(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem18/Solution]AP[GoWiki:2009]
DT[2023-01-30]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem18/Solution

Black to play]
PL[B]

AB[lc][oc][pc][qc][ld][nd]
AW[rb][ic][jc][mc][rc][hd][kd][pd][qd][le][ne][lf][pf]

;B[mb]C[B1]MN[1]
;W[md]C[W2]MN[2]
;B[nc]C[B3]MN[3]
;W[me]C[W4]MN[4]
;B[kb]C[B5]MN[5]
;W[kc]C[W6]MN[6]
;B[la]C[B7]MN[7]
;W[na]C[W8]MN[8]
;B[qb]C[B9]MN[9]
;W[ob]C[W10]MN[10]

;
)
