(;GM[1]FF[4]SZ[19]
GN[Black to make ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection3Problem7/Solution]AP[GoWiki:2009]
DT[2023-01-01]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection3Problem7/Solution

Black to make ko]
PL[B]

AB[eb][bc][cc][dc]
AW[fb][ec][gc][bd][cd][dd][ed]
LB[ca:b][da:a][bb:c][ac:d]

;B[ea]C[B1]MN[1]

;LB[ca:b][da:a][bb:c][ac:d]
)
