[Event "Zonal Halle"]
[Site "Halle/Saale"]
[Date "1963.??.??"]
[Round "?"]
[White "Portisch, Lajos"]
[Black "Donner, Jan Hein"]
[Result "1-0"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 Be7 5. Bf4 O-O 6. e3 Nbd7 7. c5 Nh5 8. Bd3 g6 9. O-O c6 10. b4 b6 11. Bh6 Re8 12. e4 Qc7 13. Re1 dxe4 14. Bxe4 Nhf6 15. Nb5 Qb7 16. Nd6 Bxd6 17. cxd6 Nxe4 18. Rxe4 c5 19. Rh4 c4 20. Qd2 f6 21. Bg7 Ne5 22. dxe5 Qxg7 23. Rxc4 fxe5 24. Rc7 Bd7 25. Qc3 1-0