[Event "Olympiad-19 Preliminaries A"]
[Site "Siegen"]
[Date "1970.09.08"]
[Round "4"]
[White "Martelli, Robert"]
[Black "Bellon Lopez, Juan Manuel"]
[Result "0-1"]

1. b3 e5 2. Bb2 Nc6 3. c4 Nf6 4. g3 d5 5. Bg2 Be6 6. Qc2 Nb4 7. Qc1 Bf5 8. Bxe5 Ng4 9. Qc3 f6 10. Bd4 c5 11. Nf3 Nc2+ 12. Kf1 cxd4 13. Nxd4 Bb4 14. Qb2 Qb6 15. f3 Qxd4 16. Qxd4 Nxd4 17. fxg4 Bxg4 18. Nc3 Bxc3 19. dxc3 Nc2 20. Rc1 Ne3+ 21. Kf2 Nxg2 22. Kxg2 dxc4 23. b4 O-O-O 24. h3 Bxe2 25. Rhe1 Rd2 0-1