(;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[da][ab][db][bc][dc][cd][dd]
AW[bb][cb][eb][gb][ec][ed][be][ce][de][ee][bg]
LB[aa:a]

;W[ba]C[W7]MN[7]
;B[bd]C[B8]MN[8]
;W[ad]C[W9]MN[9]
;B[ca]C[B10]MN[10]

;LB[aa:a]
)
