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Event: Average under 1800

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Opponent Rating Result
John A Feavyour 1400 0 - 1
David McNish 1775 1 - 0
Stephen Livermore 1500 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1558 = (4675 + 400 * (1 - 1)) / 3)

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