(;GM[1]FF[4]SZ[19]
GN[Sacrificing four stones to avoid ko]
PC[http://senseis.xmp.net/?TsumegoFromGames134/Attempts]AP[GoWiki:2009]
DT[2009-06-05]
C[Diagram from http://senseis.xmp.net/?TsumegoFromGames134/Attempts

Sacrificing four stones to avoid ko]
PL[W]

AB[ea][ka][db][eb][gb][jb][lb][dc][fc][gc][hc][ic][kc][lc][kd]
AW[ca][da][cb][ib][mb][ob][cc][ec][jc][nc][dd][ed][fd][gd][hd][id][jd][ld][md][ke][le]

;W[fa]C[W1]MN[1]
;B[ia]C[B2]MN[2]
;W[fb]C[W3]MN[3]

;
)
