[Event "Interzonal-11b"]
[Site "Rio de Janeiro"]
[Date "1979.10.08"]
[Round "12"]
[White "Petrosian, Tigran V"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]
[WhiteElo "2610"]
[BlackElo "2640"]
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 6. O-O a6 7. a4 Nc6 8. Qe2 cxd4 9. Rd1 Be7 10. exd4 O-O 11. Nc3 Nd5 12. Qe4 Nf6 13. Qe2 Nd5 14. Bd3 Ncb4 15. Bb1 b6 16. Qe4 g6 17. Bh6 Re8 18. Qe5 Bf8 19. Bxf8 Rxf8 20. Ne4 Nc6 21. Qg3 Nce7 22. Nd6 1/2-1/2