[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1969.02.01"]
[Round "15"]
[White "Portisch, Lajos"]
[Black "Benko, Pal C"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 c5 6. Nf3 d5 7. O-O dxc4 8. Bxc4 Nc6 9. a3 Ba5 10. Qd3 a6 11. Rd1 b5 12. Ba2 Bb7 13. dxc5 Qe7 14. Qc2 Bxc3 15. Qxc3 Ne4 16. Qc2 Nxc5 17. b3 Rfd8 18. Bb2 Rac8 19. h3 h6 20. Rac1 Rxd1+ 21. Rxd1 Nb8 22. Qd2 Ne4 23. Qd4 Qf6 24. Qxf6 gxf6 25. Ne1 Kg7 26. Rd3 Nc6 27. f3 Nc5 28. Rc3 Ne5 29. e4 a5 30. Bb1 b4 31. axb4 axb4 32. Re3 Rd8 33. Bc2 Rd2 34. Bc1 Rd8 35. Bb2 Rd2 1/2-1/2