:a]
(;B[oh];W[md])

(;B[md];W[mf]
(;B[ph];W[oh])

(;B[oh];W[og];B[pg];W[ph];B[ng];W[qg];B[og];W[oi];B[nh];W[mh])
)
)
)
)

(;B[ph]C[White continues with 'a'. White 'b' is a mistake.]
LB[qi:b][lf:a]
(;W[lf];B[qi];W[qg];B[pi];W[ri];B[rj];W[sh];B[ke];W[mg]
C[White 'a' remains as sente.]LB[na:a])

(;W[qi]C[White 26 is an overplay.];B[mf]
C[White may try 'a' or 'b'. Neither work.]LB[ld:b][lf:a]
(;W[lf];B[ld];W[nf];B[mg];W[ng];B[ne];W[md];B[oh];W[mh];B[lg];W[nh];
B[oj]C[White has lost.])

(;W[ld];B[kd];W[md];B[ke];W[kc];B[kb];W[jc];B[mb]
C[White loses the capturing race.])
)
)
)
)
)

(;W[nc];B[qg];W[rg];B[rh]C[Black 15 and 17 are essential.
'A' or 'B'.]
LB[qh:B][rc:A]
(;W[rc];B[rb];W[sb]
C[White prepares for the ko.

Black first plays the hane of 'a' to provide ko material. Jumping
into the ko immediately with 'b' is a mistake.]
LB[rd:b][nb:a]
(;B[nb];W[mb];B[rd];W[sd];B[sc];W[qh];B[pg];W[rc];B[mc]
C[White continues the fight with 'a'. White 'b' and 'c' are mistakes.]
LB[ob:c][re:b][md:a]
(;W[md];B[sc];W[rf];B[se];W[ri];B[ph];W[qi];B[lc]
C[White continues with 'a' or 'b'.]LB[ob:b][ld:a]
(;W[ld];B[lb];W[jd];B[lg]C[Black gets a favorable result.])

(;W[ob];B[ld];W[me];B[le];W[mf];B[lf];W[mg];B[pi];W[qk];B[pk])
)

(;W[re]C[White 30 is a mistake.];B[md];W[qi];B[ne]
C[The result greatly favors Black.])

(;W[ob]C[White 30 is a mistake.];B[sc];W[rf];B[se];W[ri];B[ph];W[qi];
B[md];W[ne];B[mf])
)

(;B[rd]C[Black 21 is a mistake.];W[sd];B[sc];W[qh];B[pg];W[rc];B[rf];
W[re];B[sg];W[qb])
)

(;W[qh]C[White 18 gives Black a favorable result.];B[pg];W[rf];B[qi];
W[rc];B[rb];W[rd];B[nb];W[mb];B[ob];W[lc];B[sb];W[se];B[ph])
)
)

(;B[pg]
C[White continues with 'a *' or 'd'. White must have the ladder
to play 'b'. White must also have the ladder to play 'c', which
White can use to simplify the position.]
LB[qg:d][of:c][rh:b][ne:a]
(;W[ne];B[of]C['A *' and 'B *' are joseki.]LB[rh:B][qg:A]
(;W[qg]C[Black continues with 'a *' or 'b'.]LB[nf:b][ph:a]
(;B[ph]C[White continues with 'a *'. White 'b' is premature.]
LB[nc:b][qh:a]
(;W[qh];B[pi];W[nc];B[qi];W[rc];B[rb];W[rd];B[nb];W[mb]
C[Black continues with 'a *'. Black 'b' may be playable if Black
has a favorable ladder to capture a cutting stone at the marked
location.]
LB[na:b][ob:a]MA[mc]
(;B[ob]C[White continues with 'a *'. White 'b' is not recommended.]
LB[sb:b][lc:a]
(;W[lc];B[sb];W[ri];B[rj];W[sh];B[lg]
C[
* GOOD VARIATION *

Black must not connect at 'a', as letting White play 'b' is bad.]
LB[mg:b][qk:a])

(;W[sb]C[White 28 is not recommended.];B[lb];W[mc];B[ma];W[kc];B[kb];
W[jc];B[lc];W[ld];B[jb];W[ic];B[ib];W[hc];B[hb];W[gc]
C[White seems to have built some thickness, but...
'A' or 'B'.]
LB[le:B][qb:A]
(;B[qb];W[ri];B[rj];W[sh];B[le];W[kd];B[nf])

(;B[le]C[Black can erase it.];W[ke];B[nf];W[md];B[ra];W[ri];B[rj];
W[sh];B[kf]C[Black 51 is a tesuji.];W[lf]C[If White 52...];B[lg])
)
)

(;B[na]
C[This variation occurred in a 2002 game between 9-dan Chinese
professionals Feng Yun and Jiang ZhuJiu.]
;W[ra];B[sb];W[pa];B[pb];W[ma];B[ob];W[qb];B[qa];W[ri];B[sa]
C[White can play 'a' if the two White stones at top cannot be caught
in a ladder if Black cuts.]
LB[lc:b][qj:a]
(;W[qj]
C[White must have the ladder at the cutting point shown to play
this way.]
MA[mc];B[nf]C[Black plays here if the cut cannot be made.];W[ld])

(;W[lc]
C[White must play this way without a favorable ladder for the cutting
point.]
MA[mc];B[rj];W[sh])
)
)

(;W[nc]C[White 18 is not recommended.];B[qh];W[rc];B[rb];W[rd];B[nb];
W[mb];B[ob];W[lc];B[sb];W[rh];B[ri];W[sh];B[qj]LB[sf:a]
(;W[sf]C[White must play 32 or die.];B[lg])

(;W[mg]
C[White 32 (or any other move than the marked location) is a mistake:
White dies.]
MA[sf];B[sf];W[rf];B[se];W[sc];B[sg])
)
)

(;B[nf]
C[White continues with 'a' or 'b'. White must have the ladder to
play 'b'.]
LB[ph:b][nc:a]
(;W[nc];B[qh];W[rh];B[ri];W[rc];B[rb];W[rd];B[nb];W[mb];B[ob];W[qi];
B[ph];W[rj];B[me]
C[It is difficult to White to save the four stones. White may try
'a' to 'c'.]
LB[ld:c][lc:b][mc:a]
(;W[mc];B[lc];W[lb];B[kc];W[kb];B[jc])

(;W[lc];B[ld];W[mc];B[jc]C[White may try 'a' or 'b'.]LB[kd:b][kc:a]
(;W[kc];B[jd])

(;W[kd];B[ke])
)

(;W[ld]AW[dd]
C[White may play 32 if he has occupied the star-point as shown.];B[pi]
;W[qj];B[md];W[mc];B[lc];W[lb];B[kc];W[kb];B[jc];W[jb];B[ic];W[sb];
B[qa];W[hb];B[hc];W[gb];B[fc];W[gc];B[gd];W[ib];B[fe];W[mf];B[le];
W[mg]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[mi:b][ke:a]
(;B[ke]
C[Black 57 is the vital point. Letting White play there and squeeze
is bad.]
;W[mi]C[The joseki ends.];B[nh]
C[Black 59 is an explemplary continuation.];W[mh];B[ok]
C[White may try for a two-stage ko with 'a', or risk damage with
a direct ko beginning with 'b'.]
LB[na:b][si:a]
(;W[si]
C[Later, after playing White 62, the best White can do is get a
two-stage ko.]
;B[pb];W[ra])

(;W[na]
C[White 62 is a direct ko, but White is in peril if losing the
ko.];
B[oa];W[pb];B[rg];W[si];B[rf];W[re];B[sa]
C[White risks considerable damage if she loses the ko.])
)

(;B[mi]C[Black 57 or another similar move is a mistake.];W[ke];B[kd];
W[lf];B[ld];W[je])
)
)

(;W[ph]
C[White must have the ladder. The continuation is based upon this.

Black continues with 'a' or 'b'. 'c' is not recommended.]
LB[oh:c][mf:b][me:a]
(;B[me];W[md];B[le];W[ld];B[ke];W[kd]C['A' or 'B'.]LB[jd:B][je:A]
(;B[je])

(;B[jd];W[jc];B[id];W[ic];B[hd];W[nb];B[ob];W[hc];B[gd];W[fc])
)

(;B[mf];W[nc];B[nb];W[mb];B[ob];W[ld]
C[After this, 'a' and 'b' are miai for Black.]LB[qj:b][id:a])

(;B[oh];W[pi];B[me];W[md];B[ld])
)
)
)

(;W[rh];B[nc];W[nf];B[ph]C['A *' is joseki, 'B' a variation.]
LB[nh:B][qi:A]
(;W[qi];B[rg];W[rf];B[ng]C['A *' is joseki, 'B' a variation.]
LB[mg:B][le:A]
(;W[le];B[lg];W[mc];B[mb];W[lc];B[lb];W[jc]C[
* GOOD VARIATION *];
B[pk])

(;W[mg]C['A' or 'B'.]LB[mh:B][md:A]
(;B[md]
(;W[le];B[mh]C['A' is correct, 'B' no help.]LB[nh:B][lg:A]
(;W[lg])

(;W[nh];B[ni])
)

(;W[nh];B[ni];W[mi];B[oh])
)

(;B[mh];W[nh];B[ni];W[og];B[oh];W[ng];B[oj])
)
)

(;W[nh];B[rg];W[qg];B[qh];W[rf];B[ri];W[sg];B[pj];W[rd];B[md])
)
)

(;W[rh]
C[White must have the ladder to play White 14 here: 'a' shows the
continuation. Black 'b' shows Black's counter if the ladder is
in Black's favor.]
LB[ne:b][nc:a]
(;B[nc]C[White continues with 'a' or 'b'.]LB[md:b][ne:a]
(;W[ne];B[of]
C[White 'a' is the correct continuation. White 'b' is a mistake.]
LB[qi:b][nf:a]
(;W[nf]C[Black continues with 'a', possibly the more reserved 'b'.]
LB[ng:b][ph:a]
(;B[ph];W[qi];B[rg];W[rf];B[ng]C[White continues with 'a' or 'b'.]
LB[mg:b][le:a]
(;W[le]C[Black continues with 'a' or 'b'.]LB[kc:b][lg:a]
(;B[lg];W[mc];B[mb];W[lc];B[lb];W[jc];B[qg];W[sg];B[pk]
C[White continues with 'a'. The counterattack of White 'b' is not
recommended.]
LB[pi:b][rk:a]
(;W[rk]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[ql:b][pi:a]
(;B[pi];W[ql])

(;B[ql]AB[ce][dp]AW[dc][dh][pq]
C[Black 35 is reckless.

Yamabe played 35 against Sakata in a 1966 match, and regretted
the move.]
;W[pi];B[oi];W[oj];B[pj];W[ni];B[oh];W[rl];B[qm];W[nj];B[nh];W[qo];
B[nl];W[li];B[jg];W[rn]
C[White 50 is a tight move that avoids the sente block at the marked
location.]
MA[rm])
)

(;W[pi]C[White 34 is an overplay.];B[oi];W[oj];B[pj];W[ni];B[oh];W[nj]
C[White 40 is sente. Black continues with 'a'. Black cannot play
somewhere else, such as 'b'.]
LB[rj:b][nh:a]
(;B[nh];W[rk];B[rj];W[qj];B[qk];W[sj];B[rl];W[ri];B[ol];W[rc];B[rb];
W[rd];B[lj]
C[White faces great difficulty trying to pull out the three White
stones. White 'a' offers better prospects than 'b'.]
LB[nl:b][mk:a]
(;W[mk];B[kl];W[mm];B[on]C[White faces a very difficult fight.])

(;W[nl]C[White 54 is a mistake.];B[nm];W[ml];B[nk];W[mk];B[mj];W[ok];
B[mi];W[nk];B[om])
)

(;B[rj]C[A move such as Black 41 is a mistake. Black must connect.]
MA[nh];W[mg];B[mh];W[nh];B[mf];W[qh];B[og];W[mg])
)
)

(;B[kc];W[mg];B[mh]C[White continues with 'a' or 'b'.]LB[lg:b][nh:a]
(;W[nh];B[ni];W[og];B[oh];W[ng];B[mi];W[pk];B[oj])

(;W[lg];B[qg];W[sg];B[ni];W[ql])
)
)

(;W[mg]
C[White 24 is a tough-minded move.

Black continues with 'a' to 'd'.]
LB[md:d][mf:c][nh:b][mh:a]
(;B[mh];W[nh];B[ni];W[og];B[oh];W[ng];B[oj];W[ql];B[lh];W[ld];B[mc];
W[kf];B[kc])

(;B[nh];W[lf];B[mh];W[lh];B[li];W[kh];B[ki];W[jh])

(;B[mf];W[nh];B[og]
C[White continues with 'a'. White 'b' and 'c' are mistakes.]
LB[md:c][le:b][lf:a]
(;W[lf];B[me];W[md];B[le];W[ld];B[ke];W[kd];B[mh];W[lg];B[je];W[jd];
B[ie]C[White continues with 'a' or 'b'.]LB[hc:b][mi:a]
(;W[mi];B[id]C[White continues with 'a'. White 'b' doesn't work.]
LB[pi:b][ic:a]
(;W[ic];B[hc];W[jb];B[ib];W[jc];B[pi]C[Black escapes.];W[hb];B[gb];
W[ia];B[qg];W[sg];B[pj])

(;W[pi]C[White 42 is a mistake.];B[ni];W[lh];B[oi]C[Black escapes.])
)

(;W[hc];B[qg];W[sg];B[ni];W[lh];B[mi];W[li];B[lj];W[kj];B[lk]
C[The fighting will continue to uncertain outcome. Black has the
threat of the checking extension at 'a'.]
LB[qk:a])
)

(;W[le]C[White 28 lacks force.];B[lf];W[ld];B[mh];W[lg];B[kf]
C[White cannot possibly get a good result.];W[mb];B[ni];W[rc];B[rb];
W[rd];B[mc];W[lc];B[sb]
C[Black easily lives in the corner with 41.

Black still has the sente threat of 'a', followed by Black 'b'.
There is also the threat of Black 'c'.

This result clearly favors Black.]
LB[jd:c][sg:b][qg:a])

(;W[md]
C[Black continues with the tesuji of 'a', or possibly 'b' is Black
has a favorable ladder.]
LB[lf:b][ld:a]
(;B[ld]C[Black 29 is a tesuji.

White continues with 'a' or 'b'.]
LB[le:b][lf:a]
(;W[lf];B[mc];W[me];B[le];W[mf];B[mh];W[kf];B[ni];W[lh];B[mi])

(;W[le]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[lg:b][mh:a]
(;B[mh];W[lg];B[mc];W[me];B[ke];W[lf];B[ni];W[lh];B[mi]
C[White continues with 'a' or 'b'.]LB[pi:b][kd:a])

(;B[lg]C[Black 31 is not recommended.];W[mh]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[lf:b][mc:a]
(;B[mc];W[me];B[ke];W[lf];B[kf];W[mf]
C[Black has too many cutting points, and the Black group on the
right is now in danger.])

(;B[lf]
C[Black 33 is a mistake, creating a race to capture that White
wins.];
W[lc];B[kd];W[mc];B[kc];W[kb];B[jb];W[lb]
C['b' and 'c' are miai. White wins the race to capture.

Black may try 'a', but again loses.]
LB[pi:c][jc:b][me:a];B[me];W[ja];B[ib];W[nb];B[ob];W[pi])
)
)

(;W[mc];B[lc];W[mb];B[le];W[lb];B[kb];W[kc];B[jc]
C[White continues with 'a'. White 'b' is a mistake.]LB[lf:b][kd:a]
(;W[kd]
C[Black continues with 'a', or 'b' if this is the only way for
Black to have a favorable ladder.]
LB[jd:b][ke:a]
(;B[ke];W[jd];B[id];W[lf];B[je];W[me];B[pi];W[rc];B[rb];W[rd];B[nb];
W[sb];B[pb]C[Black 'a' is sente; the corner is a ko.]LB[na:a])

(;B[jd]
C[Black plays 39 only if it is the only way for Black to get a
favorable ladder. This variation is slightly more favorable to
White than playing on top of White 38.]
;W[lf];B[ke];W[me])
)

(;W[lf]C[White 38 is suicidal.];B[me];W[kd];B[ke];W[jd];B[je];W[id];
B[jb])
)
)

(;B[lf]C[Black might play 29 with a favorable ladder.])
)
)

(;B[md]C[White continues with 'a'. White 'b' is not recommended.]
LB[nh:b][le:a]
(;W[le]C[White 26 is the proper move, showing good style.];B[mh];W[lg]
;B[lh]C[Black 29 is a likely continuation])

(;W[nh]C[White 26 is not recommended.];B[ni]
C[Black 27 aims to set up a ko.]
(;W[mi];B[oh]
C[Black has a perfect ko threat at 'a', so White is at considerable
disadvantage.]
LB[qg:a])

(;W[oh]C[White 28 is a mistake.];B[mh];W[og];B[oi];W[ng];B[lg];W[lf];
B[mf];W[me];B[le])
)
)
)
)

(;B[ng];W[mg];B[oh]
C[Black 21, seemingly yielding, is a cagey move.

Black 21 was invented by Kajiwara Takeo. Variation 'a' is as
first played in the 2nd round of the 1964 Oza title match against
Otake Hideo.

White 'b' is not recommended.]
LB[nh:b][qg:a]
(;W[qg];B[ph]
C[White continues with 'a'. White 'b' is not recommended.]
LB[qj:b][mh:a]
(;W[mh]C[Original game continuation.];B[ri];W[rc];B[rb];W[sd];B[qh];
W[sh];B[ld];W[lf];B[jd];W[qj];B[pj];W[qi];B[qk];W[rj];B[nj];W[lj])

(;W[qj]C[White 24 is not recommended.];B[mh]
C[White may try 'a' or 'b'.]LB[lg:b][lf:a]
(;W[lf];B[lg];W[mf];B[kg]C[White will have trouble making good shape.])

(;W[lg];B[le]C[Black 27 is the obvious move to ruin Black's shape.])
)
)

(;W[nh]C[Black continues at 'a' or 'b'.]LB[rg:b][qh:a]
(;B[qh];W[rg];B[qj];W[ri];B[ni];W[mh];B[md])

(;B[rg];W[qg];B[qh];W[rf];B[ri];W[sg];B[qi])
)
)
)

(;W[qi];B[nf]C[The three white stones lose vital liberties.])
)

(;W[md];B[nf]C[White continues with 'a', 'b' or 'c'.]
LB[qi:c][mc:b][rc:a]
(;W[rc];B[rb];W[sd];B[lc];W[ld];B[kc];W[lf])

(;W[mc]C[Black continues with 'a' or 'b'.]LB[qh:b][rd:a]
(;B[rd];W[re];B[qg];W[rg];B[se];W[rf];B[rb];W[pi];B[lg]
C['a' and 'b' are miai.]LB[qk:b][jd:a])

(;B[qh];W[rg];B[qj];W[ri];B[qi];W[rc];B[rb];W[rd];B[mb];W[lb];B[ma];
W[kd])
)

(;W[qi];B[lf])
)
)

(;B[ne];W[md];B[me];W[ld]C['A' or 'B' are basically the same.]
LB[le:B][qh:A]
(;B[qh];W[ri];B[rg];W[qg];B[rf];W[ph];B[qi];W[of];B[og];W[qj];B[pi];
W[oh];B[ng];W[oi])

(;B[le];W[kd];B[qh];W[ri];B[rg];W[qg];B[rf]
(;W[rd];B[rc];W[ph];B[qi];W[of];B[og];W[qj];B[pi];W[oh];B[ng];W[oi])

(;W[ph];B[qi];W[of];B[og];W[qj];B[pi];W[oh];B[ng];W[oi])
)
)
)

(;W[of]C[White must have the ladder to play 14.];B[ne];W[og];B[md];
W[ph])

(;W[qg];B[ne];W[md];B[me];W[ld];B[le];W[kd];B[qh];W[rh];B[ri];W[ph];
B[qi];W[rc];B[rb];W[sb];B[rg];W[rf];B[rd];W[sd];B[sc];W[of];B[og];
W[rc];B[mb];W[lb];B[sc];W[oh];B[ng];W[rc];B[mc];W[re];B[lc];W[jc];
B[jb];W[ib];B[kb]C['A' or 'B'.]LB[nh:B][hd:A]
(;W[hd])

(;W[nh])
)
)

(;B[ne]
C[White must have the ladder.
'A *' is correct, 'B' is a mistake.]
LB[nc:B][md:A]
(;W[md]
C[White 14 is the only possible good move.

Black continues with 'a *' or 'b *'.]
LB[pg:b][me:a]
(;B[me];W[ld];B[le];W[kd];B[ke]C['A' or 'B'.]LB[jd:B][nb:A]
(;W[nb];B[ob];W[jd]C['A *' or 'B'.
'A' is a trick play.]LB[qg:B][qh:A]
(;B[qh]C[White continues with 'a *'. White 'b' is not recommended.]
LB[rh:b][pg:a]
(;W[pg];B[ph]
C[White continues with the tesuji of 'a *'. White 'b', 'c' and
'd' is getting tricked, because White's life will depend on a
ko.]
LB[qg:d][of:c][og:b][rh:a]
(;W[rh]C['A' to settlem 'B' to start a fight.]LB[rg:B][ri:A]
(;B[ri];W[og];B[qg];W[of];B[nh]C[
* GOOD VARIATION *];W[oh];B[oi];
W[rg];B[pi];W[ng];B[mg];W[mh];B[ni];W[lg];B[mf];W[rc];B[rb];W[sc]
C[Black continues with 'a'. Black 'b is an overplay.]LB[sh:b][sb:a]
(;B[sb];W[re]LB[kh:b][je:a]
(;B[je]C[White continues with 'a'. White 'b' is not recommended.]
LB[lh:b][ie:a]
(;W[ie];B[kh];W[if];B[lh])

(;W[lh]C[White 48 is an overplay.];B[ie])
)

(;B[kh]C[Black 47 is an overplay, considering White can escape.];W[lh]
;B[ki];W[kg];B[jg];W[mj];B[mi];W[li];B[lj];W[kj];B[lk];W[jh];B[ji];
W[jf];B[ih];W[kf];B[je];W[if];B[ie])
)

(;B[sh]
C[Black 45 aims to kill, but White wins the capturing race with
a sacrifice.]
;W[sf];B[re];W[rd];B[se];W[sb];B[qb];W[pa];B[nf]
C[White continues with 'a'. White cannot save the center stones
with 'b'.]
LB[pf:b][oa:a]
(;W[oa];B[pf];W[rf];B[si];W[nc];B[ra];W[qa];B[sg];W[sd];B[se];W[na])

(;W[pf]C[White can resign now.];B[ra];W[oa];B[si];W[nc];B[sg];W[rf];
B[sa];W[sd];B[se];W[re];B[se])
)
)

(;B[rg];W[qg];B[ri];W[ng])
)

(;W[og]C[White 26 is a mistake.];B[qg];W[of];B[nh];W[rc];B[rb];W[sb];
B[rd];W[sd];B[sc];W[oh];B[rf];W[oi];B[re];W[pf];B[lh])

(;W[of]C[White 26 is a mistake.];B[ng];W[rc];B[rb];W[sb];B[rd];W[sd];
B[sc]C[White may try 'a' or 'b'.]LB[oh:b][og:a]
(;W[og];B[oh];W[rc];B[re];W[rf];B[sc];W[nf];B[se];W[mg];B[nh];W[mf];
B[je])

(;W[oh]
C[Black continues with the tesuji of 'a'. Black 'b' is a mistake.]
LB[se:b][rf:a]
(;B[rf];W[qg];B[og];W[rc];B[re];W[rg];B[rh];W[sf];B[sc];W[nf];B[se];
W[mg];B[nh];W[mf];B[sg];W[pf];B[je])

(;B[se]C[Black 35 is a mistake.];W[og])
)
)

(;W[qg];B[og];W[of];B[ng];W[rc];B[rb];W[sb];B[rd];W[sd];B[sc])
)

(;W[rh]C[White 24 is a mistake in order.];B[ri];W[pg];B[oh]
C[There are several possible continuations, but generally White
will have to get life on the side while Black builds thickness.])
)

(;B[qg];W[rg];B[pg];W[rh];B[pj];W[rc];B[rb];W[rd];B[sb];W[qk])
)

(;W[jd];B[qh];W[pg];B[ph];W[rh];B[ri];W[og];B[qg];W[of];B[nh];W[oh];
B[oi];W[ng];B[mg];W[rg];B[pi];W[rc];B[rb];W[sc];B[sb];W[mh];B[ni];
W[lg];B[mf];W[re])
)

(;B[pg]
C[White plays 'a *' with a favorable ladder, but must play 'b'
if the ladder to the lower left is unfavorable.]
LB[qg:b][rh:a]
(;W[rh]
C[Black continues with 'a', 'b *' to 'd'.
'a' is only a punishment, if White doesn't have the ladder, not
joseki.]
LB[me:d][ph:c][ng:b][qh:a]
(;B[qh]C['A' is correct, 'B' is a mistake.]LB[qi:B][ri:A]
(;W[ri];B[me];W[ld];B[rg];W[qg];B[rf];W[ph];B[qi];W[of];B[og];W[qj];
B[pi];W[oh];B[ng];W[oi])

(;W[qi];B[me];W[ld];B[le];W[kd];B[ri];W[rg];B[rj])
)

(;B[ng]
C[White continues with 'a *' or 'b'. White 'c' and 'd' not recommended.]
LB[qi:d][rc:c][nb:b][kd:a]
(;W[kd];B[mb]
C[The difference between Black 19 and a White forcing move at 'a'
is big.]
LB[nb:a];W[qi]C['A *' or 'B'.]LB[kh:B][kg:A]
(;B[kg];W[id]C[
* GOOD VARIATION *])

(;B[kh];W[id])
)

(;W[nb];B[qg];W[rg];B[rd];W[se];B[ob];W[me];B[mf];W[lf];B[lg];W[kf];
B[qi];W[ri];B[qj];W[rc];B[rb];W[sc];B[sb];W[sd];B[kg];W[jf])

(;W[rc]C[White 18 is too small.];B[rb];W[sd];B[mb];W[lc];B[lb];W[jc];
B[lf])

(;W[qi]C[White 18 is a mistake.];B[ke];W[nb];B[qg];W[rg];B[rd];W[se];
B[ob]C[White will have trouble settling the group at top.])
)

(;B[ph];W[qi]
C[Black continues with 'a'. Black 'b' is not reocmmended.]
LB[rd:b][mb:a]
(;B[mb];W[me];B[ng])

(;B[rd]C[Black 19 is not recommended.];W[re];B[rg]
C[White continues with 'a'. White 'b' is not recommended.]
LB[qg:b][rc:a]
(;W[rc]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[rb:b][qg:a]
(;B[qg];W[rb];B[mb];W[me]
C['a' and 'b' are now miai. White has no complaints.]LB[lb:b][ng:a])

(;B[rb]
C[Black 23 is not recommended.

White continues with 'a'. White 'b' is a mistake.]
LB[sd:b][qg:a]
(;W[qg];B[qh];W[ri];B[sc];W[sg];B[ng];W[me];B[mf];W[lf];B[lg];W[kf])

(;W[sd]C[White 24 is a mistake.];B[qg];W[sb];B[qb];W[sf];B[sg];W[rf])
)
)

(;W[qg]C[White 22 is a mistake.];B[qh]
C[White continues with 'a' or 'b'.]LB[rc:b][sg:a]
(;W[sg];B[ri];W[rf];B[qj];W[nb];B[rc];W[se];B[ob];W[me])

(;W[rc];B[ri];W[rb];B[lf]
C[With 27, Black willingly discards the four Black stones in the
corner.]
;W[kd];B[jf]
C[White has considerable territory, but Black's thickness holds
considerable promise.])
)
)
)

(;B[me];W[ld];B[le];W[kd];B[ke];W[jd];B[qi];W[rc];B[rb];W[sd];B[sb]
C[White continues with 'a'. White 'b' is premature.]LB[nb:b][ri:a]
(;W[ri];B[if];W[he];B[qj];W[nb];B[ob];W[rj];B[qk])

(;W[nb]C[White 28 is premature.];B[ri];W[ob];B[rg];W[rf];B[qg];W[qb];
B[pb];W[pa];B[qa];W[oa];B[nc];W[mc];B[qb];W[lb];B[sf];W[se]
LB[rd:b][sg:a]
(;B[sg]C[Black creates a seki.];W[ra];B[rd];W[re]
C[The corner is a seki, leaving Black with superior thickness.])

(;B[rd]C[Black goes for an approach-move-ko.];W[re];B[sc])
)
)
)

(;W[qg]
C[White 16 is an unfortunate necessity if White does not have a
favorable ladder.]
;B[me];W[ld];B[le];W[kd];B[qh];W[rh];B[ri]
C[White continues with 'a'. 

White 'b' is not recommended, but is part of a very famous game.

White 'c' is a mistake.]
LB[rc:c][ph:b][sg:a]
(;W[sg];B[qi];W[rc];B[rb];W[sc];B[sb];W[se]C[White ends in gote.];
B[jf]C[Black gets the choice play.])

(;W[ph]
C[White fearlessly sets up a ko with 21.

This pattern arose in a game between Gen'an Inseki (1798-1859)
and Shusaku (1829-62); the famous game with the "ear-reddening"
move 127 by Shusaku.]
;B[qi];W[rc];B[rb];W[sb];B[rg];W[rf]
C[Black continues with 'a' (as in the game), leaving ko threats.
Taking with 'b' is a fatal mistake.]
LB[sh:b][rd:a]
(;B[rd];W[sd];B[sc]
C[White continues with 'a'. White 'b' is too leisurely.]LB[oh:b][of:a]
(;W[of];B[og];W[rc];B[mb];W[lb];B[sc];W[oh];B[ng];W[rc];B[mc];W[re];
B[lc]C[Black gets a favorable result.];W[jc];B[jb];W[ib];B[kb];W[nh];
B[mg];W[ic];B[qb];W[nj];B[sh];W[sf];B[qm])

(;W[oh]C[White 34 is a fatal mistake.];B[sf];W[sg];B[re];W[se];B[sf];
W[se];B[of]C[White has lost.])
)

(;B[sh]C[Black 31 is a mistake.];W[qb];B[rd];W[sd];B[sc];W[of];B[og];
W[rc]C[Black has no good ko threats.])
)

(;W[rc]C[White 24 is a mistake.];B[rb];W[sb];B[rg];W[rf];B[sh];W[rd];
B[qb];W[nb];B[se];W[sf];B[ra])
)
)
)

(;W[nc]
C['A' is one of different punishments, 'B' gives Black too much
influence.]
LB[pg:B][nb:A]
(;B[nb];W[mb];B[ob];W[ld];B[me];W[kd];B[qg];W[rg];B[qh];W[rh];B[qi];
W[rc];B[rb];W[rd];B[sb];W[ri];B[qj])

(;B[pg];W[rh];B[rd];W[re];B[qg];W[rg];B[se];W[rf];B[me];W[lc];B[rb];
W[pi];B[ld];W[mb];B[kc];W[kb];B[md];W[mc];B[jc];W[jb];B[ic];W[ob];
B[pb];W[oa])
)
)

(;B[ld]
C[Black 13 is a trick play.

For other possible continuations than the one given, learn what
happens if, instead of Black 13 here, Black plays X, White Y,
Black Z or 13.]
LB[mc:Z][qh:Y][of:X];W[ne]
C[White first needs to provide escape for the two stones.];B[of];W[qh]
C[White 16 is the only continuation.])
)

(;W[nc]
C[Black 'a' is the correct refutation. 

 'b' looks like a better move, and it leads to a more favorable
position for Black. However the continuation is more complex,
with more room for error. 'b' is where White needs the ladder.

Black can always get a good result with 'c'.

Black 'd' leads to a good result. Depending on the surrounding
positions, the outcome can be reasonable for White too.]
LB[of:d][ne:c][qf:b][nb:a]
(;B[nb];W[mb];B[qf];W[rf];B[rg];W[rc];B[rb];W[of];B[ne]
C[White 'a' shows how both settle the position, resulting in a
slightly more favorable position for Black.

White 'b' shows how White can introduce further complications
in the position. This leads to a favorable ko for Black, but
there is plenty of scope for a slip-up.]
LB[me:b][qg:a]
(;W[qg];B[mc]
C[If both marked groups are now captured, the result is considered
favorable for Black.]
TR[qf][pf]MA[od][nd][nc];W[pg];B[md])

(;W[me];B[nf];W[og];B[md];W[mc];B[pg];W[ph];B[qg];W[rd];B[sf];W[qb];
B[pb];W[ra];B[qa];W[se];B[re];W[sb];B[qb];W[rf];B[sg];W[qh])
)

(;B[qf];W[rf];B[rg];W[rc]
C[Black continues with 'a'. Black 'b' is possible, as shown by
the professional game from which this variation came.]
LB[sf:b][rb:a]
(;B[rb];W[of];B[ne];W[qg]
C[Black 'a' leads to White setting up a ladder at 'a'. Black 'b'
prevents the ladder, but the result is hardly better.]
LB[me:b][pg:a]
(;B[pg];W[me]
C[White captures two stones in a ladder, as White 'a' is atari.]
LB[og:a];B[nf];W[og];B[ph];W[ng])

(;B[me];W[pg];B[nb]
C[White has made a very thick capture. Later in the game White
may have an opportunity to pull out the marked stones at the
top.]
MA[od][nd][nc])
)

(;B[sf]
C[Black 17 was played by Yoshi Ishida against Sakata Eio in the
1st game of the 1975 Honinbo title.]
;W[rd];B[rb];W[qb];B[pb];W[ra];B[qa];W[sb];B[sa];W[of];B[ne];W[ra];
B[me];W[qb];B[nb];W[pa];B[ob];W[og];B[ph];W[mc];B[lc];W[mb];B[lb];
W[na];B[mg]
C[Black 41 is the proper continuation, but not the continuation
of the 1st 1975 Honinbo title game.

Given the situation as shown, Black has a favorable outcome,
given the solid thickness on both sides, despite the corner sacrifice.])
)

(;B[ne]
C[Ishida Yoshio considered this move, playing Sakata Eio during
the first game of the 1975 Honinbo title match. He discarded
it, although it was actually the best move in that position.

White has a reasonable continuation at 'a'. White 'b' leads to
a favorable position for Black. White 'c' does not work.]
LB[ob:c][qf:b][me:a]
(;W[me];B[qg]C[Black 15 is simple but effective.])

(;W[qf]C[White 14 is not recommended.];B[me];W[nb];B[rd];W[pg];B[lc];
W[ob];B[pb]
C[White's only chance is to set up a semeai with the corner at
'a'. The result is a seki, but favorable for Black.

Trying to break out at 'b' doesn't work.]
LB[lb:b][pa:a]
(;W[pa]C[White 22 creates a seki, to Black's advantage.];B[rb];W[ra];
B[mb];W[re];B[sb];W[sd];B[rc];W[qa];B[oa];W[se];B[md];W[sc];B[mc];
W[na];B[ma];W[oa]
C[Black's thickness is an order of magnitude better than White's.])

(;W[lb];B[of];W[qh];B[kb];W[kc];B[kd];W[jc];B[mb])
)

(;W[ob];B[pb];W[nb];B[qf]
C[Black captures the marked white stones, regardless of what White
tries next.]
MA[qe][pe][qd];W[rc];B[rb];W[pa];B[qb];W[rf]
C['a' is the key move for Black.

