(;GM[1]FF[4]SZ[19]
GN[3-3 invasion alternative]
PC[http://senseis.xmp.net/?Butterfly]AP[GoWiki:2009]
DT[2015-03-22]
C[Diagram from http://senseis.xmp.net/?Butterfly

3-3 invasion alternative]
PL[B]

AB[da][cb][eb][dc][gc][dd][ce][bf][cf][cg]
AW[ba][bb][cc][ad][cd][be][de]

;B[af]C[B16]MN[16]
;W[ab]C[W17]MN[17]

;
)
