(;GM[1]FF[4]SZ[19]
GN[White to make ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection3Problem86/Solution]AP[GoWiki:2009]
DT[2023-01-21]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection3Problem86/Solution

White to make ko]
PL[W]

AB[db][hb][ib][dc][fc][gc][dd][ed]
AW[bb][cb][jb][ec][hc][ic][kc][cd][fd][gd][ce][de][ee]
LB[eb:b][gb:a]

;W[ha]C[W1]MN[1]
;B[ga]C[B2]MN[2]
;W[fa]C[W3]MN[3]
;B[fb]C[B4]MN[4]

;LB[eb:b][gb:a]
)
