[Event "Interzonal-12b"]
[Site "Toluca"]
[Date "1982.08.16"]
[Round "5"]
[White "Portisch, Lajos"]
[Black "Ivanov, Igor Vasilievich"]
[Result "1/2-1/2"]
[WhiteElo "2630"]
[BlackElo "2515"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 d5 5. cxd5 exd5 6. Nc3 Be7 7. Bf4 O-O 8. e3 Bf5 9. Be2 Ne4 10. Qb3 Be6 11. Nb5 Nd6 12. Nc3 Ne4 13. Rd1 Bd6 14. Bxd6 Qxd6 15. O-O c6 16. Qc2 Nxc3 17. Qxc3 Nd7 18. Ba6 Bg4 19. Kh1 Rae8 20. Rc1 Re6 21. Ng1 Rh6 22. h3 Bf5 23. Bd3 Bxd3 24. Qxd3 c5 25. dxc5 Nxc5 26. Qc3 Ne4 27. Qd4 g5 28. Ne2 Rh4 29. Qd1 f5 30. Nc3 Nxc3 31. Rxc3 f4 32. e4 f3 33. Rxf3 Rxf3 34. Qxf3 Rxe4 35. Qf5 Re5 36. Qg4 Qe6 37. Qg3 h6 38. Kh2 Kg7 39. Rc1 Qf6 40. Kg1 Re7 41. b4 d4 42. Rd1 Rd7 43. Qg4 Rd6 44. Rd3 Qe5 45. g3 Kg6 46. h4 h5 47. Qd1 gxh4 48. gxh4 Kg7 49. Kf1 Qd5 50. Rg3+ Rg6 51. Qd3 Rg4 52. Rxg4+ hxg4 53. h5 Qxh5 54. Qxd4+ Kf7 55. Qf4+ Ke6 56. Qe3+ Qe5 1/2-1/2