[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1975.01.20"]
[Round "6"]
[White "Popov, Luben"]
[Black "Portisch, Lajos"]
[Result "0-1"]
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb4+ 5. Bd2 a5 6. Bg2 Ba6 7. Bxb4 axb4 8. Nbd2 O-O 9. a3 Nc6 10. O-O Bb7 11. Qb3 Qe7 12. axb4 Qxb4 13. e3 Qxb3 14. Nxb3 Nb4 15. Rfd1 Rfb8 16. Ne1 Bxg2 17. Kxg2 Ne4 18. Rxa8 Rxa8 19. Ra1 Rxa1 20. Nxa1 Nd2 21. b3 Nc6 22. Nf3 Ne4 23. Kf1 g5 24. h3 f5 25. Ke2 Nb4 26. Ne1 Nc6 27. Nf3 Kg7 28. Nd2 Nb4 29. Nf1 g4 30. hxg4 fxg4 31. f3 gxf3+ 32. Kxf3 d5 33. cxd5 exd5 34. Nh2 h5 35. Kg2 Kg6 36. Nf3 Kf5 37. Nh4+ Kg4 38. Ng6 Nc6 39. Nf4 Ne7 40. Ne2 Nf5 41. Nc2 Nf6 42. Kf2 c6 43. Kg2 Ne4 44. Nf4 Nexg3 45. Ng6 Nh4+ 46. Nxh4 Kxh4 47. Nb4 Nf5 48. Nxc6 Nxe3+ 49. Kf2 Nf5 50. Nb4 Ne7 51. Kf3 Kg5 52. Kg3 h4+ 53. Kh3 Ng6 54. Na6 Nf4+ 55. Kh2 Kf5 56. Nc7 Ke4 57. Na8 Kxd4 58. Nxb6 Kc5 59. Nd7+ Kb4 60. Ne5 Kxb3 61. Nf3 Ng6 0-1