Black 'b' reduces the effectiveness of the extension of Black
13.]
LB[rg:b][sd:a]TR[ne]
(;B[sd];W[re];B[rg];W[qg];B[pg]C[White 'a' nor 'b' work.]
LB[sg:b][qh:a]
(;W[qh];B[sf])

(;W[sg];B[rh]
C[If White plays 'a', Black captures cleanly. If White plays 'b'
it becomes ko, but White will never have a big enough threat.]
LB[sb:b][sc:a]
(;W[sc];B[sb];W[rd];B[se])

(;W[sb];B[rd];W[ra])
)
)

(;B[rg];W[rd]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[sc:b][sb:a]
(;B[sb];W[qg];B[sf];W[re];B[pg];W[qh];B[rh];W[ph]
C[The marked points are White's miai to reduce the effectiveness
of the black wall.]
MA[ri][og])

(;B[sc]C[Black 25 is a mistake.];W[sb]
C[White can now get a ko or seki.])
)
)
)

(;B[of]
C[White continues at 'a' or 'b'. White 'c' has appeared in professional
play.]
LB[re:c][rc:b][qf:a]
(;W[qf]
C[For continuation see the variation of White playing 14 before
12.]
LB[of:13][nc:12][qf:14])

(;W[rc];B[rb];W[rd];B[nb];W[mb]C['A' or 'B'.]LB[qf:B][ob:A]
(;B[ob]C['A' is correct, 'B' is a mistake.]LB[lc:B][qg:A]
(;W[qg];B[mc])

(;W[lc];B[qf];W[rf];B[rg];W[sb];B[qb])
)

(;B[qf];W[sb];B[ob]C[The marked points are miai for White.]TR[qb][mc])
)

(;W[re]AB[cd][ed]
C[White 14 appeared in a game with the marked black shimari in
the upper left corner.]
TR[ed][cd];B[qf];W[rc];B[rb];W[sb];B[nb];W[mb];B[ob];W[ld];B[qb];W[rf]
;B[rg];W[rh];B[sg];W[sf];B[qh];W[sd];B[pa];W[ic]
C[The relationship of White 32 with the black position in the upper
left makes this a playable variation for both sides.])
)
)
)

(;B[qf]C[White punishes on 'A',
'B' is possible only with the ladder.]
LB[nc:B][qc:A]
(;W[qc];B[nc];W[md];B[mc];W[ld]C[Black has two weaknesses now.]
(;B[kc];W[of];B[ne];W[og];B[mf];W[rf];B[qg];W[qh];B[rg];W[rh];B[re];
W[sg];B[sf];W[sh];B[rd];W[pg];B[rf];W[rc]
(;B[ke];W[kd];B[jd];W[lc];B[lb];W[kb];B[jc];W[mb];B[le];W[la];B[me];
W[lb];B[nb];W[pb])

(;B[kd];W[le];B[kf];W[lf];B[lg];W[nf])
)

(;B[lc];W[kd];B[kc];W[of];B[ne];W[og];B[mf];W[rf];B[qg];W[qh];B[rg];
W[rh];B[re];W[sg];B[sf];W[sh];B[rd];W[pg];B[rf];W[rc];B[jd];W[kf])
)

(;W[nc];B[qc]C['A' starts the ladder.
'B' -> sente ko for Black.]
LB[rf:B][of:A]
(;W[of];B[ne];W[rf];B[rg];W[qg];B[pg];W[me];B[nf];W[og];B[ph];W[ng];
B[mf];W[lf])

(;W[rf];B[rg]
(;W[qg];B[re];W[rd];B[sf];W[of];B[ne];W[pg];B[rf])

(;W[re];B[og];W[rc];B[rb];W[sb];B[qb];W[ob];B[sd];W[sc];B[sf];W[rd];
B[sg];W[se];B[sa];W[ra];B[qa];W[pa];B[sa])
)
)
)
)
)
)

(;W[pc];B[pe];W[nc];B[ob]LB[nb:A][pb:B]C['A' or 'B' fail.
]
(;W[nb]LB[oe:A][pb:B]
C['A' takes some advantage in a safe way, 'B' destroyes everything, but depends on the ladder.
]
(;B[oe];W[nd];B[qc];W[pb];B[qb];W[oa];B[rd])

(;B[pb];W[qc];B[qb];W[rb];B[nd];W[oe]LB[of:A][mc:B]
C['A' ladder, 'B' disaster.
]
(;B[of];W[ne];B[md];W[qa])

(;B[mc];W[of];B[pg];W[og];B[oh];W[md];B[ne];W[me];B[nf];W[ng];B[mf];
W[mg];B[lf];W[mb];B[lg];W[ni];B[lc];W[qa])
)
)

(;W[pb];B[nd];W[oe];B[nb];W[mc];B[mb];W[lc];B[lb];W[kc];B[nf];W[ne];
B[me];W[md];B[of];W[nd];B[qc];W[qb];B[rc];W[rb];B[rd];W[sb];B[sc];
W[kb];B[pa])
)
)

(;B[nd];W[oe];B[pc];W[qe];B[qc];W[qi]
C[Now the triangled stone is a peep against a bamboo - questionable
shape.]
TR[pf])
)

(;W[tt]
C[If simplicity is the only goal, White may play elsewhere. White
lives in the corner, giving Black considerable thickness.]
;B[pd]C[White continues with 'a *'. White 'b' is a mistake.]
LB[qc:b][qe:a]
(;W[qe]C[Black continues with 'a *'. Black 'b' is too mild.]
LB[qc:b][qf:a]
(;B[qf];W[pe];B[oe];W[pb];B[ob]
C[White continues with 'a *'. White 'b' is a timing mistake.]
LB[pc:b][rf:a]
(;W[rf];B[rg];W[re];B[of]
C[White continues with 'A *' or 'B'. White plays elsewhere 'C'
at considerable cost.]
LB[dp:C][qh:B][pc:A]
(;W[pc];B[od];W[oa]C[
* GOOD VARIATION *])

(;W[qh];B[qg];W[pc];B[od];W[oa])

(;W[tt]
C[White plays elsewhere at heavy cost (though not a fatal mistake).];
B[qb]C['A' is correct, 'B' is a mistake.]LB[pc:B][rb:A]
(;W[rb]C['A' is correct, 'B' is a mistake.]LB[ra:B][qc:A]
(;B[qc];W[rc];B[ra];W[sd];B[sf];W[sb])

(;B[ra];W[qc];B[pa])
)

(;W[pc];B[pa];W[od];B[nd])
)
)

(;W[pc]C[White 11 is a mistake.];B[od];W[rb]
C[White must defend at 13 to live in the corner.];B[rf];W[rd]
C[White must respond to Black 14.])
)

(;B[qc]C[Black 6 is too mild.];W[rc];B[qb];W[qf];B[pg];W[qg];B[ph];
W[qi])
)

(;W[qc]C[White 5 is a mistake.];B[qe]C[Black 6 gives good shape.];
W[ob];B[nb];W[pb];B[mc];W[rb]
C[Black gets an extremely favorable result.])
)
)

(;B[ph]
C[
Sangen Takabasami = Sekan Gaojia = San Gaojia = 3-Space High Pincer
--------------------------------------------------------------------

Black 3 is not an effective pincer locally, but may be strategically
sensible.
'A' is correct, 'B' is questionable.
]
LB[qf:B][od:A]
(;W[od];B[nd];W[oe];B[pc];W[qc];B[ne];W[nf];B[of]C['A' or 'B'.]
LB[pd:B][qf:A]
(;W[qf];B[pf];W[qe];B[nh];W[mf];B[lc])

(;W[pd];B[lc];W[mf];B[pf];W[rf])
)

(;W[qf]C[Black continues with 'a'. Black 'b' is slack.]LB[of:b][qc:a]
(;B[qc];W[rc];B[pd];W[qb];B[qe];W[pc];B[rd];W[qc];B[pe]
C['A' gives a wall to the right, 'B' to the top side and center.]
LB[re:B][nc:A]
(;W[nc];B[od];W[ob];B[nd];W[mc];B[le])

(;W[re];B[rf];W[sd];B[pf]C[End of joseki.];W[qg]
C[That just helps Black.];B[rg];W[qh];B[qi];W[rh];B[ri];W[sf];B[pg];
W[sg])
)

(;B[of]C[Black 5 is slack.];W[od];B[nd];W[pc];B[ob])
)
)

(;B[lc]
C[
Nikken Biraki = Dukan Peollim = Chai E`r = 2-Space Extension
-------------------------------------------------------------

too narrow
]
;W[pc];B[od];W[qf]C[Black overconcentrated.])
)

(;W[pe]
C[
Takamoku Kakari
-------------------

White prevents Black from gaining influence, but in the local
context, abandoning profit in the corner entails a loss.

Black 'a *' and 'b *' are best. Black 'c *' emphasizes the right
side. Black 'd *' emphasizes influence over the top side. Black
'e *' emphasizes territory.
'f' is not recommended.

e5, d4, c 3, b2, a1
]
LB[qc:e][oe:d][qg:c][pd:b][qd:a][qh:f]
(;B[qd]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

Black 3 secures the corner. In the local context Black is satisfied.

White continues with 'a *'. White 'b' is a vulgar mistake.
]
LB[pd:b][qe:a]
(;W[qe]
C[White 4 is absolutely necessary.

Black continues with 'a *' or 'b *'.]
LB[pd:b][rd:a]
(;B[rd]
C[White continues with 'a *' to 'c *', 'd *'. White 'e' and 'f'
are not recommended.

e5, d4, c3, b2, a1]
LB[od:f][nd:e][me:d][ne:c][qj:b][qi:a]
(;W[qi]C[Black plays at 'a *' or elsewhere ('b').]LB[dp:b][nd:a]
(;B[nd]
C[
* GOOD VARIATION *

Black 'a' after the joseki is not recommended.]
LB[qg:a];W[tt]C[White plays elsewhere.];B[qg]
C[Black 8 is not an effective invasion.];W[pg]
C[Black may try 'a' or 'b'.]LB[re:b][qh:a]
(;B[qh];W[ph];B[ri];W[rj];B[qj];W[pi];B[rk];W[rh];B[sj];W[rg])

(;B[re]C[White continues with 'a'. White 'b' is a mistake.]
LB[rf:b][rg:a]
(;W[rg];B[qf];W[rf];B[qh];W[ph];B[rh];W[ri];B[sf];W[pf];B[sg];W[oj])

(;W[rf]C[White 11 is a mistake.];B[rg]
C[Black can connect however White plays.])
)
)

(;B[tt]
C[Black plays elsewhere. White presses with 'a' or 'b'. White 'c'
is also possible. White 'd' is unreasonable.]
LB[mc:d][re:c][md:b][nd:a]
(;W[nd];B[od];W[oe]
C[Black continues with 'a'. Black 'b' is an overplay.]LB[ne:b][re:a]
(;B[re];W[qg];B[mb])

(;B[ne]C[Black 10 is needlessly aggressive.];W[ld]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[md:b][nf:a]
(;B[nf];W[nc];B[re];W[qg]
C[Black gets the worst of it. Taking care of the two Black center
stones will be a burden.])

(;B[md]C[Black 12 is obvious, and a mistake.];W[me];B[nc];W[nf]
C[White squeezes.])
)
)

(;W[md]C[keima kikashi (knight forcing move)];B[nc];W[ne];B[lc])

(;W[re]
C[Black 'a' is essential. Black cannot afford to play elsewhere
('b').]
LB[dp:b][nd:a]
(;B[nd]C[Black 8 is essential.])

(;B[tt]C[Black plays elsewhere, a mistake.];W[pc];B[pd];W[od];B[pb];
W[nc];B[ob];W[nb]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[nd:b][rb:a]
(;B[rb]C[Black makes eye shape.];W[nd])

(;B[nd]C[Black 17 is not recommended.];W[oe];B[rb];W[md];B[ne];W[mf];
B[nf];W[ng]C[Black cannot escape.])
)
)

(;W[mc]
C[Locally, White 7 is unreasonable, though it may be helpful toward
the upper left.]
;B[nc];W[md];B[oe];W[pg];B[ne])
)
)

(;W[qj];B[nd]
C[White continues with 'a'. White 'b' is not recommended.]
LB[ne:b][ph:a]
(;W[ph])

(;W[ne]C[White 8 is not recommended.];B[me];W[mf]
C[Black continues with 'a'. Black 'b' is too mild.]LB[le:b][oe:a]
(;B[oe]C[White continues with 'a'. White 'b' is a mistake.]
LB[nf:b][of:a]
(;W[of];B[nf];W[ng];B[ne];W[og];B[lf];W[mg])

(;W[nf]C[White 12 is a mistake.];B[of];W[pd];B[pc]
C[White continues with 'a'. White 'b' is a mistake.]LB[od:b][md:a]
(;W[md];W[md];B[od];W[le];B[qh]
C[Black captures the three White stones and gets a very favorable
result.])

(;W[od]C[White 16 is a mistake.];B[pg]
C[Black captures White's four stones.])
)
)

(;B[le]C[Black 11 is too mild.];W[oe];B[mc])
)
)

(;W[ne]C['A *' is joseki, 'B' is a mistake.]LB[md:B][od:A]
(;B[od];W[oe]
C[Black continues with 'a *'. Black 'b' is a mistake in order.]
LB[md:b][re:a]
(;B[re];W[qg]C['A *' or 'B'.]LB[lc:B][md:A]
(;B[md]C[
* GOOD VARIATION *])

(;B[lc])
)

(;B[md]C[Black 9 is a mistake in order of play.];W[pd];B[pc];W[qc]
C[Answering White 12 is a problem for Black. 

Black continues with 'a'. Black 'b' makes White 'c' sente, giving
White excellent thickness.]
LB[re:c][qb:b][rc:a]
(;B[rc];W[qb];B[rb];W[nd];B[nc];W[mc];B[lc];W[mb];B[pb];W[kc]
C[Black has poor prospects in the fighting ahead.])

(;B[qb]C[Black 13 is not recommended.];W[re];B[rc];W[pj])
)
)

(;B[md]C[Black 7 is a mistake.];W[pc];B[pd];W[od];B[nd];W[oe]
C['A' or 'B'.]LB[ob:B][pb:A]
(;B[pb];W[nc];B[ob];W[le];B[ld];W[kd];B[kc];W[me];B[jd];W[ke];B[lc]
C[White gains magnificent thickness in sente.])

(;B[ob];W[re]
C[
Black plays 'A'. 'B' is a minor mistake. Not playing in the corner,
e.g. 'C', is a big mistake.]
PL[2]LB[pj:C][qb:B][qc:A]
(;B[qc];W[pj])

(;B[qb];W[rc])

(;B[pj];W[qb];B[qc];W[sd];B[pb];W[rc];B[pc];W[rb])
)
)
)

(;W[me]C[Black continues with 'a *' or 'b'.]LB[ne:b][mc:a]
(;B[mc];W[pj]C[
* GOOD VARIATION *])

(;B[ne];W[nf];B[nd];W[mf]
C[Black continues with 'a'. Black 'b' is an overplay.]LB[of:b][ld:a]
(;B[ld];W[md];B[mc];W[oe];B[pd])

(;B[of]C[Black 11 is unreasonable.];W[oe];B[og];W[qg];B[pd];W[ph];
B[oh];W[oi])
)
)

(;W[nd]C[White 6 is an overplay.];B[od];W[oe];B[ne];W[ld];B[nf];W[nc];
B[re];W[qg];B[lf])

(;W[od]C[White 6 is ineffective; a bad play.];B[nc]
C[White continues with 'a'. White 'b' is hopeless.]LB[pc:b][re:a]
(;W[re];B[pd]C[It is obvious that White 6 served no good purpose.];
W[qi])

(;W[pc]C[White 8 is a costly mistake.];B[pd];W[qc];B[rc];W[rb];B[ob];
W[qb];B[re];W[rf]C[White 16 is the cap to this unreasonble sequence.];
B[qf]C[White cannot possibly save the situation.])
)
)

(;B[pd]
C[White 'a *' is the traditional continuation, but 'b' is also
playable.]
LB[nd:b][oe:a]
(;W[oe]C[Black continues with 'a *' or 'b'.]LB[pi:b][nd:a]
(;B[nd]
C[White continues with 'a *'. White 'b' is too far an extension.]
LB[qj:b][qi:a]
(;W[qi]C[
* GOOD VARIATION *

A is now a big continuation for both.]
LB[mf:A])

(;W[qj]
C[White 8 is too far an extension. This shows the value of the
proverb: "from a wall of two, extend three" and so on.]
;B[mf]C[Now Black threatens an invasion...];W[pg]
C[...which White must defend, making White 8 a bad move.])
)

(;B[pi]C[White continues with 'a' or 'b'.]LB[md:b][nc:a]
(;W[nc]C[Black continues with 'a'. Black 'b' is weak.]LB[nb:b][od:a]
(;B[od];W[nd];B[ne]
C[White continues with 'a'. White 'b' is a mistake.]LB[ob:b][rd:a]
(;W[rd];B[rc];W[re]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[nb:b][qb:a]
(;B[qb];W[nb];B[ob];W[ld];B[nf];W[og])

(;B[nb]
C[Black 15 is not recommended.

White continues with 'a'. White 'b' is a mistake.]
LB[mb:b][lc:a]
(;W[lc]
C[Black must play 'a' to live in the corner. Black 'b' is unreasonable.]
LB[nf:b][qb:a]
(;B[qb];W[nf];B[me];W[ld]
C[White's prospects are good in the fight ahead.])

(;B[nf]C[Black 17 is a mistake.];W[qc];B[pb];W[rb];B[ld];W[mb];B[kc];
W[na];B[ob];W[kb])
)

(;W[mb]C[White 16 is a mistake.];B[ob];W[lc];B[me]
C[White may try 'a' or 'b'.]LB[og:b][ld:a]
(;W[ld];B[of]C[White will struggle to have his 5 stones live.])

(;W[og];B[ld];W[mc];B[jc]C[White may try 'a' or 'b'. Neither work.]
LB[kd:b][kc:a]
(;W[kc];B[jd])

(;W[kd];B[ke];W[jd];B[kc];W[ic];B[ib])
)
)
)
)

(;W[ob]C[White 12 is a mistake.];B[pb];W[nb];B[re];W[rf];B[rd];W[pg];
B[me];W[kc];B[kd];W[jc];B[nh]
C[Black builds thickness if White struggles to live on the right.])
)

(;B[nb]C[Black 9 is submisive.];W[od];B[pb];W[mc];B[mb];W[lc])
)

(;W[md]
C[Black continues with 'a'. If Black has the ladder to the lower
left, Black may play 'b'. Black 'c' is a mistake.]
LB[nd:c][ne:b][mb:a]
(;B[mb])

(;B[ne]C[Black must have the ladder to play this way.];W[nd];B[od];
W[re];B[rd];W[og];B[nf];W[ng];B[le];W[ld];B[ke];W[jc])

(;B[nd]C[Black 9 is a mistake.];W[ne];B[me];W[ld];B[mf];W[rd];B[rc];
W[qc]C[Black may try 'a' or 'b'.]LB[od:b][pc:a];B[pc];W[nc]
C[Black continues with 'a'. Black 'b' only makes matters worse.]
LB[od:b][re:a]
(;B[re];W[od];B[rf])

(;B[od]C[Black 19 is a mistake.];W[qb];B[re];W[ob];B[sd];W[pb];B[rd];
W[qg];B[rf];W[oh];B[rg];W[qh])
)
)
)
)

(;W[nd]C[Black continues with 'a' or 'b'.]LB[od:b][oe:a]
(;B[oe]C[Black 7 appeared in a professional game in 1956.];W[od];B[of]
;W[qg];B[pg];W[rd];B[rc];W[rf];B[sd];W[re];B[nc];W[md];B[mc];W[ld];
B[lc];W[kd];B[qh];W[rh];B[qi];W[ri];B[qj];W[pf];B[oh];W[kc])

(;B[od];W[oe];B[ne]
C[White continues with 'a'. White 'b' is not recommended.]
LB[nc:b][md:a]
(;W[md];B[nf];W[ph];B[jd])

(;W[nc];B[me];W[lc];B[re]C[Black secures the corner.];W[rf];B[rd];
W[pg];B[ld]C[Black takes advantage of White's bad shape.])
)
)
)
)

(;W[pd]
C[White 4 is an incredibly vulgar mistake, allowing Black to solidfy
corner profit with no compensation.]
;B[pc];W[qe];B[rd];W[qi]C[The threat of Black 'a' is real.]LB[qg:a])
)

(;B[pd]
C[
Kosumi-Tsuke = Diagonal Attachment
---------------------------------------

Black 3 looks strange but can be quite practical.
White continues at 'a *' or 'b *'.
]
LB[qe:b][oe:a]
(;W[oe];B[qe];W[qf];B[qd]C[White continues with 'a *' or 'b *'.]
LB[rf:b][pg:a]
(;W[pg]C[
* GOOD VARIATION *];B[tt]
C[Black plays elsewhere.

White continues locally with 'a'. White 'b' is unreasonable.]
LB[nc:b][md:a]
(;W[md])

(;W[nc]C[White 9 is unreasonable.];B[nb];W[od];B[mc];W[pc]
C[White 13 is unreasonable.];B[ob]C[White has not good follow-up.])
)

(;W[rf];B[nd]
(;W[og]
C[
* GOOD VARIATION *

White 10 is proper as Black 'a' would spoil White's shape.]
LB[pg:a])

(;W[tt]
C[White plays elsewhere.

Black continues locally with the peep at 'a'. The cut at 'b'
is not recommended.]
LB[pf:b][pg:a]
(;B[pg];W[pf]C[Now Black can figure out how best to continue.])

(;B[pf]C[Black 10 is not recommended.];W[og]
C[White settles by sacrificing the two stones.];B[pg];W[ph];B[qg];
W[qh];B[rg];W[rh];B[re];W[of];B[sf];W[ni])
)
)
)

(;W[qe];B[oe]C[White continues with 'a *' or 'b'.]LB[of:b][qd:a]
(;W[qd]C[Black continues with 'a *' or 'b'.]LB[of:b][qc:a]
(;B[qc];W[rc];B[qb];W[of];B[ne];W[nf];B[me];W[qj]
C[
* GOOD VARIATION *])

(;B[of]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
LB[pb:c][qh:b][qc:a]
(;W[qc];B[jc])

(;W[qh]C[White 8 is a mistake.];B[qc];W[rc];B[rb];W[qb];B[pc];W[rd];
B[jc])

(;W[pb];B[qc];W[pc];B[od];W[qb];B[rc];W[rb];B[rf]
C[White continues with 'a'. Playing elsewhere ('b') is a mistake.
Playing 'c' is submissive, but may be okay depending on the right
side.]
LB[rd:c][dp:b][pg:a]
(;W[pg]
C[White plays 16 to introduce some complication into the situation.];
B[pf];W[qf];B[qg];W[qh];B[rg];W[rd];B[qi])

(;W[tt]C[White plays elsewhere, a mistake.];B[rd];W[re];B[pf])

(;W[rd]C[Black 16 is submissive.])
)
)
)

(;W[of];B[qd];W[ne];B[od];W[nf];B[pf]
C[White continues with 'a' or 'b'.]LB[re:b][pg:a]
(;W[pg];B[qf];W[re]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[qg:b][rg:a]
(;B[rg];W[qg];B[rf];W[rh];B[rd];W[qi])

(;B[qg]C[Black 15 is vulgur.];W[qh];B[ph];W[rg];B[og];W[rf];B[pg];
W[qi])
)

(;W[re]
C[White 12 is a move of strong resistance.

Black continues with 'a', possibly 'b'.]
LB[qf:b][pg:a]
(;B[pg];W[qh]C[The fighting prospects from here are equal.])

(;B[qf];W[rg]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[rf:b][qh:a]
(;B[qh];W[qg];B[pg];W[ph];B[og];W[rf];B[pi];W[oh];B[ng];W[qi];B[mf])

(;B[rf]C[Black 15 is a mistake.];W[pg])
)
)
)
)
)

(;B[qg]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

Black 3 is somewhat an exception. White continues with 'a *'
to revert to joseki. White 'b' is also possible, but there is
trick play potential.
'c' is also possible.
]
LB[nd:c][qc:b][qd:a]
(;W[qd]
C[
* GOOD VARIATION *

This gives the same result as when White plays 5 before 2.]
LB[pe:2][qd:4])

(;W[qc]
C['A' is mild and easy, 'B' leads to several more difficult variations.
'C' is a mistake.]
LB[qd:C][pd:B][lc:A]
(;B[lc];W[rf])

(;B[pd]C[White continues with 'a'. White 'b' is a mistake.]
LB[qd:b][qe:a]
(;W[qe]
C[Black continues with 'a'; White takes the corner, Black outside.
Black 'b' is not as favorable.]
LB[qd:b][oe:a]
(;B[oe]C[White continues with 'A'.
'B' will be cut and running.]
LB[of:B][pf:A]
(;W[pf];B[qd];W[rd]C[Black 'a' is better than 'b'.]LB[rc:b][re:a]
(;B[re];W[rf];B[rc];W[se];B[qb])

(;B[rc];W[rb];B[re];W[sc];B[rf];W[of];B[ne];W[nf];B[me];W[mf];B[le];
W[pi]
C[White can aim for 'a' and 'b' in the endgame, in which case the
corner is worth 7 points.]
LB[pb:b][pc:a])
)

(;W[of];B[pf];W[ne];B[od];W[qd]C['A' is correct, 'B' is possible.]
LB[md:B][og:A]
(;B[og];W[nf];B[lc];W[ng]C[The fight continues on equal footing.])

(;B[md];W[og];B[qi]C[
The aji of the cut of A is not nice for Black.]
LB[nd:A];W[nd];B[nc];W[mc];B[lc];W[mb];B[lb])
)
)

(;B[qd];W[rd];B[oe];W[of]
C[Black continues with 'a' for center orientation or 'b' to take
the corner.]
LB[rc:b][pf:a]
(;B[pf]C[Black emphasizes thickness.
'A' or 'B'.]LB[ne:B][rf:A]
(;W[rf];B[og];W[nf];B[ng];W[mf];B[qb];W[pc];B[od];W[pb];B[ob];W[rb];
B[ld];W[mg])

(;W[ne];B[od];W[rf]
C[White is not bad off. Whatever happens next depends on fighting
strength.])
)

(;B[rc]C[Black takes the corner.];W[re];B[qb];W[ne];B[od];W[pg];B[nf];
W[me])
)
)

(;W[qd]C[White 6 is a mistake.];B[qe]
C[White 'a' is bad enough. White 'b' is worse.]LB[re:b][oe:a]
(;W[oe];B[re]
C[White 'a' and the White corner stones die. White 'b' and the
two White stones on the outside are left weak.]
LB[ob:b][nc:a]
(;W[nc];B[pc];W[qb];B[nb];W[mc];B[mb];W[lc];B[lb]
C['A' is correct. After White 'B' Black may just sacrifice three
stones.]
LB[od:B][kc:A]
(;W[kc];B[kb];W[jc]
C[Black pushing on the second line is good for White, although
the result as a whole is still good for Black.]
;B[rd])

(;W[od];B[pb];W[pa];B[ob];W[kb];B[rd];W[rc];B[ra])
)

(;W[ob]
C['A' gives White a secure corner which is shut in and an unsettled
center group,
'B' is a mistake and gives White good shape..]
LB[nb:B][od:A]
(;B[od];W[nb];B[ne];W[og];B[mc];W[rb];B[mb])

(;B[nb];W[nc];B[nd];W[od];B[mc];W[pc])
)
)

(;W[re];B[qf];W[ob];B[nb];W[pb];B[nc])
)
)

(;B[qd];W[pd];B[pc];W[qe])
)

(;W[nd];B[nc];W[md];B[lc];W[pj])
)

(;B[oe]
C[
Tobi-Tsuke (jump-attach)
---------------------------

Black 3 only makes sense, if Black can build a moyo on the top
side which is bigger than the corner or right side.

White may respond with 'a *' or 'b *'.
'c' is inferior.
]
LB[pd:c][of:b][od:a]
(;W[od]C[Black continues with 'a *' or 'b'.]LB[pd:b][nd:a]
(;B[nd];W[pd];B[pc];W[qc]
C[Black continues with 'a *'. Black 'b' is an overplay.]LB[qb:b][mc:a]
(;B[mc];W[of];B[ne];W[rd]C[
* GOOD VARIATION *])

(;B[qb]
C[Black 9 is not recommended, as White gets a favorable result.];W[rd]
C[Black may try 'a' or 'b'.]LB[rb:b][rc:a]
(;B[rc];W[qd]C['A' is correct, 'B' is a mistake.]LB[rb:B][mc:A]
(;B[mc];W[of];B[ne];W[rb];B[ra];W[sc]
C[White need not worry now about the cutting point below White
14.]
MA[pf])

(;B[rb];W[nc];B[nb];W[mc];B[ne];W[mb];B[ob];W[pg])
)

(;B[rb]
C[Black 11 show determination, but leads to a tough position for
Black.]
;W[nc];B[nb];W[mc];B[mb]C['A' or 'B'.]LB[ne:B][lc:A]
(;W[lc];B[ne];W[pg];B[le];W[jc]
C[Black's stones in the center are floating. White faces favorable
prospects by making profit by threatening the Black center stones.])

(;W[ne];B[md];W[of];B[lc])
)
)
)

(;B[pd];W[nd]
C[Black continues with 'a'. Black 'b' to 'd' are not recommended.]
LB[pf:d][nc:c][qd:b][pc:a]
(;B[pc]
C[White continues with 'a' or 'b'. White must have the ladder to
play 'a'.]
LB[qe:b][of:a]
(;W[of]C[White must have the ladder to play 8.];B[qe];W[ne];B[qf];
W[nc])

(;W[qe];B[of];W[nc]C[Black continues with 'a' or 'b'.]LB[qg:b][rc:a]
(;B[rc];W[qh];B[kd];W[le])

(;B[qg];W[rc];B[rb];W[rg]C['A' is correct, 'B' is a mistake.]
LB[rh:B][qh:A]
(;B[qh];W[rd];B[nb];W[mb];B[oa];W[ld];B[sb];W[rh];B[ri];W[qf];B[qi];
W[sf];B[oh];W[ic])

(;B[rh];W[re]C[Neither 'A' nor 'B' work.]LB[qb:B][qh:A]
(;B[qh];W[qb])

(;B[qb];W[qh])
)
)
)
)

(;B[qd]C[Black 7 may look like good shape, but is a slack move here.];
W[nc]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[pb:b][pf:a]
(;B[pf];W[ne];B[of];W[pc];B[qc];W[ob])

(;B[pb]C[Black 9 is not recommended.];W[ob];B[pc];W[pf];B[ne];W[ld];
B[me];W[kd])
)

(;B[nc]
C[Black 7 looks tough, but Black faces difficulties.
'A' is correct, 'B' is a mistake.]
LB[md:B][of:A]
(;W[of];B[ne];W[md];B[me]
C[White continues with 'a'. White 'b' is not recommended.]
LB[le:b][qd:a]
(;W[qd];B[pc];W[ld]C[Black may try 'a' or 'b'.]LB[qc:b][qe:a]
(;B[qe];W[pf];B[re];W[lf]
C[The three Black stones are captured, a success for White.])

(;B[qc];W[pf]
C[Black must decide what to do about the three stones in the center.
White has favorable propects.])
)

(;W[le]C[White 12 is not recommended.];B[ng];W[pc];B[qd];W[qc];B[rc];
W[rd];B[qe];W[rb];B[ld];W[mc];B[lc];W[mb];B[lb];W[ob];B[pf]
C[Black's thickness is better than White's corner profit.])
)

(;W[md];B[qd];W[of];B[qe];W[ne];B[pg])
)

(;B[pf];W[qe];B[qd];W[qf];B[of];W[nc];B[pb];W[ob];B[pc];W[qh])
)
)

(;W[of]
C[Black continues with 'a *' or 'b *'. Black must have the ladder
to play 'b'.]
LB[pf:b][ne:a]
(;B[ne];W[pd]C['A *' is joseki, 'B' is ok.]LB[pc:B][pf:A]
(;B[pf]
C[White continues with 'a *'. White 'b' is bad timing. Black 'c'
is unreasonable.]
LB[pg:c][pc:b][qf:a]
(;W[qf]C[White plays 8 to take the corner.];B[pg];W[qg];B[ph];W[qh];
B[pi]
C[White continues with 'a *'. White 'b', hoping to cut off Black
1 next, is unreasonable.]
LB[qi:b][pc:a]
(;W[pc]
C[Black continues with 'a' for the right, 'b *' for the top side.]
LB[ob:b][qi:a]
(;B[qi];W[nb]
C[White 16 is a tesuji - if Black 'a', White 'b' is good.]
LB[od:b][ob:a])

(;B[ob];W[qj];B[ic]C[
* GOOD VARIATION *])
)

(;W[qi];B[pj];W[od];B[nd];W[nc];B[mc];W[nb];B[ob];W[mb];B[qc]
C[White plays 'a' and give Black magnificant thickness. White plays
'b' and Black lives in the corner.]
LB[lc:b][rd:a]
(;W[rd];B[lc];W[lb];B[kc];W[rc];B[kb];W[pc];B[qj]
C[Black has beautiful thickness.])

(;W[lc];B[rd];W[re];B[qj];W[rj];B[rk];W[si];B[le];W[ic]
C[Black plays 'a' to live comfortably in the corner. Not playing
'a', such as playing elsewhere ('b'), jeopordizes the corner.]
LB[dp:b][se:a]
(;B[se];W[sf];B[sd];W[rg]C[White ends in gote.])

(;B[tt]C[Black plays elsewhere. Not recommended, but not fatal.];W[md]
;B[me];W[rb]C[The placement of White 35 is the tesuji.];B[qb];W[oa];
B[pa];W[rc];B[qd];W[qe];B[ra]
C[Black has to capture the two White stones...];W[pc]
C[...allowing White to capture two Black stones ('a'). White cannot
connect at 'b'.]
LB[pb:b][sb:a]
(;B[sb];W[pb])

(;B[pb]C[Black cannot connect.];W[sd]C[Atari, and the game is over.])
)
)
)
)

(;W[pc]
C[White 8 is not recommended.

Black continues with 'a', or, with a favorable ladder, 'b'.]
LB[og:b][qf:a]
(;B[qf];W[og];B[ph];W[nb];B[mf];W[oh];B[pi];W[nc];B[mh])

(;B[og]C[Black plays 3 with a favorable ladder.];W[qf];B[nf];W[qg];
B[ob])
)

(;W[pg]
C[White 8 is unreasonable. White cannot capture the Black stone.];
B[qf];W[qg];B[re]
C[Black 11 is a standard tesuji enabling him to capture the two
White stones.]
;W[rg];B[rd]C[White may try 'a' or 'b'. Neither work.]LB[qc:b][pc:a]
(;W[pc];B[qb];W[pb];B[rb];W[nc]C[If White tries 18...];B[mc]
C[... Black keeps the situation in check with 19.])

(;W[qc];B[pc];W[qd];B[rc]C[White may try 'a' or 'b'. Neither work.]
LB[qb:b][rb:a]
(;W[rb];B[qb]C[Black 19 starts a common squeeze tesuji.];W[pb];B[qa];
W[pa];B[qe];W[ra];B[qb];W[qa];B[od];W[qb];B[sb]C[White has lost.])

(;W[qb];B[rb])
)
)
)

(;B[pc]C['A' for the center, 'B' for the corner.]LB[qc:B][pi:A]
(;W[pi];B[dp]C[Possible White continuation later.];W[qc]
C['A' is ok, 'B' is possible.]LB[qb:B][mc:A]
(;B[mc];W[qb])

(;B[qb]
C[
If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.]
;W[od];B[nd];W[nc];B[mc];W[nb];B[qd];W[rc];B[pf];W[qe];B[qf];W[re];
B[mb]C['A' takes the right side, 'B' the corner.]LB[pb:B][og:A]
(;W[og];B[ob])

(;W[pb];B[og];W[rf];B[qh])
)
)

(;W[qc];B[pf])
)
)

(;B[pf]
C[Black must have the ladder to play 5. White continues with 'a
*' or 'b'. White 'c' results in a loss.]
LB[qd:c][od:b][qe:a]
(;W[qe]C[Black continues with 'a *' or 'b *'.]LB[qf:b][ne:a]
(;B[ne];W[pg];B[nf];W[og];B[qc];W[qj]C[
* GOOD VARIATION *])

(;B[qf]C[White continues with 'a *'. White 'b' is unreasonable.]
LB[od:b][rf:a]
(;W[rf]C['A *' is correct, 'B' is disadvantageous.]LB[rg:B][og:A]
(;B[og];W[nf]
C[There is a similar position starting with 1 instead of the marked stone, refererenced by the numbers.
]
TR[oc]LB[pc:1][qe:2][pf:3][pe:4][oe:5][of:6][qf:7][rf:8][og:9][nf:10];
B[ne]
C[With an unfavorable ladder, White must play 'a *'. But if the
ladder favors White, White plays 'b'.]
LB[qh:b][ng:a]
(;W[ng]C[White plays this way when the ladder is unfavorable.];B[rg];
W[re];B[qg]C[White continues with 'a *' or 'b'.]LB[oh:b][pb:a]
(;W[pb]C[Black continues with 'a *' or 'b'.]LB[nh:b][pc:a]
(;B[pc];W[qc];B[ob];W[oh]
C[Black continues with 'a *'. Black 'b' is a mistake.]LB[qb:b][qj:a]
(;B[qj];W[qb];B[le]C[
* GOOD VARIATION *])

(;B[qb]
C[Black cannot afford to play 21. Black loses the race to capture
by a move.]
;W[rb];B[pa];W[qi];B[ri];W[rj];B[rh];W[qk]
C[Black may try 'a' or 'b', but loses the race to capture.]
LB[rc:b][qd:a]
(;B[qd];W[rc])

(;B[rc];W[qh])
)
)

(;B[nh]C['A' or 'B'.]LB[lg:B][lf:A]
(;W[lf];B[pc];W[qc];B[ob];W[qb];B[ld];W[lh];B[oi])

(;W[lg];B[oi];W[ob];B[me];W[lf];B[kd])
)
)

(;W[oh];B[qc];W[qi];B[ri];W[rj];B[rh];W[qk];B[rd];W[me])
)

(;W[qh]
C[White plays 12 if the ladder to capture the two White center
stones does not work for Black.]
;B[pg];W[rd];B[oi];W[mf];B[ld];W[qj]C[White has favorable position.])
)

(;B[rg];W[re];B[ph];W[od];B[ne];W[nd];B[md];W[me];B[nf];W[nc];B[mc];
W[pc];B[og];W[le];B[kc];W[kd];B[lb];W[jc];B[jb];W[ic];B[ib];W[hc])
)

(;W[od]C[White 8 is unreasonable.];B[ne];W[nd];B[pd];W[qd];B[pc];W[md]
;B[me];W[qc];B[qb];W[rb]
C[Black plays simply with 'a', or tenaciously with 'b'.]LB[ob:b][ld:a]
(;B[ld];W[nb];B[og];W[lb];B[re];W[rd];B[sd];W[rc];B[rg]
C[White has to add a corner move, such as 'a'. Playing elsewhere
risks a ko.]
LB[dp:b][pb:a]
(;W[pb])

(;W[tt]
C[White plays elsewhere. Black gets a flower-viewing ko (a ko where
Black has nothing to lose).]
;B[ra];W[pb];B[sb])
)

(;B[ob]C[Black 19 is tough-minded, going for a big ko fight.];W[le];
B[og];W[qa];B[pa];W[pb];B[ld];W[lc];B[kd];W[mc];B[qb];W[ra];B[kc];
W[pb]C[The fight continues...])
)
)
)

(;W[od]C[White 6 is vulgar, but playable.];B[ne];W[pd];B[nd]
C[White continues with 'a'. White 'b' is also playable if White
does not mind giving Black good outside influence.]
LB[pc:b][nc:a]
(;W[nc]C[Black continues with 'a' or 'b'.]LB[mc:b][pc:a]
(;B[pc];W[qc];B[qb];W[rd];B[nb];W[mc]
C['A' gives an equal result, 'B' is disadvantageous.]LB[mb:A][rb:B]
(;B[mb]
C[If you are high-dan and know the follow-up. mail it to me please: 
kogo@waterfire.us.]
;W[lc];B[rb];W[qf];B[pg];W[qg];B[ph];W[qh];B[pi]
C[Same result as the variation refererenced by the numbers, look
there (flipped by the ascending diagonal line) for the continuation.]
LB[rb:25][lc:24][mb:23][mc:22][nb:21][rd:20][qb:19][nc:18][nd:17][od:16][pi:15][qh:14][ph:13][qg:12][pg:11][qf:10][pf:9][qc:8][oc:7][pd:6][ne:5][of:4][oe:3][pe:2][pc:1])

(;B[rb];W[qf];B[pg];W[qg];B[ph];W[qh];B[pi];W[mb];B[ob]
C[See variation 2-4-4-1-2-1-1-1-1-1 for continuation.])
)

(;B[mc];W[nb]
C[Black continues with the tough-minded move of 'a', or the simpler
'b'.]
LB[qf:b][ob:a]
(;B[ob];W[mb];B[qc];W[qf];B[pg];W[qg];B[ph]
C['A' is correct, if White wants to take less territory for giving
less influence than after 'B', 'B' is ok, 'C' is wrong.]
LB[rd:A][qh:B][lc:C]
(;W[rd];B[lc];W[lb];B[kc];W[rc];B[kb];W[pc];B[qh])

(;W[qh]
C[If you are high-dan and know the follow-up. mail it to me please: 
kogo@waterfire.us.]
;B[pi];W[qi];B[pj]
C[For continuation see the variation referenced by the numbers.]
LB[qc:23][mb:22][ob:21][nb:20][mc:19][nc:18][nd:17][od:16][pj:15][qi:14][pi:13][qh:12][ph:11][qg:10][pg:9][qf:8][pf:7][pd:6][ne:5][of:4][oe:3][pe:2][oc:1])

(;W[lc];B[rd];W[re];B[qh]C[White dies.])
)

(;B[qf];W[ob];B[og]
C[Black's ponnuki shape from capturing White 4 gives Black a very
favorable result.])
)
)

(;W[pc]
C[Locally, White 10 is not recommended, but is okay if the resulting
Black outside influence does not count for much.

Depending on the side of favor, Black continues with 'a' or 'b'.]
LB[nc:b][qf:a]
(;B[qf];W[nc];B[mc];W[ob];B[og];W[mb]
C[Black continues with 'a' or 'b'.]LB[nf:b][lc:a]
(;B[lc])

(;B[nf])
)

(;B[nc]C[White continues with 'a'. White 'b' loses the game.]
LB[pg:b][qf:a]
(;W[qf];B[pg];W[qg];B[ph];W[qh];B[pi];W[qj];B[id])

(;W[pg];B[qf];W[qg];B[re];W[rg];B[qc];W[qb];B[pb];W[ob];B[pa];W[oa];
B[qd];W[qa];B[pb];W[pa];B[qe];W[pb];B[nf];W[og];B[rb];W[rc];B[sb];
W[mb];B[nb];W[na];B[lb];W[mc];B[lc];W[md];B[la];W[ma];B[le])
)
)
)

(;W[qd]C[White cannot get a favorable result.];B[ne]
C[White continues with 'a'. White 'b' and 'c' are no good.]
LB[og:c][pg:b][qf:a]
(;W[qf];B[pg];W[qg];B[ph];W[qh];B[pi];W[qj];B[ic])

(;W[pg];B[qf];W[qg];B[re]
C[White continues with 'a'. White 'b is a mistake.]LB[rd:b][rf:a]
(;W[rf];B[qe];W[rd];B[pd];W[se];B[pe];W[rh];B[qc])

(;W[rd]C[White 12 is a mistake.];B[rg]
C[White is at a loss, with too many cutting points to succeed.])
)

(;W[og];B[qf];W[pc];B[pb];W[qb];B[nb];W[pa];B[ob];W[rc];B[qi])
)
)
)

(;W[pd];B[od];W[pc];B[pf];W[qf];B[qg])
)

(;B[qc]C[
Sansan
-------

Black 3 is too low.
];W[qd]
C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[rd:b][rc:a]
(;B[rc]
C[White continues with 'a *' or 'b *'.

