Event: D Division

Opponent Rating Result
Sean M Lightbown 1582 ½ - ½
Nathan Harvey-Jones 1742 1 - 0
Leo Cheung 1583 1 - 0
Karl Moorcroft 1591 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1825 = (6498 + 400 * (2 - 0)) / 4)

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