Event: Club Championship

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Opponent Rating Result
Robert J Arthurton 1586 0 - 1
Roger Clarke 0 0 - 1
Alan Ward 1437 0 - 1
Calvin Roberts 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

556 = (3023 + 400 * (1 - 3)) / 4)

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