Event: u1850 County Championship

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Opponent Rating Result
Ed Kirkham 1741 ½ - ½
Neil Chedd 1675 1 - 0
Biran S Shah 1796 0 - 1
Robert W Stephens 1732 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1636 = (6944 + 400 * (1 - 2)) / 4)

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