(;GM[1]FF[4]SZ[19]
GN[Var 2.b: descent]
PC[http://senseis.xmp.net/?ShapesRelatedToTheCarpentersSquare]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ShapesRelatedToTheCarpentersSquare

Var 2.b: descent]
PL[B]

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

;B[da]C[B1]MN[1]
;W[ab]C[W2]MN[2]
;B[bb]C[B3]MN[3]
;W[ac]C[W4]MN[4]

;
)
