Event: Division 1

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Opponent Rating Result
Mike Roberts 2123 0 - 1
Philip AA Tozer 2114 1 - 0
Tim M Joslin 1809 1 - 0
Thomas B Bonn 2239 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2171 = (8285 + 400 * (2 - 1)) / 4)

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