[Event "Interzonal-10a"]
[Site "Biel"]
[Date "1976.08.03"]
[Round "17"]
[White "Castro Rojas, Oscar Humberto"]
[Black "Gulko, Boris F"]
[Result "0-1"]
[WhiteElo "2380"]
[BlackElo "2530"]

1. e4 e6 2. d3 c5 3. Nf3 Nc6 4. g3 g6 5. Bg2 Bg7 6. O-O Nge7 7. Re1 d6 8. c3 e5 9. Be3 O-O 10. d4 exd4 11. cxd4 d5 12. exd5 Nxd5 13. Bg5 Qb6 14. Nc3 Nxc3 15. bxc3 cxd4 16. Rb1 Qa5 17. cxd4 Nxd4 18. Bd2 Qxa2 19. Bb4 Rd8 20. Be7 Bg4 21. Bxd8 Rxd8 22. Kh1 Qa5 23. Qd2 Qxd2 24. Nxd2 Nc2 25. Re7 Rxd2 26. h3 Bf8 27. Rexb7 Be6 28. Rxa7 Rxf2 29. Rb2 Re2 0-1