Event: u1850 County Championship

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Opponent Rating Result
Paul Walton 1833 0 - 1
Hazel Bowler 1809 1 - 0
Armando Galletti 1756 0 - 1
James A Briginshaw 1754 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1788 = (7152 + 400 * (2 - 2)) / 4)

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