(;GM[1]FF[4]SZ[4:3]
GN[]
PC[http://senseis.xmp.net/?3x4Problems/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?3x4Problems/Attempts

]
PL[W]

AB[da][ac][bc][cc][dc]
AW[ab]

;W[ba]C[W1]MN[1]
;B[cb]C[B2]MN[2]
;W[ca]C[W3]MN[3]
;B[db]C[B4]MN[4]

;
)
