[Event "IBM"]
[Site "Amsterdam"]
[Date "1974.07.16"]
[Round "1"]
[White "Ivkov, Borislav"]
[Black "Knaak, Rainer"]
[Result "1-0"]

1. e4 Nc6 2. Nf3 d6 3. d4 Bg4 4. c3 Nf6 5. Bb5 a6 6. Ba4 b5 7. Bc2 e5 8. d5 Na5 9. Nbd2 c5 10. b3 g6 11. h3 Bd7 12. a4 Nh5 13. b4 Nb7 14. O-O Nf4 15. Kh2 cxb4 16. cxb4 Rc8 17. axb5 axb5 18. Nb3 Bg7 19. Be3 O-O 20. Qd2 g5 21. Ra7 Rb8 22. Ng1 g4 23. g3 Nxh3 24. Nxh3 gxh3 25. Bd3 Qf6 26. Qe2 Qg6 27. Na5 Nxa5 28. bxa5 Bc8 29. a6 h5 30. Rc1 h4 31. Rg1 Qh7 32. Bxb5 Qxe4 33. Qd3 Qxd3 34. Bxd3 f5 35. gxh4 Rf7 36. Rxf7 Kxf7 37. a7 Ra8 38. Bb5 Bb7 39. Bc6 Bxc6 40. dxc6 d5 41. Bc5 1-0