White 'c', attempting to press Black down before extending at
'a', is a mistake.]
LB[nd:c][ne:b][qi:a]
(;W[qi]
C[
* GOOD VARIATION *

Black continues with 'a'. Playing elsewhere ('b') is not recommended.]
LB[dp:b][oe:a]
(;B[oe];W[of];B[ne];W[pc];B[pb];W[pd];B[nb])

(;B[tt]C[Black plays elsewhere.];W[nd]
C[White presses.

Black continues with 'a'. White 'b' is unreasonably strong resistance.]
LB[od:b][nc:a]
(;B[nc];W[md];B[lc])

(;B[od]C[White 8 is unreasonable.];W[oe];B[ne];W[ld];B[nf];W[nc])
)
)

(;W[ne]C['A *' is joseki, 'B' is possible.]LB[qi:B][md:A]
(;B[md]
C['A *' is joseki, 'B' unneceassarily gives Black much territory.]
LB[me:B][qj:A]
(;W[qj]C[
* GOOD VARIATION *])

(;W[me];B[ld];W[le];B[kd];W[qk];B[jf])
)

(;B[qi];W[nc];B[nb];W[od];B[pc];W[mc];B[mb];W[lc])
)

(;W[nd]C[White 6 is a mistake.
'A' is correct, 'B' is too submissive.]
LB[nc:B][od:A]
(;B[od];W[oe];B[ne];W[ld]C['A' or 'B'.]LB[nf:B][me:A]
(;B[me];W[nc];B[nb];W[mb];B[ob];W[kc];B[og];W[qg];B[pi])

(;B[nf];W[nc];B[nb];W[pg];B[mb];W[lc];B[lf])
)

(;B[nc];W[md];B[mc];W[ld])
)
)

(;B[rd]C[Black 5 is a coarse move.];W[re];B[pd];W[qe];B[oe];W[of];
B[ne];W[nf];B[me];W[rc];B[rb];W[sd])
)

(;B[qh]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

If you are high-dan and know the follow-up. mail it to me please: kogo@waterfire.us.
])
)

(;W[qc]
C[
San-san
--------

White goes for profit at the expense of influence. A ladder helps
White when playing 2.

Black replies with 'a *' to 'f'. Black must have the ladder
to sucessfully play 'b'.

e5, d4, c 3, b2, a1
]
LB[pf:f][qf:e][qe:d][pd:c][qd:b][pe:a]
(;B[pe]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

White continues with 'a *' or 'b *'. White 'c' is a mistake.
]
LB[ob:c][re:b][qe:a]
(;W[qe]C[Black continues with 'a *' or 'b *'.]LB[pf:b][qf:a]
(;B[qf]
C[White continues with 'a *', 'b *' or 'c'.

White 'a' emphasizes the corner, with aji from 'a'.
White 'a' may lead to complications.

White 'b' emphasizes the top.

White 'c' emphasizes the right.

White 'd' and 'e' are not recommended.]
LB[qd:e][re:d][pd:c][ob:b][pf:a]
(;W[pf]
C[Black 'a *' is the usual continuation.'b' is possible with the
ladder. Black 'c' was played by Hashimoto Utaro against Sakata
Eio in 1972.]
LB[pd:c][oe:b][qd:a]
(;B[qd];W[re]C[Black continues with 'a' or 'b *'.]LB[pd:b][oe:a]
(;B[oe];W[rd];B[pg])

(;B[pd];W[rd];B[qg];W[pc]
C[Joseki continues with 'a *'. Black 'b' is a mistake.]LB[ob:b][od:a]
(;B[od];W[of];B[pi];W[mf];B[ob];W[rb];B[ld]C[
* GOOD VARIATION *];
W[ni];B[pk])

(;B[ob]
C[Black 13 is a mistake discovered by Yoshio Ishida in 197 against
Iwata. Ishida called the move "complacent".

White continues with 'a' or 'b'. Black had expected 'b', but
got 'a'.]
LB[od:b][ph:a]
(;W[ph];B[qh];W[qi];B[pg];W[of];B[ne];W[og];B[ri];W[pi];B[rj];W[rf];
B[rh];W[rb];B[ql]C[Black 27 is questionable....];W[le]
C[... because White 28 is such a severe attack. Black faces a difficult
fight.])

(;W[od];B[oe]C[Black builds thickness while White takes the top.];
W[nd];B[ne];W[md];B[me];W[ld];B[le]
C[White continues with 'a'. White 'b' is a mistake.]LB[kd:b][mb:a]
(;W[mb];B[kd];W[kc];B[jc];W[kb];B[jd])

(;W[kd]C[White 22 is a mistake.];B[rc];W[rb];B[qb];W[sc];B[pb];W[rc];
B[mb];W[lb];B[ra])
)
)
)
)

(;B[oe];W[qg];B[rf];W[re];B[rg];W[qh];B[pg];W[of];B[ph];W[rh];B[nf])

(;B[pd]
C[White 'a' is the continuation of the game (Hashimoto v. Sakata,
1972). White 'b' also leads to an even exchange.]
LB[qg:b][qd:a]
(;W[qd];B[rf];W[of];B[qh]
C[White 'a' shows the game continuation. White 'b' strengthens
the black stones on the outside.]
LB[ob:b][nd:a]
(;W[nd];B[nc]
C[White continues with 'a' or 'b'. White 'a' keeps the corner alive,
while 'b' sacrifices the corner for thickness at top.]
LB[md:b][ld:a]
(;W[ld];B[lc];W[kc]
C[Black continues with 'a' or 'b'.

Black 'a' gets Black out to the center (White lives in the corner).
Black 'b' gets Black sealed in, but taking the taking the large
corner territory.]
LB[md:b][mc:a]
(;B[mc]
C[Black 17 gets black out to the center, but White lives in the
corner.]
;W[kd];B[re];W[pc];B[od];W[ob];B[ne];W[rd];B[nb];W[pa];B[md];W[oh];
B[ng];W[nf];B[mf];W[mg];B[lf];W[mh])

(;B[md]
C[Black 17 results in White sealing Black in, but Black takes the
corner.]
;W[me];B[mc];W[kd];B[ne];W[nf];B[pb];W[qb];B[re])
)

(;W[md]C[White 14 discards the corner for thickness.];B[mc];W[lc];
B[lb];W[kc];B[kb];W[jc];B[jb];W[ic])
)

(;W[ob];B[nb];W[pb];B[nd])
)

(;W[qg];B[rf];W[rg];B[of];W[pg];B[qd];W[re];B[rd];W[sf]
C[White still has aji in the corner.])
)
)

(;W[ob]C[Black continues with 'a' or 'b *'. Black 'c' is a mistake.]
LB[pc:c][qd:b][nb:a]
(;B[nb];W[nc];B[od]
C[White continues with 'a'. White 'b' is a mistake.]LB[pb:b][mb:a]
(;W[mb];B[pb];W[na];B[pc];W[nd];B[ne];W[me];B[nf]
C[The two White stones in the corner are not captured yet.];W[qb]
C[White can get a ko.];B[pa];W[re];B[rf]
C[White continues with 'a'. White 'b' is a mistake.]LB[sb:b][qd:a]
(;W[qd]C[White 22 is the best move.];B[qa];W[ra];B[rb];W[sb])

(;W[sb]C[White 22 is a mistake. White dies.];B[ra];W[qa];B[se]
C[Now White cannot make two eyes.])
)

(;W[pb]C[White 10 is a mistake.];B[mc];W[nd];B[lb]
C[White has to play 'a' to live in the corner. White cannot extend
with 'b'.]
LB[ne:b][re:a]
(;W[re]C[White has to play 14 to live.];B[me])

(;W[ne]C[White 14 is a mistake.];B[qd];W[re];B[rd];W[pd];B[pc];W[oe];
B[pd];W[rc];B[rf];W[ra];B[oa])
)
)

(;B[qd];W[pc];B[re];W[nc]C[
* GOOD VARIATION *])

(;B[pc]C[Black 7 is a mistake.];W[qd];B[pb];W[pf];B[pd];W[qg];B[rf];
W[rg];B[of];W[pg])
)

(;W[pd];B[od];W[rf];B[pf];W[rg];B[qb];W[rb];B[rd];W[qd];B[pb];W[rc])

(;W[re]C[White 6 is a heavy move, and not recommended.];B[pf];W[ob];
B[nb]C[White draws back at 'a'. White 'b' is a mistake.]LB[nc:b][pb:a]
(;W[pb];B[mc]
C[White has sente, but a small corner. Black's thickness is better.])

(;W[nc]C[White 10 is a mistake.];B[od];W[mb];B[pb];W[na];B[qb];W[nd];
B[ne];W[me];B[nf])
)

(;W[qd]C[White 6 is a heavy move, and not recommended.];B[pf];W[ob]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nb:b][nc:a]
(;B[nc];W[nb];B[pb];W[pc];B[mb];W[qb];B[mc])

(;B[nb]C[Black 9 is a mistake.];W[nc]
C[Black now lacks a good response.])
)
)

(;B[pf]C[White continues with 'a *' or 'b *'.]LB[ob:b][qf:a]
(;W[qf];B[pg]
C[If White has followed this line, it is correct to continue at
'a *'. White 'b' is a mistake in move order.]
LB[ob:b][qg:a]
(;W[qg];B[ph];W[jc]C[
* GOOD VARIATION *];B[qh])

(;W[ob]C[White 8 is a mistake in move order.];B[qd]
C[White continues with 'a'. White 'b' is a mistake.]LB[pd:b][rd:a]
(;W[rd];B[pd]
C[Black has now created the two marked cutting points. White is
in trouble.]
MA[rc][pb])

(;W[pd]C[White 10 is a mistake.];B[rd];W[pc];B[rc];W[od];B[qg])
)
)

(;W[ob]C[Black continues with 'a *'. Black 'b' and 'c' are mistake.]
LB[pb:c][nb:b][nc:a]
(;B[nc];W[qf];B[pg];W[nb];B[mc];W[pd];B[od];W[pc]
C[
* GOOD VARIATION *])

(;B[nb]C[Black 7 is a mistake.];W[nc];B[od];W[mb];B[pb];W[na];B[pc];
W[kd];B[qf]
C[The sequence ends in gote for Black.

White can get a ko in the corner with 'a'.]
LB[qb:a];W[qb];B[pa];W[re];B[rf];W[qd];B[qa];W[ra];B[rb];W[sb])

(;B[pb];W[pc];B[nb];W[od];B[nc];W[pd])
)
)
)

(;W[re]C[Black continues with 'a *' or 'b'. Black 'c' is an overplay.]
LB[rf:c][qf:b][qb:a]
(;B[qb]C[White continues with 'a *'. White 'b' is not good.]
LB[rb:b][pb:a]
(;W[pb];B[pc];W[rb];B[qd];W[rc];B[ob];W[qa];B[kd]
C[
* GOOD VARIATION *])

(;W[rb]
C[White 6 is not recommended: White is too low.

Black continues with 'a' or 'b'.]
LB[qd:b][pb:a]
(;B[pb];W[qg];B[kc])

(;B[qd]C[White continues with 'a'. White 'b' is not recommended.]
LB[pb:b][rd:a]
(;W[rd];B[pc];W[rc];B[kc])

(;W[pb]C[White 8 is not recommended.];B[pc];W[rc];B[ob];W[qa])
)
)
)

(;B[qf];W[rf];B[qg];W[ob];B[nb];W[pb];B[nc])

(;B[rf]C[Black 5 is an overplay.];W[qf];B[qe];W[rg];B[rd];W[sf];B[qd];
W[pf]C[Black 'a' is submissive, but Black 'b' leaves aji for White 2.]
LB[of:b][oe:a])
)

(;W[ob]C[White 'c' is a mistake.];B[nb]
C[White continues with 'a'. White 'b' is not recommended.]
LB[nc:b][pb:a]
(;W[pb];B[nc];W[re];B[rf]
C[Black 9 works here: White cannot afford to sacrifice the corner
stones now.

Compare this to the variation, where the exchanges of White 4,
Black 5, White 6, Black 7 have been omitted.]
LB[pb:6][ob:4][nb:5][nc:7];W[rd];B[qf]
C[Now Black has great thickness.])

(;W[nc]C[Black continues with 'a'. Black 'b' is slack.]LB[od:b][nd:a]
(;B[nd];W[mc];B[pb];W[od];B[pc];W[pd];B[qd];W[oe];B[of];W[ne];B[qe];
W[mb];B[oa])

(;B[od]C[Black 7 is a slack move.];W[mb];B[pb];W[na]
C[Now Black must confine White 2, while White gets a nice extension
on the side.]
;B[pc])
)
)
)

(;B[qd]
C[
Uezuke-Hiki = Attach on top to draw back
--------------------------------------------

Black must have the ladder to play this way.

White continues with 'a'. White 'b' is not recommended.
]
LB[pc:b][rd:a]
(;W[rd]C[Black continues with 'a' or 'b'.]LB[qe:b][pd:a]
(;B[pd]
C[White continues with 'a' or 'b'. White should play 'a' if the
ladder to the bottom left is favorable to White.

White 'b' does not involve a ladder.]
LB[re:b][qe:a]
(;W[qe]
C[Black continues with 'a' with a favorable ladder, or 'b' if the
ladder is unfavorable.]
LB[re:b][rc:a]
(;B[rc];W[rb];B[re];W[sc];B[qf])

(;B[re]
C[Black must play this way with an unfavorable ladder, though the
result favors White.]
;W[rf]C['A' or 'B'.]LB[pe:B][rc:A]
(;B[rc];W[se];B[qb]
C[Black's corner is small, and White's ponnuki shape powerful.
'A' or 'B'.]
LB[pe:B][qh:A]
(;W[qh])

(;W[pe])
)

(;B[pe]C['A' is correct, 'B' is a mistake.]LB[qf:B][se:A]
(;W[se];B[qf];W[qg];B[re];W[rh];B[pf];W[rb])

(;W[qf];B[rc];W[se];B[qb])
)
)
)

(;W[re];B[qb];W[rc];B[pc];W[pf];B[lc])
)

(;B[qe];W[pc];B[od];W[re];B[qg]
C[White continues with 'a'. White 'b' is not recommended.]
LB[pd:b][rf:a]
(;W[rf];B[og])

(;W[pd]C[White 10 is not recommended.];B[pe];W[oe];B[pg];W[ne];B[ob];
W[rb];B[lc]C[White faces a difficult fight.])
)
)

(;W[pc]C[White 4 is not recommended.];B[pd];W[ob];B[nc];W[nb];B[mc];
W[rd];B[re];W[rc];B[qf]C[Black's thickness is superior.])
)

(;B[pd]
C[
Kosumi = Ibkucha = Jian = Diagonal
-----------------------------------

Black 3 is playable only in this situation. This shape is a bit
vulgar, and so is not seen in other joseki. 
Black should have a favorable ladder to play this way.

White continues with 'a'. White 'b' and 'c' are mistakes.
]
LB[re:c][qd:b][qe:a]
(;W[qe]C[White 4 is the only good move.
'A' or 'B'.]LB[pf:B][qd:A]
(;B[qd];W[rd])

(;B[pf];W[qd];B[nf];W[qg])
)

(;W[qd]C[White 'b' is a mistake.];B[qe]
C[White must now submit to playing 'a'. A cut at 'b', starting
a fight, is unreasonable.]
LB[pe:b][re:a]
(;W[re];B[qf];W[rf];B[qg])

(;W[pe]C[White 6 is unreasonable without more support.];B[re]
C[Neither 'A' nor 'B' work.]LB[ob:B][oe:A]
(;W[oe];B[pc]
C[Black captures the corner stones.

Without support for White at the marked location, this fight
is unreasonable.]
CR[kd])

(;W[ob];B[nb];W[pb];B[nc];W[rb];B[qg])
)
)

(;W[re]C[White 4 is a mistake.];B[qe]
C[White continues with 'a'. White cannot play 'b'.]
LB[qf:c][rf:b][rd:a]
(;W[rd]C[White must back up to connect.];B[qf])

(;W[rf]C[White 6 is a mistake.];B[rd];W[qd];B[rc])

(;W[qf]C[Assuming Black has the ladder, White 6 is a mistake.];B[rd];
W[qd];B[pe]C[White continues with 'a'. White 'b' is a mistake.]
LB[rf:b][rc:a]
(;W[rc];B[rf];W[sd];B[qg])

(;W[rf]C[White 10 compounds the mistake.];B[rc]
C[White suffers a big loss.])
)
)
)

(;B[qe]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

As the 3-3 point is easily settled, there must be some strategic
advantage in attacking it with the pincer, namely, surrounding
support. By itself, the pincer is somewhat unreasonable.
]
;W[pd]C['A' is correct, 'B' is a trick play.]LB[oe:B][pf:A]
(;B[pf]C[White continues with 'a' or 'b'.]LB[pe:b][od:a]
(;W[od]
C[Black continues with 'a'. Black 'b' is only good with a stone
on or near the marked position.]
LB[nc:b][mc:a]TR[jd]
(;B[mc]C[White continues with 'a' or 'b'.]LB[nc:b][nd:a]
(;W[nd];B[nc];W[nf]
C[Pincers at 'a' and 'b' are miai for White, so Black should have
had support before initiating this pincer.

A Black placement at 'c' can deprive White of getting an eye
in the corner.]
LB[rb:c][pi:b][jc:a])

(;W[nc]C[warikomi (thrust in)];B[nd];W[nb];B[md];W[ob];B[nf])
)

(;AB[jd];B[nc]C['A' or 'B'.]LB[of:B][nd:A]
(;W[nd];B[md];W[me];B[ld];W[nf];B[pi])

(;W[of]C['A' or 'B'.]LB[ph:B][og:A]
(;B[og];W[pg]C[White A remains sente.]LB[nd:A])

(;B[ph];W[md])
)
)
)

(;W[pe]C['A' or 'B'.]LB[of:B][qf:A]
(;B[qf]C[White continues with 'a'. White 'b' is a mistake.]
LB[nd:b][ne:a]
(;W[ne];B[md];W[of];B[ph])

(;W[nd];B[nc];W[md];B[mc];W[ld];B[kc]
C[A Black jump to the marked location is sente, so White has not
really built thickness.]
CR[nf])
)

(;B[of];W[qf];B[qg];W[rf];B[rg];W[re])
)
)

(;B[oe];W[pe];B[pf];W[od];B[nd]
C['A' is correct, 'B' is getting tricked.]LB[of:B][qf:A]
(;W[qf];B[of];W[qg])

(;W[of];B[ne];W[qf];B[pg])
)
)

(;B[qf]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

White continues with 'a' or 'b'.

White 'c' is a mistake.
]
LB[od:c][pd:b][qe:a]
(;W[qe]C[Black continues with 'a', possibly 'b'.]LB[pf:b][pe:a]
(;B[pe]C[From here White cuts at 'a' or attaches underneath at 'b'.]
LB[ob:b][pf:a]
(;W[pf])

(;W[ob])
)

(;B[pf]C[Black 5 makes sense with local support on either side.];W[od]
;B[nc];W[pc]C[White 8 is the proper move.
'A' or 'B'.]LB[ld:B][nd:A]
(;B[nd];W[oe]C[Now 'a' and 'b' are miai.]LB[pi:b][kd:a])

(;B[ld];W[re])
)
)

(;W[pd];B[of];W[od];B[mc]
C[White continues with 'a' to get outside, or 'b' to take the corner.]
LB[nc:b][nd:a]
(;W[nd];B[md];W[nf])

(;W[nc];B[nd];W[nb];B[md];W[ob])
)

(;W[od]C[White 4 is a mistake.];B[pd];W[pc];B[ob]
C[White will have trouble looking after the corner stones. White
could play 'a' and immediately sacrifice the stones, but the
loss would be considerable.]
LB[pe:a];W[pe];B[qd];W[qe];B[rd];W[re]
C[Simply taking with 'a' is good enough for Black. Black may also
atari first with 'b' if that is strategically sensible.]
LB[oe:b][rc:a])
)

(;B[pf]
C[
Oogeima = Nunmokcha = Da` Fei = Large Knight's Move
----------------------------------------------------
]
;W[od];B[pd];W[pc];B[ob];W[nd];B[qd];W[rd];B[re];W[rc];B[mc];W[md];
B[lc];W[qe];B[pe];W[qf];B[qg];W[rf];B[rg];W[se];B[oh];W[mf])
)

(;W[qe]C['A' is better than 'B'.
'C' is not recommended.]
LB[qg:C][oe:B][qc:A]
(;B[qc]C['A' is correct, 'B' is questionable.]PL[2]LB[pg:B][qh:A]
(;W[qh];B[pg]
C[Black doesn't just take the corner, but still can go for influence.]
;W[qg];B[oe])

(;W[pg];B[qi])
)

(;B[oe];W[qc]
C[This result is the same variation as the one referenced by the
given numbers (which also has only one move continuation here).]
LB[oe:1][qc:2][oc:3][qe:4];B[pg])

(;B[qg];W[qc];B[lc])
)

(;W[oe]C['A' or 'B'.]LB[qc:B][qd:A]
(;B[qd]
C[This result is similar to the variation referenced by the numbers.]
LB[qd:1][oc:3][oe:4])

(;B[qc];W[nc]
C[The move is questionable.
'A' is correct, 'B' is not recommended, Black falls back from
a superior to an equal or inferior position.]
LB[nd:B][od:A]
(;B[od];W[nd];B[ne])

(;B[nd];W[od]C['A' fight, 'B' both settle.]LB[mc:B][ob:A]
(;B[ob];W[mc];B[me])

(;B[mc];W[pc];B[nb];W[ob];B[nc];W[pd];B[pb];W[qb];B[oa];W[rc];B[qa];
W[qd];B[id];W[pi])
)
)
)

(;W[dp]
C[
Tenuki
-------

'A' or 'B'.
'C' aims at a rare three-stone-shimari.
'D' is a trick play.
]
LB[qe:D][oe:C][pe:B][qd:A]
(;B[qd]
C[These variations are covered as Komuku-Tenuki-Mokuhazushi, referenced
by the numbers.]
LB[qd:1][oc:3])

(;B[pe]
C[This variation is covered as Takamoku-Tenuki-Mokuhazushi, referenced
by the numbers.]
LB[pe:1][oc:3])

(;B[oe];W[pp];B[qe]C[Pillbox shape.
])

(;B[qe];W[pd];B[oe]C['A' is correct, 'B' is inferior.]LB[qc:B][od:A]
(;W[od];B[nd]
C['A' is correct,
'B' is possible.
'C' is getting tricked.]
LB[nc:C][pc:B][pe:A]
(;W[pe];B[pf]C['A' is correct, 'B' is getting tricked.]LB[of:B][qc:A]
(;W[qc])

(;W[of];B[qd];W[pc];B[qc];W[pb];B[ne])
)

(;W[pc];B[pe];W[nc];B[mc]C['A' is correct. 'B' gives a ko.]
LB[ob:B][nb:A]
(;W[nb];B[mb];W[ob]C[White aji to cut at A.]LB[md:A])

(;W[ob];B[nb])
)

(;W[nc];B[pc];W[qd];B[qc];W[rd];B[pe];W[rc];B[rb];W[re];B[rf];W[ne];
B[md];W[qf];B[qg];W[pf];B[of];W[pg];B[og];W[ph];B[rg];W[qb];B[qa];
W[sb];B[ra])
)

(;W[qc];B[od];W[pe];B[pf];W[qf]C['A' is correct, 'B' is a mistake.]
LB[qg:B][rf:A]
(;B[rf];W[qg]C['A' is correct, 'B' is questionable.]LB[qd:B][rd:A]
(;B[rd];W[rc];B[rg];W[qh];B[rh]
C['A' os correct, 'B' is questioanable.]LB[qi:B][of:A]
(;W[of];B[pg];W[qi];B[og];W[qd];B[re];W[pb];B[ri];W[ob];B[qj];W[nf])

(;W[qi];B[of];W[qd];B[re];W[pb];B[ob];W[ri];B[sb];W[rb];B[sc];W[sd];
B[se];W[qa];B[pc];W[sh];B[oa];W[sg];B[pa];W[si];B[qb])
)

(;B[qd];W[pc];B[rc];W[rb];B[rd];W[ob];B[nb]
C['A' is correct, taking the corner, if White has the ladder, 'B'
is inferior making the corner seki, but unavoidable, if Black
has the ladder.]
LB[pb:B][qh:A]
(;W[qh]
C['A' is necessary, Black cannot capture on 'B' if White has the
ladder.]
LB[pb:B][og:A]
(;B[og];W[sb])

(;B[pb];W[qb];B[oa];W[of];B[pg];W[og];B[ph];W[pi];B[oh];W[nh])
)

(;W[pb];B[pg];W[rg];B[sb]C['A' -> seki, 'B' -> unfavorable ko.]
LB[qa:B][sc:A]
(;W[sc];B[sd];W[ra];B[sf];W[qi];B[mc])

(;W[qa];B[oa];W[sf];B[na];W[pa];B[ra];W[sa];B[sc];W[re];B[ra])
)
)
)

(;B[qg];W[rf];B[pg];W[re])
)
)
)
)

(;B[od]
C[
Takamoku = Gomok = Gaomu` = 5-4 Point
----------------------------------------------

The takamoku (high) point (5-4). With its emphasis on influence,
the 5-4 point complements the 4-4 (hoshi) point in creating an
influence-oriented fuseki.

White approaches with 'a *' or 'b'. White 'b *' is played when
Black has support at the top.

After White play tenuki 'c', Black can choose a shimari.

There are several 5-4 trick plays, often involving unfathomable
reading, with pitfalls at any point. Some simple variations of
trick plays are covered here.
]
LB[dp:c][qc:b][qd:a]
(;W[qd]
C[
Komoku
---------

Black responds with 'a *', 'b *', 'c *', 'd *' to 'f *'.

Black 'c' is the most appropriate response given the influence
orientation of the 5-4, but also the most complicated one.

'e' and 'g' are trick plays. Black 'g' takes thickness for corner
territory.

'h' is not recommended.

g7, f6, e5, d4, c3, b2, a1
]
LB[re:g][qg:f][qf:e][pg:d][pf:c][qe:b][qc:a][pd:h]
(;B[qc]
C[
Hikui-Tsuke-Hiki = Low attach to draw back
---------------------------------------------

White continues with 'a *' or 'b *'.
'c' is a mistake.
]
LB[pd:c][kc:b][rc:a]
(;W[rc];B[pc]C[White continues with 'a *' to 'c'.]LB[qf:c][pf:b][re:a]
(;W[re]
C[Black continues with 'a *'. If a Black extension such as 'a'
already exists, Black continues with 'b'.
Playing 'c' without having a is premature.]
LB[qf:c][pg:b][kc:a]
(;B[kc]
C[White continues with 'a *' or 'b *', or plays elsewhere ('c *').
'd' is a mistake.]
LB[pg:d][dp:c][oe:b][pf:a]
(;W[pf]
C[
* GOOD VARIATION *

Black may play elsewhere ('a'). Black 'b' and 'c' are local continuations.]
LB[oe:c][pg:b][dp:a];B[tt]
C[Black plays elsewhere. White can press with 'a', 'b' or 'd'.
White 'a' emphasizes the right side, while 'b' and 'd' are pure
reduction moves.

White 'c' can be played if White values the top.]
LB[ld:d][ic:c][nd:b][ne:a]
(;W[ne]C[Black can protect at 'a' or 'b'.]LB[nd:b][mc:a]
(;B[mc])

(;B[nd])
)

(;W[nd];B[me];W[ld])

(;W[ic]
C[White plays 9 with support in the top-left corner.

A Black extension to the red dot before White 10 is a first-rate
fuseki point.

Black continues with 'a'. Black should not ignore White 10 by
playing elsewhere ('b').]
LB[cq:b][ke:a]CR[hc]
(;B[ke]C[White 20 can be considered a forcing move.])

(;B[tt]
C[Black ignores White's checking extension, a mistake.
 
White invades.]
;W[mc]
C[Black continues with 'a', and lets White connect underneath.
Black 'b' is unreasonable.]
LB[ld:b][md:a]
(;B[md])

(;B[ld]C[Black 11 is unreasonable.];W[md];B[me];W[kb];B[jb];W[lb];
B[jc];W[ib];B[ja];W[ne])
)
)

(;W[ld]C[White 9 is a simple reduction move.];B[lc])
)

(;W[oe];B[ne];W[of];B[qf]
C[Black 11 is a tesuji at the vital point of White's shape.];W[pd];
B[nd];W[pi]C[
* GOOD VARIATION *])

(;W[tt]
C[White plays elsewhere. 

Black continues with 'a' or 'b *'. Black 'a' aims for influence,
while 'b' aims to build a presence on the right.]
PL[2]LB[qf:b][pg:a]
(;B[pg]C[White continues with 'a' or 'b'.]LB[oe:b][qf:a]
(;W[qf];B[pf]
C[White continues locally with 'a', or switches elsewhere again
('b').]
LB[cq:b][qh:a]
(;W[qh])

(;W[tt]C[White plays elsewhere again.];B[qg];W[rg];B[rh];W[tt]
C[Amazingly, White plays elsewhere again.];B[sg];W[rf];B[rb];W[sb];
B[qb];W[pe]
C[Black continues with 'a'. Black 'b', making a false eye, is not
recommended.]
LB[pd:b][oe:a]
(;B[oe];W[pd]
C[There is still a cutting point in Black's outside wall. This
outcome should not favor Black (with three White moves elsewhere).])

(;B[pd]C[Black should not play 20 here unless White can be killed.];
W[oe])
)
)

(;W[oe];B[pe];W[pd];B[oc];W[ne];B[qe];W[rd];B[qg];W[qb];B[pb];W[qa];
B[ng]C[Black 21 is a possible continuation.];W[mc];B[mb]
C[White continues with 'a'. White 'b' does not work.]LB[nb:b][le:a]
(;W[le])

(;W[nb]
C[White 24 is a mistake. Black continues with 'a'. Black 'b' is
a mistake.]
LB[nc:b][md:a]
(;B[md]C[Black's double contact play is a tesuji.];W[lc];B[lb];W[nc];
B[nd];W[ld];B[pa];W[sb];B[me];W[kd])

(;B[nc]C[Black 24 is a mistake.];W[lb];B[md];W[lc];B[nd])
)
)
)

(;B[qf]
C[Black 8 emphasizes the right side.

White continues with 'a *' or 'b'.]
LB[qg:b][pe:a]
(;W[pe]
C['A *' is correct, 'B' is a trick play which is not recommended.]
PL[2]LB[of:B][pg:A]
(;B[pg]C[White continues with 'a *' or 'b'.]LB[pf:b][oe:a]
(;W[oe]
C[Black continues with 'a *'. Black 'b' is a mistake in direction.]
LB[nd:b][ng:a]
(;B[ng]C['A' is correct, 'B' is a mistake.]LB[me:B][mg:A]
(;W[mg]
C[Black continues with 'a *'. Black 'b', 'c' and 'd' are unreasonable.]
LB[mf:d][ne:c][nf:b][nd:a]
(;B[nd];W[nf];B[nh];W[lf]C[
* GOOD VARIATION *])

(;B[nf]C[Black 15 is a mistake.];W[ne]C['A' is less bad than 'B'.]
LB[mf:B][mc:A]
(;B[mc];W[nc];B[nd];W[me];B[md];W[mf];B[nh];W[li])

(;B[mf];W[mc];B[md];W[nd];B[nc];W[nb];B[oc];W[mb];B[ob];W[qb])
)

(;B[ne]C[Black 15 is a mistake.];W[nd];B[nc];W[md];B[mc];W[nf];B[me];
W[og]
C[Black may be better off at top, but the original aim of building
the right side is ruined.]
;B[nh];W[oh])

(;B[mf];W[nf];B[ne];W[of];B[me];W[og])
)

(;W[me];B[nd];W[ne];B[ld])
)

(;B[nd]
C[Black 12 is change in direction from emphasis on the right, and
as such a mistake.]
;W[og];B[oh];W[ng];B[ph];W[ne])
)

(;W[pf]C['A' or 'B'.]PL[2]LB[qg:B][og:A]
(;B[og];W[qg];B[qh];W[rg];B[rh];W[rf])

(;B[qg];W[nf])
)
)

(;B[of];W[pf];B[pg]C['A' is correct, 'B' is getting tricked.]
LB[og:B][oe:A]
(;W[oe];B[ne]C['A' is correct, 'B' is getting tricked.]LB[og:B][qg:A]
(;W[qg]C['A' is correct, 'B' is a mistake.]LB[qh:B][og:A]
(;B[og];W[qh]C[The triangled stone is now too near to the wall.]TR[kc]
;B[md]C[Still a cut on A.]LB[nf:A])

(;B[qh];W[og];B[rg];W[nf])
)

(;W[og];B[qe])
)

(;W[og];B[oe];W[qg];B[ph];W[qh];B[pi])
)
)

(;W[qg]
C[White 9 is an emergency measure, and not recommended as an ordinary
play. White is too low.

Black 'a', keeping White low, is good enough. If Black wants
to play tough, 'b'.]
LB[rf:b][pg:a]
(;B[pg];W[rg];B[ph];W[qi])

(;B[rf]PL[2];W[rg];B[se];W[sd];B[sf];W[pf];B[qe];W[pe])
)
)
)

(;W[pg];B[pe];W[qg])
)

(;B[pg]AB[jc]
C[Black plays 7 when Black already has support at top as shown.];W[qf]
;B[pf]
C[White has been had. This variation demonstrates why White enters
at the 3-3 point rather than play the 3-4 when Black has an extension
at top as shown.])

(;B[qf];W[pe];B[ph]C['A' or 'B'.]LB[kd:B][ld:A]
(;W[ld])

(;W[kd])
)
)

(;W[pf]
C[White 6 is a strategy when Black has the lower right corner and
White wants to make a significant extension to the lower side.]
;B[rb];W[qj])

(;W[qf]AB[jc]
C[White plays 6 when Black already has an extension as shown.];B[rb];
W[qi])
)

(;W[kc]C[Black continues with 'a', 'b *' or 'c *'.]
LB[qe:c][rd:b][pd:a]
(;B[pd];W[qe]
C[Black continues with 'a' and ends in sente. Black 'b' is not
recommended, as Black gets a narrow extension and ends in gote.]
LB[qg:c][rc:b][pb:a]
(;B[pb];W[qh])

(;B[rc]
C[ Black 7 results in a narrow extension and ends in gote for Black.];
W[qh];B[mc]C[Black 9 nine is one space too close.])

(;B[qg];W[rc];B[rb]
C[
If you are high-dan and know the follow-up. mail it to me please:
kogo@waterfire.us.])
)

(;B[rd]C[White continues with 'a *'. White 'b' is a mistake in order.]
LB[qe:b][pc:a]
(;W[pc];B[pd];W[qe]C[Black continues with 'a' or 'b *'.]LB[re:b][rc:a]
(;B[rc];W[oc]C[White 10 is a continuation.];B[nc];W[nb];B[nd];W[mb];
B[pf])

(;B[re];W[qf];B[qb];W[of]C[
* GOOD VARIATION *];B[tt]
C[Black plays elsewhere. White continues with 'a' or 'b'.]
LB[ob:b][nd:a]
(;W[nd];B[nc];W[md])

(;W[ob];B[nb];W[nc];B[oc];W[mb];B[pb];W[na])
)
)

(;W[qe]C[White 6 is a mistake in order.];B[re];W[pc];B[qb]
C[White continues with 'a'. White 'b' is a mistake.]LB[pd:b][qf:a]
(;W[qf];B[oc]
C[In Comparision with the result of White 8 before White 6, one
can see, that after the mistake White 6, there is now no aji
of connecting White 8 to 4.]
LB[kc:4][qe:6][pc:8])

(;W[pd]C[White 10 is a mistake.];B[qf];W[oe]
C[White is getting short of liberties.];B[nd];W[ne];B[ob]
C[And the Black stones can connect with 15.];W[oc];B[nc];W[pb];B[pa];
W[pe];B[mb])
)
)

(;B[qe];W[pd]
C[Black continues with 'a *'. Black 'b' is not recommended.]
LB[pe:b][pc:a]
(;B[pc];W[pe];B[rd]
C[Joseki continues with 'a *'. White 'b' is from a professional
game, but not recommended.]
LB[pf:b][re:a]
(;W[re];B[qf]
C[White continues with 'a *' for influence, or 'b' to live peacefully
in the corner at a loss of influence.]
LB[rc:b][oe:a]
(;W[oe];B[rc];W[nd];B[oc];W[pg];B[rf];W[ng]C[
* GOOD VARIATION *])

(;W[rc]C[White 12 gives a peaceful result.];B[of]
C[White continues with 'a'. White 'b' is unreasonable.]LB[oc:b][sd:a]
(;W[sd];B[pf];W[rb];B[oe];W[rd]
C[Next, Black plays elsewhere. The marked cutting point is small
early in fuseki.]
CR[oc])

(;W[oc]C[White cannot cut at 14.];B[oe];W[sd];B[pf];W[rd];B[ob];W[nc];
B[nb];W[mc];B[rb];W[sb];B[qb]
C[White 'a' results in a ko, but the stakes are too high. White
'b' and Black wins the fight outright.]
LB[pa:b][rf:a]
(;W[rf];B[rg];W[rh];B[sg];W[sf];B[qh];W[pa];B[mb];W[lb];B[ld];W[lc];
B[pb];W[ma];B[ra];W[na];B[sa]
C[Black has first shot at the ko. White loses.])

(;W[pa];B[rf]
C[White can provoke a ko by playing at the marked spot, but a White
loss is inevitable.]
CR[sf])
)
)
)

(;W[pf]
C[White 10 was played by Sakata Eio against Rin Kaiho in the 2nd
game of the 1965 Meijin Title match.

Black gets a favorable result.

Black continues with 'a'. Black 'b' is not recommended.]
LB[re:b][qf:a]
(;B[qf];W[rc];B[pg]
C[White continues with 'a'. White 'b' is not recommended.]
LB[re:b][of:a]
(;W[of];B[rb];W[re];B[sc];W[qg];B[rf];W[rg];B[se];W[oh])

(;W[re]
C[White 14 is not recommended. The corner ends in a seki. Black
has a favorable position on the right, while the top equals out
at best for White.]
;B[of];W[sd];B[oe];W[rd];B[qg];W[oc];B[ob];W[nc];B[nb];W[mb];B[rb];
W[sb];B[ra];W[rf];B[rg];W[sf];B[pb];W[og];B[md];W[mc];B[mf];W[qa];
B[pi])
)

(;B[re]
C[Black must have the ladder to play this way. Even so, White gets
a ladder block move in the lower left corner.]
;W[oc];B[nc];W[ob];B[nb];W[nd];B[oe])
)
)

(;B[pe]
C[Black 7 is not recommended. Black builds thickness in gote, gives
away a large corner in the process, while White's pincer stone
retains its purpose.]
;W[pc];B[oc];W[pb];B[ob];W[re];B[rf];W[rd];B[oe])
)
)

(;W[pd];B[pc];W[oe];B[ne];W[nd];B[oc];W[nf];B[me];W[of];B[mf]
C[White failed to establish eye-shape, Black got more points.])
)

(;B[qe]
C[
Taka-Tsuke-Hiki = High attach to draw back
----------------------------------------------

Black 3 aims to build influence, but this could alter. A favorable
ladder for Black is desirable, but not necessary.
'A' is correct, 'B' is a mistake.
]
LB[pd:B][re:A]
(;W[re]C[Black continues with 'a *', possibly 'b *'.]LB[qf:b][pe:a]
(;B[pe]
C[White continues with 'a *' (joseki). 

