(;
GM[1]FF[4]VW[]AP[Many Faces of Go:11.0]
SZ[19]
HA[0]
ST[1]
PC["The Most Difficult Problem Ever"]
KM[0.0]
RU[Japanese]
SO[Created by Inoue Dosetsu Inseki (1646 - 1719)]
US[Compiled by Thomas Redecker]
EV[Igo Hatsuyoron]
CP[2005-2009 Thomas Redecker]
RO[Problem 120]
AB[ra][pe][oe][le][lc][lb][ld][me][hb][fc][fe][de][ce][bf][bd]
[of][og][oh][oi][ph][qh][rh][sh][pi][ni][mi][lj][lk][rk][sk]
[ql][pl][qm][rm][sp][sq][qq][oo][pp][pq][pr][ps][os][ns][nr]
[ko][mn][aj][ak][al][am][bm][bs][cr][bp][cp][co][dn][ep][fq]
[fo][fn][em][el][ek][fj][dh][di][il][mf]
AW[qa][rb][qc][qe][re][od][nd][mb][jb][ib][hc][cd][jd][ke][kg]
[lg][ng][pf][nj][oj][pj][ok][qj][ri][si][rl][sl][sm][rn][ro]
[so][sn][rq][qp][qo][on][op][or][mr][ms][ah][bg][cg][dg][df]
[ff][gg][hg][hi][ki][jj][jn][jm][jl][jk][hm][hp][ir][kp][lp]
[mp][bn][cn][ap][ar][en][eq][bj][cj][dk][dl];B[po]
C[Primary topic of this problem is the status of the big Black \
group in the upper right, but action starts in the lower right \
corner.]
;W[rr];B[qk];W[ml]
C[White tries to escape into the centre, ...]
;B[ll];W[mm];B[lm];W[nn]
;B[no]
C[... what Black can prevent successfully.]
;W[mo];B[ln];W[pn];B[qn];W[rp];B[ol];W[nl];B[nm]
C[Throwing in at 17 is necessary for Black, ...]
;W[om]
(;B[mj]
C[... but he should perhaps refrain from doing so again with this \
move.

[ see variation \]

Explanations on this second Throw-in follow in a separate chapter. \
We were unable to find a sequence there after ending badly for \
Black.

To provide a clear distinction between our work and the "official" \
solution, all our amateurs' attempts will be shown after this \
second Throw-in.

The two White groups on the right side and the Black one between \
them form part of a temporary Seki. The big Black top right group \
can only get one eye. So Black must try to live with his stones \
at the bottom or at least get enough liberties, what would enable \
him to capture the White stones in the bottom right corner, resolving \
the temporary Seki.]
;W[nk]
(;B[rj]
C[The exchange of Black 21 ...]
;W[qi]
C[... and White 22 is very important at this moment. Otherwise \
White would have the option to play at 21 herself, forcing Black \
to fill in one liberty of his upper group with a move at 22 - \
and this additional Black stone may be in danger of being captured \
some time in the future, forming part of White's territory.]

(;B[np]
C[B 23:
Black cannot play on the 2-1-point in the corner. 

[ see variation \]]

(;W[rs]
C[This move should not be played at 25 by White (Black would be \
forced to answer at 24). 

[ see variation \]]
;B[sr];W[oq]
(;B[mq]
C[Black has to run for the life of his group with 27, as he is \
unable to capture the three White stones instead. 

[ see variation \]]

(;W[lr]
C[White cannot give Atari at 29.

[ see variation \]]
;B[lq];W[kr];B[kq];W[jp];B[jq];W[jr];B[iq];W[hq]
C[Black's path to the left is now stopped by White.]

;B[gr]
C[After the Kikashi of 37 Black runs upwards.]
;W[hr];B[ip];W[jo];B[io]
(;W[ho]
C[White must never allow the Black chain of stones to have more \
than two liberties. A Geta will be too slow here. 

[ see variation \]]
;B[in]
(;W[hn]
C[White cannot block Black's path successfully, too. 

[ see variation \]]
;B[im];W[hl]
C[To try a Geta with this move, ...]
;B[ik];W[hk]
C[... or this one will not be successful, as already shown in the \
variation for White 42.]
;B[ij]
(;W[hj]
C[Even some moves later White will have no success in blocking \
Black's path. 

[ see variation \]]
;B[ii];W[ih];B[ji];W[kj];B[jh];W[kh];B[jg];W[jf]
;B[ig]
(;W[hh]
C[White is unable to block above 59 with this move, as she will \
not win the following Ko.

[ see variation \]]
;B[if];W[ie];B[hf];W[he];B[gf]
C[Update 2009:
This is the last moment Black can play the "bad shape" move at \
A in the top right corner, which probably wins him the game.
But: This propability hat not been proven by professionals yet.

The variations following a Black move at A instead of 65 here \
are shown after the second Throw-in with Black 19 as Black 67.]
LB[rg:A]
;W[ge]
C[Black is shut in now.]
;B[fg]
C[Therefore Black has to cut the White troops and ...]
;W[ef]
;B[fh]
C[... to save his cutting stone.]

(;W[hs]
C[White must live on the lower side. She cannot go for the Black \
top right group. 

[ see variation \]]

(;B[ee]
C[Black's only option left is to try to kill the White group on \
the left. Black cannot capture the three White stones inside \
his encircled centre group. 

[ see variation \]

Black must protect his top left corner with this move; he cannot \
play on the left side instead. In this case White would answer \
with 71 herself and kill the whole top left Black corner, thus \
winning the game (this is shown as a variation after the "bad \
shape" move in the top right).]

(;W[cm]
C[But on the other side White cannot capture the Black centre group, \
too.

[ see variation \]]
;B[an];W[bo];B[ao];W[aq]
(;B[bi]
C[The obvious idea to look after the three White stones on the \
lower left will end in White life on the left side. 

[ see variation \]]

(;W[ai]
C[The attempt to connect on the third line is condemned to failure.

[ see variation \]]
;B[bh];W[ag]
(;B[bk]
C[May look like more effective one point lower in creating a Dango, \
but that has much of a misjudgement.

[ see variation \]]

(;W[ck]
C[White is denied from throwing in.

[ see variation \]]
;B[bl]
C[Black has built an oversized Nakade on the left.]
;W[cl]
C[Even after White captures nine Black stones, surprisingly enough \
she is unable to get two eyes.]

(;B[ak]
C[On the other side, Black is unable to reduce the the space of \
White's eye to a smaller one.

[ see variations \]]
;W[aj];B[bl];W[ao];B[am]
(;W[bk]
C[White has to prevent the "bad shape" move of Black A instead.

[ see variation \]]
LB[rg:A]

(;B[al]
C[What about leaving the scope of action ?

[see variation\]

My question, if this move could be played at 92, is discussed \
later.]
;W[rg];B[pd]
C[Black reduces the White territory in the top right to some extend \
with 93 ...]
;W[pc];B[mc]
C[... and 95.]
;W[nb];B[la]
C[But he cannot go any further after this Sagari, what also destroys \
two points of White territory without affecting the liberties \
of his upper right group.]
;W[qg]
(;B[dj]
C[Any further move in the top right corner would cost him one of \
his life-spending liberties.

[ see variation \]]
;W[nc];B[eg];W[mg];B[cf];W[ne];B[nf];W[kb];B[af]
;W[ka];B[dm];W[kc];B[ci];W[pg];B[ch];W[ma];B[br];W[lf];B[bq]
;W[sg];B[as];W[kn];B[bm];W[an];B[al];W[lo];B[ak];W[li];B[bl]
;W[qd];B[am];W[bm]
(;B[al]
C[Black must make a placement into the centre of the White 4-point-eye \
on the left.

[see variation\]]

(;W[nq]
C[To the surprise of the whole Go world White (who has listened \
carefully to a German Kyu player) now chooses a move for 132 \
that could not have been played successfully for the previous \
sixty moves.

She captures the twenty Black centre stones !

To see what has been assumed so far as the best move for White, \
please ...

[ see variation \]]
;B[mq]
C[Black has to capture the White group in the bottom right corner.]

(;W[oq]
C[A very important placement !

As mentioned already at the end of the variation for Black 99, \
White would be one move behind, should she continue to take liberties \
of the Black top right group with 134. Here Black loses some \
points of territory through the White throw-in. 

[ see variation \]]
;B[qr];W[nq];B[qs];W[ss];B[sq];W[lq];B[sp]
(;W[fb]
C[This Tsuke has been found by Yamada Shinji 4p. It gives White \
a better result in the top left corner than the Atari one point \
to the right, that has been used so far for this move.

[ see variation \]]

(;B[eb]
C[Black is unable to resist.

[ see variation \] 

Please note that the variation contains a Seki. Thus the sequence \
of Yamada Sensei is only possible after the White group on the \
left side securely lives (that means after taking the Black centre \
group off the board).]
;W[gb];B[gc];W[ec];B[fa];W[ha];B[dc];W[fr];B[er]
;W[fs];B[es];W[gs]
(;B[gd]
C[The order of moves is really important here. It would be unfavourable \
for Black to connect his one stone that is in Atari.

[ see variation \]]
;W[hd];B[ed];W[gq];B[fp]
(;W[gj]
C[Is Sente and prevents Black activities in the open space in the \
centre.

[ see variation \]]

(;B[fi]
C[Black must connect.

[see variation\]]
;W[mh]
C[White has Sente to take the last valuable point.]
;B[sr];W[nh];B[pm];W[nm];B[sj];W[kd];B[pk]
;W[md];B[mk]
C[Eventually Black has to take the White stones on the right off \
the board.

W +2.
=====]
)
(;B[mh]
C[Black prevents White from making one point of territory here.]
;W[fi]
C[But White destroys three points of Black territory in return.]
TR[ej][ei][eh]
;B[ei];W[gi];B[sr];W[kd];B[pm];W[nm];B[pk]
;W[md];B[sj];W[nh];B[mk]
C[W +4
=====]
))
(;W[gi]
C[Sente, too, but works only in one direction.]
;B[fi];W[mh];B[gl]
C[Black can now get an additional point in the centre.]
;W[gk];B[gm];W[fk];B[fl];W[kd]
;B[sr];W[md];B[pm];W[nm];B[pk];W[nh];B[sj];W[kk];B[mk]
C[W +1
=====]
))
(;B[gq]
C[The order of moves cannot be changed here, in contrary to the \
correct solution identified in the Weiqi FaYangLun. Black saves \
the endangered stone at the bottom, resulting in a two point \
win.]
;W[gp];B[fp];W[gj];B[fi];W[fd]
C[White reduces the Black territory, resulting in a two point loss \
for Black.]
;B[ed];W[gd]
C[160 is no Black territory any more and the triangled point is \
now White territory.]
TR[fd][hd]
;B[ec]
C[This is the third point Black loses here.]

