Event: Division 3

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Opponent Rating Result
Robert Ashworth 161 0 - 1
Kevin N Bendall 135 ½ - ½
Robert Ashworth 159 ½ - ½
Geoffrey P Taylor 117 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

143 = (572 + 400 * (1 - 1)) / 4)

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