Event: Winter Online

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Opponent Rating Result
Andrew Cowan 1623 ½ - ½
Andrew Cowan 1623 0 - 1
Ashley Freeman 1700 0 - 1
Ashley Freeman 1700 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1562 = (6646 + 400 * (1 - 2)) / 4)

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