[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.17"]
[Round "17"]
[White "Gheorghiu, Florin"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 Be7 5. cxd5 exd5 6. Bg5 c6 7. Qc2 g6 8. e3 Bf5 9. Bd3 Bxd3 10. Qxd3 Nbd7 11. O-O O-O 12. Bh6 Re8 13. h3 a5 1/2-1/2