Event: Atkinson Cup

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Opponent Rating Result
Michael C Hackett 1634 ½ - ½
Sebastian Dworniak 1529 1 - 0
Andrew Donegan 1415 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1526 = (4578 + 400 * (1 - 1)) / 3)

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