[Event "Las Palmas-07"]
[Site "Las Palmas"]
[Date "1978.??.??"]
[Round "4"]
[White "Mariotti, Sergio"]
[Black "Olafsson, Fridrik"]
[Result "1/2-1/2"]
[WhiteElo "2475"]

1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d3 g6 5. b4 d6 6. g3 Bg7 7. Bg2 O-O 8. O-O h6 9. Re1 Be6 10. Nbd2 Qd7 11. Bb2 Bh3 12. Nh4 Bxg2 13. Kxg2 Nh7 14. Kh1 Ne7 15. d4 f5 16. dxe5 dxe5 17. Qe2 Ng5 18. Nhf3 Nxf3 1/2-1/2