Event: Division 2

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Opponent Rating Result
Miguel Espinosa 1720 ½ - ½
Peter Marks 1707 0 - 1
Frederick Magee 1814 0 - 1
Frederick Magee 1752 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1648 = (6993 + 400 * (1 - 2)) / 4)

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