Event: Essex Summer Rapid Knockout

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Opponent	Rating	Result
Michael Wickham	1924	1 - 0
Michael Wickham	1924	1 - 0
David Harrington	1514	1 - 0
David Harrington	1514	1 - 0
Muhammad Faheem	1628	1 - 0
Muhammad Faheem	1628	1 - 0

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

2089 = (10132 + 400 * (6 - 0)) / 6)