[Event "Interzonal-13a"]
[Site "Tunis"]
[Date "1985.05.11"]
[Round "11"]
[White "Portisch, Lajos"]
[Black "De Firmian, Nick E"]
[Result "1/2-1/2"]
[WhiteElo "2635"]
[BlackElo "2540"]

1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. Nd2 Bg7 8. Nc4 O-O 9. Bg5 Qe7 10. e3 b6 11. a4 Ba6 12. Rc1 Nbd7 13. b3 Bb7 14. Be2 Ne5 15. O-O h6 16. Bh4 Rad8 17. Kh1 Bc8 18. Qd2 Rfe8 19. Rfe1 Nxc4 20. bxc4 g5 21. Bg3 h5 22. h3 h4 23. Bh2 g4 24. hxg4 Nxg4 25. Bxg4 Bxg4 26. f3 Bh5 27. e4 Kh7 28. e5 dxe5 29. f4 e4 30. Nxe4 Qd7 31. a5 Kg8 32. Re3 Bd4 33. Ree1 Qf5 34. Ng5 bxa5 35. Bg1 Bxg1 36. Kxg1 a4 37. Qf2 a3 38. Qxh4 Bg6 39. Ne4 Kg7 40. Nc3 Rxe1+ 41. Rxe1 Rb8 42. d6 Qd3 43. Nd5 Qd4+ 44. Kh2 a2 45. d7 a1=Q 46. Rxa1 Qxa1 47. d8=Q Rxd8 48. Qxd8 Qd4 1/2-1/2