(;GM[1]FF[4]SZ[19]
GN[Preventing invasion - extension Dia.3]
PC[http://senseis.xmp.net/?StrengtheningA3453Enclosure]AP[GoWiki:2009]
DT[2011-12-01]
C[Diagram from http://senseis.xmp.net/?StrengtheningA3453Enclosure

Preventing invasion - extension Dia.3]
PL[W]

AB[ec][cd][cf]
CR[cf]
LB[ab:c][db:a][bd:b]

;W[dc]C[W1]MN[1]
;B[dd]C[B2]MN[2]
;W[eb]C[W3]MN[3]
;B[fc]C[B4]MN[4]
;W[cc]C[W5]MN[5]
;B[bc]C[B6]MN[6]
;W[bb]C[W7]MN[7]

;CR[cf]
LB[ab:c][db:a][bd:b]
)
