Event: Division One

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Opponent Rating Result
Kevin Hurney 175 0(def) - 1
Paul Roper 157 0 - 1
Dustin Bowcott 160 ½ - ½
Richard W Smith 153 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

157 = (470 + 400 * (1 - 1)) / 3)

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