Event: Darlington RAPIDPLAY

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Opponent Rating Result
Sam Ball 1438 0 - 1
Kevin J Wilson 1863 1 - 0
Robert Donner 1630 0 - 1
Robert Donner 1630 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1640 = (6561 + 400 * (2 - 2)) / 4)

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