[Event "Interzonal-07"]
[Site "Sousse"]
[Date "1967.10.16"]
[Round "1"]
[White "Byrne, Robert Eugene"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. f4 a6 7. Be3 b5 8. Qf3 Bb7 9. Bd3 Nf6 10. g4 d5 11. e5 Nd7 12. O-O-O Nxd4 13. Bxd4 Bc5 14. Ne2 O-O-O 15. Qe3 f6 16. Rhe1 fxe5 17. fxe5 h6 18. Nf4 Rhe8 19. Bg6 Re7 20. Kb1 Bxd4 21. Rxd4 Nc5 22. c3 Kb8 23. h4 Qb6 24. Nd3 Nxd3 25. Qxd3 Rc8 26. Qe3 Rec7 27. Qf4 Rc4 28. Bd3 Rxd4 29. Qxd4 Qxd4 30. cxd4 Rf8 1/2-1/2