(;GM[1]FF[4]SZ[19]
GN[Black to move]
PC[https://senseis.xmp.net/?GokyoSeimyoVolume3Problem6/Solution]AP[GoWiki:2009]
DT[2023-02-14]
C[Diagram from https://senseis.xmp.net/?GokyoSeimyoVolume3Problem6/Solution

Black to move]
PL[B]

AB[da][bb][db][dc][bd][dd][ce][cf][ef][bg][dg][dh][di][dj][ck][cl][el][bm][bn]
AW[ca][cb][bc][cc][cd][be][bf][cg][ch][ci][cj][bk][bl][cm][dm][bo][co][eo]

;B[bj]C[B1]MN[1]
;W[bi]C[W2]MN[2]
;B[ag]C[B3]MN[3]
;W[aj]C[W4]MN[4]
;B[ae]C[B5]MN[5]
;W[ad]C[W6]MN[6]
;B[af]C[B7]MN[7]

;
)
