(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[https://senseis.xmp.net/?GokyoShumyoSection6Problem50/Solution]AP[GoWiki:2009]
DT[2023-01-23]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection6Problem50/Solution

Black to play]
PL[B]

AB[ga][bb][fb][hb][cc][gc][bd][gd][ce][ge][cf][dg][dh]
AW[cb][eb][ib][ec][hc][ic][fd][ie][df][ff][eg][hg]

;B[ed]C[B1]MN[1]
;W[dd]C[W2]MN[2]
;B[ee]C[B3]MN[3]
;W[fe]C[W4]MN[4]
;B[fc]C[B5]MN[5]
;W[de]C[W6]MN[6]
;B[ea]C[B7]MN[7]
;W[da]C[W8]MN[8]
;B[dc]C[B9]MN[9]
;W[ef]C[W10]MN[10]

;
)
