[Event "Interzonal-12b"]
[Site "Toluca"]
[Date "1982.08.22"]
[Round "9"]
[White "Nunn, John DM"]
[Black "Ivanov, Igor Vasilievich"]
[Result "1/2-1/2"]
[WhiteElo "2590"]
[BlackElo "2515"]

1. e4 e5 2. Bc4 Nf6 3. d3 Nc6 4. Nf3 Be7 5. O-O O-O 6. Bb3 d6 7. c3 Kh8 8. Nbd2 Ng8 9. d4 Bf6 10. Nc4 Bg4 11. dxe5 Nxe5 12. Ncxe5 dxe5 13. Be3 Qe7 14. h3 Rad8 15. Qe2 Bxf3 16. Qxf3 Bg5 17. Bxg5 Qxg5 18. Rad1 Nh6 19. Rd3 Qe7 20. Rfd1 Rd6 21. Rxd6 cxd6 22. Qd3 Rd8 23. Qd5 g6 24. a4 Kg7 25. a5 Ng8 26. Qb5 Nf6 27. Bd5 Rb8 28. Rd3 Qc7 29. Qa4 b6 30. axb6 Rxb6 31. Qa5 1/2-1/2