[Event "IBM"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "4"]
[White "Donner, Jan Hein"]
[Black "Karaklajic, Nikola"]
[Result "1-0"]

1. c4 e6 2. d4 Nf6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O dxc4 8. Bxc4 Nbd7 9. Qe2 b6 10. Rd1 cxd4 11. exd4 Bb7 12. d5 Bxc3 13. dxe6 Bxf3 14. Qxf3 Ne5 15. exf7+ Kh8 16. Rxd8 Nxf3+ 17. gxf3 Rfxd8 18. bxc3 Rd1+ 19. Kg2 Nd7 20. f4 h6 21. Bb2 Rxa1 22. Bxa1 Rd8 23. Bb2 g6 24. Bd5 Kg7 25. c4+ Kf8 26. Kf3 Nc5 27. Ba3 Rd6 28. Bb2 Rd7 29. Ke3 Re7+ 30. Be5 Nd7 31. Kd4 Nxe5 32. fxe5 Rc7 33. e6 Ke7 34. Ke5 Rc8 35. f4 h5 36. h4 Rh8 37. a4 a6 38. Be4 Rc8 39. Bxg6 Rxc4 40. f5 Rc5+ 41. Kf4 Rc8 42. Kg5 Rb8 43. Bxh5 b5 44. Bg4 bxa4 45. f6+ Kf8 46. Kg6 1-0