Event: A Division

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Opponent Rating Result
Ethan Norris 2249 ½ - ½
Philip Adams 2016 0 - 1
Michael P Crowther 1854 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2040 = (6119 + 400 * (1 - 1)) / 3)

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