Event: u1850 County Championship

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Opponent Rating Result
Jose Serrano 1692 ½ - ½
John R Wickham 1681 ½ - ½
Richard McMorran 1688 ½ - ½
Louis Cowell 1627 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1572 = (6688 + 400 * (0 - 1)) / 4)

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