Event: Tonbridge

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

670 = (1611 + 400 * (2 - 1)) / 3)

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