Event: Open County Championship

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Opponent Rating Result
Thomas Sheat 1797 0 - 1
Thomas Sheat 1797 ½ - ½
Jonathan L Collins 1929 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1708 = (5523 + 400 * (0 - 1)) / 3)

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