;W[mh]
C[As before, White gets the last valuable point on the board.]
;B[sr];W[kd];B[pm];W[nm];B[pk];W[md];B[sj];W[nh];B[mk]
C[W +3
=====]
))
(;B[gb]
C[Black tries to capture the single White stone.]
;W[eb];B[gc];W[ec];B[ed];W[gd];B[fd];W[bb];B[bc]
;W[cc];B[ab];W[cb];B[dd];W[ac];B[ad];W[ba];B[dc];W[db];B[fa]
;W[ea];B[ga];W[ia]
C[In the end, all Black efforts result in a Seki, which means zero \
points of territory in the corner and the loss of the game.

W +R
=====]
))
(;W[gb]
C[This Atari starts the combination used so far in the top left \
corner.
You will recognise that Black has one more point of territory \
here compared to the Main Path.]
;B[fb];W[fa];B[ea];W[ga];B[gc];W[ha];B[eb];W[fr]
C[The the sequence continues similar to that in the Main Path.]

;B[er];W[fs];B[es];W[gs];B[gd];W[gq];B[fp];W[gj];B[fi];W[hd]
C[But White ends in Gote, ...]

;B[mh]
C[... what enables Black to make the last valuable move this time. \
But even these two won points do not help Black to turn the tables.]
;W[kd];B[sr];W[md];B[pm];W[nm];B[pk];W[nh];B[sj];W[lh]
;B[mk]
C[Jigo.
=====]
))
(;W[mh]
C[If White continues to take Black liberties ...]
;B[qr];W[nh];B[qs];W[ss];B[sq];W[kd];B[sp];W[md]
;B[sr];W[kk];B[pm];W[nm];B[pk];W[kl];B[sj];W[km];B[mk]
C[... she will finally be one step too late.]
;W[fb]
C[The endgame on the left side is "business as usual".]

;B[eb];W[gb];B[gc];W[ec];B[fa];W[ha];B[dc];W[fr];B[er];W[fs]
;B[es];W[gs];B[gd];W[hd];B[ed];W[gq];B[fp];W[gj];B[fi];W[lq]
C[White closes the remaining gap in the lower right.]

;B[nq]
C[Now it is clearly visible, that White has lost four points in \
the lower right. The marked Black stone is no White prisoner \
and the three marked points are Black territory now.

B +2
=====]
TR[mq][or][oq][op]
))
(;W[pk]
C[This is what has been recognised as correct solution so far.

W 132 forces Black ...]
;B[mk]
C[... to take his own upper right group a liberty at 133. This \
Black stone will White provide an additional point, as the Black \
group in the upper right will be captured and this stone will \
become an additional prisoner.]
;W[gb]
C[White can calm down and start the Endgame on the left side, because

1. She is unable to prevent the loss of the lower right corner, \
even if she has Sente.

2. She can kill the Black stones in the upper right, even if \
she has Gote.]
;B[fb];W[fa];B[ea];W[ga];B[gc];W[ha]
;B[eb];W[fr];B[er];W[fs];B[es];W[gs];B[gd];W[gq];B[fp];W[gj]
;B[fi];W[hd];B[nq]
C[The presence of this single Black stone in the centre of the \
White eye on the left permits Black to capture the three White \
stones on the right now.]
;W[oq];B[ak];W[mh];B[bl];W[am];B[al];W[kd]
;B[ak];W[md];B[qr];W[km];B[qs];W[ss];B[sq];W[kl];B[sp];W[kk]
;B[sr]
C[Again Black is able to capture the White stones in the lower \
right corner.]
;W[nh]
C[So he can get over that White takes the Black groupt in the upper \
right off the board, as she will not win the game either. 

B +3
=====]
))
(;B[nq]
C[Even now Black will not be successful after capturing the three \
White stones inside his belly.]
;W[oq];B[al];W[op]
C[White must plaque the Black centre group to be successful here. \
If she otherwise continues to take liberties of the Black group \
in the upper right, Black would win with three points (it would \
result a change in the order of moves with the variation for \
W 132).]
;B[ak];W[qr];B[bl];W[am];B[al]
;W[ss]
(;B[ak]
C[If Black captures the White stones on the left, ...]
;W[sq]
C[... White gets two eyes on the right with 142 and wins the game \
with ease.

W +R
=====]
)
(;B[sq]
C[If Black prevents this by playing on the right side himself, \
...]
;W[qs]
C[... White will give Atari to the Black centre group.

W +R
=====

Black is one move too late here. It is necessary for Black that \
he has already played a stone into the centre of the White 4-point-Nakade \
on the left, before he can capture the three White stones on \
the right with confidence. But as can be seen in the Main Path, \
White will not be so kind to give Black the opportunity to do \
so.]
)))
(;B[nc]
C[This move is one example, how Black could reduce the White corner \
territory.]
;W[oc];B[ob];W[pb];B[ma]
C[It does not profit Black not to play this stone and to hope that \
White will have problems in approaching the Black group here \
in this area. For White will be able to occopy all other liberties \
of this group or force Black to take one of them by himself.]
;W[oa]
C[Black reduced the White corner territory by three points in Sente. \
But he had lost one liberty by exchanging 99 against White 100.]
TR[nc][oc]
;B[dj];W[na];B[eg]
;W[mg];B[cf];W[ne];B[nf];W[kb];B[af];W[ka];B[dm];W[kc];B[ch]
;W[pg];B[ci];W[sg];B[br];W[kn];B[bq];W[lo];B[as];W[lf];B[bm]
;W[an];B[al];W[qd];B[ak];W[li];B[bl];W[mh];B[am];W[bm];B[al]
;W[nq]
C[White now captures the Black centre group.]
;B[mq];W[pk]
C[And now White uses her option to continue filling Black liberties.]
;B[mk];W[kd];B[qr];W[md];B[qs];W[ss];B[sq]
;W[nh];B[sp];W[kk];B[sr];W[kl];B[pm];W[km]
C[In the end, White is one move ahead in the Semeai.

But if Black does not touch the top right corner as in the Main \
Path, White will not be successful with her option shown here.

W +R
=====]
))
(;B[rg]
C[Another Black move in the top right corner may be this one at \
91 (in the Main Path Black connects the Atari on the left side \
with this move and White plays at this point with her 92). This \
move destroys the three triangled points of White territory without \
hurting Black liberties. White will need five moves to take Black \
liberties in this area but one (instead of three moves before \
– but remember that connecting the open Atari on the left side \
will cost Black one move).]
TR[qf][rf][sf]

(;W[al]
C[Perhaps it may be possible to put aside the question ... 

[ for a "peaceful" White answer see the variation )]
;B[qf];W[mg];B[pg];W[bm]
C[... whether White will be able to win the game after the life-life-situation \
shown on the right, in which the whole bottom right quarter of \
the board will remain in Seki. I suppose that the following Endgame \
will be complicated as the game is extremely close.

I suppose that White is not forced to resolve the Ko with 96. \
Instead, she will be able to start the Endgame in the top left \
at A. This is shown as variation after the second Throw-in.]
LB[gb:A]
;B[gb]
C[I think the decicive question will be whether it would be possible \
for Black to prevent the White endgame in the upper left with \
the Hiki of 97. Please note that this move is Sente against White's \
centre group. This group is now in danger to be reduced to only \
one Eye, what would force White to capture the twenty Black centre \
stones, losing the game. But if White allows the Black move at \
97, she will lose the game, too. This is shown as variation after \
the second Throw-in.]
)
(;W[rf]
C[If White follows a simpler path, she will answer at 92, taking \
one Black liberty. This move makes it also impossible for Black \
to get an Eye here.]
;B[al]
C[So sooner or later Black will have to come back to the left side \
and connect at 93, returning to what will follow the Main Path \
– with one decisive exception:]
;W[pd]
C[As shown here with the move at 94, White will be able to prevent \
one of Blacks Sente plays in the top right corner, resulting \
in a two-point advantage of the triangled points.]
TR[pc][qd]
;B[mc];W[nb];B[la]
C[In my opinion the conclusion is that the best Black can gain \
with this "peaceful" variation is an advantage of only one point, \
what is not enough to turn the tables and to win the game.]
)))
(;W[rg]
C[White must prevent a Black move on this point !]
;B[pd];W[pc];B[mc];W[nb];B[la];W[bk]
C[Now White comes back to the left side. This results in a change \
in the order of moves. White will win by 2 points again.

So the question arises whether it would be possible for Black \
to play that "bad shape" move earlier.

(This question is discussed in detail after B 67 in the variations \
after the second Throw-in.)]
))
(;B[ao]
C[Black throws in.]
;W[bl];B[am];W[al];B[ak];W[aj]
C[White gets two eyes and lives. Black loses the right side and \
the centre.

W +R
=====]
)
(;B[bl]
C[If Black plays on a vital point inside White's shape, ...]
;W[ao];B[am];W[ak];B[al];W[bm]
C[... she gets a Seki which also means that the White group cannot \
be captured anymore.

W +R
=====]
))
(;W[bl];B[cl];W[dm];B[dj];W[do];B[ci]
C[White is unable to connect her two stones.

B +R
=====]
))
(;B[bl]
C[The Nakade may look more compact.]
;W[bk];B[cl];W[dm];B[dj];W[ck];B[bl]
C[But it will turn out that after the capturing of the Black stones \
there are too many vital points inside the White shape. Black \
cannot occupy all of then, so White finally gets a Seki.]
;W[ao];B[am]
;W[ak];B[bm];W[al]
C[W +R
=====]
))
(;W[ci]
C[White attempts to connect on the third line.]
;B[cl]
C[But Black has some Sente moves on the other side, beginning with \
this move.]
;W[dm];B[dj];W[ck];B[ch];W[do]
C[To take one Black stone off the board does not provide much help \
to the White group. She cannot escape the Black encirclement.]
;B[bh]
C[B +R
=====]
))
(;B[br];W[ai];B[bq];W[bk];B[as]
C[Black has success in his intention to capture the three White \
stones in the lower left, ...]
;W[bl]
C[... but White secures one eye in Sente for herself with this \
move. The second eye will arise some moves later.

