(;GM[1]FF[4]SZ[19]
GN[3-3 invasion alternative 2]
PC[http://senseis.xmp.net/?Butterfly]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?Butterfly

3-3 invasion alternative 2]
PL[W]

AB[eb][dc][gc][dd][ce][bf][cf][cg]
AW[db][cc][cd][be][de]

;W[bb]C[W1]MN[1]
;B[da]C[B2]MN[2]
;W[ad]C[W3]MN[3]
;B[af]C[B4]MN[4]

;
)
