Event: Essex Summer Rapid Knockout

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Opponent	Rating	Result
Ben Harte	1641	½ - ½
Ben Harte	1641	1 - 0
James M Robinson	1901	½ - ½
James M Robinson	1901	0 - 1

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

1771 = (7084 + 400 * (1 - 1)) / 4)