W +R
=====]
;B[ap];W[ch];B[ci]
;W[bi]
C[W +R
=====]
))
(;W[nq]
C[White captures the twenty Black centre stones.]
;B[mq]
C[Black recaptures.]
;W[oq]
C[White makes the usual placement, but this time ...]
;B[qr];W[nq];B[qs];W[ss];B[sq];W[lq]
;B[sp]
C[... Black wins the Semeai in the corner and the game by a very \
comfortable margin.

Please keep two facts in mind for later:

1. The borders of the White territories are not yet settled.

2. The five Black stones on the left side cannot be captured \
by White.

B +R
=====]
))
(;B[nq]
C[Black captures three White stones.]
;W[oq]
C[This White placement leaves Black helpless, as shown twice before. \
A Black move at A would be answered by White B. At every time \
she wishes, White can take the Black stones off the board.]
LB[qr:A][op:B]
;B[tt];W[op];B[tt];W[qr];B[tt];W[ss];B[sq]
;W[qs]
C[This resolves the Seki on the right, White captures the whole \
right side and wins by a large margin.

W +R
=====]
))
(;W[rg]
C[White starts to reduce the liberties of the Black top right group.]
;B[ks]
C[Prevents two eyes for White at the bottom.]
;W[mc];B[pd];W[pc];B[la]
C[Black gets an additional liberty.

Both of these territory reducing moves (B 73 and 75) could be \
left out here, as they neither have an effect on the Semeai nor \
in principle on the result of the game in this variation.]
;W[mg];B[hs];W[ne]
;B[nf];W[kb];B[gq];W[qg];B[gp];W[pg];B[go];W[sg];B[gn];W[ma]
;B[gm];W[ka];B[gl];W[kc];B[gk];W[md];B[gj];W[kd];B[gi];W[lf]
;B[nq];W[oq];B[gh];W[qd];B[is];W[nh];B[js];W[mh];B[qr];W[li]
;B[qs];W[ss];B[sq];W[kk];B[sp];W[kl];B[sr];W[km];B[pm];W[nm]
;B[pk];W[kn];B[sj];W[lo];B[mk]
C[Black wins the capturing race by one move.

B +R
=====]
))
(;W[if]
C[White blocks Blacks path.]
;B[hh]
C[Black captures the single White stone and gets an additional \
liberty, ...]
;W[gh];B[nq]
C[... which enables him to capture three White stones. Because \
White is hindered to occupy each of the two liberties of the \
chain of Black stones in the centre immediately, this seems to \
be a little bit like the variation for W 42.]
;W[oq];B[qr];W[op];B[qs];W[ss]
;B[sq];W[ih]
C[Guided by the proverb, White takes the Ko at the latest possible \
moment, ...]
;B[or]
C[... but Black has two liberties left.]
;W[oq];B[hh]
C[Finally, Black takes the Ko back. On the whole board there are \
no adequate Ko-Threats for White. So Black will be able to capture \
the White stones in the lower right corner with A, giving White \
two moves in a row wherever she likes.

B + R
=====]
LB[sp:A]
))
(;W[ii]
C[Blocking with White 50 leads to a similar result as blocking \
with White 44.]
;B[hj];W[gj];B[gk];W[gi];B[hs];W[nq];B[mq];W[oq]
;B[qr];W[nq];B[qs];W[ss];B[sq];W[lq];B[sp]
C[B + R
=====]
))
(;W[im]
C[If White tries to confine Black, ...]

(;B[nq]
C[...capturing with 45 is a mistake (as we have seen before).

[ see variation \]]
;W[oq];B[hn];W[gn];B[go];W[gm];B[hs]
C[The White group at the bottom has only one eye, but ...]
;W[qr]
C[... too much liberties left.]
;B[is]
;W[op];B[js];W[ss];B[sq];W[qs]
C[White wins the capturing race in the corner.

W +R
=====]
)
(;B[hn]
C[So Black has to chance the order of moves.]
;W[gn];B[go];W[gm];B[hs]
C[After Black 49, the White group at the bottom is reduced to one \
eye as before.]
;W[nq]
C[But here White eventually will be forced to capture the encircled \
ten Black stones, where after ...]
;B[mq];W[oq];B[qr]
;W[nq];B[qs];W[ss];B[sq];W[lq];B[sp]
C[... it will be Black, who wins the capturing race in the corner \
now.

B +R
=====]
)))
(;W[hn]
C[A Geta is much too slow here.]
;B[nq]
C[The simplest measure for Black now is to capture the three White \
stones.]
;W[oq];B[qr];W[ho];B[qs];W[ss];B[sq];W[in]
;B[sp]
C[Black wins the Semeai in the corner by one move. 

B +R
=====]
))
(;W[lq]
C[White cannot give Atari here, ...]
;B[nq]
C[... because Black will capture the three White stones inside \
his belly.]
;W[lr]
C[If White saves her two stones at the bottom, ...]
;B[oq]
C[... Black secures two Eyes with 31 and vice versa. These two \
points are Miai for Black life, who can resolve the Seki on the \
right now.]
))
(;B[nq]
C[Black captures the three White stones.]
;W[oq];B[mq];W[lr];B[lq];W[kr];B[kq];W[jp];B[jq]
;W[jr];B[iq];W[hq];B[gr];W[hr];B[ip];W[jo];B[io];W[ho];B[in]
;W[im]
C[After blocking Black's escape there are two variations, none \
is good for Black.]

(;B[qr]
C[Going after the White stones in the corner ...]
;W[hn];B[qs];W[ss];B[sq];W[op]
C[... shows Black one liberty short.

W +R
=====]
)
(;B[hn]
C[Black has no future on the left either.]
;W[gn];B[go];W[gm];B[hs]
C[Even if Black prevents two eyes of the White group, ...]
;W[qr];B[is];W[op];B[js]
;W[ss];B[sq];W[qs]
C[... he arrives one step too late, as usual.

W +R
=====]
)))
(;W[sr]
C[There are no statements about this variation in the sources at \
my disposal. The commentary here was worked out together with \
Joachim Meinhardt.]
;B[rs]
C[The Black answer is forced.]
;W[oq]
(;B[mq]
C[It is best for Black to follow the knows course of the Main Path \
here. To capture the three White stones instead will be far more \
time-consuming.

[ see variation \]]
;W[lr]
(;B[qs]
C[Black can immediately attack the White group in the corner with \
this move. Perhaps ist will be more elegant to continue once \
more in the centre before.]
;W[lq];B[sq];W[nq];B[mq];W[oq];B[ss];W[nq];B[qr]
C[Black wins the Semeai in the corner by one move.]
)
(;B[lq]
C[Black sacrifices a second stone in the centre.]
;W[kr]
(;B[qs]
C[Again Black start the Semeai in the corner.

He could follow the Main Path for a while, too, beginning with \
31 at 32, but this would result only in giving away more stones \
to White.

[ see variation \]]
;W[kq];B[sq];W[nq];B[mq];W[oq];B[cm]
C[Black can play Tenuki once in the lower right and ...]
;W[nq];B[ss]
C[... remains one step faster here.]
)
(;B[kq]
C[At any time between 31 and 65 ...]
;W[jp];B[jq];W[jr];B[iq];W[hq];B[gr];W[hr];B[ip]
;W[jo];B[io];W[ho];B[in];W[hn];B[im];W[hl];B[ik];W[hk];B[ij]
;W[hj];B[ii];W[ih];B[ji];W[kj];B[jh];W[kh];B[jg];W[jf];B[ig]
;W[hh];B[if];W[ie];B[hf];W[he];B[gf]
C[... Black can interrupt his flight along the Main Path and capture \
the White group in the lower right corner.]
;W[ge];B[fg]
C[But waiting until the Atari of 67 has been one move too long. \
Black's last chance has been after White 66.]
;W[nq]
C[This is why White takes the Black stones in the centre off the \
board, before Black played the move in the lower right corner.]
;B[mq]
;W[oq]
C[White makes a placement, as usual.]
;B[qs];W[nq];B[ss]
C[The specefic characteristic of this corner causes Black difficulties \
in approaching the White stones.]
;W[lq];B[sq];W[op]
C[Different from the Main Path White here is the decisive step \
faster. She gets the whole right side and wins the game.]
)))
(;B[nq]
C[Second possibility for Black is to capture the three White stones. \
But the following sequence will be much longer that the one shown \
before.

In the first variation this move is possible at any time between \
Black 29 and Black 67, but these variations are more likely to \
belong herein as a change in the order of moves.]
;W[oq]
C[White must prevent two Black eyes. After that move the journey \
starts that is explained in detail in the Main Path.]
;B[mq];W[lr];B[lq];W[kr];B[kq];W[jp];B[jq]
;W[jr];B[iq];W[hq];B[gr];W[hr];B[ip];W[jo];B[io];W[ho];B[in]
;W[hn];B[im];W[hl];B[ik];W[hk];B[ij];W[hj];B[ii];W[ih];B[ji]
;W[kj];B[jh];W[kh];B[jg];W[jf];B[ig]
(;W[hh]
C[White is not successful in trying a Ko instead.

[ see variation \]]
;B[if];W[ie];B[hf];W[he];B[gf];W[ge];B[fg];W[ef]
;B[fh];W[hs];B[ee];W[cm];B[an];W[bo];B[ao];W[aq];B[bi];W[ai]
;B[bh];W[ag];B[bk];W[ck];B[bl];W[cl];B[ak];W[aj];B[bl];W[ao]
;B[am];W[bk];B[al];W[rg];B[pd];W[pc];B[mc];W[nb];B[la];W[qg]
;B[dj];W[nc];B[eg];W[mg];B[cf];W[ne];B[nf];W[kb];B[af];W[ka]
;B[dm];W[kc];B[ci];W[pg];B[ch];W[ma];B[br];W[lf];B[bq];W[sg]
;B[as];W[kn];B[bm];W[an];B[al];W[lo];B[ak];W[li];B[bl];W[qd]
;B[am];W[bm];B[al];W[pk];B[mk];W[gb];B[fb];W[fa];B[ea];W[ga]
;B[gc];W[ha];B[eb];W[fr];B[er];W[fs];B[es];W[gs];B[gd];W[gq]
;B[fp];W[gj];B[fi];W[hd];B[ak];W[mh];B[bl];W[am];B[al];W[nh]
;B[ak];W[kd];B[qs];W[md];B[qr];W[km];B[ss];W[kl];B[sp];W[kk]
;B[sq]
C[As in the Main Path, Black again gets the White stones in the \
lower right corner.

