Event: Division Four

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Opponent Rating Result
Paul J Evans 124 ½ - ½
Mike J Groombridge 131 1 - 0
John Phillips 133 0 - 1
Sam A Bradley 134 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

131 = (522 + 400 * (1 - 1)) / 4)

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