Event: Challengers - U1900

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Opponent Rating Result
Ben W Vaughan 1633 ½ - ½
Brian A Foreman 1699 0 - 1
Rob Mitchell 1706 ½ - ½
Joshua Cherrington 1629 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1567 = (6667 + 400 * (0 - 1)) / 4)

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