Event: Rapidplay

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Opponent Rating Result
Jeff (Tsun Man) Leung 109 ½ - ½
Jeremy Amos 130 0 - 1
Jeremy Amos 130 0 - 1
Jeff (Tsun Man) Leung 109 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

20 = (478 + 400 * (1 - 2)) / 4)

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