[Event "Interzonal-13a"]
[Site "Tunis"]
[Date "1985.05.16"]
[Round "15"]
[White "Portisch, Lajos"]
[Black "Sosonko, Gennadi"]
[Result "1/2-1/2"]
[WhiteElo "2635"]
[BlackElo "2535"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3 Bb7 5. Nc3 d5 6. cxd5 Nxd5 7. e3 g6 8. Nxd5 exd5 9. Bd2 Nd7 10. Qa4 a6 11. Rc1 Bg7 12. Bb4 Rc8 13. Bd3 a5 14. Bd2 O-O 15. Bb5 Nb8 16. O-O c6 17. Be2 Nd7 18. Rfd1 Qe7 19. Qb3 Ra8 20. a4 Rfc8 21. Bd3 Qd6 22. Bc3 c5 23. Qa3 Rc7 24. Bb5 Rac8 25. h3 Nf6 26. Nd2 Ne4 27. Nxe4 dxe4 28. Rc2 Qd5 29. Rcd2 c4 30. Qa2 f5 31. Rc2 f4 32. exf4 Bh6 33. Re1 Bxf4 34. Rce2 e3 35. fxe3 Bxe3+ 36. Kh1 Rf8 37. Qa3 Bf2 38. Qxf8+ Kxf8 39. Rxf2+ Rf7 40. Re8+ Kg7 41. Rfe2 Rf1+ 42. Kh2 Qd6+ 43. R2e5 Bd5 44. Re7+ Rf7 45. Rxf7+ Kxf7 46. Kg1 h6 47. Kh2 Qd8 48. Kg1 g5 49. Be1 Be6 50. Bc3 Qa8 51. d5 Bxd5 52. Re8 1/2-1/2