(;GM[1]FF[4]SZ[19]
GN[Black to make ko]
PC[http://senseis.xmp.net/?GokyoShumyoSection3Problem23]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection3Problem23

Black to make ko]
PL[B]

AB[da][db][gb][dc][ed][fd][gd]
AW[cb][hb][cc][hc][cd][hd][de][ee][ge][he]


;
)
