Event: Reigate

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Opponent Rating Result
Rupert Marsden 1813 0 - 1
Matthew Chatfield 1408 0 - 1
Oscar Tong 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

674 = (3221 + 400 * (0 - 3)) / 3)

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