[Event "Keres Memorial-02"]
[Site "Tallinn"]
[Date "1979.03.01"]
[Round "7"]
[White "Christiansen, Larry Mark"]
[Black "Hartston, William R"]
[Result "1/2-1/2"]
[WhiteElo "2475"]
[BlackElo "2485"]

1. Nf3 Nf6 2. c4 c5 3. Nc3 e6 4. e3 d5 5. d4 Nc6 6. a3 a6 7. dxc5 Bxc5 8. b4 Ba7 9. Bb2 O-O 10. Qc2 d4 11. exd4 Nxd4 12. Nxd4 Bxd4 13. Be2 e5 1/2-1/2