Event: Internal Rapidplay January

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Opponent Rating Result
Geoff Mann 1409 1 - 0
Richard Stevenson 1079 1 - 0
Sam Stevenson 1075 1 - 0
Francis Batchelor 1921 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1571 = (5484 + 400 * (3 - 1)) / 4)

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