Event: Rapidplay league

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Opponent Rating Result
Brian GE Gosling 154 1 - 0
Kevin J Hurst 173 1 - 0
Brian GE Gosling 154 1 - 0
Kevin J Hurst 173 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

564 = (654 + 400 * (4 - 0)) / 4)

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