Event: Lytham Summer Tournament

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Opponent Rating Result
John G Cooper 165 0 - 1
Colin Wilks 102 0 - 1
Patrick N Coleman 108 0 - 1
John Cox 85 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-85 = (460 + 400 * (1 - 3)) / 4)

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