Event: Division 2

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Opponent Rating Result
Joshua Gittins 145 ½ - ½
Andrew Gibson 135 0 - 1
Alex Hope 119 ½ - ½
Geoffrey P Taylor 116 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

129 = (515 + 400 * (1 - 1)) / 4)

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