[Event "Interzonal-11b"]
[Site "Rio de Janeiro"]
[Date "1979.09.25"]
[Round "3"]
[White "Portisch, Lajos"]
[Black "Ivkov, Borislav"]
[Result "1-0"]
[WhiteElo "2640"]
[BlackElo "2525"]
1. d4 d5 2. c4 e6 3. Nc3 Be7 4. cxd5 exd5 5. Bf4 c6 6. e3 Bf5 7. Nge2 Nd7 8. Ng3 Bg6 9. Be2 Nf8 10. h4 Bxh4 11. Qb3 Bxg3 12. Bxg3 Qb6 13. Qa3 Ne7 14. Na4 Qd8 15. Nc5 Qb6 16. Na4 Qd8 17. Nc5 Qb6 18. Be5 f6 19. Bh2 Bf7 20. Bd6 Nfg6 21. Bd3 Nc8 22. Bg3 a5 23. O-O Nge7 24. Rfe1 Ra7 25. Qc3 a4 26. Rab1 Qd8 27. Bb8 b5 28. Bxa7 Nxa7 29. b3 axb3 30. axb3 O-O 31. Ra1 Nec8 32. Bf5 Re8 33. Ra6 Qc7 34. Rea1 Re7 35. Nd3 Be8 36. Qc5 Qb7 37. Nb4 Rc7 38. Be6+ Bf7 39. Bxc8 Nxc8 40. Rxc6 Rxc6 41. Nxc6 1-0