Event: Norfolk County Chess Championships- Challengers

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Opponent Rating Result
Colin R Payne 1593 0 - 1
Diana Vallverdu 1300 1 - 0
David C May 1567 0 - 1
David P Jones 1356 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1454 = (5816 + 400 * (2 - 2)) / 4)

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