Event: Tonbridge

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Opponent Rating Result
Harry Homersham 1474 1 - 0
Ryan Martin 1645 0 - 1
Orhan Ozgur 1464 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1394 = (4583 + 400 * (1 - 2)) / 3)

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