[Event "Interzonal-06"]
[Site "Amsterdam"]
[Date "1964.06.16"]
[Round "20"]
[White "Darga, Klaus"]
[Black "Tringov, Georgi Petrov"]
[Result "1/2-1/2"]

1. Nf3 c5 2. c4 Nc6 3. Nc3 Nf6 4. e3 e6 5. d4 d5 6. cxd5 exd5 7. Be2 a6 8. O-O Bd6 9. dxc5 Bxc5 10. b3 O-O 11. Bb2 Be6 12. Rc1 Qe7 13. Na4 Bd6 14. Nd4 Ne5 15. f4 Neg4 16. Qd3 Rae8 17. h3 Nh6 18. Bf3 Ba3 19. Rc7 Qxc7 20. Bxa3 Bd7 21. Rc1 Qa5 22. Bxf8 Kxf8 23. Nc5 Bc8 24. a4 Qd8 25. b4 Qe7 26. a5 Nf5 27. Re1 Nd6 28. Re2 g6 29. Qc3 Kg8 30. Qd3 Kg7 1/2-1/2