Event: Doncaster League

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Opponent Rating Result
Martin Presley 1620 0 - 1
Daniel Wilson 1512 1 - 0
Anthony Perry 1600 1 - 0
Mick Henshaw 1494 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1557 = (6226 + 400 * (2 - 2)) / 4)

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