After White 'b *', White is low.

White 'c' is not joseki.]
LB[pc:c][rf:b][qf:a]
(;W[qf]
C[Black continues with 'a *', 'b', 'c *' or 'd'.
Black must have the ladder to play 'a'.

outcomes:

a1 - Black outside (Black must have the ladder)
b2 - Black inside
c3 - Fighting
d4 - Black avoids basic patterns, and may trick White]
LB[pg:d][pf:c][rf:b][rd:a]
(;B[rd]
C[Black plays 7 to take the outside. Black must have the ladder
to catch White 6 to play this way.]
;W[rc];B[rf];W[sd];B[qg]
C[
* GOOD VARIATION *

Black must have the ladder.

White continues at 'a' with joseki. To play elsewhere ('b') invites
a loss. If White does it once, he might well do it twice more,
get a ko and have good position on the whole board.
White 'c' is a mistake.]
PL[2]LB[oc:c][ob:a]
(;W[ob];B[pf];W[tt]C[White plays elsewhere.];B[nb]
C[This is Black's continuation to try to seal White in, but White
trades the corner for the side with 'a'. 

White 'b' is vulgar.

White 'c' preserves the corner if the side is not worth the corner
sacrifice.]
LB[pb:c][oc:b][nc:a]
(;W[nc];B[oc];W[mb];B[pb];W[na];B[pc]
C['A' is correct, although White sacrifices the corner to take
sente.
After White 'B' the corner lives, but outside group is severely
attacked.]
LB[qb:B][nd:A]
(;W[nd];B[pa]
C[If Black omits 23, White 'a' brings the corner back to life.
The result is equal.]
LB[qb:a])

(;W[qb];B[pa];W[sb];B[jc];W[nd];B[mf])
)

(;W[oc]C[White 15 is a vulgar move.];B[nc];W[pd];B[qb]
C[Black 19 is effectively timed.];W[pb];B[nd]
C[Black gets good outside influence while retaining some ominous
corner potential.])

(;W[pb]C[White keeps the corner, giving Black the top.];B[nc])
)

(;W[tt]C[White playing elsewhere is a mistake.];B[pc]
C[White plays 'a' to save the corner, or elsewhere ('b') and loses
the corner.]
LB[qc:a]
(;W[qc];B[pf]C[White play elsewhere the second time.]PL[2];B[pb]
C[The move is sente, but White plays elsewhere the third time.]PL[2];
B[ra]
C[After giving White three moves elsewhere, Black can nothing else
but a ko.]
;W[rb];B[sb];W[qa];B[qb];W[sa])

(;W[tt]C[White plays elsewhere.];B[qb]
C[Black can capture the corner, but has taken many stones to do
so.])
)

(;W[oc];B[nc];W[pc];B[pf];W[nd];B[mc];W[ne];B[kd]
C[The White center stones are heavy.])
)

(;B[rf]C[Black plays 7 to take the inside.];W[rg]
C[Black continues with 'a' or 'b'.]LB[pf:b][rd:a]
(;B[rd];W[sf];B[qc]
C[White continues with 'a'. White 'b' is not recommended. White
should not forget 'a' and play elsewhere on 'c'.]
LB[dp:c][og:b][pf:a]
(;W[pf]C[Black continues with 'a', 'b' or elsewhere.]
LB[dp:c][ne:b][of:a]
(;B[of]C[Continuation.];W[og];B[nf]
(;W[jc]
C[Black continues with 'a'. Playing elsewhere ('b') is a mistake.]
LB[dp:b][lc:a]
(;B[lc]C[Black 17 is a big point.])

(;B[tt]C[Black should not play elsewhere.];W[rc]
C[Black continues with 'a'. Black 'b' is unreasonable.]LB[sd:b][pd:a]
(;B[pd]C[Black 18 is submissive, but necessary.];W[sd];B[rb];W[qd];
B[pb])

(;B[sd]C[Black 18 is a mistake, thanks to a White tesuji.];W[pc]
C[Black continues with 'a'. Black 'b' compounds the mistake.]
LB[qb:b][pd:a]
(;B[pd];W[qb];B[qd];W[oc])

(;B[qb]C[Black 20 compounds the mistake.];W[pd];B[oe];W[sc])
)
)
)

(;W[ng];B[mf])
)

(;B[ne]C[White can attack on 'A'. 'B' is wrong.]LB[nf:B][lc:A]
(;W[lc]C[Black should not tenuki.]PL[2];W[rc]
C['A' is correct, 'B' is a mistake.]LB[pd:B][sd:A]
(;B[pd];W[sd];B[rb];W[qd];B[pb])

(;B[sd];W[pc]C['A' is bad, 'B' is worse.]LB[qb:B][pd:A]
(;B[pd];W[qb];B[qd];W[oc])

(;B[qb];W[pd];B[oe];W[sc])
)
)

(;W[nf]C[White 14 is a mistake which only makes Black stronger.]
LB[nf:14];B[mf];W[of];B[me])
)

(;B[tt]C[Black plays elsewhere.];W[ne];B[mc])
)

(;W[og]C[White 12 lacks force, as the continuation demonstrates.];
B[tt];W[rc]
C[White 13 no longer works because of the extra liberty to the
right of Black 5 (where White 12 should be).]
;B[sd];W[pc];B[qb])

(;W[dp];B[pg];W[qi])
)

(;B[pf]C[White continues with 'a'. White 'b' is a mistake.]
LB[qg:b][sf:a]
(;W[sf]C[White 10 is the only move.];B[qg]
C[After White 'A' a complicated fight arises. White 'B' is simple,
but weak.]
LB[rf:B][qh:A]
(;W[qh]
C[White must not play 12 at 'a', letting Black extend to 12.

Black continues with 'a' or 'b'.]
LB[pg:b][rf:a]
(;B[rf]
C[White continues locally with 'a'.

White 'b' is from a professional game, where White played elsewhere.]
LB[dp:b][rc:a]
(;W[rc]C[Black continues with 'a'. Black 'b' is vulgar.]LB[ph:b][pg:a]
(;B[pg];W[ri];B[oi])

(;B[ph]C[Black 15 lets White improve his shape.];W[qi];B[pi];W[pj];
B[oj];W[pk]
C[White does not shrink from the ko, and aims to cut at the marked
location.]
CR[oi])
)

(;W[tt]
C[Variation 'a' is from the final preliminary round of the 1957
Honinbo Title: White - Sugiuchi; Black - Etsuo.

In variation 'b', Black challenges the ko.]
LB[rd:b][dp:a]
(;B[tt]C[Black responds to White's move by playing elsewhere.];W[qf];
B[pg];W[ph];B[oh];W[oi];B[rf];W[nh];B[rh];W[qf];B[og];W[ri];B[ni];
W[oj];B[tt];W[mh];B[rf];W[sh];B[rd];W[qf];B[qc])

(;B[rd]C[Black challenges White, but lacks ko threats.];W[qf];B[qc];
W[pg];B[og];W[oh];B[ng];W[nh])
)
)

(;B[pg];W[ph];B[rf];W[rc];B[rh];W[qf];B[oh];W[oi];B[rf];W[sg];B[nh];
W[ni];B[mi];W[pj];B[mh])
)

(;W[rf];B[qh];W[qc])
)

(;W[qg]C[White 10 is a mistake.];B[rd];W[sf];B[qc]
C[Now White is tricked, because after Black takes the corner, White
wants to play A as in the joseki, but the point is already occupied
by the opponent.]
LB[pf:A])
)
)

(;B[pf]
C[Black 7 is for strong fighters.
'A' is correct, 'B' is a mistake.]
(;W[qg];B[rf]C['A *' is correct, 'B' and 'C' are mistakes.]
LB[rc:C][rg:B][rd:A]
(;W[rd]
C[Black continues with 'a *'. Black 'b' builds thickness, but gives
up too much territory.]
LB[pg:b][qh:a]
(;B[qh]
C[White continues with 'a *' or 'b'. White 'a' can give a settled
shape or start a fight at White's choice. White 'b produces a
fight.]
LB[pg:b][rg:a]
(;W[rg];B[pg]
C[White 'a *' starts a fight. Alternately, to avoid a fight, White
may play 'b', which settles the shape without loss to White.]
LB[rh:b][ph:a]
(;W[ph]C[White 14 is a fighting move.];B[rh];W[sf];B[qj];W[oh];B[oj];
W[mh];B[ld]C[
* GOOD VARIATION *])

(;W[rh]C[White plays it safe.];B[qi])
)

(;W[pg]C[White 12 starts a fight.];B[rg]
C[White continues with 'a', possibly 'b'.]LB[og:b][ph:a]
(;W[ph];B[qi]C[White continues with 'a' or 'b'.]LB[oc:b][pi:a]
(;W[pi];B[qj];W[oc];B[nc]
C[White continues with 'a'. White 'b' is not recommended.]
LB[pc:b][ob:a]
(;W[ob];B[pd];W[pc];B[md];W[nb];B[lc];W[ne];B[nd];W[ng])

(;W[pc]C[White 20 is not recommended.];B[nd])
)

(;W[oc];B[nc];W[pc];B[pi];W[nh];B[oi];W[ng];B[nd])
)

(;W[og]C[White 12 is not recommended.];B[pc]
C['A' settles the corner,
'B' creates a a ko, leading to furikawari with superior Black
influence and a White corner..]
LB[pd:B][qc:A]
(;W[qc];B[pb];W[qb]
C[White is alive because of the liberty at the marked point, which
makes a Black play there sente for the White group in the corner.]
CR[pd];B[pi])

(;W[pd];B[oe];W[oc];B[qc];W[rc];B[rb];W[sb];B[qb];W[ra];B[sc];W[sd];
B[qa];W[rh]C[creates ko threats];B[ri];W[pa];B[sa];W[sf];B[sh];W[ra];
B[ng];W[pb];B[oh])
)
)
)

(;B[pg];W[qh];B[ph];W[qi])
)

(;W[rg];B[rd];W[sf];B[qc]
C[White is tricked, because after Black takes the corner, White
wants to play onto A, as he does in the joseki.
White 8 would even be much better on the marked position.]
LB[qg:8][pf:A]TR[pg])

(;W[rc];B[se];W[rd];B[qh];W[rg];B[pg];W[rh];B[qi]
C[Later, Black A threatens a ko at A.]LB[sg:B][ri:A])
)

(;W[rg];B[qg];W[rf];B[qh]C[Black has a continuation at A later.]
LB[qc:A])
)

(;B[pg]
C[White continues with 'a' or 'b'. White 'c' and 'd' are mistakes.]
LB[qg:d][qh:c][pf:b][qc:a]
(;W[qc];B[pf];W[rf])

(;W[pf]C[soto-magari (outside turn)];B[of];W[rg];B[og];W[qi])

(;W[qh]C[White 8 is a mistake.];B[rd];W[rc];B[rf];W[sd];B[qg])

(;W[qg]C[White 8 is a mistake.];B[qh]
C[White continues on 'A', 'B' is an overplay.]LB[ph:B][rh:A]
(;W[rh];B[ph])

(;W[ph];B[pf];W[qi];B[rh];W[rg];B[sg];W[rf];B[ri];W[qj];B[rj];W[qk];
B[rk];W[ql];B[rc];W[rd];B[qc])
)
)
)

(;W[rf]
C[White plays 6 to avoid the result in which his outside stone
is captured, but in the local context this move is disadvantageous.]
;B[qc]C[White continues with 'a *'. White 'b' is not joseki.]
LB[rd:b][rc:a]
(;W[rc];B[pd];W[rd]C['A *' is joseki, 'B' emphasizes the center.]
LB[ph:B][qb:A]
(;B[qb];W[qh];B[kc]C[
* GOOD VARIATION *])

(;B[ph];W[qb])
)

(;W[rd];B[pc];W[qh];B[kc]
C[White does not have as good an eye shape as joseki, and needs
to add a play at 'a' to get a satisfactory position.]
LB[qk:a])
)

(;W[pc]
C[White attempts to forestall the Black contact play at the marked
location.

Black continues at 'a'. Black 'b' is not as good.]
LB[oc:b][rf:a]CR[qc]
(;B[rf];W[oc];B[nc]
C[White continues with 'a'. White 'b' is unreasonable.]LB[nd:b][nb:a]
(;W[nb];B[mc];W[mb];B[lc];W[rd];B[qg])

(;W[nd]
C[White 10 is unreasonable. White starts a losing fight.
Both 'A' and 'B' are good for Black.]
LB[mc:B][lc:A]
(;B[lc];W[ne];B[nb];W[rd];B[pg];W[le];B[jd])

(;B[mc];W[md];B[ld];W[mf];B[kc];W[rd];B[pg];W[of];B[pi])
)
)

(;B[oc]C[Black 7 is not recommended.];W[rf];B[kc]
C[Black cannot attach at 'a' successfully when White plays elsewhere.]
LB[qc:a];W[tt]C[White plays elsewhere.];B[qc]
C[Black cannot play 11 successfully, though White must play correctly.]
;W[qb];B[rc];W[pb];B[rd];W[pd];B[rb];W[ob]
C[Black cannot block at 'a' because of the cutting point at 'b'.]
LB[oe:b][nb:a];B[nb];W[oe])
)
)

(;B[qf]
C[The wisdom of Black 5 is controversial.

Yoshio Ishida commented that the Black 5 is "slightly vulgar
in style".

This variation is seldom played by professionals.

Supporting stones may make this play smart for Black.]
;W[pd];B[oe]
C[White 'a *' is old Japanese style.
White 'b *' is modern Korean style.
'c' is inferior.]
LB[oc:c][rf:b][ob:a]
(;W[ob]
C[Black 'A *' is joseki and emphasizes the top, Black 'B' the right,
but is inferior.]
LB[rf:B][nb:A]
(;B[nb]C[Black values the top.];W[pb];B[mc];W[rf]
C['A *' is joseki, 'B' is questionable.]LB[id:B][qh:A]
(;B[qh]
C[
* GOOD VARIATION *

White has solid corner territory.

Black still faces the aji of White's push at 'a' and the cut
at the marked point, so the result is not generally considered
equal.]
LB[pe:a]CR[of])

(;B[id];W[og];B[of];W[qg];B[ng];W[oh];B[nh];W[oi])
)

(;B[rf]C[Black prefers the right.];W[mc]C[White moves out.];B[rd];
W[rc];B[se];W[me]
C[White 14 gives White good position at top.

White need not worry about connection. 'a' and 'b' are miai:
Black 'a', White 'b'; Black 'b', White 'a'.]
LB[pb:b][oc:a])
)

(;W[rf]C['A *' is joseki. 'B' is a trick play.]LB[rc:B][qh:A]
(;B[qh];W[oc];B[nc];W[pb];B[ob];W[pc];B[md]C[
* GOOD VARIATION *])

(;B[rc]
C[Black 9 invites many White mistakes, but answered correct it's
just an empty threat.
'A' gives White a better position. 'B' or 'C' fails to do so.]
LB[rc:9][pe:C][rd:B][qg:A]
(;W[qg];B[pg]C['A' is correct, 'B' is a mistake.]LB[ph:B][qh:A]
(;W[qh]C[Black plays 'A'. 'B' does nothing.]LB[rd:B][oc:A]
(;B[oc];W[pb]C[Black plays 'A'. 'B' and 'C' do nothing.]
LB[rb:C][rd:B][ob:A]
(;B[ob];W[rb]
C['A' possible outside continuation, inside with 'B' Black can
do nothing.]
LB[qc:B][ph:A]
(;B[ph];W[qi];B[id];W[pi];B[oi];W[oj];B[ni];W[po])

(;B[qc];W[pc];B[qb];W[qa];B[sb];W[ra];B[rd];W[sd])
)

(;B[rd];W[rb])

(;B[rb];W[qb];B[rd];W[ra];B[pc];W[qc];B[ob];W[sb])
)

(;B[rd]C['A' is ok, 'B' fails.]LB[pb:B][qb:A]
(;W[qb]C[Neither 'A' nor 'B' work.]LB[qc:B][pb:A]
(;B[pb];W[pc];B[ob];W[rb]C[White has a better position.])

(;B[qc];W[pc];B[pb];W[ob];B[pa];W[oa];B[oc];W[qa];B[pb];W[pa];B[pe];
W[pb];B[rb];W[mb])
)

(;W[pb];B[qb];W[pc];B[oc];W[ob];B[nb])
)
)

(;W[ph];B[rg];W[qh];B[rd];W[rh];B[pb])
)

(;W[rd]C['A' is correct, 'B' a mistake.]LB[oc:B][qh:A]
(;B[qh];W[oc];B[nc];W[pb];B[ob];W[pc];B[md])

(;B[oc];W[pb];B[ob];W[qb];B[jc];W[qg];B[pg];W[ph];B[og];W[qi]
C[White comes out making Black 15 overconcentrated.]LB[jc:15])
)

(;W[pe]C[Black continues on 'A', 'B' is a mistake.]LB[rd:B][pf:A]
(;B[pf];W[rd]C['A' is correct, 'B' is questionable.]LB[oc:B][qh:A]
(;B[qh];W[oc];B[nc];W[pb];B[ob];W[pc];B[md];W[rg];B[oh])

(;B[oc];W[qh]C[A and B are miai.]LB[pb:B][of:A]
(;B[of];W[pb];B[ob];W[qb];B[jd])

(;B[pb];W[of];B[nf];W[og])
)
)

(;B[rd];W[pg];B[qg];W[qh];B[rg];W[rh];B[se];W[pf];B[sf];W[oi])
)
)
)

(;W[oc]C[White 8 is premature.];B[nc];W[pb]
C['A' influences the right side and is the right punishment. 'B'
reverts to a balanced position.]
LB[ob:B][rf:A]
(;B[rf];W[nb];B[mc])

(;B[ob];W[pc];B[md];W[rf];B[qh])
)
)
)

(;W[pd];B[pe];W[oc];B[nc]C['A' or 'B'.]LB[nd:B][pb:A]
(;W[pb];B[ob];W[pc];B[nd]C[Black's influence is superior.])

(;W[nd];B[oe]C['A' or 'B'.]LB[mc:B][ob:A]
(;W[ob];B[mc])

(;W[mc];B[nb]C['A' is correct, 'B' is a mistake.]LB[md:B][pb:A]
(;W[pb];B[mb]C['A' is correct, 'B' is wrong.]LB[lc:B][rb:A]
(;W[rb];B[lc])

(;W[lc];B[md];W[ne];B[ld];W[kc];B[kd]
C[White loses stones on 'A' or 'B'.]LB[jc:B][nf:A]
(;W[nf];B[jc])

(;W[jc];B[nf];W[me];B[lf]
C[White still has to live on 'A', or Black enters on 'A'.]PL[2]
LB[rb:A];W[rb])
)
)

(;W[md];B[ob];W[pc];B[pb];W[qb];B[rd];W[qc];B[rc])
)
)
)
)

(;B[pf]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

Black 3 can be regarded as the most appropriate continuation
from the 5-4 stone. At least, it is the most complicated.

White continues with 'a *' or 'b *' or plays elsewhere ('c *').
White 'd' is not recommended.

Most of the complications come after 'a', but White can simplify.

White should have the ladder for 'b'.
]
LB[rf:d][dp:c][qf:b][oc:a]
(;W[oc]
C[Black continues with 'a' to 'c'. 

Black 'a *' and 'b *' aim to build influence along the top and
are easy.

Black 'c *' starts a difficult fight. Black must have the ladder
off Black 3 to play this way.]
LB[pc:c][pd:b][nc:a]
(;B[nc];W[pc]C[Black continues with 'a *', 'b *' or 'c *'.]
LB[nb:c][md:b][nd:a]
(;B[nd]
C[
* GOOD VARIATION *

White often plays elsewhere (a). White continues locally with
'b'.]
LB[rf:b][dp:a]
(;W[tt]
C[White plays elsewhere.

Black continues locally with 'a' or 'b'.
'a' threatens to kill, 'b' to make a ko.]
LB[rf:b][re:a]
(;B[re];W[rd]
C[Black may continue locally with 'a' for thickness, though this
is not played early in the game.

'b' shows White's continuation locally (after Black tenuki).]
LB[dp:b][qe:a]
(;B[qe];W[pd];B[pe];W[tt]C[White plays elsewhere.];B[ob]
C[Black 13 is sente.];W[pb];B[nb];W[rb]
C[White 16 is necessary to live.])

(;B[tt]C[Black plays elsewhere.];W[pe]
C[White 10 is normally vulgar style.];B[of];W[qf];B[qg];W[rf]
C[Black continues with 'a' or, if the cut at the marked spot is
no problem, 'b'.]
LB[rg:b][oh:a]CR[pg]
(;B[oh])

(;B[rg]
C[To play this way, Black must not be worried about a cut at the
marked location.]
CR[pg])
)
)

(;B[rf]
C[Anything White would reply would be submissive, so naturally
White plays elsewhere.]
;W[tt]C[White plays elsewhere.];B[rb]
C[Black 9 is the obvious torment.];W[rc];B[qb];W[re]
C[Black continues with 'a'. Black 'b' is from professional play,
but is not recommended.]
LB[qe:b][pd:a]
(;B[pd];W[qc];B[qe]
C[White continues with 'a'. White 'b' is not recommended.]
LB[nb:b][sb:a]
(;W[sb];B[se];W[ra];B[qa];W[pb];B[sa]C[Ko])

(;W[nb]C[White 16 is not recommended.];B[mb];W[sf];B[sg];W[se];B[rg];
W[sb];B[sd];W[rd];B[ob];W[pb];B[na];W[pa])
)

(;B[qe]
C[Black 13 was played by Hashimoto Shoji against Rin Kaiho in the
1965 Meijin league. This sequence is a mistake.]
;W[pe];B[qf];W[pd];B[nb];W[oe];B[ng];W[ne];B[me];W[ob];B[mf];W[sd];
B[sf];W[sb];B[se];W[rd];B[qa];W[pa]
C[Black can get a ko on the 1-1 point.]MA[sa])
)
)

(;W[rf];B[qg];W[rg];B[qi])
)

(;B[md]
C[
* GOOD VARIATION *

White continues by playing elsewhere (a). Local continuations
at 'b' and 'c' are shown.]
LB[oe:c][qf:b][dp:a]
(;W[tt]C[White plays elsewhere.];B[re];W[rd])

(;W[qf]
C[White 8 is not recommended. Black gets good shape for small White
profit.]
;B[qg]C['A' or 'B'.]LB[pg:B][rf:A]
(;W[rf];B[pd];W[qc];B[ph])

(;W[pg];B[of];W[rf];B[qh])
)

(;W[oe]C[White 8 is a mistake.];B[pe];W[pd]
C[Black continues with 'a'. Black 'b' is a mistake.]LB[nd:b][of:a]
(;B[of]C[White 'a' and 'b' are both bad.]LB[ne:b][nd:a]
(;W[nd];B[ne];W[od];B[me]C[White has achieved nothing.])

(;W[ne]
C[Black continues with 'a' to seal White in, or 'b' to create a
target of White stones running to the center.]
LB[nd:b][mf:a]
(;B[mf];W[nd];B[mc])

(;B[nd];W[me];B[ld];W[le];B[kd];W[mg];B[re];W[rd];B[oh])
)
)

(;B[nd]C[Black 11 is what White was hoping for.];W[rf];B[qg];W[rg];
B[qh]C[White gets an efficient result.])
)
)

(;B[nb]
C[White continues with 'a *' or 'b'. Playing elsewhere ('c') is
a mistake.]
LB[dp:c][nd:b][rf:a]
(;W[rf];B[ng]
C[White continues with a checking extension, such as 'a'. Because
of Black 9, a White cut at 'b' only strengthens Black.]
LB[nd:b][ic:a]
(;W[ic];B[rg]C[White continues with 'a'. White 'b' is a mistake.]
LB[qg:b][re:a]
(;W[re];B[qg])

(;W[qg]C[White 12 is an overplay.];B[qf];W[rh];B[re];W[sg]
C[Black continues with 'a'. Black 'b' is tough, and trouble.]
LB[rd:b][qe:a]
(;B[qe];W[rd];B[se];W[rb];B[pg];W[ph];B[qi];W[qh];B[qk])

(;B[rd]C[Black 17 is not recommended.];W[rc];B[qe];W[pd];B[rb];W[oe];
B[nd];W[of];B[pg];W[og];B[ph];W[pe];B[oh];W[me];B[qb];W[mf];B[kc])
)
)

(;W[nd]C[White 10 is a mistake.];B[md];W[ne];B[me];W[oe];B[pe];W[pd];
B[nf])
)

(;W[nd]
C[Black continues with 'a' or 'b'.

Black 'a' results in split groups and fighting.

Black 'b' gives up the corner for the right side.]
LB[nf:b][pd:a]
(;B[pd];W[qc]
C[Black continues with 'a' or 'b'. Both result in split groups
and continued fighting.]
LB[md:b][nf:a]
(;B[nf];W[md];B[lc])

(;B[md];W[ne];B[of];W[nf];B[re];W[ng]
C[Black continues with 'a'. Black 'b', capturing the corner, is
a mistake.]
LB[ob:b][ph:a]
(;B[ph];W[ob];B[kc];W[qe];B[qf];W[ni];B[pk])

(;B[ob]C[Black 17, capturing the corner, is a mistake.];W[qg];B[rg];
W[rh];B[rf];W[pg];B[rd]
C[White 'a' is sente, so White builds a wall of steel.]LB[og:a])
)
)

(;B[nf];W[md];B[pd];W[mc];B[qc];W[qb];B[rc];W[ob];B[rb];W[mb])
)

(;W[tt]C[White plays elsewhere, a mistake.];B[re];W[rd];B[qe];W[pd];
B[oe];W[ob];B[tt]C[Black plays elsewhere.];W[pe]
C[If White plays 14....];B[of];W[qf];B[qg]
C[Black gives up the two stones.])
)
)

(;B[pd];W[pc]C[Black continues with 'a *' or 'b'.
]LB[qe:b][qc:a]
(;B[qc]
C[White 'a *' is joseki. White 'b' is a trick play. White 'c' is
a mistake.]
LB[qb:c][qe:b][rc:a]
(;W[rc];B[qb];W[rb];B[qe];W[rd];B[nc];W[pb];B[ob];W[qa];B[md];W[ne];
B[nd]C[
* GOOD VARIATION *])

(;W[qe]
C[White 8 is a trick play.

Black continues with 'a'. Played correctly, Black gets a "flower-viewing"
ko.

Black is tricked if he plays at 'b' or 'c'.]
LB[qb:c][qf:b][rc:a]
(;B[rc]
C[White may try 'a' or 'b'. Neither work if Black plays correctly.
'c' is very bad.]
LB[nc:c][rd:b][qf:a]
(;W[qf];B[nc];W[nb];B[mb];W[qb];B[rb]C[Neither 'A' nor 'B' help.]
LB[pb:B][ob:A]
(;W[ob];B[mc];W[ra]
C['A' makes a direct ko and is correct,
'B' only makes a two step ko.]
LB[na:B][pa:A]
(;B[pa]C[White may try 'a' or 'b'. Both result in ko.]LB[rd:b][qa:a]
(;W[qa];B[na];W[pb];B[ma];W[oa];B[sa];W[sb];B[sc])

(;W[rd];B[qa];W[sb];B[sa])
)

(;B[na];W[pa];B[ma];W[oa];B[sa];W[sb];B[sc];W[rd])
)

(;W[pb];B[oa]C[Neither 'A' or 'B' help.]LB[nd:B][mc:A]
(;W[mc];B[nd];W[lb];B[ob];W[ma];B[qa])

(;W[nd];B[mc];W[of];B[ne];W[pe];B[md];W[oe];B[nd])
)
)

(;W[rd];B[qb]
C['a' and 'b' are miai. Black's reply (at 'b') to White 'a' is
less obvious (than White 'b', Black 'a').]
LB[qf:b][nc:a];W[nc];B[qf];W[rf];B[rg];W[qg];B[sf];W[re];B[pg];W[qh];
B[rh]C['A', 'B' or 'C' don't work.]LB[ri:C][pe:B][qi:A]
(;W[qi];B[sd])

(;W[pe];B[oe];W[of];B[sd])

(;W[ri];B[qi];W[ph];B[rj];W[pe];B[oe];W[of];B[og];W[nf];B[sd])
)

(;W[nc];B[qf])
)

(;B[qf]
C[Black 9 is a mistake. Black should have played at the red dot.]
CR[rc];W[rc]C[Black 'a' is better than 'b'.]LB[nc:b][qb:a]
(;B[qb];W[rb];B[nc];W[pb];B[ob];W[qa];B[nf])

(;B[nc];W[qb];B[nd]C[White aji to cut at A.]LB[pe:A])
)

(;B[qb];W[nc];B[qf];W[rf];B[rg];W[rc];B[rb];W[rd]
C['A' is correct, 'B' is a mistake.]LB[sb:B][sc:A]
(;B[sc];W[sb];B[sa];W[se];B[pe];W[pb];B[qa];W[nd]
C[White aji to cut at A.]LB[qg:A])

(;B[sb];W[pe];B[oe];W[of])
)
)

(;W[qb]C[White 8 is a mistake in style.];B[rc]
C[White continues with 'a' or 'b'. White 'b' somewhat salvages
the situation.]
LB[nc:b][rb:a]
(;W[rb];B[rd];W[nd]
C[Black 'a' is good enough. Black 'b' wreaks havoc on White, but
Black must have the ladder to play 'b'. Black may also play elsewhere
('c').]
LB[dp:c][nc:b][qe:a]
(;B[qe];W[mc])

(;B[nc]C[Black must have the ladder to play this way.];W[mc];B[nb];
W[ob];B[oa];W[pb];B[mb];W[ne];B[of];W[lc];B[lb]
C[Neither White 'a' nor 'b' work.]LB[kc:b][kb:a]
(;W[kb];B[kc];W[jb];B[md];W[ld];B[me];W[nf];B[jc];W[la];B[le])

(;W[kc];B[sb])
)

(;B[tt]
C[Black plays elsewhere. This variation illustrates that White
cannot pull out White 2 by playing at the marked spot.]
MA[qe];W[qe]C[White 13 does not work.];B[re];W[qf];B[qg])
)

(;W[nc]C[White cuts his losses.];B[rb];W[nd];B[of];W[jc])
)
)

(;B[qe]C[White continues with 'a' or 'b *'.
]LB[qc:b][rd:a]
(;W[rd]
C[Black continues with 'a' or 'b'.
Some professionals think, that 'a' is advantageous for White, and play only 'b'.
]
LB[nc:b][qc:a]
(;B[qc]C[White continues with 'a' or 'b'. 'c' is questionable.
]
LB[re:c][rc:b][qb:a]
(;W[qb];B[re];W[rc];B[md])

(;W[rc]C['A' is correct. 'B' is not recommended.]LB[nc:B][qb:A]
(;B[qb];W[rb];B[nc];W[pb];B[ob];W[qa];B[md];W[ne];B[nd])

(;B[nc]C[White continues with 'a' or 'b'.]LB[qb:b][pb:a]
(;W[pb];B[me]
C[Black 13 can also be at 'a', depending whether Black wants to
emphasise the center or the top.]
LB[md:a])

(;W[qb];B[ob];W[pb];B[md];W[ne];B[nd])
)
)

(;W[re];B[qb]
C['A' -> White is enclosed in the corner, 'B' -> White to right,
Black get the top side.]
LB[qf:B][pb:A]
(;W[pb];B[nc];W[nb];B[pa];W[ob];B[mc];W[mb];B[rf];W[rb];B[lc])

(;W[qf];B[nc];W[pe];B[oe];W[pg];B[of])
)
)

(;B[nc]C[
White continues with 'a', possibly 'b'.
]LB[re:b][nb:a]
(;W[nb]
C[Black continues with 'a' to enlargen the wall. Black 'b' takes the corner for the top side..
]
LB[mb:b][mc:a]
(;B[mc];W[mb];B[lc])

(;B[mb];W[mc];B[nd];W[lb];B[ob];W[ma]
C[Black 'a' and Black yields White 2 and 8 in gote. Black 'b' is
a complete loss.]
LB[pb:b][qc:a]
(;B[qc];W[pb];B[rc])

(;B[pb];W[qc];B[qb];W[rb];B[ra];W[sb];B[re];W[oa];B[sd];W[rc];B[qa];
W[na])
)
)

(;W[re]
C[Black continues with 'a' to emphasize the top, 'b' to secure
the right side.

Black 'a' and White cuts at 'b'.]
LB[nd:b][rf:a]
(;B[rf]C[White continues with 'a'. White 'b' is not recommended.]
LB[nb:b][nd:a]
(;W[nd]C[White's cut provokes a fight.];B[mc]
C[White continues with 'a', possibly 'b'.]LB[md:b][ne:a]
(;W[ne]C[If White chooses to activate the stone for a fight.];B[kd];
W[of];B[pe];W[lf];B[og];W[ng];B[oh])

(;W[md];B[ld];W[nf])
)

(;W[nb]
C[White 12 is not recommended, especially if Black has a favorable
ladder to the top left.]
;B[mb];W[mc];B[nd];W[ob]
C[Black plays 'a' to catch 14 in a ladder, or 'b' if the ladder
is unfavorable.]
LB[lb:b][lc:a]
(;B[lc]C[Assuming Black has the ladder.])

(;B[lb]
C[If Black cannot capture White 14 in a ladder.

The continuation depends upon local support. Without support,
White cannot afford toward the direction of the marked stone.
Typically White would not put White 14 into play until later.]
CR[lc])
)
)

(;B[nd];W[qg])
)
)
)

(;W[qc]C['A *' and 'B *' are joseki.
'C' is tough-minded.]
LB[nc:C][md:B][nd:A]
(;B[nd];W[mc];B[le];W[lc]
C[
* GOOD VARIATION *

There is a small avalanche variation which results in the same
shape of stones, but here the color of the outside wall has sente,
while in the nadare variation it is the color of the upper side
territory.])

(;B[md];W[nd]C['A *' is joseki, 'B' is disadvantageous.]LB[nc:B][ne:A]
(;B[ne];W[nc];B[me];W[lc]
C[
* GOOD VARIATION *

Locally, 'a' is the next play for either player.]
LB[kd:a])

(;B[nc];W[ne];B[nb];W[of];B[pe];W[ob];B[lc];W[pg];B[qg];W[ph])
)

(;B[nc]
C[Black 9 is tough-minded, but the outcomes do not necessarily
favor Black.
One result is giving White influence while struggling for life
underneath - a change from Black's original strategy.
White must reply carefully.

White continues with 'A' or 'B'. White 'C' is submissive.]
LB[nb:C][nd:B][mc:A]
(;W[mc]C[White 10 is a mistake.];B[nb];W[nd];B[lc];W[ne];B[mb];W[of];
B[pe]C['A' is correct, 'B' is nonsense.]LB[pg:B][ph:A]
(;W[ph];B[og];W[ng])

(;W[pg];B[qg];W[qh];B[rf];W[rg];B[rd];W[rc];B[og];W[qf];B[nf])
)

(;W[nd]
C[At best, Black ends up giving White thickness while Black crawls
along the third line to make life of a group started by Black
9.
'A' is correct, 'B' is a mistake.]
LB[nb:B][mc:A]
(;B[mc];W[ne];B[of]
C[White continues with 'a'. White 'b' is a mistake.]LB[ld:b][kd:a]
(;W[kd]C[Black may try 'a' or 'b'.]LB[ob:b][kc:a]
(;B[kc];W[ld];B[lc]
C[White continues with 'a'. White 'b' is a mistake.]LB[jc:b][jd:a]
(;W[jd];B[ic];W[id];B[hc];W[ge])

(;W[jc]C[White 18 is a mistake.];B[jd];W[ic];B[md];W[me];B[le];W[ke];
B[lf])
)

(;B[ob];W[pb];B[le];W[ld];B[md];W[me];B[lf];W[lc];B[lb];W[kb]
C[Black 'a', the only viable play, lets White connect his two groups.

White 'b' and 'c' are the same mistake, and White wins the capturing
race.]
LB[nb:c][mb:b][mf:a]
(;B[mf]C[Black 25 lets White connect his two groups.];W[nb];B[mb];
W[oa];B[nf];W[la];B[oe];W[ma]
C[This quality of this result for either side depends upon surrounding
stones. Certainly if Black wanted thickness, the original strategy,
there was a better way to go about it.])

