[Event "IBM"]
[Site "Amsterdam"]
[Date "1968.??.??"]
[Round "4"]
[White "Marovic, Drazen"]
[Black "Bronstein, David Ionovich"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 d6 6. O-O Nbd7 7. Nc3 e5 8. e4 c6 9. h3 a6 10. Qc2 b6 11. Be3 Qe7 12. Rad1 Bb7 13. Rfe1 Rfe8 14. a3 Rad8 15. b4 exd4 16. Bxd4 c5 17. bxc5 bxc5 18. Nd5 Qf8 19. Bc3 Rb8 20. Nd2 Rec8 21. Rb1 Ne8 22. f4 Bxc3 23. Qxc3 Rd8 24. e5 dxe5 25. fxe5 Qg7 26. Rxb7 Rxb7 27. Ne7+ Kf8 28. Bxb7 Kxe7 29. Qe3 Nc7 30. Qg5+ Ke8 31. Bd5 h6 32. Qf4 Ke7 33. Nf3 g5 34. Qe3 Qg6 35. h4 Rb8 36. hxg5 hxg5 37. Nxg5 Rb1 38. Rxb1 Qxb1+ 39. Kh2 Nxd5 40. cxd5 Qa2+ 41. Kh3 1/2-1/2