Event: Lytham Club Championship

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Opponent Rating Result
Peter A Wilson 145 0 - 1
Simon Dale 0 0 - 1
Yvonne S Taylor 41 1 - 0
Patrick N Coleman 104 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-128 = (290 + 400 * (1 - 3)) / 4)

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