Event: Internal Rapidplay January

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Opponent Rating Result
Sam Stevenson 1075 0 - 1
George Butterworth 922 1 - 0
Tristan Green 1381 0 - 1
Richard Stevenson 1079 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

914 = (4457 + 400 * (1 - 3)) / 4)

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