Event: Essex Summer Rapid Knockout

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Opponent	Rating	Result
Tom A Barton	1855	1 - 0
Tom A Barton	1855	0 - 1
Justin P Baptie	2160	1 - 0
Justin P Baptie	2160	1 - 0

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

2208 = (8030 + 400 * (3 - 1)) / 4)