Event: Derby & District Plate QP

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Opponent Rating Result
Jon Jenson 0 0 - 1
Ian R Morrell 0 ½ - ½
Keith Walsh 0 ½ - ½
Norman J Davies 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

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

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