(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[https://senseis.xmp.net/?GokyoShumyoSection4Problem87/Solution]AP[GoWiki:2009]
DT[2022-12-31]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection4Problem87/Solution

Solution]
PL[B]

AB[ka][bb][cb][fb][fc][ic][bd][fd][jd][kd][ce][ge][he][ie][ef][ff][jf]
AW[la][eb][kb][mb][cc][dc][ec][hc][jc][kc][mc][ed][gd][hd][id][ld][ee][fe]

;B[ib]C[B1]MN[1]
;W[hb]C[W2]MN[2]
;B[ea]C[B3]MN[3]
;W[da]C[W4]MN[4]
;B[fa]C[B5]MN[5]
;W[db]C[W6]MN[6]
;B[ia]C[B7]MN[7]
;W[ha]C[W8]MN[8]
;B[de]C[B9]MN[9]

;
)
