Event: D&DCL Div 1

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Opponent Rating Result
Andrew J Mort 163 ½ - ½
Norman J Davies 122 0 - 1
Steve B Housley 145 0 - 1
Peter M Collins 144 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-57 = (574 + 400 * (0 - 2)) / 4)

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