(;GM[1]FF[4]SZ[19]
GN[Preventing invasion - extension Dia.4]
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.4]
PL[W]

AB[db][ec][cd][cf]
AW[fc]
CR[fc][cf]
SQ[db]
LB[cc:a][bd:c][be:b][ch:x][ci:y]

;W[dc]C[W1]MN[1]
;B[dd]C[B2]MN[2]
;W[eb]C[W3]MN[3]

;CR[fc][cf]
SQ[db]
LB[cc:a][bd:c][be:b][ch:x][ci:y]
)
