[Event "Interzonal-10a"]
[Site "Biel"]
[Date "1976.07.16"]
[Round "5"]
[White "Portisch, Lajos"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[WhiteElo "2625"]
[BlackElo "2635"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 d5 6. Nf3 O-O 7. O-O dxc4 8. Bxc4 a6 9. a3 cxd4 10. axb4 dxc3 11. Qxd8 Rxd8 12. bxc3 Ne4 13. Bb2 Nd6 14. Be2 b5 15. Nd2 Bb7 16. c4 bxc4 17. Nxc4 Nc6 18. Nxd6 Rxd6 19. Bc3 h6 20. Rfc1 Na7 21. Be1 Rb6 22. Rc7 Rd8 23. Rac1 Nb5 24. R7c5 f6 25. f3 e5 26. Bf1 Rd7 27. Kf2 Kf8 28. g4 Ke7 29. h4 Bd5 30. h5 Be6 31. Kg3 Rdd6 32. f4 exf4+ 33. exf4 Rb8 34. f5 Bd5 35. Kh3 Rdd8 36. Bg3 Ra8 37. Bf2 Kf8 38. R5c2 Be4 39. Ra2 Kg8 40. Re1 Bd5 41. Raa1 Bf7 42. Bc5 Nc7 43. Kg3 Rd7 44. Rad1 Rad8 45. Rxd7 Rxd7 46. Re7 Rd1 47. Kf2 Nb5 48. Rb7 Ra1 49. Rb8+ Kh7 50. Bg2 Ra2+ 51. Kg3 Ra3+ 52. Kf2 Ra2+ 53. Kg1 Nc3 54. Rd8 a5 55. bxa5 Rxa5 56. Bb4 Ra1+ 57. Kh2 Ne2 58. Rd2 Ra2 59. Rxa2 Bxa2 60. Bc6 Nf4 1/2-1/2