(;GM[1]FF[4]SZ[19]
GN[Failure: defending from the wrong side leads to a ko.]
PC[http://senseis.xmp.net/?ShapesRelatedToTheCarpentersSquare]AP[GoWiki:2009]
DT[2011-05-15]
C[Diagram from http://senseis.xmp.net/?ShapesRelatedToTheCarpentersSquare

Failure: defending from the wrong side leads to a ko.]
PL[W]

AB[db][eb][dc][bd][cd][dd]
AW[fb][ec][gc][ed][be][ce][de][ee][bg]

;W[bb]C[W1]MN[1]
;B[bc]C[B2]MN[2]
;W[cb]C[W3]MN[3]
;B[ab]C[B4]MN[4]
;W[aa]C[W5]MN[5]
;B[ba]C[B6]MN[6]
;W[ca]C[W7]MN[7]

;
)
