Event: Open

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Opponent	Rating	Result
Andrew A Clarkson	0	1 - 0
Piotr Niedbal	1919	1 - 0
Jonathan P Nelson	2184	½ - ½

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

1634 = (4103 + 400 * (2 - 0)) / 3)