Event: Lytham Club Championship

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Opponent Rating Result
Patrick N Coleman 108 1 - 0
David E Aspinall 139 ½ - ½
John G Cooper 165 0 - 1
Philip N Raynor 142 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

239 = (554 + 400 * (2 - 1)) / 4)

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