[Event "Hoogovens"]
[Site "Wijk aan Zee"]
[Date "1971.01.18"]
[Round "6"]
[White "Ivkov, Borislav"]
[Black "Langeweg, Kick"]
[Result "1/2-1/2"]

1. c4 Nf6 2. Nf3 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3 6. Qxc3 d6 7. b4 e5 8. Bb2 b6 9. e3 c5 10. Be2 Bb7 11. O-O Nbd7 12. d3 Rc8 13. a4 Re8 14. e4 cxb4 15. Qxb4 a5 16. Qa3 Nc5 17. Nd2 Bc6 18. Bd1 Nfd7 19. f4 exf4 20. Rxf4 Qg5 21. Rf2 Ne5 22. Bc2 Ng4 23. Nf3 Qh5 24. Qc3 f6 25. Rd2 Re7 26. h3 Ne3 27. Nd4 Bd7 28. Nb5 Bxb5 29. axb5 f5 30. exf5 Nxc2 31. Qxc2 Qxf5 32. Rf1 Qg6 33. Rf3 Rce8 34. Rdf2 Re3 35. Bd4 Rxd3 36. Rxd3 Qxd3 37. Qxd3 Nxd3 38. Rd2 Nc5 39. Bf2 Rd8 40. Bxc5 bxc5 1/2-1/2