(;GM[1]FF[4]SZ[7:19]
GN[Ko? (If W12 fills, B12 kills)]
PC[http://senseis.xmp.net/?KyuExercise107/Solution]AP[GoWiki:2009]
DT[2012-12-14]
C[Diagram from http://senseis.xmp.net/?KyuExercise107/Solution

Ko? (If W12 fills, B12 kills)]
PL[W]

AB[ca][bb][db][cc][ec][fc][fd][fe][bf][ff][bg][cg][eg][fg][ah][ch][dh][gh][bi][gi][cj][gj][ck][gk][cl][fl][em][dn][fn][co][do][eo][dp]
AW[dc][bd][cd][dd][ed][be][de][ge][af][cf][df][dg][eh][ci][di][fi][bj][dj][fj][bk][fk][bl][dl][el][dm][bn][cn][bo]

;W[ej]C[W10]MN[10]
;B[fh]C[B11]MN[11]
;W[dk]C[W12]MN[12]

;
)
