Event: Mini League

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Opponent Rating Result
Keith J Riach 1690 ½ - ½
John Grasham 1631 1 - 0
Pietro Convalle 1458 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1593 = (4779 + 400 * (1 - 1)) / 3)

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