Event: U1650

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Opponent	Rating	Result
John R McKenna	1622	1 - 0
Tom Bertins	1580	0 - 1
John Grasham	1604	1 - 0

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

1735 = (4806 + 400 * (2 - 1)) / 3)