(;GM[1]FF[4]SZ[19]
GN[How to use the black wall?]
PC[http://senseis.xmp.net/?BQM226]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BQM226

How to use the black wall?]
PL[B]

AB[dd][pd][qh][qi][qj][pk][pl][om][on][po][dp]
AW[ri][rj][qk][ql][pm][qm][qo][np][fq][pq]
LB[cf:k][cn:c][dn:a][qp:b]

;B[fp]C[B1]MN[1]
;W[gp]C[W2]MN[2]
;B[fo]C[B3]MN[3]
;W[eq]C[W4]MN[4]
;B[dq]C[B5]MN[5]
;W[jq]C[W6]MN[6]
;B[dj]C[B7]MN[7]

;LB[cf:k][cn:c][dn:a][qp:b]
)
