[Event "Interzonal-09a"]
[Site "Leningrad"]
[Date "1973.06.09"]
[Round "6"]
[White "Cuellar Gacharna, Miguel"]
[Black "Karpov, Anatoly"]
[Result "0-1"]

1. d4 Nf6 2. Nf3 c5 3. c4 cxd4 4. Nxd4 Nc6 5. Nc3 Qb6 6. e3 e6 7. Be2 Be7 8. O-O O-O 9. b3 a6 10. Bb2 d6 11. Qd2 Bd7 12. Rad1 Rfd8 13. g4 Qa7 14. g5 Ne8 15. Nf3 Rab8 16. e4 Bf8 17. Qf4 Ne7 18. Nh4 b5 19. Rd2 Bc6 20. Rfd1 Qa8 21. Bd3 Rd7 22. Qg4 Nc7 23. Nd5 bxc4 24. Nxe7+ Bxe7 25. bxc4 g6 26. Bc3 a5 27. Bc2 Ne8 28. Nf3 Rdd8 29. Nd4 Bd7 30. e5 Bf8 31. Ne2 d5 32. Rd3 Rbc8 33. cxd5 exd5 34. Qh4 Bf5 35. e6 fxe6 36. Nd4 Ng7 37. Nxf5 Nxf5 38. Qa4 Bg7 39. Bxg7 Kxg7 40. Bb3 Rc5 41. Re1 Qc6 42. Qf4 Qd6 43. Qd2 Kg8 44. f4 Ng7 45. Rd4 Qb6 46. Kh1 Rb5 47. Rc1 Rf8 48. Rd3 Rb4 49. Rf3 Qd6 50. f5 Nxf5 51. a3 Rh4 52. Bd1 Qe5 53. Qf2 Re4 54. Kg2 Nh4+ 55. Kh3 Nxf3 56. Bxf3 0-1