(;GM[1]FF[4]SZ[19]
GN[black can't avoid ko]
PC[http://senseis.xmp.net/?KyuExercise45/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?KyuExercise45/Attempts

black can't avoid ko]
PL[W]

AB[bb][cb][ib][bc][dc][ec][ic][bd][hd][id][be][de][cf][ef][gf][if][cg][gg][ch][dh][eh][fh]
AW[hb][kb][cc][fc][hc][cd][dd][ed][fd][gd][df][dg][eg]
CR[kb][de]
LB[ea:a][db:b]

;W[ia]C[W1]MN[1]
;B[ja]C[B2]MN[2]
;W[ga]C[W3]MN[3]
;B[jb]C[B4]MN[4]
;W[eb]C[W5]MN[5]
;B[gb]C[B6]MN[6]
;W[fb]C[W7]MN[7]

;CR[kb][de]
LB[ea:a][db:b]
)
