Event: Lytham Club Championship

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Opponent Rating Result
Keith Sansom 91 0 - 1
Patrick N Coleman 104 ½ - ½
Ken Hopwood 56 1 - 0
John Regan 104 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-11 = (355 + 400 * (1 - 2)) / 4)

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