[Event "IBM"]
[Site "Amsterdam"]
[Date "1962.08.24"]
[Round "8"]
[White "Donner, Jan Hein"]
[Black "Hartoch, Robert G"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 d6 5. Nf3 O-O 6. O-O Nbd7 7. Nc3 e5 8. e4 c6 9. h3 Qe7 10. Be3 Ne8 11. Re1 f5 12. exf5 gxf5 13. dxe5 dxe5 14. Bg5 Qf7 15. Bf1 h6 16. Bh4 e4 17. Nd2 Ne5 18. Be2 Nf6 19. Kh2 Be6 20. b3 Rad8 21. Qc2 Rd7 22. Rad1 Rfd8 23. Nf1 Nd3 24. Bxd3 Rxd3 25. Ne2 Rxd1 26. Rxd1 Rxd1 27. Qxd1 Qd7 28. Qc2 Nh5 29. Ne3 Qd3 30. Qxd3 exd3 31. Ng1 f4 32. Nd1 fxg3+ 33. Bxg3 Bf5 34. Nf3 b5 35. cxb5 cxb5 36. Bc7 Bf8 37. Ne3 Be4 38. Nd2 Bh7 39. Kg2 Bb4 40. Nef1 Nf6 1/2-1/2