(;GM[1]FF[4]SZ[19]
GN[Black to make ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection3Problem40]AP[GoWiki:2009]
DT[2023-01-21]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection3Problem40

Black to make ko]
PL[B]

AB[da][cb][dc][gc][kc][lc][mc][dd][ed][fd][gd][jd]
AW[fa][db][eb][gb][ec][fc][ic]


;
)
