(;GM[1]FF[4]SZ[19]
GN[Weak defense]
PC[https://senseis.xmp.net/?TsumegoFromGames51/Solution]AP[GoWiki:2009]
DT[2022-12-15]
C[Diagram from https://senseis.xmp.net/?TsumegoFromGames51/Solution

Weak defense]
PL[B]

AB[bb][bc][cc][cd][dd][de][ef][cg][dg][eg][di][dj][ck][dk]
AW[bd][be][cf][df][bg][ch][ci][cj]
LB[ce:a]

;B[ad]C[B1]MN[1]
;W[ae]C[W2]MN[2]
;B[ak]C[B3]MN[3]
;W[ai]C[W4]MN[4]
;B[ah]C[B5]MN[5]
;W[bh]C[W6]MN[6]
;B[bj]C[B7]MN[7]

;LB[ce:a]
)
