[Event "Budapest Maroczy Memorial"]
[Site "Budapest"]
[Date "1961.10.??"]
[Round "?"]
[White "Donner, Jan Hein"]
[Black "Portisch, Lajos"]
[Result "0-1"]

1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 d6 6. e4 g6 7. Nf3 Bg7 8. Be2 O-O 9. O-O a6 10. a4 Bg4 11. Nd2 Bxe2 12. Qxe2 Nbd7 13. Nc4 Nb6 14. Ne3 Qc7 15. a5 Nbd7 16. Nc4 b5 17. axb6 Nxb6 18. Na5 Rfe8 19. Qc2 Nc8 20. f3 Nd7 21. Bd2 Na7 22. Ra2 Nb5 23. Nxb5 axb5 24. Rfa1 c4 25. Be3 Ne5 26. Qd2 Ra6 27. f4 Nd3 28. Nc6 Rxc6 29. Ra8 Qd7 30. dxc6 Qxc6 31. Rxe8+ Qxe8 32. e5 dxe5 33. fxe5 Bxe5 34. Qa5 Bxb2 35. Qa8 Qxa8 36. Rxa8+ Kg7 37. Kf1 Be5 38. h3 b4 39. Ke2 b3 40. Ra5 b2 41. Rb5 Bc3 42. Bd2 Nc1+ 0-1