Event: Peter Harrison Knockout Cup

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Opponent	Rating	Result
Robert Ashworth	1890	1 - 0
David J Horton	1946	0 - 1
David O Vaughan	1819	0 - 1

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

1752 = (5655 + 400 * (1 - 2)) / 3)