[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.31"]
[Round "15"]
[White "Keres, Paul"]
[Black "Donner, Jan Hein"]
[Result "1-0"]
1. e4 c6 2. Nc3 d5 3. Nf3 g6 4. d4 Bg7 5. h3 dxe4 6. Nxe4 Nd7 7. Bc4 Ngf6 8. Qe2 Nxe4 9.
Qxe4 Nb6 10. Bb3 a5 11. a4 Bf5 12. Qh4 Qd7 13. O-O Nd5 14. Re1 h6 15. Bd2 g5 16. Qg3 Qc7
17. Ne5 e6 18. Qf3 O-O-O 19. g4 Bxe5 20. Rxe5 Bg6 21. c4 Nb4 22. Bc3 Rhe8 23. Rd1 Re7 24.
Qe2 Red7 25. Re3 b6 26. Re5 Kb7 27. Bxb4 axb4 28. d5 exd5 29. cxd5 cxd5 30. Rdxd5 Rxd5 31.
Bxd5+ Ka7 32. Bf3 Bd3 33. Qe3 Ba6 34. a5 Rd7 35. Rf5 Bc4 36. axb6+ Qxb6 37. Ra5+ Ba6 38.
Be2 Qxe3 39. Rxa6+ Kb7 40. fxe3 Rd2 41. Bf1 Rxb2 42. Rxh6 Rc2 43. Rf6 b3 44. Bd3 Rc3 45.
Be4+ Kc8 46. Rc6+ 1-0