Event: Summer League

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Opponent Rating Result
Jim Beaty 2055 ½ - ½
Ian Webster 1445 1 - 0
Jim Beaty 2055 0 - 1
Ian Webster 1445 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1850 = (7000 + 400 * (2 - 1)) / 4)

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