[Event "Interzonal-06"]
[Site "Amsterdam"]
[Date "1964.05.24"]
[Round "4"]
[White "Benko, Pal C"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. cxd5 exd5 6. Bf4 c6 7. Qc2 g6 8. e3 Bf5 9. Bd3 Bxd3 10. Qxd3 O-O 11. O-O Nbd7 12. Rab1 a5 13. Qc2 Re8 14. a3 Nb6 15. Nd2 Nh5 16. Be5 Nd7 17. Nf3 Nb6 18. Nd2 Nd7 19. Rfd1 Bf8 20. Bg3 Nxg3 21. hxg3 Nf6 22. b4 axb4 23. axb4 b5 24. Ne2 Ra6 25. Nf4 Bd6 26. Nd3 Qe7 27. Ra1 Rea8 28. Rxa6 Rxa6 29. Nb3 Bxb4 30. Ra1 Rxa1+ 31. Nxa1 Qa7 32. Nb3 Qa4 33. Ne5 Bd6 34. Qxc6 Qxb3 35. Qxd6 Qd1+ 1/2-1/2