(;GM[1]FF[4]SZ[19]
GN[Ko]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem38/Solution]AP[GoWiki:2009]
DT[2023-01-30]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem38/Solution

Ko]
PL[W]

AB[oa][mb][nb][lc][md][nd][od][qd][qe][re][of][qf]
AW[na][nc][oc][qc][rc][pd][rd]

;W[ob]C[W1]MN[1]
;B[ra]C[B2]MN[2]
;W[rb]C[W3]MN[3]
;B[pa]C[B4]MN[4]
;W[qa]C[W5]MN[5]
;B[qb]C[B6]MN[6]
;W[pb]C[W7]MN[7]

;
)
