[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.07.30"]
[Round "6"]
[White "Biyiasas, Peter"]
[Black "Keres, Paul"]
[Result "1/2-1/2"]
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Qd6 6. d4 exd4 7. Qxd4 Qxd4 8. Nxd4 Bd7 9. Bf4 O-O-O 10. Nc3 Ne7 11. Rad1 Ng6 12. Bg3 Bb4 13. Nf5 h5 14. Nh4 Nxh4 15. Bxh4 Rde8 16. Rfe1 Re5 17. f4 Ra5 18. Rd3 f6 19. a3 Bd6 20. f5 Re8 21. Bg3 Bxg3 22. Rxg3 Re7 23. Rd1 Rae5 24. Kf2 b6 25. Rgd3 a5 26. R1d2 c5 27. Nd5 Rf7 28. Re3 Bc6 29. c4 Rf8 30. Kf3 Be8 31. Kf4 Bf7 32. a4 Rfe8 33. b3 1/2-1/2