[Event "Olympiad-18 Preliminaries A"]
[Site "Lugano"]
[Date "1968.10.21"]
[Round "4"]
[White "Kottnauer, Cenek"]
[Black "Durao, Joaquim Manuel"]
[Result "1/2-1/2"]
1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. exf6 gxh4 10. Ne5 Qxf6 11. g3 Nd7 12. Qe2 Bb4 13. Bg2 Bb7 14. O-O Bxc3 15. bxc3 Nxe5 16. dxe5 Qe7 17. a4 a6 18. Rfd1 c5 19. Bxb7 Qxb7 20. Qg4 b4 21. Qxh4 bxc3 22. Qf6 O-O 23. Qxh6 Qf3 24. Qg5+ Kh7 25. Qh4+ Kg7 26. Qxc4 Rfd8 27. Rd6 Rab8 28. Rf1 a5 29. Qh4 Rxd6 30. exd6 c2 31. Qg5+ Kh7 32. Qxc5 Qd1 33. Qc7 1/2-1/2