(;GM[1]FF[4]SZ[19]
GN[3-3 invasion becomes ko]
PC[https://senseis.xmp.net/?Butterfly]AP[GoWiki:2009]
DT[2020-08-12]
C[Diagram from https://senseis.xmp.net/?Butterfly

3-3 invasion becomes ko]
PL[W]

AB[gc][dd][cg]
LB[ca:c][da:b][ea:e][bb:a][fb:f][ee:d]

;W[cc]C[W1]MN[1]
;B[dc]C[B2]MN[2]
;W[cd]C[W3]MN[3]
;B[ce]C[B4]MN[4]
;W[be]C[W5]MN[5]
;B[bf]C[B6]MN[6]
;W[de]C[W7]MN[7]
;B[cf]C[B8]MN[8]
;W[db]C[W9]MN[9]
;B[eb]C[B10]MN[10]

;LB[ca:c][da:b][ea:e][bb:a][fb:f][ee:d]
)