B +2
=====]
)
(;W[if]
C[White tries to get a Ko.]
;B[hh];W[gh];B[qs];W[ih];B[qf];W[rf];B[hh];W[pk]
C[But she has only one internal Ko-treat, what is not enough.]

;B[mk];W[ih];B[pg];W[rg];B[hh];W[ne];B[sq];W[op];B[qr];W[ih]
;B[or];W[oq];B[hh]
C[White has no adequate Ko-Threat left, so Black will give Atari \
in the corner next and win the Ko, whereever White plays next.]
))))
(;B[rs]
C[Black cannot play in the corner at the 2-1-point.]
;W[np]
C[The simplest way for White is to play on the point spurn by Black \
by herself and connect one of her stones.]
;B[sr];W[ss];B[sr]
C[Even if Black plays this stone at 28 or 29, he would nothing \
change in the final result here.]
;W[oq]
C[It is not necessary for White to play in the corner, as Black \
is signed by great approaching difficulties there. She takes \
outside liberties instead.]
;B[sq];W[nq];B[qs]
C[The resulting Seki in this corner does not really help Black.

W +R
=====]
))
(;B[np]
C[Here we will explain why it is so important to exchange the moves \
Black 21 and White 22 in the Main Path.]
TR[rj][qi]
;W[rs];B[sr];W[oq];B[mq];W[lr];B[lq];W[kr];B[kq]
;W[jp];B[jq];W[jr];B[iq];W[hq];B[gr];W[hr];B[ip];W[jo];B[io]
;W[ho];B[in];W[hn];B[im];W[hl];B[ik];W[hk];B[ij];W[hj];B[ii]
;W[ih];B[ji];W[kj];B[jh];W[kh];B[jg];W[jf];B[ig];W[hh];B[if]
;W[ie];B[hf];W[he];B[gf];W[ge];B[fg];W[ef];B[fh];W[hs];B[ee]
;W[cm];B[an];W[bo];B[ao];W[aq];B[bi];W[ai];B[bh];W[ag];B[bk]
;W[ck];B[bl];W[cl];B[ak];W[aj];B[bl];W[ao];B[am];W[bk];B[al]
;W[rg];B[pd];W[pc];B[mc];W[nb];B[la];W[nc];B[eg];W[mg];B[cf]
;W[ne];B[nf];W[kb];B[af];W[qg];B[dj];W[pg];B[ch];W[ka];B[ci]
;W[kc];B[br];W[ma];B[dm];W[sg];B[bq];W[lf];B[as];W[kn];B[bm]
;W[an];B[al];W[lo];B[ak];W[li];B[bl];W[qd];B[am];W[bm];B[al]
;W[rj]
C[Without this exchange White will be able to play at 130 (here) \
herself, ...]
;B[qi]
C[forcing Black to add a stone at 131.]
;W[pk];B[mk];W[gb];B[fb];W[fa];B[ea];W[ga];B[gc]
;W[ha];B[eb];W[fr];B[er];W[fs];B[es];W[gs];B[gd];W[gq];B[fp]
;W[gj];B[fi];W[hd];B[nq];W[oq];B[ak];W[mh];B[bl];W[am];B[al]
;W[kd];B[ak];W[md];B[qr];W[km];B[qs];W[ss];B[sq];W[kl];B[sp]
;W[kk];B[sr];W[nh]
C[That Black stone at 131 (the point marked with a triangle here) \
provides White with two additional points.

B +1
=====

Three minus two gives one, what would just be sufficient to win \
the game by the smallest possible margin.]
TR[qi]
))
(;B[nk]
C[Throwing in for the second time is said to be not a good idea.

The various sources agree that Black must not throw in a second \
time with his move 19, as this would cost him a liberty urgently \
needed in the late future.

In my opinion, all countable variations after that second Black \
Throw-in end 1 or 2 points better for Black than without. So \
it remains mysterious why this move should be forbidden.

Update 2009:
This move is a loss of one point for Black, if the Seki in the \
lower right remains stable until the end of the game.]
;W[mk];B[mj]
C[Black has to prevent a White eye, thus filling in a very impotant \
liberty (which in the current opinion would be necessary in a \
Semeai later on).]
;W[nk]
C[But Black remains Sente, because White has to connect at 22.

Unlike the Main Path there result two consequences now:

1. The marked White stone has been added on the board. Not only \
the Black group above, but also the White group below have lost \
one of their liberties. 

2. A White move on the triangled point is not Sente anymore. \
A White move here forces Black in the Main Path to take himself \
a liberty by his own.

In the sources available to me there are no sequences found to \
proof the statement mentioned above. So I have tried to find \
an answer by myself. You will find the results explained below.

Update 2009:
The second Throw-in is a loss of one point for Black, if the \
Seki in the lower right remains stable until the end of the game.]
TR[mk][pk]
;B[rj];W[qi];B[np]
(;W[rs]
C[One road to Semeai starts with this move at the other 2-1-point \
of the bottom right corner.

[ see variation \]]
;B[sr];W[oq];B[mq];W[lr];B[lq];W[kr];B[kq];W[jp]
;B[jq];W[jr];B[iq];W[hq];B[gr];W[hr];B[ip];W[jo];B[io];W[ho]
;B[in];W[hn];B[im];W[hl];B[ik];W[hk];B[ij];W[hj];B[ii];W[ih]
;B[ji];W[kj];B[jh];W[kh];B[jg];W[jf];B[ig];W[hh];B[if];W[ie]
;B[hf];W[he]
(;B[gf]
C[For an idea of mine ...

[see variation\]

It might be better for your understanding to first follow the \
Main Variation here and then go through the variation for Black \
93 there before returning to this point.]
;W[ge];B[fg];W[ef];B[fh]
(;W[hs]
C[White may try starting a Semeai in the upper right instead.

[see variation \]]
;B[ee];W[cm]
(;B[an]
C[Harry had the idea to wait with the "bad shape" move in the top \
right until now.

[ see variation \]]
;W[bo];B[ao];W[aq];B[bi];W[ai];B[bh];W[ag];B[bk]
;W[ck];B[bl];W[cl];B[ak];W[aj];B[bl];W[ao];B[am]
(;W[bk]
C[Above all, White could end all the discussion about that Black \
"bad-shape"-move with 93 by changing the order of moves.

[see variation\]]

(;B[al]
C[Perhaps Black can leave the scope of action  with a move on the \
right ?

[ see variation \]]
;W[rg];B[pd];W[pc]
(;B[mc]
C[The upper right corner seems to remain as the only place on the \
board where White could lose some additional points of territory. \
So what about a move on 98 instead ? 

[ see variation \]]
;W[nb];B[la];W[qg];B[dj];W[nc];B[eg];W[mg];B[cf]
;W[ne];B[nf];W[kb];B[af];W[ka];B[dm];W[kc];B[ci];W[pg];B[ch]
;W[ma];B[br];W[lf];B[bq];W[sg];B[as];W[kn];B[bm];W[an];B[al]
;W[lo]
(;B[ak]
C[It is not possible for Black to interrupt the sequence on the \
left side and to play (for example) this move in the lower right \
corner, hoping (mistakenly) for an additional 1-point advantage.

[ see variation \]]
;W[li];B[bl];W[qd];B[am];W[bm];B[al]
(;W[nq]
C[White may follow the "correct" solution in the Weiqi FaYangLun \
with an Atari in the upper left.

[see variation \]]
;B[mq]
(;W[oq]
C[Continuing the Semeai in the upper right is not correct.

[ see variation \]]
;B[pm];W[nm];B[qr];W[nq];B[qs];W[ss];B[sq];W[lq]
;B[sp];W[fb];B[eb];W[gb];B[gc];W[ec];B[fa];W[ha];B[dc];W[fr]
;B[er];W[fs];B[es];W[gs];B[gd];W[hd];B[ed];W[gq];B[fp];W[gj]
;B[fi];W[mh];B[sr];W[kd];B[sj];W[md];B[pk]
C[Black has captured one additional White stone on the marked point, \
what more than compensates for the loss of that one Black stone \
for the second Throw-in.

W +1
=====

So Black was able to narrow the gap a little bit.]
TR[mk]
)
(;W[mh]
C[Continuing the Semeai in the upper right is not correct.

In the Main Path variation for White 134 (is 136 here), White \
continues to occupy liberties of the Black group in the upper \
right and nevertheless is one step too late.]
;B[qr];W[nh];B[qs];W[ss];B[sq];W[kd];B[sp];W[md]
;B[sr];W[km];B[pm];W[nm];B[pk];W[kk];B[sj]
C[What remains true here again, because Black takes the White stones \
off the board with this move.]
;W[fb]
C[White now starts the Endgame on the left side (and will lose \
as before).]
;B[eb];W[gb]
;B[gc];W[ec];B[fa];W[ha];B[dc];W[fr];B[er];W[fs];B[es];W[gs]
;B[gd];W[hd];B[ed];W[gq];B[fp];W[gj];B[fi];W[lq];B[nq]
C[B +3
====]
))
(;W[gb]
C[White follows Weiqi FaYangLun here.

In the sequence that is shown as correct solution in the Weiqi \
FaYangLun Black gets the White lower right corner, White captures \
the Black upper right group and nevertheless loses the game. \
As you will see, this outcome does not chance here.]
;B[fb];W[fa];B[ea];W[ga];B[gc];W[ha];B[eb];W[fr]
;B[er];W[fs];B[es];W[gs];B[gd];W[gq];B[fp];W[gj];B[fi];W[hd]
;B[nq];W[oq];B[ak];W[mh];B[bl];W[am];B[al];W[kd];B[ak];W[md]
;B[qr];W[km];B[pm];W[nm];B[qs];W[ss];B[sq];W[kl];B[sp];W[kk]
;B[sr];W[nh]
C[B +5
=====]
))
(;B[qr]
C[At any moment (except for such Eye stealing moves like 125 before) \
after having completed the four-stone-formation inside White's \
Eye on the left side (with 93), Black (mistakenly) could have \
the idea to play at the 3-2-point of the lower right corner.

That is because in every variation analysed so far Black would \
play at this point after White captured the twenty Black stones \
in the centre.]
;W[qd]
C[White follows the Main Path for the time being. 

