[Event "IBM"]
[Site "Amsterdam"]
[Date "1972.??.??"]
[Round "?"]
[White "Ree, Hans"]
[Black "Donner, Jan Hein"]
[Result "1-0"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 e5 7. d5 c6 8. Bd3 cxd5 9. cxd5 Ne8 10. Qd2 Nd7 11. Nge2 Nc5 12. Bc2 a5 13. O-O Bd7 14. b3 b5 15. a3 Na6 16. Bd3 Qb8 17. b4 axb4 18. axb4 Nxb4 19. Rxa8 Qxa8 20. Bxb5 Bxb5 21. Nxb5 Na6 22. Qa5 Qb7 23. Qb6 Qxb6 24. Bxb6 Nb8 25. Bd8 f5 26. Be7 Rf7 27. Bxd6 Rb7 28. Nec3 fxe4 29. fxe4 Nxd6 30. Nxd6 Rb3 31. Ndb5 Rb2 32. Ra1 Bf8 33. Kf1 Nd7 34. Ra7 Nf6 35. d6 Rd2 36. Ke1 Bh6 37. Re7 Kf8 38. Rxe5 Rxg2 39. Nd5 Bg5 40. Nbc7 Bh4+ 41. Kd1 Rxh2 42. Nxf6 Bxf6 43. d7 Kf7 44. Nd5 Rh1+ 45. Ke2 Rh2+ 1-0