Event: u1850 County Championship

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Opponent Rating Result
Tom Woodhouse 1703 1 - 0
Graham K Blowers 1732 0 - 1
Jim McAvoy 1833 1 - 0
John Greiller 1666 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1734 = (6934 + 400 * (2 - 2)) / 4)

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