Event: Peter Harrison Knockout Cup

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Opponent	Rating	Result
Kevin N Bendall	1616	0 - 1
Steve J Dyer	1674	1 - 0
Tony C Norris	1659	1 - 0

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

1783 = (4949 + 400 * (2 - 1)) / 3)