(;SZ[11]GC["Mathematics of Go Game" by SHIMADA Takuya, publ. 1958 by Maki Shoten. Chapt. 6, p 128, Dia. 25]AW[ab][ac][bc][cc][dc][ec][eb][ea][ha][hb][gb][ib][hc][id][jc][jd][je][ke][aj][bj][cj][dj][ej][fi][fh][eh][dh][gh][dg][de][df][ee][fe][ge][gf][hf][ig][jg][kg][hh][ih][jh][ji][ki][kj][kk][ik][hk][hj][ba]N["Mathematics of Go Game" by SHIMADA Takuya, publ. 1958 by Maki Shoten. Chapt. 6, p 128, Dia. 25]AB[bb][cb][ca][fa][ga][fb][fc][fd][gc][gd][hd][he][ie][if][jf][kf][jb][ja][kb][kc][ka][ad][bd][cd][dd][ed][ce][cf][cg][ch][ci][di][ei][bi][ai][af][be][bg][ak][bk][ck][fk][fj][gj][gi][hi][ii][ij][jj][jk]LB[aa:a]
;B[aa];W[];B[];W[]PL[B];B[da];W[ba];B[ia];W[kd];B[aa];W[dk];B[bk];W[ba];B[jb];W[ja]
;B[aa];W[ek];B[gk];W[ba];B[kb];W[db];B[ak];W[ia];B[ck];W[bb];B[ej];W[];B[bj])