[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.17"]
[Round "5"]
[White "Donner, Jan Hein"]
[Black "Browne, Walter Shawn"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. Nf3 Qa5 8. Nd2 Nbd7 9. g3 g6 10. e4 Bxf1 11. Kxf1 Bg7 12. Nc4 Qb4 13. Qe2 Nb6 14. Nxb6 Qxb6 15. Kg2 O-O 16. Rb1 Rfb8 17. Bd2 Ne8 18. b3 Nc7 19. a4 Rb7 20. Rhc1 Rab8 21. Qd3 Qa7 22. Qc2 Qa6 23. Nd1 Qe2 24. Ne3 Na6 25. Re1 Qh5 26. Nc4 Rf8 27. Na5 Rc7 28. Qc4 Nb8 29. b4 f5 30. f4 fxe4 31. Qxe4 cxb4 32. Rxb4 Na6 33. Rc4 Nc5 34. Qf3 Qxf3+ 35. Kxf3 Rf5 36. Nb3 Rxd5 37. Be3 Rd3 38. Nxc5 Rxc5 39. Rxc5 dxc5 40. Ke4 Ra3 41. Bxc5 Rxa4+ 42. Kf3 1/2-1/2