Event: Essex Summer Rapid Knockout

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Opponent	Rating	Result
Graham J Kershaw	1720	1 - 0
Graham J Kershaw	1720	1 - 0
Arunas Gedvilas	1937	1 - 0
Arunas Gedvilas	1937	1 - 0

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

2229 = (7314 + 400 * (4 - 0)) / 4)