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

Preventing invasion - dia. 1]
PL[B]

AB[ec][cd]

;B[be]C[B1]MN[1]

;
)
