Event: Division 1

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Opponent Rating Result
Stuart WC Clarke 209 0 - 1
Andrew T Leadbetter 117 1 - 0
Michael L Hancock 169 ½ - ½
Hambel M Willow 136 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

258 = (631 + 400 * (2 - 1)) / 4)

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