She cannot answer inside the Seki in the lower right, as this \
would make it possible for Black to resolve it (not shown here).

Capturing the twenty Black centre stones at this moment loses \
the game, too (not shown here).]
;B[pm];W[nm];B[ak];W[li];B[bl];W[mh];B[am]
;W[bm];B[al]
(;W[md]
C[White simply continues to take Black liberties in the upper right. \
Capturing the Black stones in the centre (as "usual") would be \
not correct here.

[ see variation \]]

(;B[ak]
C[Black cannot capture the three White stones, because his earlier \
played marked stone took his centre group a liberty.

[ see variation \]]
TR[qr]
;W[nq]
C[Now it is the right moment to capture the Black centre group.]
;B[mq];W[kd]
C[White does not make the Placement now, but continues to occupy \
liberties of the Black group in the upper right.]
;B[qs];W[ss];B[sq];W[nh];B[sp]
;W[kk];B[sr];W[kl];B[pk];W[km]
C[Black is that one move too late, he had lost in the beginning \
by playing in the lower right instead of continuing the "usual" \
sequence on the left side.

W +R
=====]
)
(;B[nq]
C[In contrast to what is known as "correct" sequence in the Weiqi \
FaYangLun, it is not correct to capture the three White stones.]
;W[oq];B[ak];W[op]
C[The key move, taking an inner liberty first.]
;B[bl];W[am];B[al];W[ss];B[ak]
;W[sq]
C[Black is one move too late. White lives in the corner, gets the \
whole right side and wins with ease.

If Black plays 147 (= B here) at 148, White answers at A and \
captures a third Black group.

W +R
=====]
LB[ak:B][qs:A]
))
(;W[nq]
C[Capturing the twenty Black centre stones is a little bit too \
early.]
;B[mq];W[fb]
C[It is best for White to start with the Tsuke of Yamada Shinji \
in the upper right. 

This time she does not make the Placement inside the four stones \
Black captured with 139, but keeps it in reserve. Because Black \
already has the marked stone (= 127) in place, a White placement \
would be Gote.]
TR[qr]
;B[eb];W[gb];B[gc];W[ec];B[fa];W[ha]
;B[dc];W[fr];B[er];W[fs];B[es];W[gs];B[gd];W[hd];B[ed];W[gq]
;B[fp];W[gj]
(;B[qs]
C[Black must be careful here. It is not correct to follow the known \
path of the "usual" Endgame on the left side.

[ see variation \]]
;W[ss];B[sq];W[fi];B[ej];W[lq];B[nq];W[kk];B[sp]
;W[kl];B[sr];W[km];B[pk];W[nh];B[sj]
C[White's mistake had cost her the game, but Black will not win \
either. A 1-point advantage compared to the main variation after \
the second Throw-in is not enough to turn the tables.

JIGO.
=====]
)
(;B[fi]
C[It is a mistake to follow the known path here. This move saves \
only three points of territory, ...]
;W[oq]
C[... but White gets the well known 4-point advantage through this \
Placement in the lower right.]
;B[qs];W[ss];B[sq];W[nq];B[sp];W[lq];B[sr]
;W[kk];B[pk];W[kl];B[sj]
C[W +1
=====]
))))
(;B[nb]
C[This Hasami-Tsuke seems to be an obvious alternative at this \
moment to reduce the White upper right corner. In my opinion \
there must be a reason why it is not mentioned in the published \
sources. Joachim Meinhardt was so kind to help me with the following \
sequences and the commentary.]
;W[mc];B[ma];W[ob]
C[Prevents further Black actions in this area.]
;B[la];W[qg];B[dj];W[mg];B[eg]
;W[kb];B[cf];W[ka];B[af];W[kc];B[ci];W[pg];B[ch];W[lf];B[dm]
;W[sg];B[br];W[kn];B[bq];W[lo];B[as];W[li];B[bm];W[an];B[al]
;W[ne];B[nf];W[nc]
C[White must force Black to answer the question "To connect or \
not to connect ?" before she takes the chain of Black stones \
in the centre off the board. Otherwise she will give opportunities \
to Black to turn the tables (not shown here).]

(;B[ak]
C[It is not possible for Black to connect his stone in Atari with \
a move at 130.

[ see variation \]]
;W[na];B[bl]
C[The following sequence is equivalent to that of the Main Path.]
;W[qd];B[am];W[bm];B[al];W[nq];B[mq]
;W[oq];B[pm];W[nm];B[qr];W[nq];B[qs];W[ss];B[sq];W[lq];B[sp]
;W[fb];B[eb];W[gb];B[gc];W[ec];B[fa];W[ha];B[dc];W[fr];B[er]
;W[fs];B[es];W[gs];B[gd];W[hd];B[ed];W[gq];B[fp];W[gj];B[fi]
;W[mh];B[sr];W[km];B[pk];W[kl];B[sj]
C[All Black efforts in the top right corner had no effect on the \
final result. As before, White has seven points in the marked \
area, including the captured Black stone.

W +1
=====]
TR[nb][oc][pb][qb][pa][oa]
)
(;B[na]
C[Black connects his endangered stone in the top right.

White would lose four points, what would be sufficient for Black \
to turn the tables. But remember that the Black group has to \
survive this manoeuvre, despite Black has lost a move here.]
TR[nb][oc][oa]
;W[oa];B[ak];W[qd];B[bl];W[mh];B[am];W[bm];B[al]
;W[nq];B[mq];W[kd];B[qr];W[kk];B[qs];W[ss];B[sq];W[nh];B[sp]
;W[kl];B[sr];W[km];B[pm];W[md]
C[Because Black has lost a move in the beginning, he is one move \
too late in the end. 

W +R
=====]
)))
(;B[rg]
C[This move got in my mind during discussions with Joachim Meinhardt. \
Black denies White from getting three points of territory here \
without hurting the number of liberties of his group.]
TR[qf][rf][sf]

(;W[rf]
C[Capturing the Ko on the left side (with 94, 96 or 98) could result \
in a "life-life" situation, where both the White group on the \
left and the Black group in the upper right live.

[ see variation \]]
;B[pd];W[pc];B[mc];W[nb];B[al]
C[Black connects on the left, because playing at A would be Gote.]
LB[la:A]
;W[la]
C[Now the question arises, if White will be able to keep the two \
marked points as territory, reducing the advantage of the Black \
move at 93 to one point. To allow Black to play at this point \
would result in a 2-point loss for White.]
;B[ka]
C[But as a matter of course Black wants more.]

(;W[nc]
C[Blocking solidly at 102 seems best for White. Other options would \
be cutting at A or connecting at B.

[see variations\]]
LB[kb:A][ma:B]
;B[ma];W[kb];B[eg];W[na];B[dj];W[mg];B[dm];W[ne]
;B[nf];W[qd];B[cf];W[kc];B[af];W[lf];B[ci];W[kn];B[ch];W[lo]
;B[br];W[li];B[bq];W[mh];B[as];W[sf];B[bm];W[an];B[al];W[la]
;B[ak];W[sg];B[bl];W[md];B[am];W[bm];B[al];W[nq];B[mq];W[oq]
C[The Black group in the upper right has seven liberties, so trying \
to start a Semeai there will be in vain.]

;B[pm];W[nm];B[qr];W[nq];B[qs];W[ss];B[sq];W[lq];B[sp];W[fb]
;B[eb];W[gb];B[gc];W[ec];B[fa];W[ha];B[dc];W[fr];B[er];W[fs]
;B[es];W[gs];B[gd];W[hd];B[ed];W[gq];B[fp];W[gj];B[fi];W[ja]
;B[sr];W[nh];B[pk];W[kk];B[sj]
C[B +1
====]
)
(;W[kb]
C[White cuts.]
;B[nc]
C[Pushing once more into the White corner seems to be sufficient \
for Black.]
;W[ob];B[dj]
C[Black cannot capture two White stones with a move at A, because \
this would cost him one of his liberties.]
LB[oc:A]
;W[mg];B[eg];W[oc];B[dm];W[ne]
;B[nf];W[qd];B[cf];W[kc];B[af];W[lf];B[ci];W[kn];B[ch];W[lo]
;B[br];W[li];B[bq];W[mh];B[as];W[sf];B[bm];W[an];B[al];W[qg]
;B[ak];W[nh];B[bl];W[kk];B[am];W[bm];B[al];W[nq];B[mq];W[oq]
;B[pm];W[nm];B[qr];W[nq];B[qs];W[ss];B[sq];W[lq];B[sp];W[fb]
;B[eb];W[gb];B[gc];W[ec];B[fa];W[ha];B[dc];W[fr];B[er];W[fs]
;B[es];W[gs];B[gd];W[hd];B[ed];W[gq];B[fp];W[ja];B[gi];W[gj]
;B[gh];W[sg];B[sr];W[kl];B[pk];W[km];B[sj]
C[B +3
====]
)
(;W[ma]
C[White connects the stone in Atari, but has very bad shape here.]
;B[nc]
C[Again, pushing once more into the White corner seems to be sufficient \
for Black.]
;W[ob];B[dj];W[kb];B[eg];W[kc];B[cf];W[mg]
;B[af];W[oc];B[dm];W[ne];B[nf];W[qd];B[ch];W[sf];B[ci];W[lf]
;B[br];W[kn];B[bq];W[lo];B[as];W[li];B[bm];W[an];B[al];W[mh]
;B[ak];W[sg];B[bl];W[nh];B[am];W[bm];B[al];W[nq];B[mq];W[oq]
;B[pm];W[nm];B[qr];W[nq];B[qs];W[ss];B[sq];W[lq];B[sp];W[fb]
;B[eb];W[gb];B[gc];W[ec];B[fa];W[ha];B[dc];W[fr];B[er];W[fs]
;B[es];W[gs];B[gd];W[hd];B[ed];W[gq];B[fp];W[gj];B[fi];W[kk]
;B[sr];W[kl];B[pk];W[km];B[sj]
C[B +2
====]
))
(;W[al]
C[Capturing the Ko on the left side could result in a "peaceful" \
variation , in which both sides live.

What we do not know with certainty is, 

1. if this Ko capture would be an option for White to win the \
game and 
2. - in addition - if White could afford not to resolve the Ko \
on the left with a second move there.

I am in fear that finding the answers will be a bit too advanced \
for someone on Amateur Kyu level.

Some results of our research are shown hereafter.]
;B[qf];W[mg];B[pg]
C[Black lives now on the right.

