[Event "Las Palmas-03"]
[Site "Las Palmas"]
[Date "1974.??.??"]
[Round "6"]
[White "Hartston, William R"]
[Black "Ribli, Zoltan"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f4 e6 7. Be3 Be7 8. Be2 a6 9. O-O Qc7 10. Qe1 O-O 11. Qg3 Nxd4 12. Bxd4 b5 13. a3 Bb7 14. Bd3 e5 15. fxe5 Nh5 16. Qh3 dxe5 17. Qxh5 exd4 18. Nd5 Bxd5 19. Qxd5 Rad8 20. Qf5 g6 21. Qf3 Bg5 22. a4 Rb8 23. axb5 axb5 24. Ra6 Rfe8 25. Qg4 Re5 26. Kh1 Rbe8 27. Qg3 R8e7 28. Qf2 Qd7 29. Rfa1 Kg7 30. Rb6 R7e6 31. Rxe6 Rxe6 32. Qg3 Bd8 33. Qb8 Rb6 34. Qe5+ Bf6 35. Qc5 Rb7 36. Ra8 Be7 37. Qc8 1/2-1/2