Event: Division One

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Opponent Rating Result
Daniel M Lambourne 181 0 - 1
Adam Szelc 181 ½ - ½
Emil Angelov 190 1 - 0
Jonathan E Swindells 211 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

191 = (763 + 400 * (1 - 1)) / 4)

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