Event: Doncaster League

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Opponent Rating Result
John E Beech 1635 1 - 0
Rico-Bradley Ellis 1705 ½ - ½
Andrew Staines 1287 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1809 = (4627 + 400 * (2 - 0)) / 3)

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