[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.07"]
[Round "11"]
[White "Savon, Vladimir A"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. c4 Nf6 2. Nf3 e6 3. Nc3 d5 4. d4 Be7 5. Bg5 h6 6. Bh4 O-O 7. e3 b6 8. Be2 Bb7 9. O-O Nbd7 10. Rc1 c5 11. Bg3 Ne4 12. Nxe4 dxe4 13. Ne5 Nxe5 14. Bxe5 Bf6 15. Bxf6 Qxf6 1/2-1/2