Event: U1650

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Opponent	Rating	Result
Zoya Boozorginia	1260	1 - 0
Vladimir Chtym	1513	0 - 1
George Mitchell	1503	1 - 0

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

1559 = (4276 + 400 * (2 - 1)) / 3)