Event: Division 1

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Opponent Rating Result
Stephen J Emmerton 127 1 - 0
Hambel M Willow 138 1 - 0
Roger J Edwards 123 1 - 0
Harry Gardiner 131 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

430 = (519 + 400 * (3 - 0)) / 4)

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