[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1971.01.25"]
[Round "11"]
[White "Najdorf, Miguel"]
[Black "Donner, Jan Hein"]
[Result "1/2-1/2"]
1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Ne2 Ba6 6. Ng3 Bxc3+ 7. bxc3 d5 8. Ba3 dxc4 9. e4 Qd7 10. Be2 Nc6 11. O-O O-O-O 12. Qc2 h5 13. Rfd1 h4 14. Nf1 Na5 15. Bb4 Qc6 16. f3 Nh5 17. Ne3 Nf4 18. Bf1 Rh5 19. Qd2 Nd3 20. d5 Qa4 21. Kh1 Nb7 22. Bxd3 cxd3 23. c4 c5 24. dxc6 Qxc6 25. Qc3 h3 26. g4 Rhh8 27. Rxd3 Rxd3 28. Qxd3 Rd8 29. Qa3 Bxc4 30. Rc1 Kb8 31. Be1 b5 32. Nxc4 bxc4 33. Bg3+ Ka8 34. Bf2 a6 35. Qe3 Kb8 36. Qf4+ Ka8 37. Qe3 Kb8 38. Qf4+ Kc8 39. Qxf7 c3 40. Kg1 c2 41. Be3 Rd1+ 42. Kf2 Rxc1 43. Bxc1 Qc5+ 44. Ke2 Nd8 45. Qxg7 e5 46. Qf6 Nc6 47. Qe6+ Kc7 48. Qf7+ Kb6 49. Qb3+ Kc7 50. Qf7+ Kb6 51. Qb3+ 1/2-1/2