(;GM[1]FF[4]SZ[19]
GN[Solution:ko]
PC[https://senseis.xmp.net/?GokyoSeimyoVolume3Problem22/Solution]AP[GoWiki:2009]
DT[2023-02-15]
C[Diagram from https://senseis.xmp.net/?GokyoSeimyoVolume3Problem22/Solution

Solution:ko]
PL[B]

AB[bb][cb][cc][dd][de][df][bg][dg][eh][di][ei][bj][cj][dk]
AW[bc][bd][cd][bf][cg][ch][dh][bi][ci][aj][bk][cl]

;B[be]C[B1]MN[1]
;W[ce]C[W2]MN[2]
;B[cf]C[B3]MN[3]
;W[ae]C[W4]MN[4]
;B[ah]C[B5]MN[5]
;W[ai]C[W6]MN[6]
;B[af]C[B7]MN[7]

;
)
