Event: Rapidplay

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Opponent Rating Result
Aiya Manabayeva 157 0 - 1
Daniel Williamson 150 1 - 0
Daniel Williamson 150 ½ - ½
Aiya Manabayeva 157 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

154 = (614 + 400 * (1 - 1)) / 4)

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