[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.07.26"]
[Round "3"]
[White "Portisch, Lajos"]
[Black "Geller, Efim P"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. Be3 Ng4 8. Bg5 f6 9. Bh4 Nc6 10. d5 Ne7 11. Nd2 Nh6 12. g4 Nf7 13. Qc2 c5 14. f3 Bd7 15. Bd3 Nc8 16. Bf2 Bh6 17. h4 Bf4 18. Nf1 a6 19. a4 Qa5 20. Ra3 Ne7 21. Kd1 Kg7 22. Ng3 Rfb8 23. Nge2 1/2-1/2