(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem99/Solution]AP[GoWiki:2009]
DT[2023-02-02]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem99/Solution

Black to play]
PL[B]

AB[ib][qb][gc][oc][qc][ld][md][qd][me][qe][kf][mf]
AW[pb][jc][mc][pc][nd][od][ie][je][le][of][jg][ng][kh][mh][ph]

;B[lc]C[B1]MN[1]
;W[kb]C[W2]MN[2]
;B[lb]C[B3]MN[3]
;W[ka]C[W4]MN[4]
;B[nc]C[B5]MN[5]
;W[nb]C[W6]MN[6]
;B[mb]C[B7]MN[7]
;W[ob]C[W8]MN[8]
;B[oe]C[B9]MN[9]
;W[ne]C[W10]MN[10]

;
)
