[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1979.03.25"]
[Round "1"]
[White "Diesen, Mark C"]
[Black "Rigo, Janos"]
[Result "1/2-1/2"]
[WhiteElo "2460"]
[BlackElo "2385"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. g3 O-O 5. Bg2 d5 6. Nf3 c5 7. cxd5 cxd4 8. Nxd4 Nxd5 9. Bd2 Nxc3 10. bxc3 Bc5 11. Rb1 e5 12. Nc2 Nc6 13. O-O Qa5 14. Nb4 Bxb4 15. cxb4 Qxa2 16. b5 Nd4 17. e3 Rd8 18. exd4 Rxd4 19. Qh5 Rxd2 20. Qxe5 Qe6 21. Qc7 Qd6 22. Rfe1 Kf8 23. Rbc1 Qxc7 24. Rxc7 Rb8 25. Rec1 Bd7 26. Bxb7 Bxb5 27. Ra1 a5 28. Rxa5 1/2-1/2