[Event "Interzonal-11b"]
[Site "Rio de Janeiro"]
[Date "1979.10.07"]
[Round "11"]
[White "Portisch, Lajos"]
[Black "Balashov, Yuri S"]
[Result "1-0"]
[WhiteElo "2640"]
[BlackElo "2600"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 c5 6. Nf3 d5 7. O-O dxc4 8. Bxc4 Nbd7 9. Qe2 a6 10. a4 Qc7 11. Na2 b5 12. Bd3 Ba5 13. axb5 axb5 14. Bxb5 Bb7 15. Rd1 Rab8 16. dxc5 Bxf3 17. gxf3 Nxc5 18. b4 Nb3 19. Rb1 Qe5 20. bxa5 Rxb5 21. Kh1 Qb8 22. Ba3 Rc8 23. Bd6 Qb7 24. a6 Qb6 25. Bc7 Qc6 26. a7 h6 27. Bb8 Nd7 28. Rd6 Qb7 29. Rxd7 Qxd7 30. a8=Q Rbxb8 31. Qe4 1-0