Event: Div 2

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Opponent Rating Result
Paul Williams 140 1 - 0
Andrew Townsend 0 1 - 0
Alex Webster 160 1 - 0
Peter M Collins 158 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

415 = (458 + 400 * (3 - 0)) / 4)

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