Event: Internal Rapidplay August

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Opponent Rating Result
George Butterworth 1069 1 - 0
Martin Swales 0 ½ - ½
Ian Swales 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

623 = (1069 + 400 * (2 - 0)) / 3)

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