[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1964.01.23"]
[Round "13"]
[White "Donner, Jan Hein"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 c5 3. d5 d6 4. Nc3 g6 5. e4 Bg7 6. Be2 O-O 7. Nf3 e5 8. O-O Ng4 9. Ng5 Nf6 10. f4 exf4 11. Bxf4 Ne8 12. Qd2 Nd7 13. Rae1 Qe7 14. Nd1 a6 15. b3 Nc7 16. Nf2 Ne5 17. Nf3 b5 18. Nxe5 Bxe5 19. Bg4 Ne8 20. Bxc8 Rxc8 21. Nd3 Bd4+ 22. Kh1 bxc4 23. bxc4 f6 24. Nb4 cxb4 25. Qxd4 Rf7 26. Bd2 a5 27. a3 Qa7 28. Qd3 Qa6 29. axb4 axb4 30. Bxb4 1/2-1/2