[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.17"]
[Round "17"]
[White "Geller, Efim P"]
[Black "Panno, Oscar"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Nc6 7. Be3 Be7 8. O-O Bd7 9. Nb3 a6 10. a4 Na5 11. Nxa5 Qxa5 12. Qd2 1/2-1/2