Event: Doncaster League

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Opponent Rating Result
Ismet Berisha 1725 ½ - ½
Ismet Berisha 1716 ½ - ½
Neil R Lowther 1894 ½ - ½
Peter M Tate 1577 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1828 = (6912 + 400 * (1 - 0)) / 4)

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