Event: Challengers - U1900

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Opponent Rating Result
Rob Mitchell 1715 ½ - ½
Omar Oliveri 1640 1 - 0
Paul Mottram 1747 0 - 1
John K Robinson 1683 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1696 = (6785 + 400 * (1 - 1)) / 4)

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