Event: Tonbridge league

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Opponent Rating Result
Yury Balabin 0 1 - 0
Toby Barton 63 1 - 0
Liam Turner 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

421 = (63 + 400 * (3 - 0)) / 3)

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