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Event: Average under 1800

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Opponent Rating Result
Chris J Russell 1400 1 - 0(def)
Stephen Livermore 1500 0 - 1
Andrew J Chapman 1400 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1050 = (2900 + 400 * (0 - 2)) / 2)

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