Event: Doncaster League

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Opponent Rating Result
Ismet Berisha 1679 0 - 1
Daniel Wilson 1486 0 - 1
Steven R Brooks 1554 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1306 = (4719 + 400 * (0 - 2)) / 3)

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