(;B[mb]
C[Also see variation 3 for a different take on the same mistake.];
W[la];B[na];W[ka];B[mf];W[ma])

(;B[nb]
C[Also see variation 2 for a different take on the same mistake.];
W[oa];B[na];W[pa];B[mf];W[ma])
)
)

(;W[ld]
C[White 14 is a mistake.
'A' or 'B' are correct. 'C' and 'D' are mistakes.]
LB[kb:D][lc:C][md:B][kc:A]
(;B[kc])

(;B[md];W[me];B[le];W[ob];B[kd];W[lf];B[ke];W[mg];B[pj])

(;B[lc]C[Pushing from behind.];W[kd])

(;B[kb]C[Too low.];W[lf])
)
)

(;B[nb];W[of];B[pg];W[ne];B[pe];W[lc])
)

(;W[nb]C[White 10 is submissive.];B[mc])
)
)
)
)

(;B[pc]C[Black must have a ladder off 3 to play this way.];W[pd]
C[Black may continue at 'a *'.
'b' is a trick play.]LB[nc:b][qc:a]
(;B[qc]C[White continues with 'a *'. White 'b' is a mistake.]
LB[nc:b][rc:a]
(;W[rc];B[rb]
C[White continues with 'a' or 'b *'. White 'a' is fighting.
White 'b' is the peaceful variation to avoid all difficulties,
but an unpleasant loss in the local context.]
LB[nc:b][rd:a]
(;W[rd];B[ob];W[nc]C[Black continues with 'a' or 'b'.]LB[sb:b][nb:a]
(;B[nb]C[White continues with 'a' or 'b'.]LB[oe:b][mc:a]
(;W[mc];B[oe];W[sb];B[qb]
C[White continues with 'a'. White 'b' is a tempting mistake.]
LB[mb:b][qg:a]
(;W[qg]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[lc:b][ph:a]
(;B[ph]C[White continues with 'a'. White 'b' is an overplay.]
LB[ld:b][kc:a]
(;W[kc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qf:b][mb:a]
(;B[mb];W[lb]
C[Black continues with 'a'. Black 'b' misses a good moment to peep
at 'a' without reason.]
LB[ma:b][ld:a]
(;B[ld];W[lc];B[ma]
C[White continues with 'a' or 'b'. White 'c' is vulgar.]
LB[qh:c][rh:b][qf:a]
(;W[qf];B[qh];W[rh];B[ri];W[pg];B[og];W[oh]
C[The ladder must be favorable for Black because of White 32.
'A' is correct. Trying to kill on 'B' doesn't work.]
LB[rg:B][ng:A]
(;B[ng]C['A' -> White lives, 'B' -> White dies.]LB[rg:B][sg:A]
(;W[sg];B[oi];W[hc];B[nh]C[Later, Black 'A' is sente.]PL[2]LB[pe:A];
B[pe]
C[White lives on 'A' and dies on 'B'. If White tenuki, Black kills
on 'B'.]
PL[2]LB[qe:B][rf:A]
(;W[rf])

(;W[qe];B[rf];W[re];B[sc];W[sd];B[sf])

(;B[qe];W[re];B[rf];W[rg];B[sc];W[sd];B[sf])
)

(;W[rg];B[qj];W[hc];B[pe]C['A' or 'B' are no help.]LB[sf:B][qe:A]
(;W[qe];B[sh];W[sf];B[sc];W[sd];B[re])

(;W[sf];B[re];W[qe];B[sh];W[se];B[sc])
)
)

(;B[rg];W[rf];B[sh];W[ng];B[of]C['A' or 'B'.]LB[nf:B][mf:A]
(;W[mf];B[nh];W[oi];B[me];W[lf]C['A', 'B', 'C' don't escape.]
LB[le:C][ke:B][kd:A]
(;B[kd];W[ne];B[nf];W[mg];B[nd];W[md];B[le];W[pe];B[ne];W[jd];B[ke];
W[jf])

(;B[ke];W[le];B[md];W[kd])

(;B[le];W[kf];B[jd];W[kd];B[ke];W[je];B[jf];W[ie];B[jc];W[jb];B[nf];
W[mg];B[ib];W[ne];B[nd];W[md])
)

(;W[nf];B[ne];W[me];B[nh];W[oi];B[mf];W[mg];B[md];W[le];B[lf];W[ke];
B[mh];W[lg];B[kf];W[nd])
)
)

(;W[rh]
C[Black continues with 'A' or 'B'. Black 'A' emphasizes the top.
Black 'B' emphasizes the right.]
LB[qh:B][pg:A]
(;B[pg];W[qj];B[hc])

(;B[qh];W[rf];B[qj];W[ri];B[oj];W[hc])
)

(;W[qh]C[White 26 is a vulgar move.];B[re];W[qe]
C[Black continues with 'a' to emphasize the right side, or 'b'
to emphasize the top.]
LB[qi:b][qf:a]
(;B[qf]C[Black plays 29 to emphasize the right side.];W[rf];B[rg];
W[se];B[qi];W[rh];B[ri];W[pi];B[pg];W[sg];B[qk])

(;B[qi]C[Black plays 29 to emphasize the top.];W[qf];B[pi];W[ri];B[rj]
;W[sh];B[hc])
)
)

(;B[ma]C[Black 23 is not too early.];W[qf];B[qh];W[rh];B[ri];W[pg];
B[og];W[oh]C['A' is usual, Trying to kill with White on 'B' fails.]
LB[rg:B][ng:A]
(;B[ng];W[sg];B[oi];W[hc];B[ld]
C[As this peep is played later compared to the more advantageous
variation, White may more likely play tenuki e.g. on 'A'.
Playing 'B' is just saving points without influencing the status
of the Black center group.]
PL[2]LB[lc:B][ed:A]
(;W[ed];B[nh];W[dp];B[lc]C[Later];W[cd];B[jb];W[kb];B[jc];W[jd];B[kd];
W[ic];B[je];W[id];B[ka];W[ib];B[la]
C[Both sides gained the same amount of territory, but White has
an elsewhere move and sente to counter the influence Black developed.])

(;W[lc];B[nh]C[Same result as joseki.])
)

(;B[rg]C[Black 31 is a trick play.];W[rf];B[sh];W[ng];B[of]
C[White continues with 'a'. White 'b' and 'c' are mistakes.]
LB[mg:c][nf:b][mf:a]
(;W[mf]LB[nh:b][md:a]
(;B[md];W[lf];B[ld];W[lc];B[nh];W[oi]C[A and B are miai now.]
LB[kd:B][nd:A])

(;B[nh];W[oi];B[me];W[lf];B[le];W[kf];B[ke];W[je];B[jf];W[kd];B[ni];
W[oj]C[Black may try 'a', 'b' or 'c'. Neither work.]
LB[mg:c][jg:b][kg:a]
(;B[kg];W[jg];B[if];W[mh])

(;B[jg];W[lh];B[ne];W[kh]
C[Black may try 'a' or 'b'. White wins by a move either way.]
LB[sf:b][jd:a]
(;B[jd];W[ie];B[id];W[he];B[jb];W[pe];B[kb];W[nf];B[la];W[ld])

(;B[sf];W[nf];B[re];W[qe];B[se];W[ld];B[sd];W[md])
)

(;B[mg];W[nf];B[kg];W[jg];B[if];W[lg];B[kh];W[lh];B[li];W[ki];B[jh];
W[mi];B[lj];W[nj])
)
)

(;W[nf]
C[White 36 is a mistake.
Black escapes with 'a'. Black 'b' is a mistake.]
LB[ne:b][md:a]
(;B[md];W[ld];B[me]C[White may try 'a' or 'b'. Neither work.]
LB[lg:b][lf:a]
(;W[lf];B[mf];W[mg];B[lg]
C['a' and 'b' are miai. Black is out, and the White group at the
bottom right dies.]
LB[nh:b][le:a])

(;W[lg];B[nh];W[oi];B[mg]C[White may try 'a' or 'b'. Neither work.]
LB[mf:b][mh:a]
(;W[mh];B[mf];W[ni];B[ke];W[le];B[nd];W[lc];B[lf])

(;W[mf];B[le])
)
)

(;B[ne];W[me];B[md]C['A' is correct, 'B' is a mistake.]LB[ld:B][le:A]
(;W[le];B[ld];W[kd];B[nh];W[oi];B[lg];W[mf];B[ke];W[pe])

(;W[ld];B[nh];W[oi];B[mf])
)
)

(;W[mg];B[me];W[lf];B[kd];W[ld];B[le];W[ke];B[kf];W[jd];B[nh];W[oi];
B[lg])
)
)
)

(;B[qf]C[Black 21 is a mistake];W[rf];B[rh];W[rg];B[qh];W[pa])
)

(;W[ld]C[White 20 is an overplay.];B[mb];W[lb];B[kc];W[lc];B[ma])
)

(;B[lc]C[White 19 is not recommended.];W[mb];B[lb];W[me];B[ma];W[ld]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[kd:b][jc:a]
(;B[jc];W[jd];B[ic];W[qh];B[mf]C[If Black tries 29....];W[ke])

(;B[kd]
C[Black 25 is not recommended. White continues with 'a'. White
'b' is a careless mistake.]
LB[ke:b][mf:a]
(;W[mf];B[jc];W[qh])

(;W[ke]C[White 26 is a mistake.];B[md];W[nd];B[ne];W[md];B[mf];W[le];
B[jd])
)
)
)

(;W[mb]
C[White 18 is a mistake. Black continues with 'a'. Black 'b' is
a trick play that can be foiled.]
LB[qe:b][pa:a]
(;B[pa];W[qg];B[jc]
C[Black 21 deprives the White stones of a base. This move is the
reason White 18 is a mistake.]
;W[le];B[ph])

(;B[qe]
C[Black 19 is a trick play. White continues with 'a'. White 'b'
is a mistake.]
LB[pa:b][rf:a]
(;W[rf];B[re];W[se];B[qg];W[pa];B[ra];W[pb];B[rg];W[na])

(;W[pa]C[White 20 is a mistake.];B[ra]
C[White may try 'a' or 'b'. Neither work.]LB[rf:b][pb:a]
(;W[pb];B[re])

(;W[rf];B[re];W[se];B[rg]C[White may try 'a' or 'b'. Neither work.]
LB[sc:b][qf:a]
(;W[qf];B[pe];W[qg];B[sd]
C[Black 29 drives the last nail in White's coffin.];W[sc];B[sa])

(;W[sc];B[oa])
)
)
)
)
)

(;W[oe];B[nd];W[mc];B[md];W[lc];B[ld];W[kc];B[kd];W[jc]
C[Black continues with 'a' to live in the corner, or 'b' for thickness,
while possibly sacrificing the corner.

Black 'c' is a mistake.]
LB[jd:c][qf:b][sb:a]
(;B[sb]C[White continues with 'a' or 'b'.]LB[qg:b][pe:a]
(;W[pe];B[jd];W[id];B[ie];W[hd]
C[Black continues with 'a'. Black 'b' is an overplay.]LB[pg:b][qf:a]
(;B[qf];W[of];B[og];W[ng];B[oh];W[mf])

(;B[pg]
C[Black 29 is an all-out play, but unreasonable. Black must have
the ladder to play this way. White gets and favorable result,
and Black ends in gote.]
;W[nf];B[ng];W[mf];B[mg];W[lf];B[kg];W[lg];B[lh];W[kh];B[kf];W[mh]
C[Black continues with 'a' or 'b'.]LB[of:b][li:a]
(;B[li];W[og];B[nh];W[oh];B[ni];W[ph];B[pj];W[rh];B[jh])

(;B[of];W[li];B[ne];W[pi];B[rf]
C['a' is the vital point of this shape: White's next move, if White
plays in the center.]
LB[ig:a])
)
)

(;W[qg];B[jd];W[id];B[ie];W[hd];B[qf];W[rf];B[re]
C[White continues with 'a'. White 'b' is a mistake.]LB[qe:b][rg:a]
(;W[rg];B[qe];W[of];B[pg];W[pe];B[se];W[mf];B[kf];W[mh];B[pi])

(;W[qe]C[White 32 is a mistake.];B[rg];W[se];B[qh])
)
)

(;B[qf];W[sb]
C[Black continues with 'a', and faces a ko. Black 'b' is a mistake.]
LB[ra:b][qa:a]
(;B[qa]C[Black faces a ko.];W[ra];B[sa];W[pe]
C[Black continues with 'a' or 'b'. Black 'a' is the easy way out.
Black 'b' is tough-minded.]
LB[ng:b][sc:a]
(;B[sc];W[of])

(;B[ng]
C[Black 29 to fight the corner ko. Without other ko threats, Black
loses, but gets thickness, giving what is considered an equal
result.]
;W[ra];B[qb];W[pa];B[sa];W[of];B[og];W[ra];B[pb];W[mb];B[sa];W[sc];
B[re];W[jd];B[nf];W[na]
C[White captures, Black builds thickness. The result is considered
equal.])
)

(;B[ra]C[Black 25 is a mistake; the Black corner stones will die.];
W[pe];B[ng];W[pb];B[qb];W[pa])
)

(;B[jd]
C[Black 23 is a rash mistake.

White continues with 'a'. White 'b' is a mistake.]
LB[id:b][sb:a]
(;W[sb];B[qa];W[ic]C[Now Black faces a ko in the corner.];B[qf]
C[The following is from game 3 of the 1952 Honinbo Title between
Hashimoto Utaro (White) and Takagawa (Black).]
;W[pe];B[ng];W[of];B[og];W[qh];B[re];W[ra];B[sa];W[rg];B[rf];W[ra];
B[qb];W[pa];B[sa];W[se];B[ph];W[ra];B[pb];W[sf];B[qj];W[qi];B[pj];
W[pi];B[oi];W[oj];B[ni];W[rj];B[rk];W[ri];B[ql]
C[The remains unresolved, and the White group at right cannot live
without winning the ko.])

(;W[id]C[White 24 is a mistake.];B[ic]C[Black 25 starts a sacrifice.];
W[hc];B[ib];W[hb];B[jb];W[kb];B[ie];W[hd];B[mb]
C[Now Black lives in the corner.];W[ia];B[qf]
C[Black 35 captures the White stones.];W[pe];B[ng])
)
)
)

(;B[sb]
C[Black 13 is a special strategy, and something of a trick play.];
W[nb]C[Black continues with 'a' or 'b'.]LB[oe:b][pb:a]
(;B[pb];W[oa];B[qa]
C[White continues with 'a'. White 'b' is a mistake.]LB[kc:b][oe:a]
(;W[oe];B[nd]
C[White continues with 'a' to have the White stones at top live,
or 'b' to sacrifice the top White stones for magnificant thickness
on the right and center.]
LB[me:b][lc:a]
(;W[lc]C[Black continues with 'a' to 'c'.]LB[pe:c][ne:b][md:a]
(;B[md];W[pe];B[mf];W[ld];B[ng];W[qg]
C[White 26 is a stylish move that takes care of the White stones

If Black 'a', White 'b'.

White is established on both sides, while Black's center stones
are floating.]
LB[qf:b][of:a])

(;B[ne]
C[White continues with 'a'. White 'b', a sacrifice play, comes
from a professional game.]
LB[of:b][qf:a]
(;W[qf]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[qg:b][pg:a]
(;B[pg];W[qg];B[ph];W[pe];B[nf];W[ri]
C[Black still has the marked point to worry about.]CR[of])

(;B[qg]C[Black 23 is a mistake.];W[of])
)

(;W[of]AB[dq][do]AW[pq][po][dd]
C[White 22 was played by Magari against Nakamura Yutaro in the
1958 4th Top Position Title League.]
;B[pe];W[og];B[pg];W[ph];B[re];W[oh];B[mf];W[qe];B[rf];W[qf];B[qg];
W[rg];B[qh];W[rh];B[qi];W[sf];B[ri];W[se];B[pk];W[jd];B[mh];W[lg];
B[mg];W[ni];B[qm];W[nk];B[jg];W[om])
)

(;B[pe]
C[White continues with 'a' to save the White stones at lower right,
or 'b' to sacrifice those stones to build thickness.]
LB[of:b][qf:a]
(;W[qf];B[pg];W[me];B[ne];W[nf];B[md];W[ld];B[of];W[mc];B[oe];W[qg];
B[ph];W[ri];B[mf];W[le];B[ng]
C[After getting such thickness at top, White does not mind Black's
ponnuki shape.]
;W[qj])

(;W[of];B[md];W[pg];B[qf];W[qg];B[rf];W[rg];B[se];W[og])
)
)

(;W[me]
C[White plays 20 to build thickness (while sacrificing the stones
at top).]
;B[md];W[ld];B[lc];W[ne];B[mc];W[pe]
C['a' is the vital point for either player.]LB[kc:a])
)

(;W[kc]C[White 18 is a mistake.];B[oe];W[qg];B[qf];W[rf];B[re]
LB[qe:B][rg:A]
(;W[rg];B[qe];W[se];B[sd];W[sc];B[pe])

(;W[qe];B[se])
)
)

(;B[oe]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
LB[pb:c][qg:b][oa:a]
(;W[oa];B[qb];W[rf];B[rg];W[qg];B[qf];W[re];B[rh];W[pb]
C[White wins by one move.])

(;W[qg]C[White 16 is a mistake.];B[pb]C['a' and 'b' are miai.]
LB[ld:b][qf:a]
(;W[qf];B[ld])

(;W[ld];B[qf];W[rf];B[re])
)

(;W[pb];B[qb];W[oa];B[qe])
)
)
)

(;W[nc]
C[White 10 is a peaceful reply, and a loss locally.

Black continues with 'a *'. Black 'b' is greedy.]
LB[pe:b][rd:a]
(;B[rd];W[re];B[sc];W[oe];B[qe];W[nd]
C[
* GOOD VARIATION *

Black has a territorial advantage. White kept things simple.
The aji of White 12 disables Black to press hard into the middle.
Black continues with 'A'. 'B' is questionable..]
PL[2]LB[re:12][ng:B][of:A]
(;B[of]C[Later.];W[nf];B[ng]PL[2];W[mg]
C['A' is correct, 'B' is a mistake.]LB[mh:B][nh:A]
(;B[nh];W[mh];B[ni];W[mi];B[nj];W[mf])

(;B[mh];W[og];B[nh];W[qf];B[pe];W[pg])
)

(;B[ng]C[Mistake. 'A' and 'B' punish.]
(;W[of];B[og];W[pg];B[qg];W[ph];B[qh];W[pi]
C[Pushing from behind on 'A' weakens the center stones.
Strengthening the center on 'B' allows White to settle on the
right side.
Jumping on 'A' can be foiled too.]
LB[qj:C][og:B][of:A][ni:B][qi:A]
(;B[qi];W[pj])

(;B[ni];W[rf];B[qf];W[qi];B[rg];W[rh];B[se];W[pm])

(;B[qj];W[qi];B[ri];W[rf];B[qf];W[rh];B[rg];W[rj];B[sh]
C['A' with the ladder. Without perhaps 'B'.]LB[oj:B][qk:A]
(;W[qk])

(;W[oj];B[qk];W[ol];B[qm];W[li])
)
)

(;W[og];B[of];W[nf];B[mf];W[ne]
C['A' gives a disadavantageous position, 'B' a disaster for Black.]
LB[oh:B][pg:A]
(;B[pg];W[oh])

(;B[oh];W[qf])
)
)
)

(;B[pe]
C[Black 11 is a greedy attempt to capture all the White stones
at right.]
;W[rd]C[Black 'a' is better than 'b' or 'c'.]LB[sb:c][sc:b][qe:a]
(;B[qe];W[re];B[rf];W[oe];B[nd];W[of]C['a' and 'b' are miai.]
LB[pg:b][md:a])

(;B[sc];W[sb];B[sa];W[sd]C[Black may try 'a' or 'b'. Neither work.]
LB[qe:b][qb:a]
(;B[qb];W[rf];B[rg];W[re]
C[White 20 is the tesuji to give White enough liberties to win
the ensuing ko.]
;B[ob];W[nb];B[qf];W[oa];B[sf];W[pb]
C[It is White's turn to take ko. Black cannot win this fight with
only local ko threats.])

(;B[qe];W[sb];B[qb];W[ra];B[qa];W[pa];B[sa];W[nd]
C[White's big ko threat.];B[oe];W[ra])
)

(;B[sb]C[Black 13 aims to capture without ko.];W[ob];B[qb];W[rf];B[rg]
;W[qg];B[qf];W[qe]C[Black 'a' and 'b' are both hopeless.]
LB[rh:b][qh:a]
(;B[qh];W[pg];B[og];W[oe])

(;B[rh];W[oe];B[nd];W[of];B[pg];W[og];B[ph];W[md])
)
)
)
)

(;W[nc]
C[White 8 is a mistake.

Black continues with 'A'. Black 'B' is a mistake.]
LB[rd:B][pe:A]
(;B[pe]
C[White may try 'a' or 'b'. White 'b' depends upon a ladder to
work.]
LB[rd:b][rc:a]
(;W[rc]C[Black continues with 'a' or 'b'.]LB[rb:b][rd:a]
(;B[rd];W[qe];B[re];W[qf];B[qg])

(;B[rb];W[rd]
C[See the variation referenced by the numbers, White 10 played
before White 8, for continuation.]
LB[rd:12][pe:11][nc:10][rb:9][rc:8][qc:7][pd:6][pc:5][oc:4][pf:3][qd:2][od:1])
)

(;W[rd];B[rc];W[rf];B[qf];W[re];B[rg];W[qg];B[qh];W[pb];B[qb];W[ob];
B[sf];W[oe];B[nd];W[of];B[og];W[md];B[ne];W[nf];B[me];W[mf];B[le];
W[sb]C[White takes the corner but...];B[lf]
C[... White's center stones are likely forfeit.])
)

(;B[rd]C[Black 9 is too mild.];W[oe];B[re];W[nd])
)
)

(;B[nc];W[ob];B[pb]
C[Black 7 and 9 comprise a famous trick play.
'A' is correct, 'B' and 'C' are mistakes.]
LB[oe:C][nd:B][nb:A]
(;W[nb];B[rc]
C[White punishes with 'A' or 'B'.
'C' only gives an equal result.
'd' is a mistake.]
LB[nd:D][qc:C][mc:B][rd:A]
(;W[rd]C['A' gives Black an inferior result.
'B' loses the corner,]
LB[rb:B][qc:A]
(;B[qc]C['A' or 'B' are the same variation.]LB[mc:B][rf:A]
(;W[rf]C[Neither 'A', 'B' or 'C' give Black a satisfying result.]
LB[nd:C][oe:B][rg:A]
(;B[rg]C['A' is correct, 'B' is inferior.]LB[qg:B][sd:A]
(;W[sd]C[Black takes the right side on 'A' or a small corner on 'B'.]
LB[rb:B][qf:A]
(;B[qf];W[rb];B[re];W[sc];B[pj])

(;B[rb]C['A' is correct, 'B' -> White dies on the right.]
LB[qa:B][qg:A]
(;W[qg];B[qf];W[rh];B[re];W[sg];B[qa])

(;W[qa];B[pa];W[sc]
(;B[sb];W[ra]C[Black kills on 'A' or 'B'.]LB[re:B][qf:A]
(;B[qf];W[sf];B[qh];W[qe];B[pe];W[oa];B[se];W[re];B[sg])

(;B[re];W[qf];B[qg];W[qe];B[pe];W[se];B[sg];W[oe];B[nd];W[pg];B[of];
W[ne];B[sf])
)

(;B[mb];W[nd];B[oe];W[mc];B[lb];W[oa])
)
)
)

(;W[qg];B[qf];W[rh];B[re];W[sg];B[se];W[mc]
C['A' is correct, 'B' is inferior.]LB[nd:B][oe:A]
(;B[oe])

(;B[nd];W[md];B[nf];W[ic]C[White still has the forcing move at 'a'.]
LB[og:A])
)
)

(;B[oe]C['A' is correct. 'B', giving the top stones, is a mistake.]
LB[qg:B][mc:A]
(;W[mc];B[rg]
C['A' is correct 'B' and 'C' are mistakes.
'B' gives three stones to make a position on the right side.
'C' gives a seki and strong Black influence..]
LB[rb:C][qg:B][sd:A]
(;W[sd]
C['A' keeps the corner, but the center stays weak.
'B' gives the corner for the right side.]
LB[qf:B][rb:A]
(;B[rb];W[qg];B[qf];W[rh];B[re];W[sg];B[qa])

(;B[qf];W[rb];B[re];W[sc];B[qk])
)

(;W[qg];B[qf];W[rh];B[re];W[sg]C['A' is correct. 'B' risks a ko.]
LB[sd:B][se:A]
(;B[se])

(;B[sd];W[se]C['A' is correct, 'B' is a mistake.]LB[qe:B][sf:A]
(;B[sf])

(;B[qe];W[sc];B[sb]
C['A' is satisfied to hunt the center stone, 'B' tries to take
the corner with a ko.]
LB[ra:B][sd:A]
(;W[sd];B[ra])

(;W[ra];B[sd])
)
)
)

(;W[rb];B[sb];W[ra];B[pa];W[sd];B[re];W[sc];B[qe];W[sa];B[se];W[oa];
B[pe];W[sb])
)

(;W[qg];B[mc];W[mb]C[White cannot escape.];B[lb]
C['A' or 'B' don't work.]LB[kb:B][lc:A]
(;W[lc];B[kb];W[ld];B[me])

(;W[kb];B[lc];W[la];B[ma];W[na];B[pa];W[ka];B[oa];W[ma];B[jc])
)
)

(;B[nd]
C[White gives stones on the right side with 'A' or the top side
with 'B'.]
LB[qg:B][mc:A]
(;W[mc];B[rg]C['A' is correct,
'B' is inferior.
'C' -> seki.]
LB[rb:C][qg:B][sd:A]
(;W[sd];B[rb];W[qg];B[qf];W[rh];B[re];W[sg];B[qa])

(;W[qg];B[qf];W[rh];B[re];W[sg];B[se];W[md];B[nf];W[ic]
C[White still has the forcing move at A.]LB[og:A])

(;W[rb];B[sb];W[ra];B[pa];W[sd];B[re];W[sc];B[qe];W[oa];B[se];W[sa];
B[pe];W[sb])
)

(;W[qg];B[mb])
)
)

(;W[mc]C['A' is correct, Black cannot capture on 'B', 'C' or 'D'.]
LB[sd:D][pe:C][re:B][oe:A]
(;B[oe];W[rf]C[Same variation as White 14 before White 16.]
LB[mc:14][rf:16])

(;B[re];W[oe];B[nd];W[me])

(;B[pe];W[rf];B[rg];W[re];B[qg];W[rb];B[sc];W[sd];B[sf];W[pa])

(;B[sd];W[rf];B[rg];W[se];B[sc];W[qf];B[qg];W[pe];B[oe];W[of];B[pg];
W[ne])
)
)

(;B[rb];W[mc]C['A' or 'B' don't help.]LB[nd:B][oe:A]
(;B[oe]C['A' or 'B' take the corner,]LB[qf:B][rf:A]
(;W[rf];B[rg];W[pa];B[qc]
C['A' kills the corner.
'B' is recommended by Ishida Yoshio, but a mistake.]
LB[ra:B][qa:A]
(;W[qa]C['A' or 'B' don't help.]LB[ra:B][re:A]
(;B[re];W[qe];B[qf];W[se];B[qh];W[ra]C['A' or 'B' don't help.]
LB[sb:B][sc:A]
(;B[sc];W[sd]
(;B[sg];W[qb];B[sf];W[sb])

(;B[sa];W[oa];B[sg];W[qb])
)

(;B[sb];W[sd];B[sg];W[sa];B[sf];W[sc];B[pe];W[qb])
)

(;B[ra];W[sc];B[sb];W[sd];B[re];W[qe];B[qf];W[se];B[sg];W[oa];B[sf];
W[qb];B[re];W[sa])
)

(;W[ra];B[re];W[sd];B[qa]
C['A' gives a ko, an inferior result.
'B' is recommended by Ishida Yoshio and a mistake, Black lives.]
LB[oa:B][qb:A]
(;W[qb])

(;W[oa];B[sa])
)
)

(;W[qf];B[qg];W[rg];B[rf];W[qe];B[qh];W[rh];B[ri];W[sf];B[qi];W[sd])
)

(;B[nd];W[md]C[After 'A' or 'B', White takes the corner.]
LB[nf:B][pe:A]
(;B[pe];W[rf];B[rg];W[qg];B[qf];W[qe];B[sf];W[re];B[rh];W[oe];B[ne];
W[of];B[pg]
C['A' captures some stone with a net, 'B' captures the left stones
with a ladder.]
LB[nf:B][mf:A]
(;W[mf])

(;W[nf])
)

(;B[nf];W[qf];B[qg];W[rg];B[rf];W[qe];B[rh];W[pg];B[qh];W[of])
)
)
)

(;W[mc];B[nd];W[rd];B[qc]
C[Same variation as White 14 before White 12.]LB[mc:12][rd:14])

(;W[qc];B[qb];W[rb];B[ra];W[sb];B[sc];W[pa];B[sa];W[rb];B[sb];W[oa];
B[rd];W[qa];B[re];W[rb]
C[Black continues with 'a' or 'b'. Black 'a' emphasizes the right
at the expense of the top. Black 'b' gives Black positions at
top and right. 'a' is safe, 'b' -> fight.]
LB[nd:b][oe:a]
(;B[oe];W[mc];B[qb]C[Prevents a White cut on A.]LB[qf:A];W[jc])

(;B[nd];W[qf];B[qe];W[pe];B[qg];W[oe];B[ld]
C[Black is split, but White is still under attack.])
)

(;W[nd];B[oe];W[qc];B[qb];W[rb];B[ra];W[sb];B[sc];W[pa];B[sa];W[rb];
B[sb]C['A' or 'B' don't help.]LB[rd:B][oa:A]
(;W[oa];B[rd]C['A' or 'B' don't help.]LB[qe:B][qa:A]
(;W[qa];B[re];W[rb];B[mc];W[mb];B[lc];W[qb];B[qg];W[lb];B[kc])

(;W[qe];B[re];W[qf];B[qa];W[rf];B[mc];W[mb];B[se])
)

(;W[rd];B[oa];W[na];B[mc];W[mb];B[lb];W[lc];B[md];W[kb];B[re])
)
)

(;W[nd];B[oe];W[nb];B[rc]
C[Same variation as White 12 before White 10.]LB[nb:12][nd:10])

(;W[oe];B[nd];W[pe]
C['A' takes the corner, 'B' is possible to develop the right side.
In both cases White has only a small territory.]
LB[qf:B][rc:A]
(;B[rc])

(;B[qf];W[qb];B[nb];W[qc];B[oa];W[re])
)
)
)
)

(;W[qf]
C[White must have ladder to play this way.

Black continues with 'a *', 'b *' or 'c *'.
If White doesn't have the ladder, 'b *' forces him into an inferior
variation.
Black 'd' gains a big wall, but gives a big corner and is inferior.]
LB[qe:d][qc:c][qg:b][pg:a]
(;B[pg]
C[White continues with 'a *'. White 'b' is willing to give up the
corner for influence over the lower right.]
LB[qg:b][oc:a]
(;W[oc]
C[Black continues with 'a *' or 'b *' for an exchange of White
territory for Black influence. 

Black 'c' gives Black the corner. The exchange is even if White
can use his sente to get an important point, such as nearby the
marked point.]
LB[pc:c][pd:b][nc:a]MA[gc]
(;B[nc];W[pc];B[md];W[qg];B[ph]C[
* GOOD VARIATION *])

(;B[pd];W[pc];B[qc]
C[White continues with 'a *' for a peaceful resolution, or 'b'
to start a fight.]
LB[qe:b][rd:a]
(;W[rd];B[nc];W[qb];B[md]C[
* GOOD VARIATION *])

(;W[qe]
C[White 10 is a good way to start a fight.

Black continues with 'a'. Black 'b' is a mistake.]
LB[rc:b][qb:a]
(;B[qb];W[nc];B[rd];W[re];B[sc];W[qh])

(;B[rc]C[Black 11 is a mistake.];W[qb];B[rb];W[pb]
C[The three Black stones cannot live.];B[qg];W[rd])
)
)

(;B[pc]
C[Black 'c' was an innovation by Yoo Chang-hyuk in the 27th Wangwi.];
W[pd];B[qc]C[White plays 'A', 'B' is a mistake.]LB[oe:B][rc:A]
(;W[rc];B[rb];W[rd];B[ob]
C[White 'a' is the only continuation. White gets a terrible result
with 'b'.]
LB[oe:b][nc:a]
(;W[nc];B[nb]
C[White 'a' is the only continuation. White 'b' is unreasonable.]
LB[oe:b][mc:a]
(;W[mc];B[oe];W[sb];B[qb]
C[White 'a' is correct; 'b' leads to an uphill battle for White.]
LB[qg:b][ld:a]
(;W[ld]
C[Black 'a' is the correct continuation; 'b' is unreasonable and
leads to an approach-move ko.]
LB[qg:b][mb:a]
(;B[mb];W[lb];B[kc];W[lc];B[ma];W[qg]
C[Black continues with 'a'. Black 'b' is slack and gives White
an advantage.]
LB[ph:b][qh:a]
(;B[qh];W[rh]
C[The Black nidan-bane at 'a' is correct. Sealing White in with
a move at 'b' is premature.]
LB[rg:b][ri:a]
(;B[ri];W[ra];B[pa];W[qi];B[ph];W[rj];B[rg];W[si];B[qe];W[rf];B[re];
W[sg];B[se];W[gc]
C[Now White still gets his way, but Black captures the corner.])

(;B[rg]C[Black 29 is a mistake.];W[rf];B[ri];W[sg];B[qi];W[gc]
C[White grabs the point that is important to him.])
)

(;B[ph];W[ri])
)

(;B[qg]C[Black 21 is a mistake.];W[pa];B[qe];W[ra];B[pb];W[mb];B[qa];
W[na];B[sa];W[sc])
)

(;W[qg];B[ld])
)

(;W[oe];B[nd];W[mc];B[md];W[lc];B[ld];W[kc];B[pe])
)

(;W[oe]C[White 14 is a mistake.];B[nc];W[pe];B[qg])
)

(;W[oe];B[nd];W[pe];B[nc];W[ne])
)
)

(;W[qg]
C[In absense of other stones, White 6 gives Black a slightly favorable
result. There may be reasons for White to play this way.
Black can take the corner with 'A', press down from above with
'B' or provoke a cut with 'C'.]
PL[2]LB[qh:C][ph:B][qc:A]
(;B[qc]C[White continues with 'a' or 'b'.]LB[rc:b][ph:a]
(;W[ph];B[pd];W[qe];B[rc]
C[Locally, the result slightly favors Black.

Next, White extends down the right side, at least as far as the
mark.]
CR[qj])

(;W[rc];B[pd];W[qe];B[ph]C[White continues with 'a' or 'b'.]
LB[qh:b][qb:a]
(;W[qb];B[qh])

(;W[qh];B[rb];W[qb];B[pc];W[sb];B[pi])
)
)

(;B[ph]
C['A' is correct. The attempt to eliminate Black's thickness on
the outside like on 'B' fails, except if White has strong positions
in the upper left and lower right corner (in which case Black
3 is already questionable).]
LB[pf:3][ic:B][oc:A]
(;W[oc];B[nc];W[pc];B[md])

(;W[ic];B[qc];W[rc];B[pc];W[rb]
C[If Black is in the upper left, he will first attack the White
stone with 'A'.
Else he will immediately switch to 'B'.]
LB[qh:B][gc:A]
(;AB[dd];B[gc];W[ld];B[qh])

(;AW[ed];B[qh])
)
)

(;B[qh];W[pe];B[oe];W[ph];B[qi];W[oh];B[ng];W[oj];B[pk])
)
)

(;B[qg]C[White cuts at 'a *'. White 'b' is a gross mistake.]
LB[pe:b][pg:a]
(;W[pg]
C[Black continues with 'a *' or 'b'.

Black 'a' gives White the corner while Black takes thickness
while persuing a White center group.

Black 'b' is a powerful fighting method and trick play, and works
whether the ladder is favorable or not.]
LB[of:b][qe:a]
(;B[qe];W[rf]
C[Black plays 'a *', as the ladder should be unfavorable

If White made the mistake to play White 4 without the ladder,
Black punishes on 'b'.]
LB[qf:4][of:b][pe:a]
(;B[pe];W[re]
C[Black continues with 'a *'. 'a' can be regarded as trick play
inviting a mistake.
Black 'b' has also been played professionally. Black 'c' is sometimes
seen in amateur games.]
LB[ph:c][qi:b][qh:a]
(;B[qh]
C['A *' is correct and simple,
'B' is the old joseki, but inferior and gives chances for many
trick play attempts.
'C' leaves the cutting stone in the center heavy.
'D' is being tricked.]
LB[ph:D][qb:C][oc:B][pd:A]
(;W[pd]C['A' is correct, 'B' is inferior endgame.]LB[oc:B][oe:A]
(;B[oe];W[og];B[ob];W[qb];B[pj]
C[
* GOOD VARIATION *

Black has as little influence over the top as possible, so now
the White cutting stones have the best chances.])

(;B[oc];W[og];B[oe];W[qb];B[pj])
)

(;W[oc]
C['A' and 'B' are joseki.
'A' has many mistake continuations.
'C' is a trick play.]
LB[rd:C][nc:B][pd:A]
(;B[pd];W[pc];B[qc];W[rd]
C['A' is joseki, 'B' takes more influence for more territory.]
LB[qb:B][nc:A]
(;B[nc];W[qb];B[md])

(;B[qb]C['A' is correct, 'B' is a mistake.]LB[pb:B][nc:A]
(;W[nc]
C['A' is correct and reverts to a joseki-like position.
'B' leads to various ways of White's superiority.]
LB[rc:B][nd:A]
(;B[nd];W[pb];B[mc];W[rb];B[nb];W[qa];B[ld];W[og];B[pj]
C[Black has now more influence to the top side than necessary.])

(;B[rc]C[White continues with 'a'. White 'b' is a mistake.]
LB[og:b][ph:a]
(;W[ph]C[Black continues with 'a' or 'b'.]LB[rg:b][qi:a]
(;B[qi]C[White continues with 'a'. White 'b' is a mistake.]
LB[pi:b][ng:a]
(;W[ng]C[Black cannot escape. Neither Black 'a' nor 'b' work.]
LB[nf:b][me:a]
(;B[me];W[ne];B[nd];W[md];B[nf];W[of]C[White captures in a snap-back.])

(;B[nf];W[mf];B[me];W[of]C[Neither 'a' nor 'b' work for Black.]
LB[nd:b][ne:a]
(;B[ne];W[nd];B[oe];W[le])

(;B[nd];W[md];B[mc];W[ld])
)
)

(;W[pi]C[White 22 is a mistake. Black escapes.];B[ne])
)

(;B[rg]
C[Black 21 saves the five Black stones, in the process giving White
a great wall in the center while Black takes 20 points in gote.]
;W[qi];B[ri];W[sg];B[rh];W[rj];B[qj];W[pi];B[rk];W[nd];B[of];W[nf];
B[og];W[ng];B[oh];W[pj];B[qk];W[ni];B[sf];W[nh];B[sd])
)

(;W[og]C[White 20 is a mistake.];B[nf])
)
)

(;W[pb];B[nc];W[nb];B[pa];W[ob];B[rc];W[sb];B[md]
C[White loses the top side after 'A' or the right side after 'B'.]
LB[mc:B][sc:A]
(;W[sc];B[mb];W[rb];B[oh])

(;W[mc];B[sc])
)
)
)

(;B[nc];W[pc];B[md];W[og];B[pj];W[mg])

(;B[rd]C['A' is correct. 'B' or 'C' are being tricked.]
LB[pd:C][rc:B][qc:A]
(;W[qc];B[rc];W[rb];B[pc];W[qb];B[nc];W[og])

(;W[rc];B[qc];W[sd];B[pc])

(;W[pd];B[ne];W[rc];B[nc];W[pc];B[ob];W[og];B[pb];W[sd];B[nf];W[pj];
B[qj];W[pk];B[qi]
C[White cannot damage the Black group on the right with 'A' nor
'B'.]
LB[nj:B][qk:A]
(;W[qk];B[oh])

(;W[nj];B[ql])
)
)
)

(;W[qb]C[Black makes thickness on 'A' or 'B'.]LB[pj:B][oh:A]
(;B[oh])

(;B[pj])
)

(;W[ph]
C[Black punishes on 'A' or 'B'.
'A' is light, 'B' solidifies the position in the top right corner.]
LB[pi:B][qi:A]
(;B[qi];W[pi];B[qj];W[qb]C[The White center stones are heavy.])

(;B[pi];W[ng];B[qj]
C[White gets a hunted group after 'A' or a dead corner after 'B'.]
LB[ni:B][pd:A]
(;W[pd];B[ne];W[oc];B[nc];W[pb];B[ob];W[pc];B[ni])

(;W[ni];B[qc];W[rc];B[pd];W[rd];B[qb];W[rb];B[ra];W[rg];B[rh];W[sb];
B[sg];W[sf];B[sd])
)
)
)

(;B[qi]AB[pp][cp]AW[cc][ep]
C[Black 11 is a pattern first played professionally by Otake Hideo
against Ishida Yoshio in the 1974 Meijin league.]
;W[og];B[rg];W[pd]
C[White 14 is an application of a 5-3 joseki, where a similar oder
of moves is produced one line closer to the upper edge.]
;B[oe];W[oc];B[nc];W[pb];B[ob];W[pc];B[md];W[oi];B[pk];W[nb];B[mb];
W[oa];B[lf];W[lh];B[jf];W[lc];B[mc];W[gd])

(;B[ph];W[og];B[qh];W[oc])
)

(;B[of]C[Black must have the ladder to play this way.];W[re];B[ph]
C[This variation is inferior for White, so White will avoid it
and not play White 4 without the ladder.]
LB[qf:4])
)

(;B[of]
C[Black starts a fight. This can be considered a trick play, though
an equal result is possible.

