(;GM[1]FF[4]SZ[3]
GN[B3 at B1 and B4 at B2]
PC[http://senseis.xmp.net/?ConstructionProblem7/Attempts]AP[GoWiki:2009]
DT[2014-05-27]
C[Diagram from http://senseis.xmp.net/?ConstructionProblem7/Attempts

B3 at B1 and B4 at B2]
PL[B]

AB[ab][bb]
AW[aa][cb]

;B[ca]C[B1]MN[1]
;W[ba]C[W2]MN[2]
;B[ca]C[B3]MN[3]
;W[ba]C[W4]MN[4]

;
)
