Event: Durham League Division 1

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Opponent Rating Result
Robin J Nandi 0 1 - 0
Charlie Hazlerigg 0 1 - 0
Vaughan Davison 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

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

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