(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem21/Solution]AP[GoWiki:2009]
DT[2023-01-30]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem21/Solution

Solution]
PL[B]

AB[pb][md][nd][od][pd][of]
AW[ic][lc][mc][nc][oc][le][oe][qe][nf][qf][og]
LB[ke:a][mf:b]

;B[pc]C[B1]MN[1]
;W[rc]C[W2]MN[2]
;B[ld]C[B3]MN[3]
;W[kd]C[W4]MN[4]
;B[kc]C[B5]MN[5]
;W[jd]C[W6]MN[6]
;B[kb]C[B7]MN[7]
;W[lb]C[W8]MN[8]
;B[ma]C[B9]MN[9]
;W[la]C[W10]MN[10]

;LB[ke:a][mf:b]
)
