Event: C Division

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Opponent Rating Result
Robert Donner 1649 ½ - ½
James Urwin 1572 0 - 1
Ammar Alghasra 1500 1 - 0
Rhys Orton 1500 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1555 = (6221 + 400 * (1 - 1)) / 4)

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