It is a very astonishing aspect of this problem that living with \
the group in the top right without having the Seki in the lover \
right quadrant of the board resolved does not profit Black.

Compared to the Main Path:

1. Black will not play additional 2 + 4 + 1 = 7 stones into the \
Nakade on the left, which will be captured by White.
2. White will not capture the string of 20 Black stones in the \
centre and not get 18 points of territory there (marked with \
triangles). Black will not capture 4 White stones in return and \
get 1 stone recaptured.
3. White will not capture 3 Black stones in the lower right corner. \
Black will not capture 14 White stones there (marked with squares).
4. The 17 White stones in the middle right will not be Black \
prisoners and 4 liberties of these stones will not be Black territory \
(marked with squares).
5. White will not be able to get some 5 points in the centre \
(marked with diamonds).

That results in 7 + 20 + 18 + 1 + 3 + 5 = 54 points not got by \
White and 4 + 14 + 14 + 17 + 17 + 4 = 70 points not got by Black.

So Black is approximately 25 points behind from the start here. \
The only place on the board, where Black could take compensation \
for this disadvantage, is the top left corner. It is a must for \
Black to prevent that White Endgame there.

If White would play there first, Black will not have any chance \
of winning.]
TR[gf][hf][if][ig][jg][jh][ji][ii][ij][ik][il][im][in][io][ip][iq][jq][kq][lq][mq][or][oq][op][je][kf][lh][ko]
SQ[pn][om][on][nn][mm][ml][nl][nk][mk][nj][ok][oj][pj][qj][ri][si][rl][sl][sm][sn][rn][ro][so][qo][qp][rp][rq][rr][rs][sr][sq][sp]

(;W[bm]
C[But White cannot afford to be so kind resolving the Ko, because \
Black will probably win the game, as shown hereafter.

[see variation\]]
;B[gb]
C[The biggest point on the board and Sente. This move threatens \
to reduce the White group in the centre to one eye, thus forcing \
White to capture the string of Black stones, to resolve the Seki \
in the lower right and to lose the game.]
;W[kd];B[pd];W[pc];B[mc];W[nb];B[nc];W[oc]
;B[ma];W[ob];B[qd];W[rd];B[gs];W[gq];B[fr];W[ci];B[ch];W[dj]
;B[ej];W[af];B[ae];W[cf];B[be];W[dm];B[eo];W[gc];B[gd];W[hd]
;B[fd];W[ha];B[fb];W[na];B[la];W[rf];B[sf];W[bq];B[cq];W[eh]
;B[ei];W[eg];B[kc];W[jc];B[ga];W[ia];B[se];W[sd];B[sg];W[gm]
;B[fm];W[br]
C[I apologize for the amateurish idea of the Endgame above, but \
I did not find any sequence that lost Black the game.

The Seki in the lower right will remain unresolved.

B +1
====]
)
(;W[fb]
C[So White will not resolve the Ko in the left side, but play the \
Endgame in the upper left.

This Ko is a very asymmetrical one in my opinion. Black will \
have no chance of winning it.

Black will have to find Ko threats big enough to compensate for \
that 25-points-disadvantage, while White needs only about 5 additional \
points to win the game. That is because the best Black can get \
by connecting the Ko is a return to the sequence of the Main \
Path with White capturing the Black string of stones in the centre.

W +R
=====]
))))
(;W[rg]
C[She simply plays on that point by her own with her move 92 and \
...]
;B[pd];W[pc];B[mc];W[nb];B[la];W[bk]
C[... and may return to the Atari on the left with 98.

- - - - - - - - - - 

So the question arises whether it would be possible for Black \
to play that "bad-shape"-move earlier.]
))
(;B[rg];W[bo]
C[If White plays 76 at White 88 (= A), we revert to the "official \
line" except that Black has stolen several points from White. \
However, if White takes profit on the left with White 76 as in \
this diagram, then Black has to get 2 eyes at the top.]
LB[rf:A]
;B[dm];W[cl];B[qf];W[mg];B[pd];W[pc];B[nb]
;W[mc];B[ma];W[ob];B[sf];W[rf];B[pg];W[fb];B[eb];W[gb];B[gc]
;W[ec];B[fa];W[ha];B[dc];W[fr];B[er];W[fs];B[es];W[gs];B[qd]
;W[rd];B[gq];W[gp];B[fp];W[gd];B[fd];W[ch];B[ci];W[bi];B[af]
;W[ag];B[dj];W[eg];B[eh];W[gj];B[bq];W[aq];B[fi];W[kd];B[na]
;W[oa];B[la];W[oc];B[kc];W[jc];B[ja];W[br];B[cf];W[ai];B[se]
;W[sd];B[sg]
C[However, this will become extremely close for Black, our attempts \
ended with

Jigo ! 
=====

Therefore Black cannot afford to play the second Throw-in any \
more; the result without the Throw-in (marked with a triangle) \
would be a close result: Black +1. 

I am sorry, but more detailed diagrams are not available yet \
!]
TR[nk]
))
(;W[rg]
C[White now starts reducing the liberties of the Black group in \
the upper right without securing her group on the lower side \
before.]
;B[ks]
C[The Semeai follows a well known path.]
;W[mc];B[pd];W[pc];B[la];W[mg];B[hs];W[ne]
;B[nf];W[kb];B[gq];W[qg];B[gp];W[pg];B[go];W[sg];B[gn];W[ma]
;B[gm];W[ka];B[gl];W[kc];B[gk];W[md];B[gj];W[lf];B[gi];W[kd]
;B[nq];W[oq];B[gh];W[qd];B[is];W[nh];B[js];W[mh];B[qr];W[li]
;B[qs];W[ss];B[sq];W[kk];B[sp];W[kl];B[sr];W[km];B[pm];W[nm]
;B[pk];W[kn];B[sj]
C[Black captures the White stones on the right side. White is one \
move too late. 

B +R
=====]
))
(;B[rg]
C[This seems to be the last possible moment to play that "bad shape"-move \
in the upper right before action starts on the left side of the \
board.

White now has several options:

White M immediately makes it impossible for Black to make two \
Eyes in the top right. Black must therefore force White to capture \
the 20 stones in the centre so as to break the (temporary) Hanezeki.

White L first presses the black stones on the left.

In the top left corner White F seems to be strongest.

Our first idea in the top left was H, but this doesn't seem to \
work for White.]
LB[cm:L][rf:M][gd:I][ge:H][gf:G][ee:F][fd:E][ed:D][eb:C][fb:B][gb:A]

(;W[cm]
C[White starts the "usual" sequence on the left side, because answering \
immediately in the top right will lose White the game, as we \
have seen already (please refer to the variation for B 93).

Update 2009:
To start attacking the black stones on the left with 68 is alternative \
"L" of the research on my "bad-shape" move.

In the meantime we found that a white answer in the top left \
corner would probably be much stronger.

[ see variation \]]
;B[an];W[bo];B[ao];W[aq]
(;B[qf]
C[Black now takes the opportunity to live in the top right.

Black will not be successful if he returns to the Main Path here.

Saving the stones on the left may look big, but will lose the \
game for Black, too.

[see variations\]]
;W[mg];B[pg]
(;W[bk]
C[White captures the Black group.

But it would be better to start the Endgame in the top left at \
A instead.

 [see variation \]

Yamada Shinji's Tsuke at B is not possible here, because the \
surroundings are far more open than in the Main Path.

[ see variation \]]
LB[fb:B][gb:A]
;B[ge]
C[Black answers in the top left, getting points ...]
;W[gf];B[gb]
C[... while threatening the second eye of the White centre group.]
;W[kd];B[pd]
C[What follows is an amateurish idea of the Endgame. Black seems \
to be about five points ahead.]
;W[pc];B[qd];W[rd]
;B[mc]
C[Update 2009:
A Hasami-Tsuke at 86 will give Black an advantage of one point.]
;W[nb];B[nc];W[oc];B[ma];W[ob];B[dm];W[cl];B[bq];W[ai]
;B[br];W[bl];B[dj];W[hs];B[gs];W[gq];B[fr];W[na];B[la];W[ee]
;B[ed];W[ef];B[gc];W[gd];B[fd];W[hd];B[af];W[kc];B[cc];W[ha]
;B[ga];W[ia];B[ci];W[bi];B[ch];W[bh];B[rf];W[sf];B[fh];W[eh]
;B[ei];W[eg]
C[B +6
====

Black may perhaps be 1 point better if he does not play the second \
Throw-in with B 19. The Seki in the lower right is not resolved, \
so this proves as a lost move now.]
)
(;W[gb]
C[White starts the endgame in the upper left ...]
;B[fb];W[fa];B[ea];W[ga];B[gc];W[ha];B[eb];W[bk]
C[... before returning to the Black group on the left with 84.]

;B[pd]
C[The moves from here on follow the suggestion of Yoon Young-Sun \
5p from Korea, now living in Hamburg, Germany. Special thanks \
to Yoon Sensei, who was so kind to help me with the correct Endgame \
here.]

(;W[pc]
C[It does not profit White to Tenuki with this move to play in \
the centre.
(see variation)]
;B[qd]
(;W[rd]
C[It does not profit White to Tenuki with this move to play in \
the centre.
(see variation)]
;B[mc]
C[Update 2009:
A Hasami-Tsuke at 90 might be possible and give Black a further \
advantage of one point.]

