(;GM[1]FF[4]SZ[19]
GN[Variation: another ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection5Problem8/Solution]AP[GoWiki:2009]
DT[2022-12-27]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection5Problem8/Solution

Variation: another ko]
PL[W]

AB[ea][fb][bc][dc][ec][fc][gc][hc][bd][ed][be][ce][de][dg]
AW[ca][fa][bb][cb][db][eb][gb][hb][cc][ic][cd][dd][id][ee][fe]

;W[ab]C[W1]MN[1]
;B[ga]C[B2]MN[2]
;W[ib]C[W3]MN[3]
;B[ge]C[B4]MN[4]
;W[gd]C[W5]MN[5]
;B[hd]C[B6]MN[6]
;W[he]C[W7]MN[7]
;B[fd]C[B8]MN[8]
;W[gf]C[W9]MN[9]
;B[ff]C[B10]MN[10]

;
)
