Event: Doncaster League

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Opponent Rating Result
Peter M Tate 1574 ½ - ½
Phillip J Battye 1674 1 - 0
Phillip J Battye 1683 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1910 = (4931 + 400 * (2 - 0)) / 3)

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