Event: Essex Summer Rapid Knockout

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Opponent Rating Result
Steven Mitchell 2031 1 - 0
Steven Mitchell 2031 ½ - ½
David Kraszewski 1942 0 - 1
David Kraszewski 1942 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1887 = (7946 + 400 * (1 - 2)) / 4)

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