Event: Doncaster League

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Opponent Rating Result
Rico-Bradley Ellis 1764 1 - 0
Martin J Sheard 1887 0 - 1
Alan Bramall 1805 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1685 = (5456 + 400 * (1 - 2)) / 3)

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