[Event "Olympiad-22"]
[Site "Haifa"]
[Date "1976.10.28"]
[Round "4(1)"]
[White "Castro Rojas, Oscar Humberto"]
[Black "Ostos, Julio Eduardo"]
[Result "1/2-1/2"]
[WhiteElo "2380"]
[BlackElo "2255"]

1. e4 e6 2. d3 d5 3. Nd2 Nf6 4. Ngf3 Nc6 5. c3 a5 6. e5 Nd7 7. d4 f6 8. Bb5 Be7 9. exf6 Bxf6 10. O-O O-O 11. Re1 Re8 12. Nf1 Nf8 13. Bf4 Bd7 14. Bd3 Re7 15. Ne3 Be8 16. Ng4 Bh5 17. h3 Bg6 18. a4 Bxd3 19. Qxd3 Qe8 20. Bg5 Bxg5 21. Nxg5 Qh5 22. Qd2 h6 23. Nf3 Ng6 24. Nfe5 Ncxe5 25. Nxe5 Rf8 26. Nd3 Rf6 27. Re3 Nf8 28. Rae1 b6 29. Re5 Qe8 30. Nf4 Rxf4 31. Qxf4 Ng6 32. Qg4 Nxe5 33. Rxe5 Qxa4 34. Rxe6 Qd7 35. Rxe7 Qxe7 36. Qc8+ Kh7 37. Qf5+ Kh8 38. Qxd5 Qe1+ 39. Kh2 Qxf2 40. Qd8+ Kh7 41. Qxc7 Qxb2 42. d5 Qd2 43. Qe5 a4 44. Qf5+ Kg8 45. Qe6+ Kh7 46. Qf5+ 1/2-1/2