[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1968.01.13"]
[Round "4"]
[White "Ree, Hans"]
[Black "Portisch, Lajos"]
[Result "0-1"]

1. e4 c5 2. Nf3 e6 3. d3 d5 4. g3 Nc6 5. Bg2 dxe4 6. dxe4 Qxd1+ 7. Kxd1 b6 8. c3 Ba6 9. Bf1 O-O-O+ 10. Nbd2 Bb7 11. Kc2 Nf6 12. Bd3 h6 13. Re1 g5 14. h3 g4 15. hxg4 Nxg4 16. Rf1 h5 17. a4 Nce5 18. Nxe5 Nxe5 19. Be2 h4 20. g4 h3 21. f3 h2 22. Rh1 Rh3 23. Kb3 Nd3 24. Bxd3 Rxd3 25. Nf1 Rdxf3 26. Rxh2 Rxh2 27. Nxh2 Rf2 0-1