Event: Folkestone Club Championship

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Opponent	Rating	Result
Chris Cummins	1163	1 - 0
John B Atherton	1949	0 - 1
Robert Twigg	1423	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1378 = (4535 + 400 * (1 - 2)) / 3)