[Event "Interzonal-10a"]
[Site "Biel"]
[Date "1976.07.31"]
[Round "15"]
[White "Portisch, Lajos"]
[Black "Byrne, Robert Eugene"]
[Result "1/2-1/2"]
[WhiteElo "2625"]
[BlackElo "2540"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 Nbd7 5. Bf4 dxc4 6. e3 Nd5 7. Bxc4 Nxf4 8. exf4 Be7 9. d5 Nb6 10. Bb5+ Kf8 11. dxe6 Qxd1+ 12. Rxd1 Bxe6 13. O-O c6 14. Be2 Nd5 15. Nxd5 Bxd5 16. b3 Rd8 17. Ne5 f6 18. Nc4 g6 19. Ne3 Be6 20. Bc4 Bc8 21. Rxd8+ Bxd8 22. Nc2 Bb6 23. Re1 h5 24. Bd3 f5 25. Ne3 Bc7 26. g3 Rh7 27. Nc4 Re7 28. Rc1 Kf7 29. h4 Be6 30. Kf1 Kf6 31. b4 Bb6 32. a4 Bd4 33. Rc2 Bd5 34. Nd2 Rd7 35. Bc4 a6 36. Bxd5 Rxd5 37. Nb3 Bb6 38. Ke2 Ke6 39. Rc1 Kd6 40. Rc2 a5 41. bxa5 Bxa5 42. Rc4 b6 43. f3 c5 44. Rc2 Kc6 45. Rc1 Bb4 46. Rc2 Rd8 47. Nc1 Ra8 48. Nd3 Rxa4 49. Ne5+ Kd5 50. Nxg6 c4 51. Ne5 b5 52. g4 fxg4 53. fxg4 hxg4 54. Nxg4 Ke4 55. Nf6+ Kd4 56. h5 Ra6 57. Ng4 c3 58. h6 Bf8 59. h7 Bg7 60. Rc1 Ke4 61. Nf2+ Kxf4 62. Nd3+ Kf5 63. Rh1 Ra8 64. Rh5+ Kg4 1/2-1/2