Event: Reigate

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Opponent Rating Result
Ben Pollock 1099 0 - 1
Taiyan Lu 1016 0 - 1
Joel Griffiths 724 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

813 = (2839 + 400 * (1 - 2)) / 3)

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