Event: Division A

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Opponent Rating Result
Rob Gallagher 158 0 - 1
John D Lyth 180 ½ - ½
Oleg Cukovs 171 ½ - ½
Malcolm R Peacock 185 0 - 1
Graham J Ashcroft 161 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

11 = (855 + 400 * (0 - 2)) / 5)

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