[Event "Olympiad-18 Preliminaries B"]
[Site "Lugano"]
[Date "1968.10.21"]
[Round "4"]
[White "Villarroel, Geber"]
[Black "Brinck Claussen, Bjorn"]
[Result "0-1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 bxc6 5. O-O d6 6. Re1 e5 7. d3 Be7 8. Nbd2 f5 9. c3 Nf6 10. Qb3 fxe4 11. dxe4 Nh5 12. Nc4 Be6 13. Be3 O-O 14. Nfd2 Nf4 15. Qa4 Qe8 16. Rad1 Nd3 17. Nf3 Nxe1 18. Nxe1 Qb8 19. b3 Qb5 20. Nxd6 Qxa4 21. bxa4 Rad8 22. Bxc5 Rd7 23. Nf3 Bg4 0-1