Event: U1850

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Opponent	Rating	Result
David J Barker	1507	1 - 0
Henri Blin	1447	0 - 1
Louis Cowell	1627	0 - 1

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

1394 = (4581 + 400 * (1 - 2)) / 3)