Event: u1850 County Championship

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Opponent Rating Result
John WF McAllister 1718 ½ - ½
Stephen Livermore 1659 0 - 1
David Willsher 1775 1 - 0
Ed Kirkham 1748 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1625 = (6900 + 400 * (1 - 2)) / 4)

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