(;GM[1]FF[4]SZ[19]
GN[not really a carpenter's square]
PC[http://senseis.xmp.net/?WeakCarpentersSquare]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?WeakCarpentersSquare

not really a carpenter's square]
PL[W]

AB[db][dc][bd][cd][be]
AW[eb][fb][ec][ed][ce][de][bf][cf]

;W[bb]C[W1]MN[1]
;B[cb]C[B2]MN[2]
;W[bc]C[W3]MN[3]
;B[ba]C[B4]MN[4]
;W[da]C[W5]MN[5]
;B[ac]C[B6]MN[6]
;W[ab]C[W7]MN[7]
;B[dd]C[B8]MN[8]
;W[ad]C[W9]MN[9]
;B[ae]C[B10]MN[10]

;
)
