Event: Division 1

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Opponent Rating Result
Karol Grzybowski 146 ½ - ½
John M Turner 176 1 - 0
Simon Layhe 134 ½ - ½
Samuel A Parry 152 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

152 = (608 + 400 * (1 - 1)) / 4)

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