Event: Challengers - U1900

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Opponent Rating Result
Graham M Booley 1829 ½ - ½
James T Bingham 1762 ½ - ½
Jack Pilley 1625 0 - 1
John D Manger 1633 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1512 = (6849 + 400 * (0 - 2)) / 4)

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