Event: Essex Summer Rapid Plate

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Opponent	Rating	Result
Ryan Colclough	1700	1 - 0
Ryan Colclough	1700	1 - 0
Graham J Kershaw	1656	1 - 0
Graham J Kershaw	1656	1 - 0

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

2078 = (6712 + 400 * (4 - 0)) / 4)