Event: Essex Summer Rapid Knockout

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Opponent	Rating	Result
Russell P White	2111	½ - ½
Russell P White	2111	1 - 0
Jeff A Goldberg	2118	½ - ½
Jeff A Goldberg	2118	0 - 1

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

2115 = (8458 + 400 * (1 - 1)) / 4)