Event: Rapidplay league

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Opponent Rating Result
Steve K Dean 161 0 - 1
Anna McLoughlin 50 1 - 0
Steve K Dean 161 0 - 1
Anna McLoughlin 50 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

106 = (422 + 400 * (2 - 2)) / 4)

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