(;GM[1]FF[4]SZ[19]
GN[surprising ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection3Problem42/Solution]AP[GoWiki:2009]
DT[2023-01-03]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection3Problem42/Solution

surprising ko]
PL[B]

AB[fa][db][fb][hb][ib][dc][cd][dd][gd][hd]
AW[da][ea][cb][cc][ic][jc][kc][bd][fd][ce][fe][ge][je][cf][ef][if]
LB[eb:c][ed:b][be:a]

;B[fc]C[B1]MN[1]
;W[jb]C[W2]MN[2]
;B[bc]C[B3]MN[3]
;W[bb]C[W4]MN[4]
;B[ba]C[B5]MN[5]
;W[ac]C[W6]MN[6]
;B[ab]C[B7]MN[7]

;LB[eb:c][ed:b][be:a]
)
