[Event "Las Palmas-07"]
[Site "Las Palmas"]
[Date "1978.??.??"]
[Round "1"]
[White "Mariotti, Sergio"]
[Black "Stean, Michael F"]
[Result "0-1"]
[WhiteElo "2475"]

1. d4 Nf6 2. Nf3 g6 3. g3 d5 4. Bg2 Bg7 5. c4 dxc4 6. Qa4+ Nfd7 7. O-O Nc6 8. Qxc4 Nb6 9. Qc2 O-O 10. h3 Nxd4 11. Nxd4 Qxd4 12. Qxc7 Nd5 13. Qa5 Be6 14. e4 b6 15. Qd2 Nb4 16. Nc3 Rfd8 17. Qg5 Bc4 18. Be3 Qe5 19. Rfc1 Nd3 20. Rc2 Nxb2 21. Nd5 Bxd5 22. exd5 Nc4 23. Re1 Rac8 24. Qg4 h5 25. Qd1 Nxe3 26. Rxe3 Qd6 27. Rxc8 Rxc8 28. Qa4 a5 29. h4 Bf6 30. Bf3 Kg7 31. Kg2 Rc1 32. Qe4 Qc5 33. Re2 b5 34. Rd2 b4 35. Qe2 a4 36. Qa6 Qc3 37. Re2 b3 38. axb3 axb3 0-1