(;GM[1]FF[4]SZ[19]
GN[]
PC[http://senseis.xmp.net/?GokyoShumyoSection2Problem20/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection2Problem20/Attempts

]
PL[W]

AB[cb][eb][cc][dc][bd]
AW[fb][gb][ec][cd][dd][ed][be][cf]

;W[ad]C[W1]MN[1]
;B[bc]C[B2]MN[2]
;W[ba]C[W3]MN[3]
;B[fa]C[B4]MN[4]

;
)
