Event: Derby & District Plate QP

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Opponent Rating Result
David Matthews 0 0 - 1
Stephen N Shields 0 ½ - ½
Craig Fores 0 0 - 1
Matthew H. Benfield 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-300 = (0 + 400 * (0 - 3)) / 4)

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