[Event "Las Palmas-05"]
[Site "Las Palmas"]
[Date "1976.??.??"]
[Round "11"]
[White "Byrne, Robert Eugene"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]
[WhiteElo "2540"]
[BlackElo "2625"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. O-O Be6 9. f4 Qc7 10. a4 Nbd7 11. Kh1 O-O 12. Be3 exf4 13. Rxf4 Ne5 14. Nd4 Rac8 15. Nf5 Bxf5 16. exf5 d5 17. Nxd5 Nxd5 18. Qxd5 Rfd8 19. Qe4 Re8 20. Rf2 Qxc2 21. Qxb7 Nd3 22. Bxd3 Qxd3 23. Bf4 Bf6 24. h3 Rc4 25. Rf3 Qxf5 26. Bd2 Qc8 27. Qb3 Rc6 28. Bc3 1/2-1/2