[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.07.30"]
[Round "14"]
[White "Donner, Jan Hein"]
[Black "Csom, Istvan"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 c5 6. d5 d6 7. a3 Bxc3+ 8. Nxc3 e5 9. Bd3 Qe7 10. e4 O-O 11. h4 a6 12. f3 Ne8 13. g4 Ra7 14. b4 cxb4 15. axb4 Nc7 16. Be3 Rb7 17. Qd2 Nd7 18. Qf2 a5 19. bxa5 Na6 20. axb6 Ndc5 21. Ke2 Bd7 22. Rhb1 Rfb8 23. Qe1 Rxb6 24. Rxb6 Rxb6 25. Nb5 h6 26. g5 hxg5 27. hxg5 Qe8 28. Qh4 Rxb5 29. cxb5 Bxb5 30. Rh1 Bxd3+ 31. Kf2 Kf8 32. Qh8+ Ke7 33. Qxg7 Bxe4 34. fxe4 Nxe4+ 35. Kf3 Qb5 36. g6 Qxd5 37. Qxf7+ Qxf7+ 38. gxf7 Nf6 39. Ra1 Nc5 40. Ra7+ Ncd7 41. Bg5 Kf8 42. Kg3 Kg7 43. Kh4 Nf8 44. Kh3 Kg6 45. Bh4 N8h7 46. Kg3 Nf8 47. Ra8 N6d7 48. Be7 Kxf7 49. Bxd6 Nh7 1/2-1/2