Event: Open County Championship

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Opponent Rating Result
David J Spence 2240 ½ - ½
Eoin Tweeddale 2122 1 - 0
Gary Kenworthy 2169 ½ - ½
Martin G Walker 2180 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2278 = (8711 + 400 * (1 - 0)) / 4)

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