Event: Essex Summer Rapid Knockout

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Opponent Rating Result
David Spearman 2110 1 - 0
David Spearman 2110 0 - 1
David Kraszewski 1964 0 - 1
David Kraszewski 1964 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2037 = (8148 + 400 * (2 - 2)) / 4)

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