(;GM[1]FF[4]SZ[19]
GN[A different ko: white's mistake]
PC[https://senseis.xmp.net/?BeginnerExercise110/Solution]AP[GoWiki:2009]
DT[2022-10-12]
C[Diagram from https://senseis.xmp.net/?BeginnerExercise110/Solution

A different ko: white's mistake]
PL[B]

AB[cc][cd][ce][cf][df][cj][dj][ej][fk][el][gl]
AW[db][dc][de][ee][ef][dg][dh][fh][di][fi][fj][gk][hk]
LB[bf:b][ai:a]

;B[ch]C[B1]MN[1]
;W[cg]C[W2]MN[2]
;B[bg]C[B3]MN[3]
;W[bh]C[W4]MN[4]
;B[ah]C[B5]MN[5]
;W[ci]C[W6]MN[6]
;B[bi]C[B7]MN[7]
;W[bj]C[W8]MN[8]

;LB[bf:b][ai:a]
)
