Event: Doncaster League

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Opponent Rating Result
Andrew Staines 1299 1 - 0
Neil Todd 1759 0 - 1
John E Beech 1625 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1428 = (4683 + 400 * (1 - 2)) / 3)

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