Event: Essex Summer Rapid Plate

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Opponent Rating Result
Neville H Twitchell 1863 ½ - ½
Neville H Twitchell 1863 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1863 = (3726 + 400 * (0 - 0)) / 2)

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