Event: Welcome Back Rapidplay

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Opponent Rating Result
Daniel M Lambourne 2134 0 - 1
Mark Crane 851 1 - 0
Ian A Clack 1562 1 - 0
David Smith 1677 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1556 = (6224 + 400 * (2 - 2)) / 4)

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