(;W[nb]
C[It does not profit White to Tenuki with this move to play in \
the centre.
(see variation)]
;B[nc]
(;W[oc]
C[It does not profit White to Tenuki with this move to play in \
the centre.
(see variation)]
;B[ma]
(;W[oa]
C[It does not profit White to Tenuki with this move to play in \
the centre.
(see variation)]
;B[ge];W[gf];B[dm];W[cl];B[br];W[ai];B[bq];W[bl]
;B[fh]
C[The biggest point remaining on the board.]
;W[hs]
C[Sente. The follow-up move at A would be unbearable for Black.]
LB[fr:A]
;B[gs];W[gq];B[fr];W[af];B[ae];W[cf];B[be];W[dj]
;B[ej];W[ee]
C[It is the correct order of moves to start here ...]
;B[ed];W[gd]
C[... before this move.]
;B[fd];W[hd];B[kd]
C[Hereafter only 1-point Endgames are available.]
;W[gj]
(;B[ef]
C[It would be a mistake to follow the Main Path instead. The captured \
White stone compensates for the point Black has lost below.
(see variation)]
;W[eg];B[ci];W[sf];B[rf];W[jc];B[la];W[na];B[ja]
;W[ag]
C[No Ko fight will start here, because two Ko of different colours \
are open.]
;B[ee]
C[B +1
=====

Black may perhaps be 1 point better if he does not play the second \
Throw-in with B 19. The Seki in the lower right is not resolved, \
so this proves as a lost move now.]
)
(;B[fi]
C[Black follows the Main Path.]
;W[ef]
C[White connects. This move endangers one point of Black territory \
as well, but leaves no open Ko behind.]
;B[eh];W[jc];B[ci];W[sf];B[rf];W[na]
C[Sente. And takes one Black Ko threat away, what will be very \
important later.]
;B[la]
;W[ja];B[ag]
C[Black captures a White stone, but will be unable to win the following \
Ko fight.]
;W[cc];B[bc];W[af];B[se];W[sd];B[ag];W[bb];B[dd]
;W[af];B[sg];W[se];B[ag];W[ac];B[cb];W[af];B[rc];W[sc];B[ag]
;W[li];B[mh];W[af];B[ob];W[pb];B[ag];W[kn];B[lo];W[af];B[ao]
;W[an];B[ag];W[ne];B[nf];W[af];B[lf];W[kf];B[ag];W[gp];B[fp]
;W[af];B[as];W[ao];B[ag];W[db];B[ca];W[af];B[sb];W[sa];B[ag]
;W[ba];B[da];W[af];B[pm];W[nm];B[ag];W[bi];B[ch];W[af];B[tt]
C[Black passes. There is no Ko threat anywhere.]

;W[ag]
C[Jigo !
=====

Black may perhaps be 1 point better if he does not play the second \
Throw-in with B 19. The Seki in the lower right is not resolved, \
so this proves as a lost move now.

Update 2009:
Black might be a further 1 point better if he had played Hasami-Tsuke \
in the top right corner with 89.]
))
(;W[fh];B[ob]
C[For the third time there is a Black Endgame in the top right \
corner with a value of 8 points. So the result remains unchanged.]
;W[pb];B[na];W[dm];B[dj];W[do];B[dp]))
(;W[fh];B[ob]
C[Again, the Black Endgame in the top right corner has a value \
of 8 points. So the result remains unchanged.]
;W[dm];B[dj];W[oc];B[pb];W[do];B[dp]))
(;W[fh];B[ob]
C[This Black Endgame in the top right corner has a value of 8 points, \
too. So the result remains unchanged.]
;W[oc];B[pb];W[nb];B[nc];W[dm];B[dj];W[do]
;B[dp]))
(;W[fh];B[rd]
C[This Endgame in the top right corner is worth about 12 points \
for Black. So White is 4 points worse.]
))
(;W[fh]
C[If White plays in the centre, she has this 8-point Endgame, according \
to Yoon Sensei.]
;B[ob]
C[But Black gets much more profit in the upper right corner.]

(;W[dm]
C[White is unable to capture some Black stones in the centre instead.
(see variation)]
;B[dj];W[do];B[dp])
(;W[ei];B[dj];W[ej];B[cl]
C[White cannot connect.]
)))
(;W[fb]
C[Yamada Shinji's Tsuke is not possible here.]
;B[ge]
C[This Black answer threatens to connect the string of black stones \
to the outside and is absolute Sente.]
;W[gf];B[gb];W[eb];B[gc];W[ec]
C[Is no threat any more against the right part of Black's stones, \
so Black can answer with 83 in the corner.

Should White play at A instead (what she did in the Seki-sequence), \
she will lose the Semeai by at least one move. White has lost \
the Sente move of B (77 had been white, not black - is marked \
with a triangle), which forced Black to take himself one liberty \
by connecting at C in the Seki-sequence.]
LB[fd:C][gd:B][bb:A]
TR[ge]
;B[cb]
C[Black wins.]
))
(;B[gf]
C[Black follows the Main Path.]
;W[ge];B[fg];W[ef];B[fh];W[hs];B[ee]
C[Now it is clear that Black has lost one move on the right side.]
;W[bk];B[qf]
C[Black is forced to make two eyes for his upper right group because \
White lives on the left side.]

;W[mg];B[pg];W[fb]
C[What follows is an amateurish idea for the Endgame again.]
;B[eb];W[gb];B[gc];W[ec];B[fa];W[ha];B[dc]
;W[fr];B[er];W[fs];B[es];W[gs];B[pd];W[pc];B[qd];W[rd];B[mc]
;W[nb];B[nc];W[oc];B[ma];W[ob];B[gq];W[gp];B[fp];W[fd];B[ed]
;W[gd];B[dm];W[cl];B[br];W[ai];B[bq];W[bl];B[kb];W[kd];B[kc]
;W[jc];B[dj];W[na];B[la];W[ec];B[fc];W[ci];B[ch];W[bh];B[af]
;W[sf];B[rf];W[eg];B[eh];W[gj];B[fi];W[ja]
C[W +5
=====

Black may perhaps be 1 point better if he does not play the second \
Throw-in with B 19. The Seki in the lower right is not resolved, \
so this proves as a lost move now.]
)
(;B[bq]
C[Black saves his stones on the left side.]
;W[rf]
C[White deprives Black of two eyes on the right side.]
;B[gf]
C[So Black has to return to the Main Path again.]
;W[ge];B[fg];W[ef];B[fh];W[hs];B[ch]
C[Necessary to prevent two eyes for White's left side group.]

;W[ee]
C[White can enter Black's weak top left corner now.]
;B[fd]
C[Black cannot give up his stone in Atari.]
;W[ed];B[ec];W[dd];B[cb];W[cc];B[bb];W[bc];B[ac]
;W[db];B[dc];W[af];B[ad];W[be];B[ae];W[ab]
C[White starts a Double Ko that Black cannot win.]
;B[ag];W[ba];B[aa]
;W[af];B[ca]
C[Sooner or later Black has to capture that White stone in the \
corner.]
;W[ag];B[ab];W[cf];B[eb];W[be]
C[White lives in the top left and therefore wins the game by a \
large margin.

w +R
=====]
))
(;W[ge]
C[This White 68 (= H as White follow-up move after Black 67) was \
the move that looked the most straightforward to us. This move \
does not leave any threat in the centre for Black, so he must \
make two eyes for his group in the upper right.

Update 2009:
In the meantime we found, that playing F with 68 might be preferable \
for White.]
LB[ee:F]
;B[qf];W[mg];B[pg]
C[Moves that now come into mind for White 72 are:

A - "Standard" Osae of the Main Path.
Seems to be too direct and too small.

B - Yamada Shinji's Tsuke. 

C - Oki. 
May perhaps run into B with a change in the order of moves.

D - Peep. 
Looks like the most interesting alternative for White. And seems \
to be the vital point in this position.

E - Atari from the right. 
Seems to be too direct and too small.

F - Atari from below. 
Will run into E with a change in the order of moves.

We did not find any sequence for White that damages the black \
corner as much as would be necessary to change the tables. Black \
will win the game.

Surprisingly the strongest move for White seems to be that one \
on the right side, preventing the black eye there immediately \
and then following the known Main Path (resulting in a 1-point \
win for Black respectively 2-points-win without the second Throw-in).]
LB[ee:F][fd:E][ed:D][eb:C][fb:B][gb:A]

(;W[gb];B[fb];W[fa];B[ea];W[ga];B[gc];W[ha];B[ec]
C[Black will keep about 15 points in the corner.
White will get some additional points in the centre.
The two black stones in the left centre cannot be cut by White.
Black gets about 10 points in this area and therefore will win \
the game.]
TR[cb][ad][bc][ac][ab][aa][bb][ba][ca][da][eb][db][dc][cd]
SQ[gh][fg][eg][hd]
)
(;W[fb]
(;B[eb]
C[Pulling back with this move is possible for Black, too, and might \
be the "safer" variation.

[ see variation \]]

(;W[ed]
C[White cannot cut.

[ see variation \]]
;B[dd];W[ec];B[db];W[fd];B[ee]
C[Black will keep about 12 points in the corner.
White will get about 7 additional points.
The two black stones in the left centre cannot be cut by White.
Black gets about 5 points in this area and therefore will win \
the game.]
TR[aa][ba][ca][da][cb][ab][bb][cd][bc][ac][ad]
SQ[ha][ga][gb][hd][gd][fc]
)
(;W[ec];B[ed];W[dc];B[gb];W[db];B[fa];W[bc];B[cb];W[ad]
;B[be];W[ca];B[bb];W[ba];B[ab];W[cc];B[ea]
C[Black wins the Semeai in the corner.]
))
(;B[ec];W[eb];B[db];W[gb];B[cc]
C[Black will keep about 12 points in the corner.
White will get about 7 additional points.
The two black stones in the left centre cannot be cut by White.
Black gets about 5 points in this area and therefore will win \
the game.]
TR[ac][aa][ab][cb][ca][ba][bb][bc][dc][cd][ad]
SQ[gh][fg][eg][hd][ha][ga][fa]
))
(;W[eb]
(;B[ec]
C[If Black plays at 73 and let White connect to the outside with \
A (White 74 at B is not possible), it will result a change in \
the order of moves with a variation shown before.

Blocking at A might be a bit dangerous for Black.

[ see variation \]]
LB[db:B][fb:A]
;W[fb];B[db];W[gb];B[cc]
C[The two black stones in the left centre cannot be cut by White.
Black gets about 5 points in this area and therefore will win \
the game.]
TR[aa][ba][ca][cb][bb][bc][ab][ac][dc][cd][ad]
SQ[gh][fg][eg][hd][ha][ga][fa]
)
(;B[fb];W[ed];B[ec];W[dd];B[ee]
C[Black plays 77 from the lower side (and not at 78) to prevent \
weakening his two centre stones.]
;W[fd];B[cc];W[dc];B[db]
;W[gd];B[bb]
C[Black will keep about 11 points in the corner.
White will get about a few additional points.
The two black stones in the left centre cannot be cut by White.
Black gets about 10 points in this area and therefore will win \
the game.]
TR[eb][da][ca][cb][ba][aa][ab][ac][ad][bc]
SQ[hd]
))
(;W[ed]
(;B[ec]
C[It seems to be best for Black to play a purely defensive move \
with 73.

[ see variation \]]
;W[dd]
C[White has the option to play at 74 at the outside immediately.

