(;GM[1]FF[4]SZ[7:3]
GN[Variation 1]
PC[http://senseis.xmp.net/?MathematicalTermForce]AP[GoWiki:2009]
DT[2010-01-14]
C[Diagram from http://senseis.xmp.net/?MathematicalTermForce

Variation 1]
PL[W]

AB[da][ea][fa][fb][gb][dc][ec][fc]
AW[ba][ca][ab][bb][bc][cc]

;W[eb]C[W1]MN[1]
;B[cb]C[B2]MN[2]
;W[db]C[W3]MN[3]

;
)
