[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.12"]
[Round "14"]
[White "Ivkov, Borislav"]
[Black "Keres, Paul"]
[Result "1/2-1/2"]
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. Nxe4 Bxe4 9. Ne1 Bxg2 10. Nxg2 d5 11. Qa4 Qe8 12. Qxe8 Rxe8 13. cxd5 exd5 1/2-1/2