[Event "Petropolis Interzonal"]
[Site "Petropolis"]
[Date "1973.??.??"]
[Round "7"]
[White "Panno, Oscar"]
[Black "Biyiasas, Peter"]
[Result "1/2-1/2"]
[WhiteElo "2580"]
[BlackElo "2395"]
[ECO "A42"]

1.c4 g6 2.e4 d6 3.d4 e5 4.Ne2 Nc6 5.Nbc3 Bg7 6.Be3 Nh6 7.f3 f5 8.Qd2 fxe4
9.Nxe4 Nf5 10.Bg5 Bh6 11.Bxd8 Bxd2+ 12.Kxd2 Kxd8 13.dxe5 Nxe5 14.N2c3 Be6
15.b3 c6 16.Re1 Kd7 17.f4 Nf7 18.Bd3 Rac8 19.Rhf1 h5 20.Nd5 Nd8 21.Ne3 Nxe3
22.Rxe3 Bf5 23.h4 Ne6 24.g3 Rh7 25.Rfe1 Re7 26.Bf1 Rce8 27.Bg2 Nc7 28.Rd3 d5
29.Nc5+ Kc8 30.Rde3 Rxe3 31.Rxe3 dxc4 32.bxc4 Rd8+ 33.Kc3 Rd1 34.Be4 Rc1+
35.Kb3 b5 36.Rc3 Re1 37.Bxf5+ gxf5 38.cxb5 Nxb5 39.Rd3 Kc7 40.a4 Nd6 41.Na6+ Kd7 1/2-1/2