Event: Library Rapidplay May

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Opponent Rating Result
Sam Stevenson 1173 0 - 1
James Reidy 0 0 - 1
Clair Hartill 0 0 - 1
Jack Butterworth 744 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

279 = (1917 + 400 * (1 - 3)) / 4)

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