(;GM[1]FF[4]SZ[19]
GN[Weak defense]
PC[https://senseis.xmp.net/?GokyoShumyoSection3Problem67/Solution]AP[GoWiki:2009]
DT[2023-01-21]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection3Problem67/Solution

Weak defense]
PL[B]

AB[ia][jb][pb][qb][rb][hc][jc][rc][kd][ld][od][qd][ie][qe][lf][nf][of][qg]
AW[ja][pa][kb][ob][kc][mc][pc][qc][md][pd][ne][oe][pe]
LB[ka:a]

;B[na]C[B1]MN[1]
;W[oa]C[W2]MN[2]
;B[nb]C[B3]MN[3]
;W[nc]C[W4]MN[4]
;B[oc]C[B5]MN[5]
;W[nd]C[W6]MN[6]

;LB[ka:a]
)
