Event: Open County Championship

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Opponent Rating Result
James Gardner 2088 0 - 1
David J Spence 2234 0 - 1
Chris Davison 2100 ½ - ½
Eoin Tweeddale 2090 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1828 = (8512 + 400 * (0 - 3)) / 4)

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