(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[https://senseis.xmp.net/?IgoHatsuyoRonProblem73/Solution]AP[GoWiki:2009]
DT[2023-02-01]
C[Diagram from https://senseis.xmp.net/?IgoHatsuyoRonProblem73/Solution

Black to play]
PL[B]

AB[jb][nb][ob][hc][ic][kc][mc][pc][gd][ld][pd][ge][ie][ke][le][me][oe][re][jf][kf][mf][nf][fg][gg][hg][ig][kg][mg][og][pg][qg][kh][mh][gi][ji][li][ni][pi][qi][ij][lj][oj][jk][lk][nk][ll]
AW[lb][lc][jd][kd][md][nd][je][ne][hf][if][of][pf][jg][lg][ng][ih][jh][lh][nh][oh][ki][mi][kj][mj]
CR[lh]

;B[lf]C[B1]MN[1]

;CR[lh]
)
