Event: Christmas rapidplay

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Opponent Rating Result
Akshay Mandalia 1153 0 - 1
Lawrence Waller 341 1 - 0
Ananya Patel 1452 0 - 1
Jonathan Rubeck 1796 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

986 = (4742 + 400 * (1 - 3)) / 4)

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