(;GM[1]FF[4]SZ[19]
GN[Black to make ko]
PC[http://senseis.xmp.net/?GokyoShumyoSection3Problem15]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection3Problem15

Black to make ko]
PL[B]

AB[bb][fb][cc][dc][ec][cd]
AW[ab][gb][bc][gc][bd][dd][fd][ce][de]


;
)
