Event: Division One

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Opponent Rating Result
Derek Laight 160 ½ - ½
John Smith 154 ½ - ½
Christopher J Bellin 168 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

27 = (482 + 400 * (0 - 1)) / 3)

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Opponent Rating Result
Harry Evans 115 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

115 = (115 + 400 * (0 - 0)) / 1)