(;GM[1]FF[4]SZ[19]
GN[Ko]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem81/Solution]AP[GoWiki:2009]
DT[2023-02-01]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem81/Solution

Ko]
PL[W]

AB[ob][pb][pc][nd][pe][qe]
AW[ma][oa][nb][mc][oc][ne][nf][rf][pg][qg]

;W[od]C[W1]MN[1]
;B[rb]C[B2]MN[2]
;W[ra]C[W3]MN[3]
;B[qa]C[B4]MN[4]
;W[rc]C[W5]MN[5]
;B[rd]C[B6]MN[6]
;W[sb]C[W7]MN[7]
;B[qc]C[B8]MN[8]

;
)
