Event: Division 1

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Opponent Rating Result
John M Turner 176 ½ - ½
Simon R Edwards 173 0 - 1
Roger J Edwards 123 1 - 0
Douglas J Barnett 136 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

252 = (608 + 400 * (2 - 1)) / 4)

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