[Event "Olympiad-19 Preliminaries A"]
[Site "Siegen"]
[Date "1970.09.07"]
[Round "3"]
[White "Yabra, Frederico"]
[Black "Skalkotas, Nikolaos"]
[Result "1/2-1/2"]

1. Nf3 c5 2. c4 g6 3. Nc3 Bg7 4. g3 Nc6 5. Bg2 e5 6. O-O Nge7 7. d3 O-O 8. Bg5 h6 9. Bd2 d6 10. Rb1 Be6 11. e4 f5 12. Nd5 f4 13. Bc3 g5 14. gxf4 g4 15. Ne1 exf4 16. Bxg7 Kxg7 17. f3 g3 18. hxg3 fxg3 19. f4 Nd4 20. f5 Nxd5 21. cxd5 Bf7 22. f6+ Kh7 23. Nc2 Nxc2 24. Qxc2 Bg6 25. Qc3 Qd7 26. Rf4 Rf7 27. Rbf1 Re8 28. R1f3 Re5 29. Rxg3 Qa4 30. a3 Qd1+ 31. Rf1 Qh5 32. Qd2 Qh4 33. Rh3 Qg5 34. Qxg5 Rxg5 35. Kh2 Rh5 36. b4 b6 37. bxc5 bxc5 38. Rf4 Rg5 39. Bf3 h5 40. Bg2 Rb7 1/2-1/2