[Event "Petropolis Interzonal"]
[Site "Petropolis"]
[Date "1973.??.??"]
[Round "11"]
[White "Portisch, Lajos"]
[Black "Hort, Vlastimil"]
[Result "1/2-1/2"]
[WhiteElo "2645"]
[BlackElo "2610"]
[ECO "D18"]

1.Nf3 d5 2.d4 Nf6 3.c4 c6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O O-O
9.Nh4 Bg4 10.f3 Bh5 11.g4 Bg6 12.e4 Nbd7 13.Ng2 c5 14.Na2 Ba5 15.dxc5 Bc7
16.Be3 Qe7 17.b4 Rfd8 18.Qb3 a5 19.Rad1 axb4 20.Qxb4 Ne5 21.Be2 Nc6 22.Qc4 Nd7
23.f4 f6 24.Nc3 Na5 25.Qb5 Be8 26.Bf2 Rdc8 27.Rd2 b6  1/2-1/2

