Event: Open County Championship

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Opponent Rating Result
Thomas P O'Brien 2133 0 - 1
Benjamin PQ Collinson 1986 ½ - ½
Jeff R Dawson 1919 0 - 1
Stephen W Ruthen 1898 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1784 = (7936 + 400 * (0 - 2)) / 4)

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