Event: Lytham Summer Tournament

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Opponent Rating Result
John Cox 85 1 - 0
David E Aspinall 139 1 - 0
Roy Ellames 198 ½ - ½
Robert Tinton 125 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

337 = (547 + 400 * (2 - 0)) / 4)

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