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Event: Average under 1800

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Opponent Rating Result
George Ward 1736 1 - 0
Stephen Livermore 1500 0 - 1
Michael E Usher 1709 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1782 = (4945 + 400 * (2 - 1)) / 3)

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