Event: Hepolite (Rapidplay)

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Opponent Rating Result
Paul Butterworth 1866 0 - 1
Paul Butterworth 1866 0 - 1
Sarah Pearson 1428 0 - 1
Sarah Pearson 1428 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1447 = (6588 + 400 * (1 - 3)) / 4)

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