Event: Division 1

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Opponent Rating Result
Graham Ewens 151 1 - 0
John N Sugden 186 0 - 1
George Neale 153 1 - 0
Laurence A Butt 161 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

363 = (651 + 400 * (3 - 1)) / 4)

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