Event: u1850 County Championship

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Opponent Rating Result
Ander Movilla Miangolarra 1774 0 - 1
Harry Hartshorn 1504 1 - 0
Thomas Holmes 1354 ½ - ½
Andrew Duffell 1581 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1453 = (6213 + 400 * (1 - 2)) / 4)

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