Event: Essex Summer Rapid Knockout

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Opponent	Rating	Result
Paul R Barclay	1726	½ - ½
Paul R Barclay	1726	1 - 0
James M Robinson	1875	0 - 1
James M Robinson	1875	½ - ½

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

1801 = (7202 + 400 * (1 - 1)) / 4)