Event: Tonbridge

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Opponent Rating Result
Yehen Gangoda Yapa 0 1 - 0
Elena Currah 1611 0 - 1
Preston Choi 1422 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

878 = (3033 + 400 * (1 - 2)) / 3)

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