Event: Division 1

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Opponent Rating Result
Barry Jones 164 0 - 1
Glyn D Valentine 143 1 - 0
Stephen J Emmerton 127 1 - 0
Karol Grzybowski 146 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

345 = (580 + 400 * (3 - 1)) / 4)

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