Event: Doncaster League

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Opponent Rating Result
Martin J Sheard 1863 ½ - ½
Sean O McDonald 1908 1 - 0
Andrew Butterworth 1923 ½ - ½
Sean O McDonald 1898 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1898 = (7592 + 400 * (1 - 1)) / 4)

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