[Event "57th US Open"]
[Site "Oklahoma City, OK USA"]
[Date "1956.07.19"]
[EventDate "?"]
[Round "4"]
[Result "1-0"]
[White "Robert B M Potter"]
[Black "Sonja Graf-Stevenson"]
[ECO "A09"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "39"]

1.Nf3 d5 2.c4 d4 3.e3 c5 4.b4 dxe3 5.fxe3 e5 6.Nxe5 Qh4+ 7.g3
Qe4 8.Nf3 Bg4 9.Be2 Nc6 10.Nc3 Qg6 11.b5 Nb4 12.O-O Bxf3
13.Bxf3 O-O-O 14.Be4 Qg5 15.Rxf7 Nh6 16.Rxb7 Bd6 17.Qf3 Rhf8
18.Qg2 Be5 19.Rxa7 Bxc3 20.Bf5+ 1-0