(;GM[1]FF[4]SZ[9:19]
GN[corner]
PC[http://senseis.xmp.net/?ForceMathematics]AP[GoWiki:2009]
DT[2010-02-09]
C[Diagram from http://senseis.xmp.net/?ForceMathematics

corner]
PL[B]

AB[da][fa][db][fb][gb][hb][ib][cc][dc][ad][bd][cd]
AW[ca][ea][bb][cb][eb][ac][bc][ec][fc][gc][hc][ic]

;B[aa]C[B1]MN[1]
;W[ha]C[W2]MN[2]

;
)
