[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1969.01.22"]
[Round "6"]
[White "Portisch, Lajos"]
[Black "Van Scheltinga, Theo D"]
[Result "1/2-1/2"]
1. c4 e6 2. g3 d5 3. Bg2 Nf6 4. Nf3 Be7 5. O-O O-O 6. d4 Nbd7 7. Qc2 c6 8. Rd1 b6 9. Bf4 Ba6 10. Ne5 Nxe5 11. dxe5 Nd7 12. cxd5 cxd5 13. e4 d4 14. Rxd4 Bc5 15. Rd1 g5 16. Bc1 Qe7 17. Qa4 Bc8 18. a3 Nxe5 19. b4 Bd6 20. Bxg5 Qxg5 21. Rxd6 Nf3+ 22. Bxf3 Qf6 23. Ra2 Qxf3 24. Nd2 Qe2 25. Rb2 Bb7 26. b5 Rfd8 27. Rxd8+ Rxd8 28. Qb4 h6 29. a4 e5 30. Nf1 Qxe4 31. Qxe4 1/2-1/2