[Event "IBM"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "13"]
[White "Donner, Jan Hein"]
[Black "Ree, Hans"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Qa4+ Bd7 6. Qb3 dxc4 7. Qxc4 O-O 8. e4 Bg4 9. Be3 Nfd7 10. Rd1 Nc6 11. Be2 Bxf3 12. gxf3 Nb6 13. Qc5 Qc8 14. f4 Qh3 15. d5 Nb8 16. Qxe7 N8d7 17. Qg5 Bxc3+ 18. bxc3 Rae8 19. Bf1 h6 20. Qxg6+ fxg6 21. Bxh3 Rxe4 22. Be6+ Kh7 23. Kf1 Nf6 24. f5 g5 25. d6 Rd8 26. Bxb6 axb6 27. h4 Kg7 28. dxc7 Rxd1+ 29. Kg2 Rg4+ 30. Kf3 Rd3+ 31. Ke2 Rxc3 32. c8=Q Re4+ 33. Kd2 Rxc8 34. Bxc8 Rxh4 35. Rxh4 1/2-1/2