Event: Open County Championship

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Opponent Rating Result
Robert L Jones 1674 1 - 0
Dominic Watson 1684 0 - 1
Stephen W Ruthen 1898 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1619 = (5256 + 400 * (1 - 2)) / 3)

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