(;GM[1]FF[4]SZ[19]
GN[Ko]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem77/Solution]AP[GoWiki:2009]
DT[2023-02-01]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem77/Solution

Ko]
PL[B]

AB[pb][qb][rb][oc][qc][od][of][og][ph][pi][pj][qk][rk][ql]
AW[pc][rc][pd][qd][pf][pg][qh][qi][rj]

;B[rf]C[B1]MN[1]
;W[re]C[W2]MN[2]
;B[qf]C[B3]MN[3]
;W[pe]C[W4]MN[4]
;B[sc]C[B5]MN[5]
;W[sd]C[W6]MN[6]

;
)
