Event: Essex Summer Rapid Knockout

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Opponent Rating Result
Karl Bowden 2272 0 - 1
Karl Bowden 2272 ½ - ½
Jeff A Goldberg 2043 0 - 1
Jeff A Goldberg 2043 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1858 = (8630 + 400 * (0 - 3)) / 4)

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