[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1975.01.27"]
[Round "11"]
[White "Portisch, Lajos"]
[Black "Kavalek, Lubomir"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 c6 6. Be3 a6 7. Bd3 b5 8. e5 Nfd7 9. f4 O-O 10. Nf3 Nb6 11. b3 N8d7 12. a4 bxc4 13. bxc4 c5 14. a5 cxd4 15. Nxd4 dxe5 16. Nc6 Qe8 17. axb6 exf4 18. Nd5 fxe3 19. Nc7 Bc3+ 20. Kf1 Bb7 21. Nxe8 Bxc6 22. Nc7 Rad8 23. Rc1 Bd2 24. Nd5 Bxd5 25. cxd5 Nxb6 26. Rc5 Nxd5 27. g3 Rd6 28. Kg2 Rfd8 29. Rxd5 Rxd5 30. Bc4 Rf5 31. Qb3 Rf2+ 32. Kh3 Rd6 33. Qb8+ Kg7 34. Qa7 g5 35. Qxe7 g4+ 36. Kxg4 Rg6+ 37. Kh3 Rh6+ 38. Kg4 Rg6+ 1/2-1/2