Event: Division 4

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Opponent Rating Result
Paul C Stokes 1820 ½ - ½
Tom Balmond 1457 0 - 1
David M Rogers 1719 0 - 1
Andrew M Cuff 1724 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1580 = (6720 + 400 * (1 - 2)) / 4)

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