(;GM[1]FF[4]SZ[19]
GN[White mistake]
PC[http://senseis.xmp.net/?ShapesRelatedToTheCarpentersSquare]AP[GoWiki:2009]
DT[2009-05-27]
C[Diagram from http://senseis.xmp.net/?ShapesRelatedToTheCarpentersSquare

White mistake]
PL[W]

AB[bb][db][dc][bd][cd][dd]
AW[eb][gb][bc][ec][be][ce][de][ee][bg]

;W[ad]C[W3]MN[3]
;B[ab]C[B4]MN[4]

;
)
