Event: u1850 County Championship

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Opponent Rating Result
David E McLean 1791 0 - 1
Andrew Maclaren 1818 0 - 1
Graeme Jones 1722 ½ - ½
Jim McAvoy 1833 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1691 = (7164 + 400 * (1 - 2)) / 4)

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