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Event: Average under 1800

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Opponent Rating Result
Michael E Usher 1704 1 - 0
Cormac O'Caolaidhe 1556 0 - 1
Keith Bradley 1400 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1687 = (4660 + 400 * (2 - 1)) / 3)

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