Event: Lytham Summer Tournament

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Opponent Rating Result
John G Cooper 165 0 - 1
John Cox 85 1 - 0
Robert Tinton 125 ½ - ½
David E Aspinall 139 0 - 1
Colin Wilks 102 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

123 = (616 + 400 * (2 - 2)) / 5)

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