Event: Tonbridge

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Opponent Rating Result
Stakhey Sedykh 1775 0 - 1
Alida Chan 1206 1 - 0
Harry Homersham 1474 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1485 = (4455 + 400 * (1 - 1)) / 3)

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