Event: Division 1

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Opponent Rating Result
Chris P Hankey 155 ½ - ½
Stephen J Emmerton 127 0 - 1
John M Turner 176 0 - 1
Jon EW Blackburn 144 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

51 = (602 + 400 * (1 - 2)) / 4)

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