Event: Div 2 - Weston Trophy

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Opponent Rating Result
Peter Cooper 1587 ½ - ½
Oliver Graham 1842 0 - 1
Barry Williams 1650 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1693 = (5079 + 400 * (1 - 1)) / 3)

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