[Event "Interzonal-13a"]
[Site "Tunis"]
[Date "1985.04.27"]
[Round "1"]
[White "Portisch, Lajos"]
[Black "Zapata, Alonso"]
[Result "1/2-1/2"]
[WhiteElo "2635"]
[BlackElo "2535"]

1. d4 Nf6 2. c4 d6 3. Nc3 g6 4. e4 Bg7 5. f3 e5 6. Nge2 c6 7. Bg5 Nbd7 8. Qd2 O-O 9. d5 cxd5 10. cxd5 Nc5 11. Ng3 Qb6 12. Be2 Bd7 13. Be3 a5 14. O-O a4 15. Rac1 Rfc8 16. Nb1 Ne8 17. Na3 Bf8 18. Kh1 Qd8 19. Rc2 f6 20. Rfc1 Nc7 21. Qe1 N7a6 22. Bd2 b6 23. Qf1 Nc7 24. Be3 Rab8 25. Nb5 Nxb5 26. Bxb5 Qe8 27. Bxd7 Qxd7 28. Qd1 b5 29. b4 axb3 30. axb3 Be7 31. Nf1 Kf7 32. b4 Na6 33. Bd2 Bd8 34. Rc6 Rxc6 35. dxc6 Qe6 36. Ne3 Nc7 37. Nd5 Nxd5 38. exd5 Qc8 39. Qe2 Bc7 40. Bc3 Qa6 41. Ra1 Qb6 42. f4 Rg8 43. Rf1 Rf8 44. f5 Kg7 45. h4 Bb8 46. Qf2 Ba7 47. Qxb6 Bxb6 48. fxg6 Kxg6 49. Ra1 Kf5 50. Ra6 Bd4 51. Bxd4 exd4 52. Kg1 Ke4 53. Ra5 Ke3 54. Kf1 d3 55. Ke1 Rg8 56. Ra2 Rg4 57. Rf2 Rxb4 58. Rf3+ Ke4 59. Rxf6 Rb1+ 60. Kd2 Rb2+ 61. Kd1 Kxd5 62. c7 Rc2 63. Rf5+ Kd4 64. Rxb5 Rxc7 65. Rb6 d5 66. g4 Rc4 67. g5 Ke3 68. h5 Rg4 69. Re6+ Kd4 70. g6 h6 71. Re8 Rg1+ 72. Kd2 Rg2+ 73. Kd1 Rg5 74. Kd2 Rg1 75. Rf8 Rg2+ 76. Kd1 Rg1+ 77. Kd2 Rg2+ 1/2-1/2