(;GM[1]FF[4]SZ[19]
GN[a above]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem104/Solution]AP[GoWiki:2009]
DT[2023-02-02]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem104/Solution

a above]
PL[B]

AB[gb][lb][fc][lc][pc][hd][ld][nd][od][qd][rd][le][me][ne][re][hf][jf][kf][qf][lg][pg]
AW[ib][kb][kc][nc][oc][rc][kd][md][pd][ke][oe][pe][qe][lf][mf][nf][of][kg][og]

;B[na]C[B1]MN[1]
;W[pb]C[W2]MN[2]
;B[qc]C[B3]MN[3]
;W[mb]C[W4]MN[4]
;B[la]C[B5]MN[5]
;W[ob]C[W6]MN[6]
;B[mc]C[B7]MN[7]
;W[nb]C[W8]MN[8]
;B[qb]C[B9]MN[9]

;
)
