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

Main line]
PL[W]

AB[ca][bb][cb][db][cc][ad][bd][cd][ae]
AW[fa][eb][fb][dc][dd][be][ce][ee][af][bg]

;W[da]C[W1]MN[1]
;B[bc]C[B2]MN[2]
;W[ab]C[W3]MN[3]
;B[aa]C[B4]MN[4]

;
)
