[Event "Capablanca Memorial-10"]
[Site "Cienfuegos"]
[Date "1973.02.25"]
[Round "6"]
[White "De Greif, Boris"]
[Black "Spassov, Liuben"]
[Result "0-1"]

1. c4 Nf6 2. Nc3 g6 3. e4 d6 4. d4 Bg7 5. h3 O-O 6. Be3 c6 7. g4 Qa5 8. Bg2 e5 9. Ne2 Nbd7 10. O-O Re8 11. d5 Qc7 12. Qd2 Rf8 13. Rfd1 Ne8 14. Ng3 Nb6 15. b3 c5 16. Qd3 Bd7 17. Rac1 Nc8 18. Kh2 Ne7 19. Rg1 a6 20. a4 b6 21. Bf1 f5 22. gxf5 gxf5 23. Nh5 f4 24. Bd2 Ng6 25. Be2 Nf6 26. Nxg7 Kxg7 27. Rg5 Kh8 28. Rcg1 Rg8 29. Bh5 Nh4 30. Bf7 Rxg5 31. Rxg5 Bxa4 32. Be6 Bd7 33. f3 Qc8 34. Be1 Ng6 35. h4 Bxe6 36. dxe6 Qxe6 37. h5 Ne7 38. Bh4 h6 39. Rg2 Rg8 40. Rxg8+ Nexg8 41. Na4 b5 42. cxb5 axb5 43. Qxb5 Nxh5 44. Nc3 Qg6 45. Qd3 Ng7 46. Bf2 Ne7 47. Qa6 Qe6 48. Qb7 Qf6 49. Nd5 Nxd5 50. Qxd5 Qe7 51. Kg2 Ne6 52. Kf1 Qd7 53. Bh4 Kg7 54. Kg2 Nd4 55. Bf2 Qe6 56. Qb7+ Qf7 57. Qb8 Qxb3 58. Qc7+ Qf7 0-1