Event: Essex Summer Rapid Plate

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Opponent	Rating	Result
Charlton Siddo	1679	1 - 0
Charlton Siddo	1679	1 - 0
Istvan Karacsony	1755	0 - 1
Istvan Karacsony	1755	0 - 1

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

1717 = (6868 + 400 * (2 - 2)) / 4)