[Event "American op"]
[Site "Los Angeles"]
[Date "1989.??.??"]
[Round "4"]
[White "Christiansen, Larry Mark"]
[Black "Donaldson, John W"]
[Result "1-0"]
[WhiteElo "2530"]
[BlackElo "2395"]

1. c4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nc6 5. e4 Nf6 6. Nc3 d6 7. Be2 Nxd4 8. Qxd4 Bg7 9. Bg5 O-O 10. Qe3 Be6 11. O-O Qb6 12. Qxb6 axb6 13. b3 Nd7 14. Rfc1 Rfe8 15. Bd2 Nc5 16. f3 Rec8 17. Kf1 b5 18. cxb5 Bxb3 19. axb3 Rxa1 20. Rxa1 Bxc3 21. Bxc3 Nxb3 22. Ra3 Rxc3 23. Kf2 1-0