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Event: Average under 1800

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Opponent Rating Result
Andrew J Chapman 1400 0 - 1
Rod B Newbery 1773 0 - 1
Paul Hanks 1400 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1258 = (4573 + 400 * (0 - 2)) / 3)

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