(;GM[1]FF[4]SZ[19]
GN[Enclosing the corner]
PC[http://senseis.xmp.net/?443563Enclosure]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?443563Enclosure

Enclosing the corner]
PL[B]

AB[fc][dd]

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

;
)
