(;GM[1]FF[4]SZ[19]
GN[Vulnerable hoshi: which approach?]
PC[http://senseis.xmp.net/?BQM131]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BQM131

Vulnerable hoshi: which approach?]
PL[W]

AB[pd][io][jo][jp][pp][jq][jr]
AW[jn][kn][ko][kp][kq][kr]
CR[pp]
LB[pl:b][ql:c][nq:d][qq:a]

;W[qn]C[W1]MN[1]
;B[rp]C[B2]MN[2]
;W[qk]C[W3]MN[3]
;B[oq]C[B4]MN[4]

;CR[pp]
LB[pl:b][ql:c][nq:d][qq:a]
)
