Event: u1850 County Championship

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Opponent Rating Result
James Irwin 1768 0 - 1
Armando Galletti 1756 1 - 0
Andrew Roderick 1826 0 - 1
Steve Lovell 1836 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1797 = (7186 + 400 * (2 - 2)) / 4)

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