[Event "Interzonal-04"]
[Site "Portoroz"]
[Date "1958.08.27"]
[Round "13"]
[White "De Greif, Boris"]
[Black "Rossetto, Hector"]
[Result "1/2-1/2"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. c4 O-O 5. O-O d6 6. Nc3 Nc6 7. d3 e5 8. Rb1 Bg4 9. h3 Bd7 10. b4 Re8 11. e4 Nh5 12. b5 Ne7 13. Nh4 Nf6 14. Ne2 a6 15. a4 axb5 16. axb5 c6 17. bxc6 bxc6 18. Bb2 Qc7 19. Qc1 c5 20. f4 Nc6 21. f5 Qd8 22. Bc3 Ra2 23. Rb2 Rxb2 24. Bxb2 Nb4 25. Qe3 Qe7 26. Bc1 Ba4 27. Bd2 Rb8 28. Qf3 Bc2 29. Nc1 Nh5 30. Rf2 Ba4 31. fxg6 fxg6 32. Nf5 Qf8 33. Qe2 Qd8 34. Nxg7 Nxg7 35. h4 Bd7 36. Qf3 Be6 37. Bg5 Qd7 38. Kh2 Nc6 39. Ne2 Bg4 40. Qe3 Rb2 41. Nc3 Rxf2 42. Qxf2 Qf7 43. Qa2 Nb4 44. Qa8+ Qf8 45. Qb7 Nh5 46. Nd5 Nxd5 47. Qxd5+ Kh8 48. Qb7 Nf6 49. Bxf6+ Qxf6 50. Qb2 Kg7 51. Qd2 h6 52. Kg1 Qd8 53. Kf2 Qb6 54. Bf3 Be6 55. Bd1 Qb1 56. Bf3 Qa1 57. Kg2 Qd4 58. Qe2 Qc3 59. Bg4 1/2-1/2