Event: Derby & District Cup QP

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Opponent Rating Result
John C Tompson 0 1 - 0
Andrew Robins 0 1 - 0
Edward T Bromilow 0 1 - 0
John M Potter 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

200 = (0 + 400 * (3 - 1)) / 4)

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