Event: Doncaster League

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Opponent Rating Result
Richard F Hall 1732 ½ - ½
Rico-Bradley Ellis 1725 0 - 1
Neil Todd 1749 0 - 1
Alan J Smith 1605 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1603 = (6811 + 400 * (1 - 2)) / 4)

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