[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1969.01.17"]
[Round "4"]
[White "Portisch, Lajos"]
[Black "Ree, Hans"]
[Result "1-0"]

1. c4 e5 2. Nc3 Nf6 3. g3 Bb4 4. Bg2 O-O 5. e4 Nc6 6. Nge2 d6 7. O-O Bc5 8. h3 Nd4 9. d3 c6 10. Kh1 Ne8 11. Nxd4 Bxd4 12. Ne2 Bb6 13. d4 Qe7 14. Be3 Nf6 15. Qd3 Re8 16. Nc3 Be6 17. a4 exd4 18. Bxd4 Bxd4 19. Qxd4 Nd7 20. Rad1 Nc5 21. b4 Na6 22. b5 Nb4 23. Ne2 a6 24. Nf4 c5 25. Qc3 axb5 26. axb5 Ra2 27. e5 Rc2 28. exd6 Qd7 29. Qf3 Bxc4 30. Rfe1 Bxb5 31. Rxe8+ Qxe8 32. d7 Bxd7 33. Qxb7 Ba4 34. Qb6 Nc6 35. Ra1 h6 36. Rxa4 Qe1+ 37. Kh2 Nd4 38. Ra8+ Kh7 39. Qd8 1-0