(;GM[1]FF[4]SZ[19]
GN[Ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection4Problem40/Solution]AP[GoWiki:2009]
DT[2022-12-29]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection4Problem40/Solution

Ko]
PL[W]

AB[ga][gb][ec][fc][jc][ed][fd][id][ge][gf][if]
AW[fb][hb][dc][gc][cd][gd][de][fe][ff][fg]

;W[hc]C[W1]MN[1]
;B[eb]C[B2]MN[2]
;W[db]C[W3]MN[3]
;B[da]C[B4]MN[4]
;W[ca]C[W5]MN[5]
;B[fa]C[B6]MN[6]

;
)
