Event: u1850 County Championship

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Opponent Rating Result
James Pack 1818 0 - 1
Andrew Maclaren 1755 ½ - ½
Gert De Block 1654 1 - 0
James Irwin 1791 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1855 = (7018 + 400 * (2 - 1)) / 4)

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