(;GM[1]FF[4]SZ[19]
GN[ko]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem30/Solution]AP[GoWiki:2009]
DT[2023-01-31]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem30/Solution

ko]
PL[B]

AB[ka][eb][ib][mb][nb][mc][jd][ld][md][nd][pd][qd][ne][re][nf][of][pf][qf][rf]
AW[hb][jb][lb][ob][ic][lc][nc][oc][qc][kd][od][rd][ie][ke][le][oe][pe][qe][hf][lg][ng][rg][mh][oh][qh]
CR[qc]

;B[rc]C[B1]MN[1]
;W[sd]C[W2]MN[2]
;B[qb]C[B3]MN[3]
;W[rb]C[W4]MN[4]
;B[pc]C[B5]MN[5]
;W[pb]C[W6]MN[6]
;B[ra]C[B7]MN[7]
;B[sb]C[B9]MN[9]
;W[sc]C[W10]MN[10]

;CR[qc]
)