White continues with 'a' or 'b'.
White needs the ladder for 'b'.]
LB[qh:b][pe:a]
(;W[pe];B[rf];W[qe];B[oe]C['A' is correct, 'B' is a mistake.]
LB[qh:B][rg:A]
(;W[rg];B[qh];W[rh];B[qi];W[pc]
C[The red dot point is large for either player, depending on the
importance of the top.]
CR[oc])

(;W[qh];B[rg];W[rh];B[og];W[ph];B[qc]
C['A' is correct, 'B' is a mistake.]LB[re:B][rc:A]
(;W[rc];B[rd];W[pc];B[qb]C['A' is correct, 'B' is a mistake.]
LB[pd:B][re:A]
(;W[re];B[pd];W[sd];B[rb])

(;W[pd];B[re];W[rb];B[pb])
)

(;W[re];B[rd];W[sf];B[rc])
)
)

(;W[qh]
C[Black continues with 'a' or 'b'. Black 'a' is complicated, 'b'
simple.]
LB[qe:b][rg:a]
(;B[rg]C[White continues with 'A'. White 'B' is getting tricked.]
LB[rh:B][rf:A]
(;W[rf];B[rh];W[qi]
C[Black continues with 'a' if the ladder is favorable, 'b' if not.]
LB[ri:b][ph:a]
(;B[ph];W[og];B[pi];W[ri];B[ng])

(;B[ri];W[qj];B[rj];W[qk]
C[Black must continue at 'a'. Black loses with White 'b'.]
LB[qc:b][rk:a]
(;B[rk];W[ql];B[qc];W[rc];B[rb]
C[White continues with 'a'. White 'b' is a mistake.]LB[pc:b][rd:a]
(;W[rd]
C[Black must continue with 'a'. Black cannot afford to play 'b':
he will be one move short.]
LB[qb:b][rl:a]
(;B[rl];W[pc];B[oc];W[qb];B[qm];W[og];B[ng]C[This is an equal result.])

(;B[qb];W[rl];B[pd];W[sk])
)

(;W[pc]C[White 22 is a mistake.];B[qb];W[pd];B[oc];W[pb];B[rd];W[re];
B[sd];W[ob];B[mc];W[mb]C['A' is correct, 'B' is a mistake.]
LB[lb:B][lc:A]
(;B[lc];W[nb];B[rl])

(;B[lb];W[nb];B[lc];W[se];B[sc];W[rl])
)
)

(;B[qc];W[rk];B[rd];W[qe];B[pd];W[rc];B[rb];W[sg];B[pe];W[sj])
)
)

(;W[rh]C[Black continues with 'a' or 'b'.]LB[rf:b][og:a]
(;B[og];W[ph];B[qe];W[rf];B[re];W[sg];B[pd])

(;B[rf];W[qe];B[ph];W[og];B[ng];W[oh];B[pi]
C[White may try 'a' or 'b', neither favorable.]LB[nf:b][re:a]
(;W[re];B[ni];W[sf];B[nh];W[sg];B[oi])

(;W[nf];B[ne];W[nh];B[qi];W[mg];B[me];W[re];B[ri];W[pd];B[oe];W[ob])
)
)
)

(;B[qe]C[White 'a' is better than 'b'.]LB[rf:b][rg:a]
(;W[rg];B[rf]
C[White continues with 'A'. White 'A is tough, but White gets the
corner through ko fights with 'A'.
'B' starts a ko, bad, as in fuseki, there are no ko threats.
'C' is getting tricked.]
LB[qg:C][re:B][pd:A]
(;W[pd];B[oc];W[pe];B[qg];W[oe];B[ne];W[qf];B[re];W[rd];B[qg];W[nd];
B[qf];W[nc];B[pb];W[nb];B[rb];W[qb];B[qc];W[pc];B[ob];W[rc];B[qa];
W[oa];B[qc];W[me];B[nf];W[qb])

(;W[re];B[qg])

(;W[qg];B[pe];W[re];B[rd];W[sf];B[qc])
)

(;W[rf];B[re];W[rg];B[pd])
)
)
)
)

(;W[pe]C[White 6 is the epitome of vulgarity.];B[oe]
C[White 'a' and 'b' are possible continuations. Either way, Black
still gets a favorable outcome.]
LB[rg:b][pg:a]
(;W[pg];B[of];W[qh];B[rg]
C[White continues with 'a', or with a favorable outside ladder,
'b'. White 'c' is a mistake.]
LB[rf:c][rh:b][pi:a]
(;W[pi];B[qc]C[White continues with 'a'. White 'b' is ridiculous.]
LB[rc:b][rf:a]
(;W[rf];B[og];W[ph];B[rd])

(;W[rc]C[White 14 may look tough, but it is suicidal.];B[re];W[qe];
B[rd];W[pc];B[qb];W[pd];B[pb];W[oc];B[nc])
)

(;W[rh]C[White must have the ladder to play this way.];B[rf];W[qe];
B[ph];W[og];B[ng];W[oh];B[pi];W[re];B[ni])

(;W[rf]
C[White would only play 12 if the ladder on the outside were unfavorable.
This variation greatly favors Black.]
;B[rh];W[qi];B[ri];W[qj];B[rj];W[qk];B[qc];W[rc];B[pd];W[rd];B[rk]
C[White continues with 'a'. White 'b' compounds the mistake.]
LB[ql:b][qb:a]
(;W[qb];B[og];W[ph];B[ql]C[White's right side group is in trouble.])

(;W[ql]C[White 24 begins a ko fight that White loses.];B[qb];W[rl];
B[rb];W[sg];B[qe];W[re];B[sc];W[sk];B[sd]
C[A ko fight, but Black wins, as he has the ko threat at 'a'.]LB[og:a]
;W[og])
)
)

(;W[rg];B[pg];W[rh];B[qc];W[rc];B[qb];W[rb]
C[White must play 14 because of the threat of Black 'a'.]LB[re:a]
(;B[jc])

(;B[re])
)
)
)

(;B[qc]C[White continues with 'a *' or 'b'; 'c' is not recommended.]
LB[rc:c][pg:b][re:a]
(;W[re]
C[Black continues with 'a *', possibly 'b' if corner territory
is important.
Black gives the corner for influence on 'c'.]
LB[pg:c][rc:b][pc:a]
(;B[pc];W[pg]C[
* GOOD VARIATION *])

(;B[rc];W[mc];B[oc];W[pg];B[nf];W[jc])

(;B[pg];W[pc];B[pd];W[qb];B[rc];W[rb];B[oc];W[pb])
)

(;W[pg];B[pd]C['A' is correct. 'B' is a mistake.]LB[pe:B][qe:A]
(;W[qe];B[rc];W[qj])

(;W[pe];B[of];W[qh];B[oe];W[qe];B[rc])
)

(;W[rc]C[White 6 is not recommended.];B[pd];W[re];B[pg])
)

(;B[qe]
C['A' is correct. 'B' reverts to a joseki and fails to punish Black.]
LB[re:B][pe:A]
(;W[pe];B[re];W[pd];B[oe];W[rf];B[pg];W[qh];B[oc];W[pb];B[ob];W[qb])

(;W[re];B[pe];W[qg];B[rf];W[rd];B[qh]
C[Same variation as the referneced by the numbers giving a different
order of moves.]
LB[qh:11][rd:10][rf:9][qg:8][pf:7][qf:6][pe:5][re:4][qe:3][qd:2][od:1])
)
)

(;W[tt]
C[White plays elsewhere.
'A' emphasizes the right, 'B' the top side side. Although both
moves are correct local continuations, they might not be the
best moves on the whole board, e.g. a move like 'C' first can
be better timing.]
LB[jc:C][qc:B][re:A]
(;B[re]
C[White continues with 'a *'. White 'b' is a mistake. Playing elsewhere
('c') is unfavorable.
Living on 'd' is also possible, but gives less points.]
LB[qe:d][oc:b][ob:a]
(;W[ob]
C[Joseki continues with Black 'a *'. Black 'b' is not recommended.]
LB[mc:b][pc:a]
(;B[pc]
C[White continues with 'a *'. White 'b' is big, but White loses
aji of a play on the right (threatening to extract White 2).]
LB[pb:b][lc:a]
(;W[lc]C[
* GOOD VARIATION *

Later Black plays 'A' or tenuki.]
LB[jc:A]
(;B[jc];W[pb];B[qc];W[nd];B[ne];W[oc];B[pd];W[md])

(;B[tt]C[Black plays elsewhere.];W[qc]
C[This demonstrates the aji of White 2.];B[pb];W[pd];B[oc];W[qf];B[qe]
;W[pe]C[And White can live or get to the center.])
)

(;W[pb];B[qc]C[White continues with 'a' or 'b'.]LB[nd:b][lc:a]
(;W[lc]C[White has lost the aji of a forcing move at the mark.]CR[rg])

(;W[nd]
C[White 9 was played by Takagawa against Segawa in the 1952 Honinbo
lead.
'A' is correct, 'B' is a mistake.]
LB[ne:B][ld:A]
(;B[ld];W[ne];B[mb]C[Black 12 is a nicely timed forcing move.];W[nc];
B[ic])

(;B[ne];W[oc];B[oe];W[md]C[Too easy for White.])
)
)
)

(;B[mc]
C[Black 6 is not recommended.

White continues with 'a'. White 'b' is also playable, but give
Black better thickness.]
LB[mb:b][pd:a]
(;W[pd];B[oc];W[pb];B[pe];W[nb];B[le];W[rd]
C[Black's thickness is not impressive, and White is nicely settled
considering the move elsewhere.])

(;W[mb];B[lc];W[oc];B[pd];W[qc];B[qe];W[nc];B[nd];W[lb];B[kc])
)
)

(;W[oc]C[White 5 is a mistake.];B[nc]
C[White continues with 'a' to 'c'. White 'c' is somewhat a trick
play.]
LB[nd:c][ob:b][pc:a]
(;W[pc]C[White ends up living in the corner in gote.];B[nb];W[rd];
B[qe];W[pd];B[oe];W[ob])

(;W[ob]C[Black 'a' and 'b' are possible continuations.]LB[nb:b][pd:a]
(;B[pd];W[pc];B[nb]C[White 'a' and 'b' are possible continuations.]
LB[qe:b][rd:a]
(;W[rd];B[qe];W[qb])

(;W[qe];B[qc];W[rc];B[qb];W[rb];B[pb];W[rd];B[qf];W[pe];B[oe];W[rf];
B[rg];W[se];B[qh])
)

(;B[nb];W[pd];B[oe];W[rd];B[qe];W[pc])
)

(;W[nd]
C[White attempts to pull a trick with 7.

Black continues with 'a'. Black 'b' is tolerable if Black has
the ladder, but not recommended. Black 'c' is a mistake.]
LB[pc:c][oe:b][pd:a]
(;B[pd];W[pc];B[nb];W[qe];B[qf];W[rd];B[rf];W[qb];B[ob];W[pb];B[md];
W[ne];B[pe]
C[White must play 'a' to save the corner. Anywhere else is a mistake,
including 'b'.]
LB[me:b][rb:a]
(;W[rb]C[White must play 21 to save the corner.];B[me])

(;W[me]C[White 21 is a mistake.];B[ld]
C[White must play 'a'. White 'b' or anywhere else spells death
for the White corner stones.]
LB[nh:b][rb:a]
(;W[rb];B[le];W[mg])

(;W[nh]C[White 23 is a fatal mistake.];B[rc]
C[Black 24 kills White's corner stones.])
)
)

(;B[oe]
C[Black 8 is only possible if Black has the ladder to the lower
left, but Black 8 is still not recommended: why give an opportunity
for a ladder block if not necessary?

White must play 'a' if the ladder is unfavorable. If White has
ladder, White continues with 'b'.]
LB[mc:b][nb:a]
(;W[nb]
C[White plays 9 when the ladder to the lower left favors Black.];B[mc]
;W[mb];B[lc];W[pc])

(;W[mc]
C[White plays 9 if the ladder is favorable, in which case Black
has made a mistake.]
;B[nb];W[mb];B[ob];W[pc];B[md];W[ne];B[nf];W[me];B[ld];W[pb];B[lf]
C[Black must squeeze, but the result is unsatisfactory for Black.];
W[oa];B[le];W[na])
)

(;B[pc]C[Black 8 is a mistake.];W[ob];B[pd];W[pb];B[qc];W[mc])
)
)

(;W[tt]C[White plays elsewhere a second time, not good at all.];B[ob]
C[White may have played three good points elsewhere, but being
captured like this is unfavorable.])

(;W[qe];B[qf];W[rd];B[pc];W[rf];B[rg];W[se];B[qh];W[rb])
)

(;B[qc];W[re];B[rc];W[qg])

(;B[jc])
)

(;W[rf]C[White 4 is a half-hearted move; White is too low.];B[qc];
W[rc];B[pc]C[White continues with 'a'. White 'b' is a mistake.]
LB[rb:b][qh:a]
(;W[qh];B[kc])

(;W[rb]C[White 8 gives White a needlessly low position.];B[qe]
C[White 'a' is bad enough. White 'b' is worse.]LB[rd:b][re:a]
(;W[re];B[pd];W[rd];B[kc])

(;W[rd];B[ph])
)
)
)

(;B[pg]
C[
Oogeima = Nunmokcha = Da` Fei = Large Knight's Move
----------------------------------------------------

Black presses on a large scale with 3, like a samurai brandishing
a sword. Black aims at an immediate lead, so White must be cautious.

White best response is to play elsewhere ('a'), but may locally
continue with 'b *'. White 'c' is possible.
]
LB[oc:c][qf:b][dp:a]
(;W[tt]
C[White's best response is to play elsewhere. Black follows up
with 'A' to emphasize the top or 'B' to emphasize the right side.]
LB[qf:B][qc:A]
(;B[qc]
C[White continues with 'a' to 'c'. White is confined to the corner
with 'a', and escapes to the side with 'b' or 'c'. White 'b'
leaves some thinness for White.]
LB[qf:c][re:b][rc:a]
(;W[rc];B[pc];W[re];B[qf];W[rf];B[rg];W[qh];B[qg];W[qb];B[pb];W[rb])

(;W[re];B[rc];W[qh])

(;W[qf]C[Black continues with 'a' or 'b'.]LB[pf:b][pd:a]
(;B[pd];W[re];B[rc];W[qh])

(;B[pf];W[rc];B[pc];W[re])
)
)

(;B[qf]
C[White continues with 'a' to live in the corner, or 'b' or 'c'
to sacrifice the corner for a postion at top.]
LB[oc:c][ob:b][pc:a]
(;W[pc];B[oc];W[ob];B[nb];W[pb])

(;W[ob];B[pc];W[pb];B[qc];W[lc])

(;W[oc]C['A' or 'B'.]LB[nc:B][pc:A]
(;B[pc];W[pd];B[qc];W[rc];B[rb];W[ob];B[rd];W[qb];B[sc];W[pb];B[rc];
W[nd];B[oe];W[kc])

(;B[nc];W[pc];B[nd])
)
)
)

(;W[qf]C[Black continues with 'a' or 'b *'.]LB[qg:b][pf:a]
(;B[pf];W[oc];B[nc];W[pc];B[md];W[qg];B[ph])

(;B[qg]C['A *' is correct, 'B' is possible.]LB[oe:B][pf:A]
(;W[pf]C['A *' is correct. 'B' is a trick play.]LB[og:B][of:A]
(;B[of];W[og];B[nf];W[oh];B[qi];W[pi];B[rh];W[qj]C['A *' or 'B'.]
LB[rj:B][rf:A]
(;B[rf];W[re];B[rj];W[qk];B[rk];W[ql]C[
* GOOD VARIATION *];B[qc]
C[Black cannot kill.];W[rc];B[pc];W[sf];B[rg];W[rb];B[sd];W[se];B[qb];
W[ra])

(;B[rj];W[qk];B[rk];W[ql];B[qc]C['A' is correct, 'B' is questionable.]
LB[rf:B][rc:A]
(;W[rc];B[pc];W[rf];B[rl];W[qm];B[si];W[rb];B[kc])

(;W[rf];B[rd];W[qh];B[ph];W[rg];B[qh];W[sh];B[ri];W[oj];B[qe];W[rl];
B[ni];W[oi];B[pe];W[sk];B[re];W[sj])
)
)

(;B[og]
C[White is alive in the corner and mustn't continue to enlargen
it, because that will only give Black a big wall.
But Black is two moves behind: a connection of his stones and
an extension. White uses this on 'A' or 'B'.]
LB[ld:B][pk:A]
(;W[pk];B[qc];W[rc];B[pc];W[re];B[rg];W[rb];B[lc];W[ne])

(;W[ld];B[qc];W[rc];B[pc];W[re];B[pk];W[ne])
)
)

(;W[oe]
C['A' is correct, 'B' emphasizes the top side, and should be played
only Black has already an extension on either the top or right
side. 'C' is a mistake.]
LB[ne:C][nd:B][pe:A]
(;B[pe]
C[In any coming result, the exchange of the triangled stones is
bad for White.]
TR[qg][qf];W[pd];B[ne]
C[White continues with 'a'. White 'b' is a mistake.]LB[of:b][oc:a]
(;W[oc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[nd:b][of:a]
(;B[of];W[nc]C[Black 'a' and White 'b' are large points that remain.]
LB[rf:b][qe:a])

(;B[nd]C[Black 11 is a mistake.];W[nc];B[ld];W[mc];B[lf])
)

(;W[of]C[White 10 is a mistake.];B[pf];W[oc];B[nd];W[nc];B[ld];W[mc];
B[lf]
C[Black's thickness is superior to White's territory. The two White
stones are forfeit.])
)

(;B[nd];W[of];B[og];W[mf])

(;B[ne];W[of];B[pd];W[qe])
)
)
)

(;W[oc];B[pc];W[pd];B[qc]LB[ob:A][rc:B]
C['A' is simple, but White needs the ladder, 'B' is complicated.
]
(;W[ob]
C[
If you are high-dan and know the follow-up. mail it to me please: kogo@waterfire.us.
]
;B[rd];W[rc]LB[qe:A][rb:B][re:C]
C['A' starts the ladder, if White made the mistake not having it.
'B' is ok.
'C' is not recommended, because Black ends in gote still needing an extension move.
Still, after 'C' Black gets influence, while White gets a small corner with few possibilities to enlarge it.
]
(;B[qe];W[pe];B[oe];W[pf];B[qf];W[of])

(;B[rb];W[sc];B[sd];W[qb];B[sb];W[rc];B[sc];W[pb];B[rc]LB[oe:A][qf:B]
C['A' is correct, 'B' is wrong.
]
(;W[oe]LB[qe:A][pe:B][nd:C]
C['A' is correct, 'B' is disadavantageous.
Going out is usually best, but here 'C' is bad.
]
(;B[qe];W[nd];B[qk]LB[ic:A][qf:B]
C['A' is correct, 'B' has no result.
]
(;W[ic])

(;W[qf];B[pf];W[re];B[pe];W[se];B[od])
)

(;B[pe];W[nd];B[qe];W[ic];B[qk]LB[pe:21]
C[Black 21 is an unneccesary move losing sente.
])

(;B[nd];W[qf];B[pe];W[qe];B[pf];W[qg];B[ph];W[qh];B[pi]LB[qi:A][mc:B]
C['A' or 'B'.
]
(;W[qi];B[pj];W[mc])

(;W[mc];B[qi];W[re];B[rh];W[se];B[rg];W[ra];B[sf];W[sa])
)
)

(;W[qf];B[qe];W[pe];B[pf];W[oe];B[re];W[nd];B[qh];W[ic])
)

(;B[re];W[qb]LB[oe:A][pe:B]C['A' or 'B' are the same.
]
(;B[oe])

(;B[pe];W[pb];B[oe])
)
)

(;W[rc];B[rb];W[rd];B[ob];W[nc];B[nb]
C[White 'A' is ok, White 'B' is disadvantageous.]LB[mc:B][oe:A]
(;W[oe];B[nd];W[mc];B[md];W[lc];B[ld];W[kc];B[kd];W[jc]
C[Black continues with 'A'. Black 'B' is possible.]LB[sb:B][jd:A]
(;B[jd]
C[White continues with 'A'. White 'B' is a mistake. 'C' is questionable.]
LB[id:C][sb:B][ic:A]
(;W[ic];B[sb];W[nf];B[ng])

(;W[id];B[ie];W[hd];B[sb];W[nf];B[ng])

(;W[sb];B[ic]C['A', 'B' or 'C' don't help.]LB[ra:C][pb:B][qb:A]
(;W[qb];B[pb];W[ra];B[jb])

(;W[pb];B[qb];W[ra];B[pa];W[sa];B[qa];W[sc];B[jb])

(;W[ra]C['A' is correct, 'B' is wrong.]LB[qb:B][pb:A]
(;B[pb];W[qb];B[jb])

(;B[qb];W[qa];B[pb];W[mb])
)
)
)

(;B[sb];W[nf];B[jd];W[id];B[ie];W[hd];B[of];W[pf];B[og];W[ne];B[ng];
W[lf];B[kg]C[Keeping 'a' in reserve is a tesuji.]LB[mg:a];W[qg];B[qh];
W[rg];B[rh];W[rf];B[lg];W[sg]
C[White must play 42 or Black 'a' kills him.]LB[qe:a])
)

(;W[mc];B[oe];W[sb];B[qb];W[rg];B[rh];W[qg];B[qh];W[pf];B[of];W[pe];
B[og];W[rf]
C[Having to make life in gote is painful. White's three stones
at top will suffer.])
)
)
)

(;B[qf]
C[
Ikken Basami = Hankan Hyeopgong = Yi Jia = 1-Space Low Pincer
--------------------------------------------------------------

Black 3 is a special approach when Black is strong in the surrounding
area, or a trick play.
'A' is correct, 'B' is getting tricked.
]
PL[2]LB[oc:B][pe:A]
(;W[pe]C['A' is correct, 'B' and 'C' are mistakes.]
LB[pg:C][ne:B][qc:A]
(;B[qc];W[rc];B[pc];W[re]
C[Black continues with 'a' or 'b'. Black 'c' is not recommended.
Black 'd' is a simple trick move.]
LB[of:d][md:c][kc:b][pg:a]
(;B[pg]C[White continues with 'a' or 'b'.]LB[pf:b][oe:a]
(;W[oe];B[md];W[ne];B[lc];W[ng])

(;W[pf];B[og]C['A' is correct, 'B' fails to capture on the top side.]
LB[qg:B][nf:A]
(;W[nf];B[of];W[oe];B[ne];W[qg];B[qh];W[nd];B[me];W[nc];B[rg];W[pd])

(;W[qg];B[qh];W[rg];B[rh];W[rf])
)
)

(;B[kc]
C[Black 9 renders the pincer meaningless, but the local result
is equal.]
;W[oe];B[nd];W[qh])

(;B[md]
C[Black 9 is not recommended, as White easily settles his group.];
W[qg]
C[White 10 is a tesuji that settles his group. White can now aim
to play at 'a', so Black must extend to cover that. White can
be satisfied to end in sente.]
LB[kc:a])

(;B[of]C[Black 9 is the simplest of trick plays.];W[oe];B[ne];W[pf];
B[pg]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
LB[nf:c][og:b][qg:a]
(;W[qg];B[og];W[qh];B[md])

(;W[og]C[White 14 is a mistake.];B[qe])

(;W[nf]C[White 14 is a mistake.];B[qe])
)
)

(;B[ne];W[pf];B[pg];W[qg];B[qh];W[rg];B[ph];W[rf]
C[Black's thin center position doesn't equal White's territory.])

(;B[pg];W[oe];B[md];W[ne];B[nd];W[ng]
C[Black can defend only one side, White can pincer on the other.])
)

(;W[oc];B[pc];W[pd]C['A' is correct, 'B' loses a semeai.]
LB[qc:B][nc:A]
(;B[nc];W[ob];B[pb]C['A' is correct, 'B' is not recommended.]
LB[oe:B][nb:A]
(;W[nb];B[rc]C[White 'A' or 'B' don't help.]LB[rd:B][qc:A]
(;W[qc];B[qb];W[rb];B[ra];W[sb];B[sc];W[pa];B[sa];W[rb];B[sb];W[oa];
B[rd];W[qa];B[oe];W[rb];B[qb]
C[Black must recapture to make White moves onto A or B useless.]
LB[re:B][pf:A];W[mc];B[kc])

(;W[rd];B[qc]C['A', 'B' or 'C' don't help.]LB[pf:C][mc:B][pe:A]
(;W[pe];B[oe];W[pf];B[of]C['A' or 'B' don't help.]LB[og:B][pg:A]
(;W[pg];B[mc];W[mb];B[lb])

(;W[og];B[mc];W[mb];B[pg];W[qg];B[ph];W[rf];B[qh];W[rg];B[lc];W[lb];
B[kb];W[jb];B[kc];W[ka];B[la];W[ma];B[jc];W[ib];B[ja];W[ia];B[oa];
W[ic];B[pa];W[ja];B[rh]
C[Later, Bäack can secure his corner on A attacking the life of
the White group.]
LB[sc:A])
)

(;W[mc];B[oe];W[rf];B[rg];W[qg];B[pg];W[qh];B[re];W[pf];B[sf];W[pe];
B[of])

(;W[pf];B[pe]C['A' is less bad than 'B'.]LB[nd:B][oe:A]
(;W[oe];B[nd];W[qg];B[mb])

(;W[nd];B[oe];W[mc])
)
)
)

(;W[oe];B[nd];W[qb];B[nb];W[qc];B[oa];W[pf];B[pg];W[og];B[ph]
C[Later, Black A is sente, so White does not yet live.]LB[re:A])
)

(;B[qc];W[rc];B[rb];W[rd];B[ob];W[nc];B[pe];W[rf];B[oe];W[nb];B[rg];
W[sb];B[qb];W[pa];B[re];W[pb])
)
)

(;B[qg]
C[
Nikken Basami = Dukan Hyeopgong = E`r Jia = 2-Space Low Pincer
---------------------------------------------------------------

White continues with 'A *', 'B', 'C' or 'D'.
]
LB[qf:D][pf:C][pe:B][oc:A]
(;W[oc]C['A *' is simple, 'B' complicated.]LB[pc:B][nc:A]
(;B[nc];W[pc];B[nd]C['A *' is ok, 'B' is bad.]LB[pf:B][pe:A]
(;W[pe]C['A *' or 'B'.]LB[of:B][og:A]
(;B[og]C[
* GOOD VARIATION *])

(;B[of]C[Later, Black has A.]PL[2]LB[re:A])
)

(;W[pf];B[qe])
)

(;B[pc];W[pd];B[qc]C['A' wants the right, 'B' the top side.]
LB[nc:B][rc:A]
(;W[rc];B[rb];W[rd];B[ob];W[nc];B[pe]
C['A' is possible, 'B' is questionable.]LB[nb:B][oe:A]
(;W[oe];B[nd];W[pf];B[ne];W[of];B[mc])

(;W[nb];B[qe];W[qb];B[pb];W[ra];B[qa];W[sb];B[sa];W[oe];B[nd];W[ra];
B[md];W[qb];B[mb];W[pa];B[mc];W[oa]
C[White took 13 points in the corner, they don't equal White's
influence.])
)

(;W[nc];B[rd];W[re];B[rc];W[oe];B[qe];W[nd];B[pe];W[of];B[pg])
)
)

(;W[pe]
C[Black continues with 'a' or 'b'. Black 'a' leaves options for
later play. After Black 'b' Black 3 is in a badposition. Both
moves end with Black sente.]
LB[qg:3][qc:b][og:a]
(;B[og];W[oe];B[md];W[ne])

(;B[qc]C[tsuke-hiki (attach to draw back)];W[rc];B[pc];W[re];B[og];
W[oe];B[md];W[me];B[ld];W[pj])
)

(;W[pf]C[Black may try 'a' or 'b'. Black 'b' abandons Black 3.]
LB[qc:b][pg:a]
(;B[pg]C['A' is correct, 'B' is a mistake.]LB[of:B][oc:A]
(;W[oc]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[pc:b][nc:a]
(;B[nc];W[pc];B[nd];W[qf]C['A' or 'B'.]LB[og:B][of:A]
(;B[of]C[There is later the cutting point at 'a'.]LB[og:a])

(;B[og])
)

(;B[pc];W[pd];B[qc]C[White may continue with 'a' or 'b'.]
LB[rc:b][nc:a]
(;W[nc];B[rd];W[oe];B[re];W[nd])

(;W[rc];B[rb];W[rd];B[ob];W[nc];B[nb];W[mc])
)
)

(;W[of];B[qf];W[pe];B[md])
)

(;B[qc]C[tsuke-hiki (attach to draw back)];W[rc];B[pc];W[qf];B[rb];
W[qi])
)

(;W[qf]C['A' or 'B'.]LB[pg:B][pf:A]
(;B[pf];W[pg]
C[See the variation where 5 is played before 3 for this joseki.]
LB[pf:5][qg:3])

(;B[pg];W[oe])
)
)

(;B[re]
C[
Hikui Katatsuki = Low Shoulder Attack
-----------------------------------------

White 'A' is correct and disadvantageous for Black. White 'B'
leads to a low position. White 'C' is being tricked the most.
]
LB[pe:C][qe:B][pd:A]
(;W[pd]C['A' or 'B'.]LB[oc:B][oe:A]
(;B[oe];W[qf];B[pf];W[rf];B[pg];W[qh];B[oc];W[pb])

(;B[oc];W[pf]C['A' is correct, 'B' makes it worse for Black.]
LB[qg:B][oe:A]
(;B[oe];W[qf];B[qb])

(;B[qg];W[qf];B[rf];W[nf];B[ld];W[qi])
)
)

(;W[qe];B[qf]C[White continues with 'a' or 'b'. 'c' is inferior.]
LB[rd:c][pe:b][pf:a]
(;W[pf];B[pe]
C[White 'a' yields an equal result. White 'b' results in a big
ko, the outcome uncertain.]
LB[qg:b][rf:a]
(;W[rf];B[qg];W[rg];B[qh]
C['A' is correct, 'B' is too anxious.
'C' gives Black profit.]
LB[of:C][rd:B][rh:A]
(;W[rh];B[of]C[White continues with 'a' or 'b'.]LB[pd:b][qi:a]
(;W[qi];B[qc];W[rd];B[pg];W[pc];B[oc];W[qb];B[pb];W[rc])

(;W[pd];B[pg];W[oc];B[nd];W[nc];B[mc];W[pc];B[ld])
)

(;W[rd];B[of])

(;W[of];B[rd];W[qc];B[rc];W[qb];B[rh];W[oe];B[md];W[oc])
)

(;W[qg];B[rf]C['A' is correct, 'B' is a mistake.]LB[pg:B][rg:A]
(;W[rg];B[rd];W[qc];B[rc];W[rb];B[qb];W[pb];B[qa]
C[White continues at 'a'. White 'b' is a mistake, as White ends
in a big loss.]
LB[pa:b][pc:a]
(;W[pc];B[sb]
C['A' makes a ko, 'B' takes thickness and sente for territory.]
LB[nc:B][oe:A]
(;W[oe];B[of];W[pd];B[pg];W[ne];B[pe])

(;W[nc];B[pg];W[of];B[ph];W[nd];B[qj])
)

(;W[pa];B[pc];W[ra];B[qb];W[qa];B[of];W[pg];B[ob]LB[sf:B][sb:A]
(;W[sb];B[pd];W[qb];B[oa];W[sf];B[sc];W[se];B[sa])

(;W[sf];B[pd];W[qb];B[oa];W[se];B[sb])
)
)

(;W[pg];B[rg];W[rh];B[qc];W[rd];B[rc];W[pd];B[pc];W[oe];B[sd];W[pe];
B[nd]C[Aji for Black on A.]LB[qh:A])
)
)

(;W[pe]C[This normally bad shape is a calm play here.];B[rd];W[qc];
B[ne];W[pf];B[qg];W[nf];B[mf];W[ng]
C[Black continues with 'a'. Black 'b' invites a cut at 'a' and
a subsequent loss.]
LB[qj:b][me:a]
(;B[me];W[qi])

(;B[qj];W[me];B[le];W[md];B[ld];W[mc];B[lc];W[lb];B[kb];W[nb])
)

(;W[rd];B[pf];W[oc];B[nc];W[pc];B[nd]
C[Without the marked stones the situation would be joseki, their
exchange is bad for White.]
TR[qf][qe])
)

(;W[pe]C[White 4 is a mistake.];B[qc]
C[White 'a' and 'b' both give bad results for White.]LB[rd:b][rc:a]
(;W[rc];B[rd];W[pc];B[qb];W[pd];B[rb])

(;W[rd];B[rc];W[rf];B[pd];W[qe];B[lc])
)
)

(;B[pd]LB[qc:A][qe:B]C['A' or 'B' give White a favorable result.
]
(;W[qc];B[qe];W[re];B[qf];W[rf];B[qh];W[qg];B[pg];W[rg];B[oh];W[ob];
B[nc];W[nb];B[lc];W[ri]
C[Black failed to close one side to the second line.
])

(;W[qe];B[qc];W[rc]LB[rb:A][pb:B]C['A' or 'B'.
]
(;B[rb];W[qb];B[pc];W[sb];B[pf]LB[ra:A][jd:B]
C[White has the choice to put Black's influence to the top with 'A' or the right with 'B'.
]
(;W[ra];B[jd];W[qf];B[pg];W[qh])

(;W[jd];B[rd];W[ra];B[re];W[qf];B[qg];W[rf];B[rg];W[sd];B[pe];W[se];
B[oh])
)

(;B[pb];W[qb];B[pc];W[qh];B[kd])
)
)
)

(;W[qc]
C[
San-san
--------

White plays the 3-3 when Black has a stone at top such as marked.

Black continues with 'a *' to 'c'.
Black 'd' is possible, but not recommended.

Outcomes:
'a' - White corner, Black thickness.
'b' - White on the right, Black top.
'c' - White corner, Black sente.
'd' - Black choice; ladder is important.
]
LB[qd:d][pe:c][pc:b][qe:a]TR[jc]
(;B[qe]
C[
Keima = Narincha = Fei = Knight's Move
---------------------------------------

White lives in the corner. Black gets thickness.
'A' or 'B'.
]
LB[pd:B][oc:A]
(;W[oc]C['A' or 'B' are ok.]LB[nc:B][nd:A]
(;B[nd];W[re];B[qf];W[nc];B[md];W[rf];B[qg];W[pd];B[pe];W[qd])

(;B[nc]C['A' is ok, 'B' is questionable.]LB[nd:B][pd:A]
(;W[pd];B[pe];W[nb];B[nd];W[mb];B[rc]C[Later];W[rb];B[pb];W[pc];B[rd];
W[qb])

(;W[nd];B[pc];W[ob]
C['A' starts a fight and gives White a small corner. 'B' needs
the ladder.]
LB[oe:B][pd:A]
(;B[pd];W[pb];B[mc]C['A' is correct, 'B' is wrong.]LB[rd:B][re:A]
(;W[re];B[rf];W[rd];B[qg];W[ne];B[kd];W[ng]
C[The White corner is small.])

(;W[rd];B[re];W[ne];B[ld]
C[Now, 'A' is necessary. After 'B' the White corner dies.]
LB[ng:B][rb:A]
(;W[rb];B[og])

(;W[ng];B[rb];W[qb];B[ra];W[rc];B[nb];W[sb];B[sd];W[oa];B[qa])
)
)

(;B[oe];W[pb];B[md])
)
)
)

(;W[pd];B[pe];W[oc]
C[White 4 and 6 may also be played in different order.]LB[pd:4][oc:6];
B[nc]
C[
* GOOD VARIATION *

White continues with 'a'. White 'b' is vulgar.]
LB[nd:b][nb:a]
(;W[nb]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[mc:b][nd:a]
(;B[nd];W[mb];B[rc]C[Black 11 is post-joseki.];W[rb];B[pb];W[pc];B[rd]
;W[qb])

(;B[mc]C[Black 9 is not recommended.];W[mb]
C['A' is correct, 'B' is a mistake.]LB[ob:B][lc:A]
(;B[lc]
C[White has sente, and Black is left with the cutting point at
'a'.]
LB[oe:a])

(;B[ob];W[pc];B[lb];W[nd]C['A' or 'B'.]LB[oe:B][ma:A]
(;B[ma];W[oe])

(;B[oe];W[lc];B[md];W[ld];B[me];W[kb])
)
)
)

(;W[nd]C[White 8 is insensible. This move helps Black fix his shape.];
B[oe]
C[White continues with 'a'. White 'b' may be played if there is
no Black extension (as shown).]
LB[mc:b][nb:a]
(;W[nb]AB[jc]
C[White plays 10 is Black has an extension at top as shown.];B[mc];
W[mb];B[lc]
C[Black has superior thickness. White 8 is no threat; better to
have reserved the cutting point at Black 9, like in the variation
without these two stones.]
LB[nd:8][oe:9])

(;W[mc]C[White may try 10 if there is no Black stone at top.];B[nb]
C['a' is ok, 'b' is ok with the ladder, 'c' is not recommended.]MA[jc]
(;W[ld]MA[jc];B[rc]C['A' is correct, 'B' is a mistake.]LB[rb:B][ob:A]
MA[jc]
(;W[ob]MA[jc];B[ne]MA[jc];W[md]MA[jc];B[qb]MA[jc])

(;W[rb];B[pb];W[pc];B[qb])
)

(;W[mb];B[ob];W[pc];B[md];W[ne];B[nf];W[me];B[ld];W[pb];B[lf])

(;W[ob];B[mb];W[lc];B[lb];W[kc];B[kb];W[jc];B[rc];W[rb];B[qd];W[qb];
B[jb]C['a' is correct, 'b' makes the mistake larger.]
(;W[rd];B[ne];W[md];B[ic])

(;W[ic];B[rd];W[ib];B[pc];W[pb];B[sb];W[ja];B[oa];W[na];B[ma];W[ka];
B[ra];W[ia];B[qa];W[pd];B[pa];W[ne])
)
)
)
)
)

(;B[pc]
C[
Kosumi-Tsuke = Diagonal Attachment
--------------------------------------

Black must have a stone at top to play this way.
White 'A' or 'B' are possible.
]
LB[qe:B][qd:A]
(;W[qd]C[Black continues with 'a' or 'b'.]LB[pe:b][of:a]
(;B[of]C[ikken tobi (1-space jump)];W[qg])

(;B[pe]
C[
Kata-tsuki = Diagonal attack
------------------------------

'A' is correct, 'B' is questionable.]
LB[qe:B][rf:A]
(;W[rf]C[Black continues with 'a'. Black 'b' is an overplay.]
LB[qg:b][pg:a]
(;B[pg];W[qh])

(;B[qg]
C[Black 7 is an overplay. A fight ensues.

White continues with 'a'. White 'b' is timid.]
LB[rg:b][qf:a]
(;W[qf];B[pf];W[pg];B[qh];W[og]
C[Unless Black has support, the fight favors White.])

(;W[rg]C[White 8 is faint-hearted.];B[qh]
C[White 'a', Black 'b', the White cut of 'c' is not longer much
of a threat.]
LB[pg:c][pf:b][qf:a])
)
)

(;W[qe];B[pf])
)
)

(;W[qe]C[Same variation as Black 1 and 3 played in reverse.]
LB[od:1][pc:3];B[qb];W[qd];B[ob];W[qh])
)

(;B[pe]
C[
Kosumi = Ibkucha = Jian = Diagonal
-----------------------------------

Black 3 seems vague, as it does not much affect White 2, but
is a steady move to create thickness. Further, White does not
have an easy continuation.

Black plays this way to get sente.

Locally, White continues with 'a' or 'b'. White can consider
these two points miai, and play elsewhere ('c').
]
LB[dp:c][re:b][ob:a]
(;W[ob];B[qd]
C['A' goes outside. 'B' and 'C' are enclosed in the corner.]
LB[rc:C][pc:B][mc:A]
(;W[mc];B[pc];W[pb];B[qb];W[rc];B[rb];W[oc];B[pd];W[nd])

(;W[pc]
C[The joseki ends.

