(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?L1Group]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?L1Group

Solution]
PL[W]

AB[da][cb][cc][bd][cd][be][af]
AW[db][fb][dc][dd][ce][de][bf][bg][dg]
CR[da][af]

;W[bb]C[W1]MN[1]
;B[ab]C[B2]MN[2]
;W[ac]C[W3]MN[3]
;B[ba]C[B4]MN[4]

;CR[da][af]
)
