[Event "Interzonal-06"]
[Site "Amsterdam"]
[Date "1964.06.10"]
[Round "16"]
[White "Ivkov, Borislav"]
[Black "Tringov, Georgi Petrov"]
[Result "1/2-1/2"]

1. c4 c5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. b3 e6 6. Bb2 Nge7 7. Nf3 O-O 8. O-O d5 9. e3 dxc4 10. bxc4 Qd3 11. Qa4 Bd7 12. Rfc1 Rfd8 13. Bf1 Qf5 14. Nh4 Qe5 15. Qa3 b6 16. Rab1 Be8 17. Rd1 Qb8 18. Ne4 e5 19. Ba1 Qc7 20. Nc3 Nb4 21. Qb3 Bc6 22. d3 Qb7 23. a3 Na6 24. Bg2 Bxg2 25. Nxg2 Nc7 26. e4 Ne6 27. Nd5 Nc6 28. a4 Ned4 29. Bxd4 Nxd4 30. Qa2 Qd7 31. Ne1 f5 32. exf5 gxf5 33. f3 Re8 34. a5 bxa5 35. Qg2 Rab8 36. Nc2 Nc6 37. Qh3 Qf7 1/2-1/2