Black continues at 'a' locally, or extends down the right side.

Black 'c' is an overplay.]
LB[nb:c][qi:b][mc:a]
(;B[mc]C[Black 7 is a logical continuation at top.])

(;B[qi]C[A possible Black extension on the right.])

(;B[nb]C[Black 7 is a mistake.];W[nc];B[oc];W[mb];B[pb];W[na];B[qb];
W[nd]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[ne:b][rc:a]
(;B[rc];AB[jc]
C[With the marked previous stone the joseki was a mistake in direction.]
TR[jc])

(;B[ne]
C[Black 15 is a mistake because the aji of the two White stones
can result in a huge ko or outright loss.]
;W[rc]C[White 16 leads to a favorable ko for White at worst.];B[rb]
C[White continues with 'a' or 'b'.]LB[rd:b][pd:a]
(;W[pd];B[oe];W[rd]C[Black continues with 'a' or 'b'.]LB[re:b][qe:a]
(;B[qe];W[re];B[rf]
C[White continues with 'a'. White 'b' is a mistake.]LB[sb:b][sf:a]
(;W[sf]
C[Black 'a' gives a ko favorable to White. 

Black 'b' leads to an outright loss for Black in the corner,
but preserves influence. 

Black 'c' is an outright mistake.]
LB[sc:c][rg:b][sg:a]
(;B[sg]C[Black 25 gives a ko favorable to White.];W[rg];B[se];W[qf];
B[sc];W[sf]
C[White wins, as connecting at the marked spot gives White the
corner and destroys Black's thickness.]
CR[rf])

(;B[rg]
C[Black 25 gives away the three stones, but preserves influence.];
W[sb];B[ra]
C[Black 27 gives Black the most liberties possible.

White continues with 'a'. White 'b' is a mistake.]
LB[sc:b][pa:a]
(;W[pa];B[se]
C[White continues with 'a' or 'b'. White 'c' is a mistake.]
LB[sd:c][sc:b][oa:a]
(;W[oa])

(;W[sc];B[sg];W[oa];B[sf];W[qa])

(;W[sd]C[White 30 is a mistake.];B[sg];W[oa];B[se]
C[White must find a ko threat.])
)

(;W[sc]C[White 28 is a mistake.];B[pa]C[Black 29 seals White's fate.];
W[oa];B[se];W[sd])
)

(;B[sc]C[Black 25 is a mistake.];W[rg];B[qf];W[se])
)

(;W[sb]C[White 24 is a mistake.];B[se];W[sc];B[ra];W[pa];B[sf];W[oa];
B[sd])
)

(;B[re];W[qe];B[qf]
C[See for continuation the variation where White 20 is played before
White 18.]
LB[oe:19][pd:18][rd:20][re:21][qe:22])
)

(;W[rd];B[re];W[pd];B[oe];W[qe];B[qf]LB[qf:23];W[sb];B[ra]
C[Black 25 gives Black the most possible liberties.

White may try 'a' or 'b'.]
LB[pa:b][sc:a]
(;W[sc];B[pa];W[oa];B[qd]C[White must find the first ko threat.])

(;W[pa];B[qd];W[se];B[sf];W[qe]C[Black continues with 'a' or 'b'.]
LB[sd:b][rf:a]
(;B[rf];W[sc];B[sd];W[oa];B[qd];W[se])

(;B[sd]C[White continues with 'a'. White 'b' is a mistake.]
LB[sc:b][oa:a]
(;W[oa];B[se];W[qa])

(;W[sc]C[White 32 is a mistake.];B[se];W[oa];B[qd]
C[White must find a ko threat.])
)
)
)
)
)
)

(;W[rc]C[White 6 overemphasizes the corner.];B[nb]
C[Black 7 is a severe move. White must continue with 'a'. White
'b' is a mistake.]
LB[nc:b][oc:a]
(;W[oc]C[White has no choice but to seek life in the corner this way.]
;B[nc];W[rd];B[re]
(;W[pc]C[White 12 is necessary.];B[nd])

(;W[nd]
C[White 12 is a mistake. Black gets a ko fight for White's group
in the corner.]
;B[oa]C[A ko fight ensues.])
)

(;W[nc]C[White 8 is a mistake.];B[pb];W[mb];B[pc])
)
)

(;W[re])

(;W[tt]
C[White plays elsewhere. This is not recommended if Black has an
extension at top as marked.]
TR[jc];B[qd]C[White continues with 'a' or 'b'.]LB[pc:b][ob:a]
(;W[ob]C['a' and 'b' are miai.]LB[rc:b][mc:a]
(;B[rc];W[mc])

(;B[mc];W[rc])
)

(;W[pc];B[oc];W[rb]C[White 7 is a tesuji to live in the corner.];B[rd]
;W[ob];B[nb]
C[White continues with 'a'. White 'b' leaves White open to a ko
threat.]
LB[pa:b][qa:a]
(;W[qa])

(;W[pa]C[Black can force a ko if White plays 11 here.])
)
)
)

(;B[qd]
C[
Tobi-Tsuke = Jump-Attach
---------------------------

Black 3 is possible, but is not recommended.
'A' is correct, 'B' leads to a low position.
]
LB[rd:B][qe:A]
(;W[qe]
C[Black 4 is better than a hane below Black 3 ('b').

Black continues with 'a'. Black 'b' is unthinkable.]
LB[rd:b][pd:a]
(;B[pd];W[rd]
C[THe triangled stone now is overconcentrated.
Black plays 'a' when the ladder to capture White 4 is favorable.
If that ladder is unfavorable, Black plays 'b'.]
LB[re:b][rc:a]TR[od]
(;B[rc];W[rb];B[re];W[sc];B[qf]
C[White continues with 'a'. White cannot afford to play elsewhere
('b').]
LB[dp:b][ob:a]
(;W[ob];B[pe]C[The marked stone is now meaningless.]TR[od])

(;W[tt]C[White plays elsewhere, a mistake.];B[pb];W[qb])
)

(;B[re]
C[Black plays this way when White 4 cannot be caught in a ladder.];
W[rf];B[rc];W[se];B[qb];W[ph]
C[White gets a nice position on the right.])
)

(;B[rd]C[Black 5 is unreasonable.];W[pd]
C['a' and 'b' are miai. White gains advantage either way.]
LB[pe:b][pc:a]
(;B[pc];W[pe];B[qb];W[oc];B[pb];W[nd]C[Continuation for Black on A.]
LB[nc:A])

(;B[pe];W[pc]C['A' or 'B'.]LB[pf:B][qf:A]
(;B[qf];W[oe];B[pf];W[nd];B[of];W[ne])

(;B[pf];W[oc];B[nd];W[rf];B[rg];W[re];B[qh])
)
)
)

(;W[rd];B[qe];W[pc];B[oc];W[re];B[qg];W[rf];B[og])
)
)

(;W[dp]
C[
Tenuki
-------

'A' or 'B'.
'C' is bad, unless Black already has a stone on one of the triangled
spots.
]
LB[qc:C][qe:B][qd:A]TR[kc][lc]
(;B[qd]C[This variation is covered as Komoku-Tenuki-Takamoku.])

(;B[qe]
C[
Takageima Shimari
--------------------

'A' is the correct invasion. 'B' is inferior.
After another tenuki 'C' Black can secure his corner completely.
]
LB[pp:C][qc:B][qd:A]
(;W[qd]C['A' takes the outside, 'B' the corner.]LB[qc:B][pd:A]
(;B[pd];W[qc];B[re];W[ob]
C['A' is correct, 'B' is a mistake: White sacrifices two stones
and reduces in sente.]
LB[nb:B][nc:A]
(;B[nc];W[nb];B[lc];W[rb]C[White lives in gote.])

(;B[nb];W[nc];B[pb];W[mb];B[pc])
)

(;B[qc];W[pd];B[pc];W[pe];B[rd];W[re];B[qf];W[oe];B[rc];W[nd];B[oc];
W[pg];B[rf];W[ng])
)

(;W[qc]C['A' encloses White, 'B' drives him out.]LB[pb:B][pc:A]
(;B[pc];W[qd];B[pe];W[rb];B[pb];W[re];B[rf];W[sc];B[rd];W[se];B[qb];
W[ra])

(;B[pb]C['A' is correct, 'B' a mistake.]LB[re:B][qb:A]
(;W[qb];B[pc];W[re]C['A' drives White out, 'B' encloses him.]
LB[rf:B][rd:A]
(;B[rd];W[qd];B[rf];W[pe];B[qf];W[pd];B[nc];W[rc];B[se])

(;B[rf];W[rd];B[qf];W[sc];B[se];W[rb])
)

(;W[re];B[rf];W[rd];B[qf];W[qb];B[se];W[sc];B[rb];W[ra];B[sb];W[pc];
B[ob];W[oc];B[nc];W[nb];B[mb];W[nd];B[mc];W[oe];B[pd])
)
)

(;W[pp];B[nc])
)

(;B[qc];W[mc]
C[Black has no move to secure an efficient amount of territory.
If he'd like to make a light moyo with a wide extension, White
3 on the triangled position would be much better shape.]
LB[qc:3]TR[qd])
)
)

(;B[nc]
C[
Oomokuhazushi = 6-3 Point
------------------------------

The large mokuhazushi point (6-3), a remnant of the "new fuseki"
movement in Japan in the 1930's. As an initial corner point,
its popular usage has not stood the test of time.
'A' or 'B'.
]
LB[pd:B][qd:A]
(;W[qd]C[
Komoku
----------

Black continues with 'a' or 'b'.
]
LB[qb:b][qc:a]
(;B[qc]C[White continues with 'a' or 'b'.]LB[pc:b][rc:a]
(;W[rc]C[Black continues with 'a' or 'b'.]LB[pd:b][pc:a]
(;B[pc]C[White continues with 'a' to 'c'.]LB[rb:c][pf:b][re:a]
(;W[re])

(;W[pf];B[rb];W[qi])

(;W[rb];B[qf];W[qe];B[pf];W[od];B[mc];W[oc];B[ob];W[ne];B[kd])
)

(;B[pd]C[White continues with 'a'. White 'b' is not recommended.]
LB[pc:b][qe:a]
(;W[qe]C[Black continues with 'a' or 'b'.]LB[rb:b][pc:a]
(;B[pc];W[rb])

(;B[rb]
C[White continues with 'a' (a forcing move). White 'b' is a change
of direction that results in Black's favor.]
LB[pc:b][qb:a]
(;W[qb]C[White 8 is a simple forcing move.];B[pc];W[sb];B[pf])

(;W[pc]C[White 8 aims to take the top, but is not recommended.];B[qb];
W[od];B[pe];W[oc];B[oe];W[nd];B[qf];W[rf];B[rg]
C[White continues with 'a' or 'b'.]LB[qg:b][pf:a]
(;W[pf];B[qg];W[nf];B[of];W[og];B[pg];W[ne];B[pf];W[oh])

(;W[qg]C[White plays 18 to fight for life with a ko.];B[pf];W[re];
B[rh];W[sb];B[sd];W[sc];B[sf];W[rd];B[sg];W[se];B[sa];W[ra];B[qa])
)
)
)

(;W[pc];B[qb];W[pe];B[od];W[re];B[rb];W[sb];B[pb];W[pg])
)
)

(;W[pc];B[pd]
C[White continues with 'a'. White 'b' is not recommended.]
LB[od:b][qb:a]
(;W[qb];B[rc];W[od]C['A' is correct, 'B' is not recommended.]
LB[pb:B][pe:A]
(;B[pe];W[oc];B[rb]C['A' or 'B' are ok.]LB[nd:B][pg:A]
(;W[pg];B[of]C[White continues with 'a' or 'b'.]LB[og:b][nd:a]
(;W[nd];B[og];W[kc];B[ph])

(;W[og];B[nf];W[mc];B[qe];W[rf];B[re];W[qk])
)

(;W[nd];B[pg];W[kd])
)

(;B[pb];W[pe];B[oc];W[pd];B[rb];W[ob];B[qa];W[md];B[nb]
C[The White thickness and sente are more valuable than the small
Black corner.])
)

(;W[od]C[White 6 is not recommended.];B[pe]
C[White continues with 'a' or 'b'.]LB[oc:b][qb:a]
(;W[qb];B[oc];W[rc];B[pb];W[qc];B[ne])

(;W[oc];B[qe];W[qb];B[rd];W[rc];B[ld];W[nd];B[qi])
)
)
)

(;B[qb]C[White continues with 'a' to 'c'.]LB[pd:c][ph:b][qg:a]
(;W[qg];B[kc])

(;W[ph];B[ne];W[pd];B[oc];W[rb];B[jc])

(;W[pd];B[oc];W[qh];B[rc];W[rd])
)
)

(;W[pd]C[
Hoshi
-------
];B[qf];W[pf];B[pg];W[of]C['A' or 'B'.]
LB[qc:B][qe:A]
(;B[qe];W[qd];B[og];W[ng]C['A' or 'B'.]LB[nf:B][pe:A]
(;B[pe];W[oe];B[od];W[qg];B[rd];W[rc];B[re];W[rg];B[nf];W[ne];B[me];
W[mf];B[nd];W[nf];B[qc]C['A' is correct, 'B' doesn't work.]
LB[pc:B][oh:A]
(;W[oh])

(;W[pc];B[qb];W[pb];B[rb];W[nb];B[mb];W[ob];B[lc])
)

(;B[nf];W[nd];B[md];W[me];B[mf];W[le])
)

(;B[qc];W[qe];B[qg];W[pc];B[pb];W[rb];B[qb];W[rc])
)
)

(;B[nd]
C[
Ootakamoku = Chaogao = 6-4 Point
---------------------------------------

The large takamoku (high) point (6-4), experimented with during
the "new fuseki" movement in Japan in the 1930's. This point
is seldom played as the initial corner point nowadays.

White continues with 'a' to 'f'.
Tenuki 'g' is also possible.
]
LB[dp:g][pe:f][qe:e][qc:d][pc:c][qd:b][pd:a]
(;W[pd]
C[Black continues with 'a' or 'b'.
'c' is not recommended.
'd' is possible.
]
LB[pc:d][qd:c][pe:b][pf:a]
(;B[pf]
C[See the variation starting with the 4-4-point, where after the
high near approach move tenuki occurs, followed by the second
kakari.]
LB[nd:1][pd:2][pf:3])

(;B[pe];W[qe]C[Black continues with 'a' to 'c'.]LB[qd:c][pf:b][qf:a]
(;B[qf]C[White continues with 'a' or 'b'. White 'c' is an overplay.]
LB[pf:c][qd:b][oe:a]
(;W[oe];B[pf];W[od];B[qd];W[qc];B[re];W[rc];B[nb];W[ob];B[jc])

(;W[qd]C[Black continues with 'a' or 'b'.]LB[oe:b][pf:a]
(;B[pf];W[od];B[ne];W[nb];B[mb];W[ob];B[mc])

(;B[oe];W[rf];B[qg];W[rg];B[qh])
)

(;W[pf]C[White 6 is an overplay.];B[oe];W[qg];B[rf];W[qd];B[qh];W[of];
B[rg];W[nf];B[nc];W[pb];B[kd])
)

(;B[pf]C[White continues with 'a'. White 'b' is not recommended.]
LB[qf:b][od:a]
(;W[od];B[ne];W[qf]
C[Black continues with 'a'. Black 'b' is not recommended.]
LB[qd:b][qg:a]
(;B[qg];W[qd];B[pg];W[nb];B[nc];W[ob];B[lc])

(;B[qd]C[Black 9 is not recommended, as Black gains no advantage.];
W[qc];B[rd];W[rc];B[qg];W[re]
C[Black still has to cover the potential cutting point. This variation
is not favorable to Black.]
MA[pg])
)

(;W[qf]C[White 6 is not recommended.];B[qd];W[pc];B[rd];W[qg];B[qb];
W[pb];B[qc];W[oe];B[pg];W[od];B[qh];W[rh];B[qi]
C[The Black group in the corner may not live, but White is split
in two, and the White group at right must crawl along the second
line, to gain liberties, giving Black favorable thickness.])
)

(;B[qd]
C[Black 5 results in Black building a moyo on the right, while
White builds a moyo at top.]
;W[qc];B[rd];W[oe];B[pf];W[od];B[rc];W[pb];B[qf];W[of];B[og];W[ng];
B[oh];W[nh];B[oi];W[jd];B[ni];W[lh])
)

(;B[qd];W[qc];B[pe];W[pc];B[re];W[rd];B[qe];W[nb]
C['A' is correct, tenuki 'B' is not recommended.]LB[dp:B][pi:A]
(;B[pi])

(;B[dp];W[oe];B[od];W[of]C['A' or 'B'.]LB[qh:B][me:A]
(;B[me];W[qg];B[rg];W[rh];B[rf];W[ph];B[qi];W[qh];B[rc];W[rb];B[sd];
W[sb];B[sc])

(;B[qh];W[me])
)
)

(;B[pc];W[qc];B[oc];W[qd];B[jc];W[qh])
)

(;W[qd]C[Black continues with 'a' or 'b'.
]LB[pd:b][qc:a]
(;B[qc]C[White continues with 'a' or 'b'.]LB[pc:b][rc:a]
(;W[rc]C[Black continues with 'a' or 'b'.]LB[pd:b][pc:a]
(;B[pc]C[White continues with 'a' to 'c'.]LB[pd:c][qg:b][re:a]
(;W[re];B[jc])

(;W[qg];B[rb];W[qj])

(;W[pd]
C['A' settles on the top, giving the right.
'B' has various outcomes.
'C' is a mistake.]
LB[rd:C][rb:B][od:A]
(;B[od];W[pb];B[qb];W[rb];B[ob];W[pf])

(;B[rb]
C['A' initiates the cut.
'B' makes a big wall, but Black's shape is better.]
LB[od:B][oc:A]
(;W[oc];B[od];W[ob]C['A' or 'B',]LB[pb:B][rd:A]
(;B[rd]C['A' or 'B'.]LB[qb:B][re:A]
(;W[re];B[sc];W[mc];B[pf];W[qf];B[pe];W[qe];B[pg];W[qh];B[md];W[lc];
B[qg];W[rg];B[se];W[rf];B[oi];W[qj];B[ke];W[jc])

(;W[qb];B[sc];W[pb];B[rc];W[qf];B[re];W[of];B[mc];W[mb];B[lb];W[nc];
B[ld];W[na];B[rf];W[qg];B[hc];W[rg];B[ra];W[pk])
)

(;B[pb];W[pa];B[qb];W[mc];B[md];W[lc];B[rd];W[re];B[sc];W[pf];B[ng];
W[qj])
)

(;W[od];B[oc];W[ne];B[me];W[md];B[nc];W[nf];B[le];W[pj];B[rd];W[re];
B[sc];W[qf])
)

(;B[rd]
C['A' avoids being tricked making a wall around a small corner.
'B' destroys Black's position, but needs the ladder.
'C' is bad.]
LB[re:C][rb:B][oc:A]
(;W[oc];B[rb];W[pb];B[qb];W[re];B[sc];W[od])

(;W[rb];B[re];W[qf];B[rf];W[qg];B[rg];W[qh];B[od]
C['A' if Black has the ladder, 'B' if White has the ladder.]
LB[pb:B][qe:A]
(;W[qe];B[qb];W[ra];B[qa];W[rh];B[sc];W[sg];B[sb];W[sf])

(;W[pb];B[qe];W[pe];B[pf];W[oe];B[of];W[ne];B[me])
)

(;W[re];B[rb];W[sd];B[od])
)
)
)

(;B[pd];W[pe];B[pc];W[re];B[oe];W[pf])
)

(;W[pc];B[pd]
C[White continues with 'a' to take the corner or top, 'b' to emphasize
the right, 'c' to take the corner, or 'd' for influence at top,
or possibly the right.]
LB[ob:d][pb:c][rc:b][od:a]
(;W[od]C[White 6 emphasizes the corner or top.];B[pe];W[oc];B[oe]
C[White continues with 'a' to take the corner, or 'b' to emphasize
the top.]
LB[qb:b][rc:a]
(;W[rc];B[qb];W[rb]C[Black continues with 'a' or 'b'.]LB[rd:b][qe:a]
(;B[qe];W[rd];B[nc];W[pb];B[ob];W[qa];B[mf])

(;B[rd];W[qe];B[qf];W[re];B[rf];W[sd];B[nc];W[pb];B[ob];W[qa];B[ne])
)

(;W[qb];B[rc];W[rb];B[rd];W[mb];B[qj])
)

(;W[rc]C[White 6 emphasizes the right.];B[qb];W[pe];B[od];W[re];B[rb];
W[sb];B[ob];W[pg])

(;W[pb]C[Black continues with 'a' or 'b', but 'a' is preferred.]
LB[qe:b][qb:a]
(;B[qb]C[White continues with 'a' or 'b'.]LB[rb:b][rd:a]
(;W[rd];B[oc];W[pe];B[od];W[rb];B[ob];W[rc];B[pa];W[qh])

(;W[rb]C[Black continues with 'a' or 'b'.]LB[rd:b][rc:a]
(;B[rc]C['A' or 'B'.]LB[rd:B][od:A]
(;W[od];B[pe];W[oe];B[of];W[oc];B[qe];W[ne];B[pg];W[kc]
C[In the endgame White A is sente.]LB[qa:A])

(;W[rd]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[ra:b][sb:a]
(;B[sb];W[ra];B[qa];W[nb]
C[Black continues with 'a'. 

Black 'b' is not recommended.]
LB[od:b][pe:a]
(;B[pe]C[White continues with 'a'. White 'b' and 'c' are mistakes.]
LB[rf:c][qf:b][sd:a]
(;W[sd]
C[Black plays 'a' to emphasize the right, 'b' to emphasize the
top.]
LB[mb:b][qe:a]
(;B[qe]C[Black 17 emphasizes the right.];W[sc];B[sa];W[rb];B[re];W[ra]
;B[se];W[pa])

(;B[mb]C[Black 17 emphasizes the top.];W[sc];B[sa];W[rb];B[nc])
)

(;W[qf]C[White 16 is a mistake.];B[mb];W[sd];B[sa];W[qe];B[oc];W[ob];
B[nc])

(;W[rf]C[White 16 is a mistake.];B[qf];W[re];B[mb];W[sd];B[nc];W[ob];
B[qh])
)

(;B[od]
C[Black 15 is not recommended, though White must play correctly
to get a favorable result.

White continues with 'a'. White 'b' is a mistake.]
LB[sd:b][qf:a]
(;W[qf];B[ob];W[oc];B[nc];W[oa];B[mb];W[lb];B[sa];W[pa]
(;B[pf]
C[White 'a' sacrifices the corner for the center and right side.

White 'b' takes the corner, scraficing the center.]
LB[sd:b][pe:a]
(;W[pe]C[White sacrifices for the right side and center.];B[oe];W[qe]
C[Black continues with 'a' to 'c'.

Black 'b' requires a ladder block to the lower left corner.]
LB[of:c][ma:b][qg:a]
(;B[qg];W[rg];B[rh];W[pg];B[of];W[qh];B[ma];W[mc];B[lc];W[md];B[kb];
W[ld];B[la];W[mg])

(;B[ma]
C[Black 29 is unreasonable without a ladder block to the lower
left.];
W[mc];B[lc];W[md];B[kb];W[of];B[ne];W[ld])

(;B[of]C[Black 29 is slow but sure.];W[mc];B[qg];W[rg];B[rh];W[qh];
B[pg];W[rf];B[ri];W[sd])
)

(;W[sd]C[White takes the corner.];B[qg];W[qe];B[ma];W[mc];B[lc];W[md];
B[kb];W[sc];B[me];W[ld];B[la];W[rb];B[ke])
)

(;B[ma];W[mc];B[lc];W[md];B[kb]
C[White plays 'a' for thickness and the right side, or 'b' to take
the top at the expense of the right side.]
LB[ne:b][ld:a]
(;W[ld]C[White plays 30 for thickness and the right side.];B[la];W[ne]
;B[pe];W[pf];B[na])

(;W[ne]C[White plays 30 to take the top.];B[me];W[ld];B[nf];W[kc];
B[la];W[jb];B[lc];W[pe];B[oe];W[of];B[ne];W[lb];B[og];W[ka];B[qg];
W[rg];B[pf];W[rf])
)
)

(;W[sd]C[White 16 is a mistake.];B[sa];W[mb];B[qe];W[rf];B[re];W[se];
B[qf];W[rg];B[qh]
C[White dies quickly with 'a', or crawls along the second line
(the "line of defeat") with 'b' to live in agony.]
LB[qg:b][rh:a]
(;W[rh];B[sf]C[White dies.];W[sg];B[sc];W[sf];B[ri])

(;W[qg];B[pg];W[pf];B[pe];W[ph];B[og];W[rh];B[sf];W[sg];B[qi];W[ri];
B[qj];W[rj];B[qk];W[rk];B[ql];W[rl];B[qm])
)
)
)

(;B[ra]C[Black 11 is a mistake.];W[sb];B[sc]
C[White continues with 'a'. White 'b' is a mistake.]LB[nb:b][pa:a]
(;W[pa];B[pe]
(;W[qa];B[sa];W[rb]
C[Black plays 'a' to emphasize the right, 'b' to emphasize the
top.]
LB[oc:b][re:a]
(;B[re];W[sb];B[qe];W[sd])

(;B[oc];W[tt]C[White plays elsewhere.];B[ob];W[sb];B[oa];W[sd])
)

(;W[rf]C[White 16 is a mistake.];B[sa]C['a' and 'b' are miai.]
LB[oc:b][re:a])
)

(;W[nb]C[White 14 is a mistake.];B[pe]C[White may try 'a' or 'b'.]
LB[rf:b][qf:a]
(;W[qf];B[mb];W[pa];B[qe];W[re];B[rf];W[rg];B[oc])

(;W[rf];B[sa]C['a' and 'b' are miai.]LB[mb:b][re:a])
)
)
)
)

(;B[rd];W[qe];B[rc];W[nb]C[Black continues with 'a' or 'b'.]
LB[pa:b][pe:a]
(;B[pe];W[qf]
C[Black plays 'a' to take the corner, and 'b' for influence toward
the top.]
LB[pf:b][sb:a]
(;B[sb];W[lc];B[og])

(;B[pf];W[qg];B[pg];W[qh];B[mb];W[qa]
C[Black gives away the corner straight-away with 'a', or plays
a ko for the corner with 'b'.]
LB[ra:b][nc:a]
(;B[nc];W[re];B[ob])

(;B[ra]C[Black 21 forces a ko fight for the corner.];W[sa];B[sb];W[sc]
;B[sd];W[re];B[sb];W[nc];B[mc];W[sc])
)
)

(;B[pa]C[White continues with 'a'. White 'b' is an overplay.]
LB[lc:b][nc:a]
(;W[nc];B[od];W[re];B[sb];W[md];B[me];W[ld];B[le];W[kd];B[ph];W[ke])

(;W[lc]C[White 'b' is an overplay.];B[pe];W[qf];B[mb]
C[White continues with 'a'. White 'b' is a mistake.]LB[mc:b][nc:a]
(;W[nc];B[pf];W[md];B[qg])

(;W[mc]C[White 18 is a mistake.];B[ob];W[oc];B[nc];W[oa];B[qa])
)
)
)
)
)

(;B[qe];W[rd];B[pe];W[rc])
)

(;W[ob]C[Almost ironically, White 6 aims at influence at the top.];
B[qe];W[rd];B[qb]
C[White plays 'a' for influence at top, or 'b' for territory on
the right side.]
LB[re:b][od:a]
(;W[od];B[pe];W[oe];B[re])

(;W[re];B[oc];W[pb];B[nb];W[pe];B[od];W[rb];B[oa];W[rc];B[pa];W[qf])
)
)
)

(;B[pd])
)

(;W[pc];B[pd];W[qc]
C[Black continues with 'a' to emphasize the top, 'b' to emphasize
the right side.]
LB[qd:b][oc:a]
(;B[oc];W[qd];B[pe];W[qe];B[pf];W[qg])

(;B[qd];W[od];B[oe];W[oc];B[ne];W[nc];B[ld];W[pe];B[pf];W[qe];B[rd];
W[rf];B[rg];W[re];B[qh])
)

(;W[qc]C[Black continues with 'a' or'b'.]LB[pd:b][qe:a]
(;B[qe])

(;B[pd];W[re];B[pc];W[qb];B[qf]
C[White continues with 'a' peaceably, or 'b' to cut.]LB[qe:b][rf:a]
(;W[rf];B[qg];W[pb])

(;W[qe]C[kiri (cut)];B[pe];W[pf];B[qh];W[of];B[rf];W[pb];B[qd];W[rd];
B[ob];W[sc];B[ld])
)
)

(;W[qe];B[pd];W[rc];B[pf];W[qf];B[pg];W[rh])

(;W[pe];B[pd];W[qd];B[qc])

(;W[tt];B[qd]C[This variation is covered as Komoku-Tenuki variation.])
)

(;B[oe]
C[
Go-no-go = Wu~wu~ = 5-5 Point
-----------------------------------

The 5-5 was experimented with briefly during the "New Fuseki"
movement in Japan in the 1930s. The 5-5 point has not retained
popularity because the 4-4 hoshi (star) point strikes a better
balance between influence and territory. As one can see from
the variations, though, the 5-5 is playable.

White responds with 'a' to 'e'.
]
LB[pd:e][qf:d][qe:c][qd:b][qc:a]
(;W[qc]C[
San-san
--------

Black continues with 'a' or 'b'.
]
LB[pc:b][oc:a]
(;B[oc]C[White continues with 'a' or 'b'.]LB[qf:b][qe:a]
(;W[qe];B[pg])

(;W[qf]C[Black continues with 'a' or 'b'.]LB[qb:b][pg:a]
(;B[pg];W[qg];B[ph];W[qh];B[pi])

(;B[qb];W[rb];B[qd];W[pc];B[pd];W[rd];B[pb];W[rc];B[pg])
)
)

(;B[pc];W[pb];B[qd];W[oc];B[pd];W[rb];B[rc];W[qb];B[nc])
)

(;W[qd]C[
Komoku
----------

Black continues with 'a', 'b' or 'c'.
]
LB[qf:c][pc:b][qe:a]
(;B[qe]
C[White continues with 'a'. White 'b' gives Black great thickness
to the top, though White gets good territory.]
LB[pe:b][re:a]
(;W[re]C[Black continues with 'a'. Black 'b' is not recommended.]
LB[rf:b][pe:a]
(;B[pe]C[White continues with 'a'. White 'b' is not recommended.]
LB[qf:b][rf:a]
(;W[rf];B[oc];W[pc];B[ob])

(;W[qf]C[Black continues with 'a'. Black 'b' is a mistake.]
LB[rd:b][rf:a]
(;B[rf];W[rg];B[rd];W[sf];B[qc])

(;B[rd]C[Black 7 is a mistake.];W[rc];B[rf];W[sd];B[qg];W[oc])
)
)

(;B[rf]C[Black 5 is not recommended.];W[pe];B[qf];W[pd];B[pf];W[od];
B[ne];W[nd];B[me];W[lc])
)

(;W[pe]
C[White 4 gives Black great thickness towards the top, while White
gets solid territory at right.]
;B[pd];W[pf];B[qc];W[rd];B[od];W[rc];B[og]
C[White continues with 'a'. White 'b' is a mistake.]LB[of:b][pg:a]
(;W[pg];B[ph];W[qh];B[of];W[pi];B[oh];W[qg])

(;W[of]
C[White's attempt to make cutting points in Black's shape does
not work well, and Black gets better access to the right than
in the alternate variation.]
;B[nf];W[qf];B[ng])
)
)

(;B[pc]C['A' or 'B'.]LB[qg:B][qc:A]
(;W[qc]C['A' or 'B'.]LB[qf:B][pf:A]
(;B[pf]C[White continues with 'a' or 'b'.]LB[rf:b][pd:a]
(;W[pd];B[od]C[White continues with 'a' or 'b'.]LB[ob:b][oc:a]
(;W[oc];B[nc];W[pb];B[ob];W[rf])

(;W[ob];B[oc];W[pb];B[nb];W[rf];B[mc];W[qg])
)

(;W[rf];B[pb];W[qg];B[kc])
)

(;B[qf]C['A' or 'B'.]LB[pb:B][oc:A]
(;W[oc];B[nc];W[ob]C['A' or 'B'.]LB[od:B][nb:A]
(;B[nb];W[od];B[nd];W[ne];B[pe]
C['A' is correct, 'B' and 'C' are mistakes.]LB[pd:C][me:B][nf:A]
(;W[nf];B[kc]C['A' is necessary, tenuki 'B' is a mistake.]
LB[dp:B][qe:A]
(;W[qe];B[pg];W[ic];B[ke];W[nh];B[pj];W[kg];B[jf];W[ih])

(;W[dp];B[og];W[lf];B[pd];W[pb];B[oa];W[re];B[pa];W[rf];B[rg];W[ra];
B[qb];W[rb];B[sf];W[sc])
)

(;W[me];B[kc])

(;W[pd];B[kc];W[nf];B[qi])
)

(;B[od];W[nb];B[mc];W[mb];B[lc])
)

(;W[pb])
)
)

(;W[qg];B[qc];W[qj])
)

(;B[qf];W[oc]C['A' or 'B'.]LB[qi:B][md:A]
(;B[md]PL[2];B[od]
C[Later, B can increase his thickness here.
'A' is correct, 'B' is submissive.]
LB[pc:B][nc:A]
(;W[nc];B[pc];W[qc]C['A' and 'B' are good.]LB[pd:B][pb:A]
(;B[pb];W[pd];B[mc];W[qb])

(;B[pd];W[pb];B[ob];W[qb];B[nb];W[mc];B[lc];W[mb];B[lb];W[oa];B[ld])
)

(;W[pc];B[nc]C[Later.])
)

(;B[qi];W[mc];B[pc];W[pd];B[od];W[ob];B[rc];W[rd];B[qc];W[pb];B[se];
W[sd];B[re];W[rb];B[pe];W[qb])
)
)

(;W[qe]
C[
Mokuhazushi
---------------

Black continues with 'a' to 'd'.
]
LB[pc:d][qf:c][qd:b][oc:a]
(;B[oc]C[White continues with 'a' or 'b'.]LB[qc:b][qh:a]
(;W[qh];B[qc])

(;W[qc];B[pg];W[rg];B[jd])
)

(;B[qd]
C[White continues with 'a' to settle on the right, or 'b' to start
a fight.]
LB[pd:b][rd:a]
(;W[rd];B[pd]
C[White continues with 'a', 'b' or 'c'.

White 'a' emphasizes the right side. With 'b', White settles
his stones in sente.
'd' is a mistake.]
LB[rf:d][rc:c][qc:b][qg:a]
(;W[qg];B[rc];W[qj])

(;W[qc]C[White 6 is played if White wants sente.];B[pc];W[rb];B[qb];
W[rc];B[qf];W[re];B[pf])

(;W[rc];B[qf]C['A' is correct, 'B' is a mistake.]LB[rf:B][re:A]
(;W[re];B[og];W[pb])

(;W[rf];B[pe];W[re];B[qg])
)

(;W[rf];B[rc];W[sc];B[sb];W[sd];B[rb];W[pg])
)

(;W[pd]C[As always, White 4 is a fighting move.];B[pe];W[qc];B[rd];
W[qf];B[pc];W[od];B[qb];W[oc];B[pb];W[md];B[ne];W[ld];B[pi];W[qh];
B[og];W[qi];B[pj];W[qk];B[id])
)

(;B[qf]
C[Black 3 emphasizes the right side, though White has the choice
of that.]
;W[rf];B[pf]
C[White continues with 'a'. White 'b' is not recommended. White
'c' is very loose.]
LB[qc:c][qg:b][pd:a]
(;W[pd];B[rg];W[od];B[re];W[rd];B[sf];W[md])

(;W[qg]C[White 6 is not recommended.];B[rg];W[rh];B[re];W[sg];B[qd];
W[pg];B[jd])

(;W[qc]C[White 6 is a loose way of playing.];B[rg];W[nc];B[rd])
)

(;B[pc]C['A' is better than 'B'.]LB[pd:B][qc:A]
(;W[qc];B[qf];W[rf];B[pf];W[rd]C['A' is correct, 'B' is wrong.]
LB[pb:B][hd:A]
(;B[hd]C['A' is better than 'B'.]LB[oc:B][pb:A]
(;W[pb]C['A' is better than 'B'.]LB[oc:B][ob:A]
(;B[ob]C['A' or 'B'.]LB[oc:B][pd:A]
(;W[pd];B[od];W[oc];B[nc])

(;W[oc];B[nc]C['A' or 'B'.]LB[pd:B][od:A]
(;W[od];B[nd];W[pd];B[ne])

(;W[pd];B[od])
)
)

(;B[oc];W[ob];B[nc])
)

(;W[oc]C['A' is correct, 'B' is a mistake.]LB[pb:B][pd:A]
(;B[pd];W[pb];B[nb];W[ob];B[nc];W[od];B[nd];W[pe];B[of])

(;B[pb];W[pd];B[od];W[ob])
)
)

(;B[pb];W[kd];B[rg];W[pd];B[od];W[qb];B[nc];W[sg];B[rh];W[hd])
)

(;W[pd];B[od];W[qc];B[ob];W[qb];B[qf];W[rf];B[pf];W[rg];B[jd])
)
)

(;W[qf]
C[
Oomokuhazushi
------------------

White forsakes the corner for the right.
]
;B[qd]
C[White continues with 'a' or 'b'. White 'c' is not recommended.]
LB[oc:c][nc:b][qi:a]
(;W[qi];B[nc])

(;W[nc];B[pc])

(;W[oc]C[White 4 is not recommended. White cannot have it both ways.];
B[od];W[pc]
C[Here is the real overplay, but going the other way (the marked
location) makes little sense.]
CR[nc];B[qe];W[lc];B[qc];W[pg];B[ob];W[pb];B[nc];W[nb];B[mb];W[oa];
B[mc];W[qb];B[rb];W[qa]
C[Locally, Black may next address White 8. Depending upon circumstances,
'a' and 'b' are possibilities.]
LB[jc:b][ld:a])
)

(;W[pd]C[
Hoshi
-------
];B[pe]C[White continues with 'a' to 'c'.]
LB[oc:c][qe:b][qd:a]
(;W[qd];B[qe]C[White continues with 'a' or 'b'.]LB[nc:b][od:a]
(;W[od];B[nd];W[nc];B[mc];W[nb];B[mb];W[pb];B[md])

(;W[nc];B[oc];W[od];B[nd]C[White continues with 'a' or 'b'.]
LB[md:b][ob:a]
(;W[ob];B[mc];W[nb];B[md])

(;W[md];B[ne];W[mc];B[rd];W[pb];B[qb];W[pc];B[qc];W[ob])
)
)

(;W[qe];B[qf];W[qd];B[od];W[rf];B[qg];W[rg];B[qh];W[ob];B[oc];W[pb];
B[mc])

(;W[oc]C[Black continues with 'a' or 'b'.]LB[qd:b][qe:a]
(;B[qe];W[mc];B[qc];W[jc])

(;B[qd];W[qc];B[qe];W[rc];B[nc];W[nb];B[od];W[pc];B[mc];W[mb];B[lc])
)
)
)

(;B[qj]
C[
Reductions against a stone on the third line on the side
----------------------------------------------------------

. shoulder hit on 'A *'
- shoulder hit against a niken-biraki on 'A *'
- boshi on 'C *'
- keima on 'D *'
- oogeima on 'E *'
- ear move against an ikken tobi on 'F'
- attatchment at other stones on 'G *' before a direct approach
- tsuke on 'H *'

The choice of the reduction move depends on the type of Black
moyo and the strategic plan of White.
]
PL[2]LB[pj:H][pg:G][oh:F][ni:E][oi:D][oj:C][pi:A]
(;AB[kd][pd]AW[qp][oq];W[pi]C['A *' is joseki, 'B' is too low.]
LB[qi:B][pj:A]
(;B[pj]C['A *' or sabaki 'B *'.]LB[ni:B][oi:A]
(;W[oi]
C['A *' is usual, 'B' and 'C' are also possible, 'B' gives both
sides more strength.]
PL[2]LB[qi:C][oj:B][rh:A]
(;B[rh]C['A *', 'B' or 'C'.]LB[li:C][mi:B][oj:A]
(;W[oj]C[
* GOOD VARIATION *

Later, Black 'A' or 'C' or White 'B'.]
PL[2]LB[ok:C][qg:B][pg:A]
(;B[pg])

(;W[qg];B[qh];W[og])

(;B[ok];W[nk];B[ol]C[Black aims at A.]LB[nj:A])
)

(;W[mi])

(;W[li])
)

(;B[oj]C['A' is correct, 'B' is not recommended.]LB[mi:B][ni:A]
(;W[ni]
C['A' is correct. 'B' is bad. 'C' makes more influence and is good
if White 2 was a strategic mistake. 'D' is questionable. 'E'
weakens the top side. 'F' is not recommended.]
LB[qh:F][pi:2][qi:E][mk:D][nj:C][qn:B][rh:A]
(;B[rh])

(;B[qn];W[qi]C[White attacks both sides.])

