[Event "Petropolis Interzonal"]
[Site "Petropolis"]
[Date "1973.??.??"]
[Round "9"]
[White "Portisch, Lajos"]
[Black "Ivkov, Borislav"]
[Result "1-0"]
[WhiteElo "2645"]
[BlackElo "2535"]
[ECO "D78"]

1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.c4 c6 5.O-O O-O 6.d4 d5 7.Qa4 Nbd7 8.cxd5 Nb6
9.Qa3 cxd5 10.Nc3 Nc4 11.Qb4 e6 12.Bf4 Re8 13.Ne5 Bf8 14.Qb3 Nd6 15.Bg5 Be7
16.Rfd1 Nf5 17.e4 Nxe4 18.Bxe7 Qxe7 19.Nxe4 dxe4 20.Bxe4 Rd8 21.Qc3 Nd6 22.Bg2 Bd7
23.Qa3 Be8 24.Rac1 Kf8 25.d5 exd5 26.Rxd5 f6 27.Nd3 Bc6 28.Re1 Qc7 29.Nf4 Bxd5
30.Bxd5 Re8 31.Ne6+ Rxe6 32.Rxe6 Rd8 33.Rxf6+ Kg7 34.Qf3 Rd7 35.Rf8 Nf5 36.Rg8+ Kh6
37.Be6  1-0

