Event: Division A

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Opponent Rating Result
Malcolm R Peacock 2054 0 - 1
Jakub Sosinski 1815 ½ - ½
David A Phillips 2065 0 - 1
Colin M Walker 1825 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1640 = (7759 + 400 * (0 - 3)) / 4)

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