Event: Major

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Opponent Rating Result
Andrew Beadle 1508 ½ - ½
Tim Wells 1697 0 - 1
Michael Gilyatt 1584 1 - 0
Mark Croasdale 1681 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1518 = (6470 + 400 * (1 - 2)) / 4)

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