[ see variation \]]
;B[ee];W[fd];B[cc];W[dc];B[db];W[gd];B[bb]
;W[gb];B[fb]
C[Black will keep about 9 points in the corner.
Perhaps White will not play at 82 at once.
White will get about a few additional points.
The two black stones in the left centre cannot be cut by White.
Black gets more than about 5 points in this area and therefore \
will win the game.]
TR[ab][aa][ba][da][ca][cb][bc][ac][ad]
SQ[hd]
)
(;B[fd]
C[If Black connects on the right, ...]

(;W[ee]
C[... White has the option to play at 74 at the outside immediately.

If White plays inside with 74, ...

[ see variation \]]
;B[ec];W[dd];B[cc];W[dc];B[db];W[ef];B[bb];W[gb]
;B[fb]
C[Black will keep about 9 points in the corner.
White will get 8 points later by separating the two black stones \
on the left (due to the connection with 80).
But even this one remaining point in this area will Black enable \
to win the game.]
TR[da][eb][cb][ca][ba][aa][ab][ac][bc][ad]
SQ[bh][bi][ci][ch][dh][di]
)
(;W[ec]
(;B[eb]
C[... it might be dangerous for Black to shut White in with 78.

[ see variation \]

The safety-first measure for Black is to give way with 75 here.]
;W[db];B[fb]
(;W[ee]
C[Perhaps White will play inside with this move.

[ see variation \]]
;B[dc];W[dd];B[cc];W[ef];B[cb]
C[Black will keep about 10 points in the corner.
White will get 8 points later by separating the two black stones \
on the left (due to the connection with 82).
But some remaining points in this area will Black enable to win \
the game.]
TR[ea][db][ca][ba][aa][bb][ab][ac][bc]
SQ[dh][di][ci][ch][bh][bi]
)
(;W[dc]
C[Perhaps White will connect here.]
;B[ee];W[bc];B[cb];W[ad];B[be];W[ca];B[bb];W[ab]
;B[ba];W[da];B[ae];W[gc];B[dd];W[cc];B[ea];W[aa];B[bb];W[gb]
;B[ac]
C[Black has 5 outside liberties left - and White cannot take two \
of them direct. So it cannot be said that the approach-move Ko \
around 97 is really a Ko for White.]
))
(;B[ee]
C[At first sight, connecting for the second time on the outside \
with 75 looks to be extremely dangerous for Black.

But it results a change in the order of moves to something we \
have already seen before.]
;W[fb];B[gb];W[eb];B[gc];W[bb];B[bc];W[cc];B[ab]
;W[cb];B[dd];W[ac];B[dc];W[db];B[ad];W[ba];B[be];W[fa];B[da]
;W[af];B[ga];W[gd];B[ac];W[ef];B[aa];W[cf]
C[Black has three effective liberties against White's two.]
))))
(;W[fd];B[ed];W[ee];B[ec];W[gb];B[fb]
C[White will get about additional 6 points in the centre.
The two black stones in the left centre cannot be cut by White.
Black gets about 10 points in this area and therefore will win \
the game.]
TR[aa][ab][ad][ac][bc][cb][bb][ba][ca][da][eb][db][dc][dd][cd]
SQ[gh][fg][eg][ef][fe]
)
(;W[ee]
C[Update 2009:
This move at 72 opens much better continuations for White in \
the top left corner, if the area of the top right corner is not \
played out before.]
;B[ed];W[fd];B[ec];W[gb];B[fb]
C[Black will keep about 16 points in the corner.
White will get about additional 6 points in the centre.
The two black stones in the left centre cannot be cut by White.
Black gets about 10 points in this area and therefore will win \
the game.]
TR[bc][bb][ad][ac][ab][aa][ba][ca][da][eb][db][cb][cc][dc]
SQ[gh][fg][eg][ef][fe]
))
(;W[ee]
C[White 68 = F. 

In 2009, Yoon Young-Sun 5p very kindly helps us with her professional \
knowledge (as she had done several times before).
According to her estimation, 68 is strongest for White.]
;B[qf]
C[Black must secure two Eyes on the right with 69 (because Black \
cannot now force White to capture the 20 black stones in the \
temporary Hanezeki), White can continue in the top left corner. \
Nevertheless, probably White cannot prevent a Black win in the \
end.]
;W[ed];B[dc];W[ec];B[eb];W[db];B[cb];W[cm]
(;B[an]
C[The left side is bigger than the top.

[ see variation \]]
;W[bo];B[ao];W[aq];B[dm];W[cl];B[br];W[ai];B[bq]
;W[bk];B[as];W[fb];B[da];W[mg];B[pd];W[pc];B[nb];W[mc];B[ma]
;W[ob];B[sf];W[rf];B[pg];W[gb];B[dd];W[bl];B[ap];W[fh];B[dj]
;W[hs];B[gs];W[gq];B[fr];W[se];B[gf];W[ge];B[eh];W[eg];B[fi]
;W[oa];B[na];W[fa];B[ea];W[ch];B[ci];W[bi];B[af];W[gi];B[kd]
;W[kb];B[kc];W[jc];B[ka];W[ja];B[la];W[oc];B[qd];W[rd];B[sg]
C[B + 4
=====

I am sorry, but more detailed diagrams are not available yet \
!]
)
(;B[gb];W[bo];B[fd];W[ge];B[gf];W[kd];B[fg];W[ef];B[fh]
;W[hs];B[dm];W[cl];B[dd];W[mg];B[pd];W[pc];B[nb]
C[Harry Fearnley fount that this Hasami-Tsuke is possible now.

Black gets a further advantage of 1 point.]
LB[mc:A]
;W[mc];B[ma]
;W[ob]
C[Black is able (even if he possesses no Eyes) to connect this \
stone after a white Atari - A is a false Eye for White, and an \
extra liberty for Black.]
LB[oc:A]
;B[sf]
C[Black 97 is from Yoon Sensei and opens the chance for a Gote-Endgame \
later on with Black at B. If necessary, Black can instead exchange \
A for White B in Sente.]
LB[rd:B][qd:A]
;W[rf];B[pg];W[fr];B[er];W[fs];B[es];W[gs];B[ch]
;W[bh];B[ci];W[bi];B[bq];W[aq];B[rd];W[qd];B[se];W[rc];B[sd]
;W[af];B[ae];W[cf];B[be];W[sc];B[sg];W[gq];B[fp];W[dj];B[ej]
;W[bk];B[gd];W[hd];B[ha];W[gc];B[fb];W[nc];B[na];W[oa];B[la]
;W[eh];B[ei];W[eg];B[kc];W[jc];B[gl];W[gm];B[gk];W[fm];B[fl]
;W[br];B[cs];W[ag]
C[JIGO !
======]
))))
(;W[sr]
C[White tries the variation that starts with taking the two Black \
stones in the corner.]
;B[rs];W[oq];B[nq]
C[Please remember that it is not correct to follow the Main Path \
here and to play this move one point to the left.

We will use the following sequence to show something that might \
have an effect on other sequences, too.]
;W[oq];B[mq];W[lr];B[lq];W[kr]
;B[kq];W[jp];B[jq];W[jr];B[iq];W[hq];B[gr];W[hr];B[ip];W[jo]
;B[io];W[ho];B[in];W[hn];B[im];W[hl];B[ik];W[hk];B[ij];W[hj]
;B[ii];W[ih];B[ji];W[kj];B[jh];W[kh];B[jg];W[jf];B[ig];W[hh]
C[As usual White cannot hope on a Ko with 65.]

;B[if];W[ie];B[hf];W[he];B[gf];W[ge];B[fg];W[ef];B[fh]
(;W[hs]
C[By saving her centre stones White chooses the "peaceful" variation. \
Without the second Black Throw-in she finally got the Black upper \
right group. Black in return captured the White group in the \
lower left. Let's see, what the result will be here.

For the Semeai ...

[see variation \]]
;B[ee];W[cm];B[an];W[bo];B[ao];W[aq];B[bi];W[ai]
;B[bh];W[ag];B[bk];W[ck];B[bl];W[cl];B[ak];W[aj];B[bl];W[ao]
;B[am];W[bk];B[al];W[rg];B[pd];W[pc];B[mc];W[nb];B[la];W[qg]
;B[dj];W[nc];B[eg];W[mg];B[cf];W[ne];B[nf];W[kb];B[af];W[ka]
;B[dm];W[kc];B[ci];W[pg];B[ch];W[ma];B[br];W[lf];B[bq];W[kn]
;B[as];W[sg];B[bm];W[an];B[al];W[lo];B[ak];W[li];B[bl];W[qd]
;B[am];W[bm];B[al];W[gb];B[fb];W[fa];B[ea];W[ga];B[gc];W[ha]
;B[eb];W[fr];B[er];W[fs];B[es];W[gs];B[gd];W[gq];B[fp];W[gj]
;B[fi];W[hd];B[ak];W[mh];B[bl];W[am];B[al];W[kd];B[ak];W[md]
;B[pm];W[nm];B[qs];W[nh];B[qr];W[km];B[ss];W[kl];B[sp];W[kk]
;B[sq]
C[The result is the same here in principle. Both sides captured \
the groups on the right side of the board as before. The squared \
White stone would otherwise be a Black one (= Black 135) and \
White would have played the move 134 on the triangled point, \
taking a liberty of the Black group below.

B +4
=====]
TR[pk]
SQ[mk]
)
(;W[rg]
C[White starts the Semeai in the upper right.]
;B[ks];W[mc];B[pd];W[pc];B[la];W[mg];B[hs];W[ne]
;B[nf];W[kb];B[gq];W[qg];B[gp];W[pg];B[go];W[sg];B[gn];W[ma]
;B[gm];W[ka];B[gl];W[kc];B[gk];W[md];B[gj];W[kd];B[gi];W[lf]
;B[gh];W[qd];B[is];W[li];B[js];W[mh];B[qs];W[nh];B[qr];W[kk]
;B[ss];W[kl];B[sp];W[km];B[sq];W[kn];B[pm];W[lo]
C[White is successful and wins the Semeai by one move.]
;B[ee]
C[But Black closes the upper left corner and wins the game either. \
All the White stones on the left side are dead.

It seems to me that this move had not been recognised so far. \
Even if White would be successful in the variation for White \
70 in the Main Path – without the second Throw-in with Black \
19 – in winning the Semeai in the upper right, she would lose \
the game by this move, too. 

B +R
=====]
))))
