Event: Rapidplay - Under 7000

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Opponent Rating Result
Trefor F Thynne 1880 ½ - ½
Trefor F Thynne 1880 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1680 = (3760 + 400 * (0 - 1)) / 2)

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