Event: Div 2 - Weston Trophy

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Opponent Rating Result
John Baker 1667 ½ - ½
Mark Watson 1460 1 - 0
Andrew Nettleship 1556 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1694 = (4683 + 400 * (1 - 0)) / 3)

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