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

1. c4 Nf6 2. Nc3 e6 3. d4 Bb4 4. e3 O-O 5. Nf3 b6 6. Bd3 Bb7 7. O-O Bxc3 8. bxc3 Be4 9. Be2 c5 10. Nd2 Bb7 11. f3 d5 12. Nb3 Qc7 13. dxc5 bxc5 14. cxd5 exd5 15. c4 Re8 16. Qc2 Nbd7 17. cxd5 Nxd5 18. e4 Nb4 19. Qc3 Nd5 20. Qa5 N5b6 21. Be3 c4 22. Rac1 Re5 23. Bxc4 Qd6 24. Rfd1 Rxa5 25. Rxd6 Rxa2 26. Bxb6 Nxb6 27. Bxf7+ Kxf7 28. Rc7+ Kg8 29. Rxb7 Rc8 30. h4 g6 31. Nd4 1-0