Event: u1850 County Championship

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Opponent Rating Result
Colin R Payne 1657 0 - 1
Edward Knox 1688 1 - 0
Michelle Ngo Yu Chan 1726 ½ - ½
Ben Yelverton 1684 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1789 = (6755 + 400 * (2 - 1)) / 4)

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