(;B[nj];W[mi])

(;B[mk];W[li];B[kk]C[Later, White can play A.]LB[qi:A])

(;B[qi]C['A' or 'B'.]LB[qh:B][pg:A]
(;W[pg];B[qn]C[White aims at A.]LB[nd:A])

(;W[qh];B[qn])
)

(;B[qh]C[Aji for White.])
)

(;W[mi];B[ni];W[nh];B[nj]
C[Ater 'A' or 'B', White has a weak position.]LB[mh:B][og:A]
(;W[og];B[nd])

(;W[mh];B[pg])
)
)

(;B[qi]C['A' settles the position, 'B' starts a fight.]LB[qh:B][pg:A]
(;W[pg];B[qh]C['A' or 'B'.]LB[nd:B][nf:A]
(;W[nf];B[nd])

(;W[nd])
)

(;W[qh];B[ph];W[qg];B[oh])
)
)

(;W[ni]
C['A *' is correct, 'B' is possible. 'C' is too heavy. 'D' is not
recommended.]
LB[ph:D][qi:C][oj:B][oi:A]
(;B[oi];W[oh];B[oj]C['A *', 'B', 'C' or 'D' are ok.]
LB[mg:D][ng:C][mh:B][nh:A]
(;W[nh]
C[
* GOOD VARIATION *

Later Black 'A' to connect or 'B' for territory or 'C' for influence
or
White 'A' or White 'C' or White invades the top side.]
PL[2]LB[mk:C][qn:B][qg:A]
(;B[qg])

(;B[qn])

(;B[mk])

(;W[qg])

(;W[mk])
)

(;W[mh])

(;W[ng])

(;W[mg])
)

(;B[oj]C['A' or 'B'.]LB[oi:B][ng:A]
(;W[ng]
C[A Black push at A is slow and may not be answered immediately.]
LB[oi:A])

(;W[oi])
)

(;B[qi]C[Tenuki is better than continuing.];W[ph];B[oj]
C[Tenuki is better than continuing.];W[mg];B[nd])

(;B[ph]C['A' is correct, 'B' is bad.]LB[qi:B][oh:A]
(;W[oh]C['A' is submissive, 'B' hurts the top side.]LB[qi:B][qh:A]
(;B[qh])

(;B[qi];W[pg];B[oi];W[qh];B[nh];W[pi];B[oj];W[ng];B[mh];W[mg];B[lh];
W[nd])
)

(;W[qi];B[oi];W[oh];B[oj]C[Nothing but aji for White.])
)
)
)

(;B[qi]C['A' or 'B'.]LB[pg:B][ph:A]
(;W[ph]
C['A' connects, 'B' gives a bit territory for more valuable influence,
'C' hurts the top side.]
LB[pj:C][qh:B][qg:A]
(;B[qg])

(;B[qh];W[pg];B[qg];W[pf];B[re])

(;B[pj];W[ni];B[oj]C['A' is correct, 'B' and 'C' are too slow.]
LB[nf:C][mg:B][nd:A]
(;W[nd])

(;W[mg];B[nd]C[Black aims at A.]LB[lj:A])

(;W[nf];B[nd]C[Black aims at A.]LB[lj:A])
)
)

(;W[pg]C['A' or 'B' are possible. 'C' hurts the top side.]
LB[oi:C][qh:B][ph:A]
(;B[ph];W[oh];B[qh];W[og]C[Black can connect on A.]LB[qf:A])

(;B[qh];W[ng])

(;B[oi]C['A' to weaken the top side, 'B' to fight.]LB[pj:B][oh:A]
(;W[oh];B[pj];W[ni];B[ph];W[qh];B[nh];W[pi];B[oj];W[ng];B[mh];W[mg];
B[lh];W[nd])

(;W[pj];B[ph];W[oh];B[qh];W[ni];B[oj];W[pk])
)
)
)
)

(;AB[kc][od][qd][qm]AW[qp][oq];W[pi]
C['A *' and 'B *' are joseki.
'A' leaves continuations to attack White, 'B' takes more territory.
'C' builds thickness in the center. 'D' attacks the White group
and pushes it into the Black moyo.

The shoulder hit is bad, if the triangled stone is on the squared
position instead.]
LB[nj:D][ni:C][pj:B][qi:A]TR[qm]MA[qn]
(;B[qi]C['A *' or 'B' are ok.]LB[pg:B][ph:A]
(;W[ph]C['A *' is correct, 'B' and 'C' lead to overconcentration.]
LB[pj:C][qh:B][ok:A]
(;B[ok]C['A *' or 'B'.]LB[mh:B][mi:A]
(;W[mi]
C[
* GOOD VARIATION *

Immediately or later, Black attacks the White group on 'A' or
'B'. 'C' is too defensive, as Black is already settled.]
LB[rg:C][mg:B][ni:A]
(;B[ni];W[nh];B[nj];W[mg];B[lh];W[mh];B[og];W[oh];B[lk])

(;B[mg];W[nj];B[ml])

(;B[rg])
)

(;W[mh]C[Black can attack on 'A' or 'B'.]LB[mj:B][ni:A]
(;B[ni];W[nh];B[og];W[oh];B[lj]
C[Black doesn't want to give White time for an invasion on the
top side.])

(;B[mj])
)
)

(;B[qh];W[pg];B[qg];W[mh]C[Overconcentration marked.]TR[qm][qj])

(;B[pj];W[ni];B[oj]C['A', 'B' or 'C'.]LB[lh:C][nf:B][mg:A]
(;W[mg])

(;W[nf])

(;W[lh])
)
)

(;W[pg]
C['A' is usual, 'B' leads to a big fight, 'C' is an attack, if
Black is stronger.]
LB[ni:C][oi:B][ph:A]
(;B[ph];W[oh];B[qh];W[pc];B[pd];W[ng];B[of];W[og];B[nj])

(;B[oi];W[oh];B[pj];W[ni];B[ph];W[qh];B[nh];W[pi];B[oj];W[ng];B[mh];
W[mg];B[lh])

(;AB[pl][qn]AE[qm]AW[oo];B[ni]C[White 2 was already bad.]LB[pi:2])
)
)

(;B[pj]C['A *' is correct, 'B' makes White heavy.]LB[ni:B][oi:A]
(;W[oi]C['A *' and 'B' are ok, 'C' is not recommended.]
LB[qi:C][oj:B][rh:A]
(;B[rh]
C['A *' is correct, 'B' is too easy for Black.

Black would also play this variation, if the triangled stone
was on the squared position instead, showing and using the mistake
of White 2.]
LB[pi:2][mi:B][oj:A]TR[qm]MA[qn]
(;W[oj]C['A *' is correct, 'B' unnecessarily helps White.]
LB[ok:B][om:A]
(;B[om]C[
* GOOD VARIATION *];W[qg]C[Continuation for White.];B[qh];
W[og])

(;B[ok];W[nk])
)

(;W[mi])
)

(;B[oj];W[ni];B[rh]C['A' is correct, 'B' is not recommended.]
LB[nj:B][li:A]
(;W[li])

(;W[nj];B[nk];W[mk];B[mj]C[Depends on the ladder];W[lj])
)

(;B[qi];W[pg]C['A' is better than 'B'.]LB[qh:B][nk:A]
(;B[nk];W[lh]C[White later plays A.]LB[qh:A])

(;B[qh];W[mg]C[Black overconcentrated.])
)
)

(;W[ni]C['A' or 'B' punish White.]LB[ph:B][oi:A]
(;B[oi];W[oh];B[oj];W[nh];B[qg])

(;B[ph])
)
)

(;B[ni];W[pj];B[qk];W[nj];B[mj];W[nk])

(;B[nj];W[pj];B[qk];W[ni];B[mi];W[nh])
)

(;AB[pd][pp];W[oj]
C['A *', 'B *' and 'C *' are joseki.
If 'A *', choose the side, which gives more territory and follow-ups
into the center and where your opponent would like to play. After
'B *' White develops strength in the center. 'C *' makes territory
and leaves Black the choice of direction but no aji or tricks.
'C *' is less preferable than 'A *' and 'B *'.
'D' is extremly secure and anxious.
'E' lets White have a simple attack.
'F' is bad shape.
'G' is possible if Black is very strong all around.
'H' emphasizes the center not caring for the side.]
LB[ni:H][mj:G][pi:F][qg:E][qh:D][pj:C][oi:B][ph:A]
(;B[ph]
C[
* GOOD VARIATION *

'A' can be good, if Black is safe on both sides. 'B' depends
on the ladder.
'C *' is joseki to destroy Black territory.
'D' is a special strategy if the center is most important.
If the upper corner is secured by a shimari, 'D' is correct.
'E' is too soft.
'F' can be good as part of a center moyo.
'G' shows follow-ups for Black.
]
LB[dp:G][lj:F][nh:E][oh:D][qk:C][pl:B][ol:A]
(;W[ol];B[ql];W[lk])

(;W[pl];B[ok]
C[If White made a mistake and Black has the ladder, Black can cut.])

(;W[qk]
C['A *' is joseki.
'B' is esp. good with the ladder.
'C' helps White making territory.
'D' takes sente without fighting.
If White 4 was wrong because the center is more important than
the side, Black punishes on 'E'.]
LB[qk:4][ni:E][qi:D][pj:C][pk:B][rk:A]
(;B[rk]
C['A *' is joseki.
After 'B' White is heavy, after 'C' White has unsuccessful shape.]
LB[ql:C][pk:B][rj:A]
(;W[rj]
C[Sacrifice for sente moves which settle White.
'A *' is joseki, 'B' depends on the ladder.
'C' makes a fight, which is not bad for Black, possible. 'D'
is possible.
 'E' invites a territorial loss.]
LB[pk:E][qi:D][pj:C][ql:B][ri:A]
(;B[ri]C['A *' is joseki, 'B' is a trick play.]LB[qi:B][pj:A]
(;W[pj]
C['A *' is joseki, 'B' is a ko variation, if Black doesn't want
to White another sente move.]
LB[sj:B][qi:A]
(;B[qi];W[rl];B[sj]C['A *', 'B' or 'C' are good.]LB[qm:C][ql:B][pl:A]
(;W[pl]C[
* GOOD VARIATION *])

(;W[ql])

(;W[qm])
)

(;B[sj];W[qi]C['A' and 'B' start the ko. 'C' is gote.]
LB[rj:C][ql:B][qh:A]
(;B[qh])

(;B[ql])

(;B[rj];W[ql];B[pi]C[Necessary to eliminate bad aji.])
)
)

(;W[qi]C['A' is correct, 'B' is getting tricked.]LB[sj:B][pj:A]
(;B[pj];W[pi]C['A' takes territory for influence, 'B' starts a fight.]
LB[sj:B][pk:A]
(;B[pk];W[qh];B[rh];W[ok];B[pl];W[oh])

(;B[sj];W[pk];B[rj];W[qh];B[ok])
)

(;B[sj];W[pj])
)
)

(;B[ql]C['A' if the ladder is White, 'B' if the ladder is Black.]
LB[qi:B][pk:A]
(;W[pk];B[ri];W[rl];B[sj];W[qm])

(;W[qi];B[pk];W[pj];B[qk];W[pi];B[oh])
)

(;B[pj]C['A' settles White, 'B' and 'C' start the fight.]
LB[ri:C][pk:B][rl:A]
(;W[rl];B[pk];W[ql];B[ri])

(;W[pk];B[rl])

(;W[ri];B[rl])
)

(;B[qi]C['A' or 'B'.]LB[ql:B][rl:A]
(;W[rl];B[pk];W[ql];B[ok])

(;W[ql])
)

(;B[pk]C['A' or 'B' are ok, 'C' is bad.]LB[qi:C][pj:B][ql:A]
(;W[ql];B[pj];W[ri])

(;W[pj]C['A' is correct, 'B' helps White.]LB[qi:B][ql:A]
(;B[ql];W[qi])

(;B[qi];W[ql])
)

(;W[qi];B[pj])
)
)

(;W[pk];B[rl])

(;W[ql];B[pj];W[ok];B[rl])
)

(;B[pk];W[pj]C['A' with the ladder, 'B' if the ladder is White.]
LB[ql:B][qi:A]
(;B[qi];W[ql];B[ok])

(;B[ql]
C[White makes a position with 'A' on the lower, with 'B' on the
upper side.]
LB[qi:B][rk:A]
(;W[rk];B[qi];W[pl];B[ok];W[qm])

(;W[qi])
)
)

(;B[pj];W[pk];B[ok]C['A' is correct, 'B' is a mistake.]LB[pm:B][rj:A]
(;W[rj];B[ri])

(;W[pm];B[nk];W[oi];B[pg])
)

(;B[qi]C['A' is light, 'B' is thick.]LB[pk:B][ol:A]
(;W[ol])

(;W[pk])
)

(;B[ni])
)

(;W[oh]
C['A' makes the top right corner big, 'B' avoids strenghening White.]
LB[pg:B][og:A]
(;B[og]C['A' or 'B'.]LB[pi:B][nh:A]
(;W[nh]C['A' and 'B' are correct, 'C' unnecessarily is gote.]
LB[pg:C][pi:B][ng:A]
(;B[ng]C['A' is correct, 'B' is a mistake.]LB[mh:B][mg:A]
(;W[mg]C['A' is correct, 'B' is an overplay.]LB[mh:B][pg:A]
(;B[pg];W[lh]C[White A has become attractive.]LB[qk:A])

(;B[mh];W[pi])
)

(;W[mh];B[mg]C[Black makes territory on the 7th line.])
)

(;B[pi]C['A', 'B' or 'C'.]LB[ng:C][nl:B][mk:A]
(;W[mk])

(;W[nl])

(;W[ng];B[of]C['A' or 'B'.]LB[nl:B][mk:A]
(;W[mk])

(;W[nl])
)
)

(;B[pg])
)

(;W[pi];B[qi];W[pg];B[qh];W[nh];B[ng];W[mg];B[pf];W[lh]
C[White A has become impossible.]LB[qk:A])
)

(;B[pg]
C[White goes to the center onto or near 'A'. He aims at B later.
Playing 'B' now is too early.]
LB[qk:B][li:A]
(;W[li])

(;W[qk]C['A' is correct, 'B' and 'C' are mistakes.]
LB[rk:C][pk:B][pj:A]
(;B[pj];W[pk];B[ok])

(;B[pk];W[pj];B[ql];W[qi];B[rk];W[rj]C['A' or 'B'.]LB[ri:B][qk:A]
(;B[qk];W[pi])

(;B[ri])
)

(;B[rk];W[rj];B[ri]C['A' or 'B'.]LB[qi:B][pj:A]
(;W[pj]C['A' is correct, 'B' is bad.]LB[qi:B][sj:A]
(;B[sj];W[qi];B[rj];W[ql])

(;B[qi];W[rl])
)

(;W[qi];B[sj];W[pj];B[rj];W[ql])
)
)
)
)

(;AE[pd]AB[od][qd];W[oh];B[pg];W[qk];B[rk];W[rj];B[ri];W[pj]TR[oh][pg]
LB[sj:A][qi:B]
C[After the triangled exchange, 'A' is correct, 'B' wrong.
]
(;B[sj];W[qi];B[rj];W[ql])

(;B[qi];W[rl];B[sj];W[om])
)

(;W[nh]C[Black threatens A.]LB[ni:A])

(;W[lj])

(;W[dp]C['A' or 'B'.]LB[ok:B][ni:A]
(;B[ni])

(;B[ok])
)
)

(;B[oi]
C['A *' is joseki to develop the center.
'B' is a variation to prevent Black territroy.
C is a possibility after some invasions in the upper right corner.]
LB[pi:C][pj:B][ni:A]
(;W[ni]C['A *' is joseki, 'B' is sometimes possible.]LB[oh:B][pi:A]
(;B[pi]
C['A *' is the usual joseki, 'B' emphasizes the center.
'C' starts a fight which can be possible.]
LB[nh:C][mj:B][nj:A]
(;W[nj]
C[
* GOOD VARIATION *

Black makes territory on the upper side with 'A' or on the lower
side with 'B', 'C' or 'D'.
'E' shows White's follow-ups.]
PL[2]LB[dp:E][ql:D][pl:C][pk:B][nh:A]
(;B[nh];W[mh]C['A' is usual. 'B' takes sente for influence.]
LB[mg:B][ng:A]
(;B[ng]C['A' or 'B'.]LB[qk:B][mg:A]
(;W[mg];B[nf]
C[If Black 11 is better on the circled position, White does not
play 10.]
LB[mg:10][nf:11]CR[mf])

(;W[qk];B[rk];W[ql])
)

(;B[mg];W[ng];B[oh];W[lh];B[lg];W[kg];B[nf];W[kh])
)

(;B[pk];W[ng])

(;B[pl];W[ng])

(;B[ql];W[ng])

(;B[dp]
(;W[ng])

(;W[qk])
)
)

(;W[mj]LB[ok:B][nh:A]
(;B[nh];W[mh];B[mg];W[ng];B[oh];W[lh];B[lg];W[kg];B[nf];W[kf]
C[White A has become less dangerous.]LB[qk:A])

(;B[ok];W[pk]C[Later.];B[pj];W[ol])
)

(;W[nh]C['A' is correct, 'B' is submissive.]LB[og:B][nj:A]
(;B[nj])

(;B[og];W[nl])
)
)

(;B[oh];W[pj];B[qi]C['A' leads to a necessary fight, 'B' is too nild.]
LB[pl:B][qk:A]
(;W[qk]
C['A' is necessary. The following fight will prove the value of
Black 5.
Avoiding the fighr with 'B' or 'C' is too fearful.]
LB[oh:5][rk:C][qg:B][nj:A]
(;B[nj]C['A' or 'B'.]LB[pl:B][pi:A]
(;W[pi];B[ph];W[qh];B[rk];W[ql];B[rh];W[qg];B[rl];W[qm];B[mi])

(;W[pl];B[pi];W[mi];B[nk];W[ol])
)

(;B[qg];W[nj])

(;B[rk];W[ql];B[rl];W[qm];B[nj];W[mi]C[White aji at A.]LB[pi:A])
)

(;W[pl];B[qk];W[nl])
)
)

(;W[pj];B[pi];W[qk]
C['A' is correct. 'B' is an overplay. 'C' is not recommended.
'D' is inferior.]
LB[ri:D][nj:C][pk:B][qi:A]
(;B[qi]C['A' is correct, after 'B' White gets heavy.]LB[pl:B][nj:A]
(;W[nj])

(;W[pl];B[nj])
)

(;B[pk]C['A' or 'B'. White settles, no dependency on a ladder.]
LB[ql:B][pl:A]
(;W[pl];B[ok];W[nj])

(;W[ql])
)

(;B[nj]C['A' leads to a fight, 'B' avoids it.]LB[rj:B][qi:A]
(;W[qi];B[rj];W[rk];B[ri];W[qh];B[rh];W[ni])

(;W[rj];B[qi];W[pl])
)

(;B[ri];W[rj];B[qi];W[nj])
)
)

(;B[pj]C['A *' is correct, 'B' is not recommended.]LB[oh:B][oi:A]
(;W[oi]
C['A *' is correct. 'B' makes less territory and gives White more
influence.]
LB[ph:B][ok:A]
(;B[ok];W[nk]
C['A *' is usual. 'B' is possible. 'C' leads to a disadvantageous
fight.]
LB[nj:C][nl:B][ol:A]
(;B[ol]C[
* GOOD VARIATION *

White follow-ups are 'A' to 'D'.]
LB[mj:D][nl:C][pg:B][ph:A]
(;W[ph])

(;W[pg])

(;W[nl])

(;W[mj])
)

(;B[nl];W[ol];B[pk]C['A' is usual, 'B' starts a fight.]LB[om:B][mk:A]
(;W[mk])

(;W[om])
)

(;B[nj];W[pi];B[qi];W[pg];B[qh];W[ol];B[pk];W[ng])
)

(;B[ph]
C['A' is correct.
'B' is correct, if there is an additional Black stone on the
triangled position.]
LB[ok:B][ol:A]TR[pn]
(;W[ol])

(;AB[pn];W[ok])
)
)

(;W[oh]C['A' is correct, 'B' misses the chance of punishing White.]
LB[qh:B][ok:A]
(;B[ok];W[nj];B[nk]C[White heavy.])

(;B[qh];W[ok])
)
)

(;B[qh]C[White A is no more a big threat.]LB[qk:A];W[qk];B[pk];W[pj];
B[ql]
C['A' splits Black who secures territory on both sides.
'B' needs the ladder.]
LB[rk:B][qi:A]
(;W[qi];B[rk];W[rj];B[qk];W[pi];B[rh];W[ri];B[ph])

(;W[rk];B[rj];W[rl]
C['A' if the ladder is Black. 'B' if the ladder is White.]
LB[pl:B][qm:A]
(;B[qm];W[pl];B[ok];W[pm])

(;B[pl]C[Fight in Black's favor.])
)
)

(;B[qg];W[qk]C['A' is being split, 'B' is being pressed down low.]
LB[rk:B][pk:A]
(;B[pk];W[pj];B[ql];W[qi];B[rk];W[rj];B[qk];W[qh];B[pg];W[oh])

(;B[rk]C['A' or 'B'.]LB[rj:B][pk:A]
(;W[pk];B[rl];W[qi];B[ri];W[pj];B[rj])

(;W[rj];B[ri];W[pj])
)
)

(;B[pi];W[oi]C['A' bad shape, 'B' is slow.]LB[ph:B][oh:A]
(;B[oh];W[nh];B[og];W[qk];B[rk])

(;B[ph];W[pl])
)

(;B[mj])

(;B[ni];W[oi];B[oh])
)

(;AB[kd][pd]AW[qp][oq];W[oi]
C['A *' prevents White pressing down on the lower side, White presses
on the upper side.
'B' has the same idea as 'A', but an a whole board thinking.
'C' is a good preparation before playing 'A'.
'D' is the contrary of 'A', prevents White pressing down on the
upper side.
'E' starts fighting, Black needs both ladders.
'F' is a good variation.]
LB[pi:F][oj:E][ph:D][qo:C][qm:B][pk:A]
(;B[pk]
C[Before continuing the joseki, Black likes to make an extension
onto one of the triangled stones.
'A *' presses down. 'B' defends the center, needs the ladder.
'C' doesn't need the ladder, but doesn't close off the center.]
LB[ok:C][nk:B][qi:A]TR[qn][qo]
(;W[qi];B[ri];W[qh];B[rh]
C['A *' cuts the side.
'B' emphasizes the center, 'C' leaves too many cuts.]
LB[ok:C][nj:B][qf:A]
(;W[qf]C[
* GOOD VARIATION *

Black aims at A or defends on B.]
LB[qe:B][nj:A])

(;W[nj]C['A' for territory or 'B' for attack.]LB[nk:B][qg:A]
(;B[qg];W[ol])

(;B[nk])
)

(;W[ok]C['A' is correct, 'B' is not recommended.]LB[ol:B][oj:A]
(;B[oj];W[nj];B[pj])

(;B[ol];W[nk])
)
)

(;W[nk]C['A' with a White ladder, 'B' with a Black ladder.]
LB[nj:B][ph:A]
(;B[ph])

(;B[nj])
)

(;W[ok];B[ol];W[nk]C['A' or, if White can't block, 'B'.]LB[nl:B][pm:A]
(;B[pm])

(;B[nl]C['A' if Black 7 was correct, 'B' if it wasn't.]
LB[nl:7][ml:B][lk:A]
(;W[lk];B[ml];W[li])

(;W[ml]C['A' after Black 7 was wrong, 'B' if White 8 was an overplay.]
LB[ml:8][nl:7][mk:B][pm:A]
(;B[pm];W[lk])

(;B[mk];W[mi];B[lk];W[pl];B[pm];W[ql];B[qm];W[rk])
)
)
)
)

(;B[qm];W[ph];B[nd])

(;B[qo];W[po];B[qn];W[rp];B[pn];W[oo]C['A' or 'B'.]LB[oj:B][pk:A]
(;B[pk])

(;B[oj];W[pj];B[pi];W[pk];B[qk];W[ql];B[pl];W[ok];B[ol];W[nk];B[rl];
W[ph];B[qi];W[nh];B[nl];W[mk])
)

(;B[ph];W[qc];B[qd];W[pc];B[oc];W[ob]C['A' is better than 'B'.]
LB[nc:B][nb:A]
(;B[nb];W[nc];B[od];W[mb];B[nd];W[na];B[mc])

(;B[nc];W[nb];B[mc];W[rd];B[re];W[rc];B[qf];W[pk])
)

(;B[oj]
C['A' if White has the ladder to the top, 'B' if White has the
ladder to the bottom, 'C' without any ladder.]
LB[pi:C][pj:B][nj:A]
(;W[nj]
C['A' depends on the ladder, 'B' gives White a good development.]
LB[ok:B][ni:A]
(;B[ni];W[pj];B[ok]
C['A' with a Black ladder, 'B' with a White ladder.]LB[oh:B][pi:A]
(;W[pi];B[pk];W[qi];B[qk])

(;W[oh];B[pk];W[mi])
)

(;B[ok]C['A' or 'B' are ok.]LB[qi:B][pi:A]
(;W[pi];B[qi];W[qh])

(;W[qi];B[ni];W[oh];B[rj];W[ne]C[White sabaki.])
)
)

(;W[pj]C['A' with a White ladder, 'B' is a Black ladder.]
LB[pi:B][pk:A]
(;B[pk];W[pi];B[qk];W[mi])

(;B[pi];W[pk];B[qi];W[nj])
)

(;W[pi]C['A' is correct, 'B' leaves too many cuts.]LB[qi:B][pj:A]
(;B[pj];W[ni];B[rh])

(;B[qi];W[pj];B[pk];W[qh])
)
)

(;B[pi]C['A' or 'B' are possible.]LB[oh:B][oj:A]
(;W[oj];B[oh];W[nh];B[ql])

(;W[oh];B[oj];W[nj];B[ni]C[This move depends on the ladder.])
)
)

(;AB[kd][pd]AW[qp][oq];W[ni]
C['A *' is correct, 'B' is questionable. 'C' is possible. 'D' or
'E' are possible.]
LB[qm:E][pf:D][pi:C][ph:B][oj:A]
(;B[oj]
C['A *' to make a position in the center, 'B' to cut deeper into
the Black position.]
LB[ph:B][nj:A]
(;W[nj]C['A *' is correct, 'B' helps White to build influence.]
LB[oi:B][ok:A]
(;B[ok]C['A *' is correct, 'B' is questionable.]LB[nk:B][ml:A]
(;W[ml]C[
* GOOD VARIATION *];B[nd])

(;W[nk];B[nl])
)

(;B[oi]C['A' or 'B'.]LB[nh:B][nk:A]
(;W[nk];B[nh];W[qc])

(;W[nh];B[nk])
)
)

(;W[ph]C['A' starts a fight, 'B' is possible.]LB[nj:B][oi:A]
(;B[oi];W[oh];B[nh])

(;B[nj];W[mi];B[mj];W[li];B[kk])
)
)

(;B[ph]C[White is light and can invade the Black corner.])

(;B[pi]C[White can invade the Black corner, Black aims at A.]LB[nk:A])

(;B[pf];W[pi];B[qi];W[pj];B[qk];W[mg]C[White aims at A.]LB[qh:A])

(;B[qm])
)

(;AB[oc][jd][qd][oj]AW[ql][op][qp][kq];W[oh]
C['A' makes territory, 'B' attacks.]LB[mj:B][qh:A]
(;B[qh];W[oe])

(;B[mj];W[qh])
)

(;AB[pd][pf]AW[nc][kd][qm][pp];W[pg]
C['A *' is a simple attack.
'B *' is a complicated attack.
'C' is too soft.
'D *' takes territory for influence, White can reverse the result.
'E' is bad.]
LB[oj:E][qg:D][qf:C][og:B][of:A]
(;B[of]
C['A' in this position, 'B' if Black has territory on the lower
half of the right side.]
LB[oj:B][pi:A]
(;W[pi];B[pj]C['A' pulls Black a line. 'B' doesn't.]LB[oi:B][ni:A]
(;W[ni];B[oj]C['A' is correct, 'B' is too thin.]LB[ng:B][oi:A]
(;W[oi]C[
* GOOD VARIATION *];B[mk]
C[This continuation may be possible.];W[ol];B[nj];W[mi];B[kk])

(;W[ng];B[qg])
)

(;W[oi])
)

(;AB[qn]AE[qm]AW[nq];W[oj])
)

(;B[og]C['A *' is joseki, 'B' and 'C' are variations.
'D' is bad.]
LB[qg:D][qf:C][pi:B][ph:A]
(;W[ph]
C['A *' is joseki.
'B' risks a counterattack.
'C' aims to connect.
'D' weakens Black 1 and is wrong.]
LB[qj:1][oh:D][qf:C][oc:B][of:A]
(;B[of]
C['A' in this position, 'B' if Black has an extension in the lower
half.]
LB[pj:B][oh:A]
(;W[oh];B[oj];W[mh]C[
* GOOD VARIATION *])

(;AB[qn]AE[qm]AW[nq];W[pj];B[pk];W[oj])
)

(;B[oc]C['A' defends, 'B' is a counterattack.]LB[qf:B][nd:A]
(;W[nd];B[of])

(;W[qf])
)

(;B[qf]
C['A' in this position, 'B' if Black has an extension in the lower
half.]
LB[pj:B][oh:A]
(;W[oh];B[rh];W[ng];B[of];W[nj]C[Aims at A.]LB[ri:A];B[pk])

(;AB[qn]AE[qm]AW[nq];W[pj];B[pk];W[oj];B[qi];W[rh])
)

(;B[oh];W[pi])
)

(;W[pi]C[Light.];B[qg];W[qi];B[pj];W[oi];B[pl])

(;W[qf]
C[Figthting on 'A' is necessary, 'B' misses the side, 'C' gives
White center moves.]
LB[qe:C][pe:B][ph:A]
(;B[ph]C['A' is better than 'B'.]LB[qg:B][pe:A]
(;W[pe];B[qg]C['A is correct and furikawari, 'B' is a mistake.]
LB[of:B][oe:A]
(;W[oe];B[qe];W[qd];B[rf];W[re];B[qf];W[qc]
C[The loss of the corner isn't bad, because it could be lost by
a sansan-invasion.])

(;W[of];B[oe];W[pg];B[nf];W[pf];B[rf])
)

(;W[qg];B[qe];W[oh];B[of]C['A' is possible, 'B' is bad.]LB[ri:B][pi:A]
(;W[pi];B[qh];W[qi];B[rh];W[ri])

(;W[ri];B[oi];W[nh];B[qh];W[rh];B[rj]C[White dead.])
)
)

(;B[pe];W[ph])

(;B[qe];W[of];B[pe];W[ph])
)

(;W[qg];B[qf];W[pi];B[qi];W[ph];B[pl])
)

(;B[qf]C['A' or 'B' are ok.]LB[qh:B][ng:A]
(;W[ng])

(;W[qh])
)

(;B[qg];W[qh]
C['A *' is joseki.
'B' is too anxious.
'C' fails to connect immediately and starts a fight..]
LB[rh:C][qf:B][ph:A]
(;B[ph]C['A *' is joseki.
'B' gives Black thickness for territory.]
LB[pi:B][og:A]
(;W[og]
C['A *' is joseki, 
'B' is bad as White gets a ponnuki.
'C' gives a low position or a fight.
'D' is bad.]
LB[of:D][rh:C][qf:B][oh:A]
(;B[oh]C['A *' is correct.
'B' is a trick play.]LB[qi:B][qf:A]
(;W[qf];B[rg]
C['A *' takes influence leaving aji giving territory.
'B' takes the corner for the side giving Black good shape, but
fails with an additional Black stone on the triangled position..
'C *' takes territory giving influence.]
LB[qe:C][pe:B][ng:A]TR[qc]
(;W[ng];B[rf];W[nh];B[oj]
C[
* GOOD VARIATION *

Later, White can close the center with 'A' or use his side-and-corner-aji
on 'B'.]
LB[qe:B][nk:A]
(;W[nk])

(;W[qe];B[pe];W[rh]C['A' takes the corner, 'B' takes the side.]
LB[qi:B][qd:A]
(;B[qd];W[rj])

(;B[qi];W[re])
)
)

(;W[pe];B[of];W[oe];B[ng]
C['A' is correct. If the varition is wrong because of an additional
Black stone on the triangled position, only 'B' is possible but
fails.]
LB[qe:B][qd:A]TR[qc]
(;W[qd];B[qc]C['A' keeps the corner, 'B' fails.]LB[rc:B][rd:A]
(;W[rd];B[rc];W[od])

(;W[rc];B[rd];W[qe];B[rb];W[sc];B[sd];W[qb];B[pc];W[pb];B[sb];W[rc];
B[sc])
)

(;AB[qc]AW[pb];W[qe];B[rd];W[re];B[qb];W[ob];B[rb]C[Blacak lives.];
W[sc]C[Proof of life.];B[sd];W[se];B[qa])
)

(;W[qe]C['A *' is joseki, 'B' is a mistake.]LB[rh:B][pe:A]
(;B[pe];W[rh];B[ng];W[of]
C['A *' is joseki, 'B' fails to hurt the triangled stones.
'C' captures, if the squared stone is Black.]
LB[oe:C][ne:B][nf:A]TR[nc]MA[kd]
(;B[nf];W[oe];B[nd];W[rf]C['A *' or 'B'.]LB[ne:B][od:A]
(;B[od];W[sg];B[mc]C[
* GOOD VARIATION *])

(;B[ne];W[sg];B[qg];W[rg]
C['A' is correct, 'B' attacks White and is also possible.
'C' is useless.]
LB[od:C][qc:B][mc:A]
(;B[mc])

(;B[qc])

(;B[od]C[White doesn't connect before the endgame.])
)
)

(;B[ne])

(;AB[kd];B[oe];W[nf];B[mf];W[ne];B[nd];W[me];B[le];W[md];B[mc];W[od];
B[ld];W[nd];B[nb];W[oc];B[pc])
)

(;B[rh];W[pe];B[of];W[ng])
)
)

(;W[qi]C['A' is correct, 'B' is getting tricked.]LB[pj:B][pi:A]
(;B[pi];W[rj];B[ng];W[of];B[ne];W[qf];B[rg])

(;B[pj];W[qf];B[rg];W[rf])
)
)

(;B[qf];W[pi];B[rh];W[oh];B[qi])

(;B[rh];W[qf]C['A' is correct, 'B' is a mistake.]LB[qi:B][rg:A]
(;B[rg]C['A' to press, 'B' to fight.]LB[qe:B][pe:A]
(;W[pe];B[qe];W[of];B[rf];W[qd];B[pf];W[oe];B[qc])

(;W[qe])
)

(;B[qi];W[rg];B[qh];W[pe];B[qe];W[of];B[rf];W[qd];B[re];W[pc];B[pf];
W[od])
)

(;B[of];W[pi];B[oh];W[ng];B[qi];W[rh])
)

(;W[pi];B[og]C['A' is correct, 'B' is bad.]LB[oh:B][qi:A]
(;W[qi];B[oi];W[pj])

(;W[oh];B[pg];W[qi];B[oi];W[nh];B[ni]
C[White saves some stones on 'A' or 'B' and loses the other stones.]
LB[mh:B][pj:A]
(;W[pj];B[mh];W[ng];B[mf])

(;W[mh];B[pj])
)
)
)

(;B[qf];W[ph])

(;B[rh];W[rg];B[qf];W[ri];B[ph];W[qi];B[pi];W[og])
)

(;B[oj];W[qf];B[qe];W[of];B[pe])
)

(;AB[pd][pf][pn][pp]AW[nc][kd][kp][nq];W[pj]
C['A *' secures territory.
'B' is not aggressive enough.]
LB[qi:B][pi:A]
(;B[pi];W[qk]
C['A *' or, with the ladder 'B'.
'C' gives White more thickness.]
LB[oj:C][pk:B][qi:A]
(;B[qi]
C['A *' is joseki.
'B' emphasizes the center of the lower right side.
'C' is light.]
LB[om:C][oj:B][pk:A]
(;W[pk]
C[
* GOOD VARIATION *

Securing more territory on 'A' is correct. Black can prevent
White influence on 'B' before 'A'.
Fighting on 'C' is an overplay.]
LB[nk:C][ni:B][pb:A]
(;B[pb]C[White makes influence on 'A' or attacks on 'B', 'C' or 'D'.]
LB[rn:D][qq:C][pr:B][oi:A]
(;W[oi];B[oh];W[ni];B[nh];W[nk]C['A' or 'B'.]LB[mi:B][pr:A]
(;B[pr];W[mh])

(;B[mi];W[pr])
)

(;W[pr])

(;W[qq])

(;W[rn])
)

(;B[ni];W[nk];B[pb])

(;B[nk];W[oi];B[oj];W[oh];B[pg];W[om])
)

(;W[oj])

(;W[om];B[np];W[mp];B[no])
)

(;B[pk];W[oj]C['A' is correct, 'B' and 'C' are mistakes.]
LB[oi:C][ok:B][qi:A]
(;B[qi]
C['A' is sabaki if Black has the ladder.
'B' initiates the ladder.]
LB[pl:B][pm:A]
(;W[pm]C['A' is correct, 'B' gives White much influence.]
LB[on:B][ok:A]
(;B[ok];W[qn])

(;B[on];W[ok];B[pl];W[ol];B[ql];W[qm];B[rl];W[rm];B[rk];W[om])
)

(;W[pl])
)

(;B[ok];W[qi];B[rj];W[nj];B[qh];W[nk];B[ql]C[White has influence.])

(;B[oi];W[qi];B[rj];W[pl];B[ok];W[nj];B[ql];W[ph];B[oh];W[og])
)

(;B[oj];W[pk];B[qi];W[ok])
)

(;B[qi];W[pl]C['A' is better than 'B'.]LB[oj:B][pk:A]
(;B[pk];W[ok];B[qk])

(;B[oj];W[ok];B[pi];W[nj];B[pk];W[qk])
)
)
)

)
