Event: Doncaster League

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Opponent Rating Result
John P Mainwaring 1683 0 - 1
Steven R Brooks 1593 ½ - ½
Phillip J Battye 1689 1 - 0
Paul Hagan 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1341 = (4965 + 400 * (2 - 1)) / 4)

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