[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1964.01.15"]
[Round "7"]
[White "Portisch, Lajos"]
[Black "Zuidema, Coen"]
[Result "1-0"]
1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 Bxd2+ 5. Qxd2 b6 6. g3 Ba6 7. Na3 c6 8. Bg2 d6 9. O-O O-O 10. Rfd1 Qe7 11. Rac1 Nbd7 12. Nc2 Rac8 13. Qb4 Bb7 14. Qa3 Rc7 15. Ne5 Ba8 16. Nxd7 Nxd7 17. e4 c5 18. Ne3 g6 19. Qd3 Rd8 20. f4 Rcc8 21. Rc2 cxd4 22. Qxd4 Qf6 23. Rcd2 Kg7 24. Qxd6 Nc5 25. e5 1-0