Event: Open County Championship

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Opponent Rating Result
Robert R Sanders 2010 ½ - ½
Michael T Botteley 2010 0 - 1
Paul F Habershon 1971 1 - 0
Ken B McEwan 2172 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2141 = (8163 + 400 * (2 - 1)) / 4)

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