Event: Division A

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Opponent Rating Result
Paul D Doherty 1749 0 - 1
Ronnie Whiteside 1733 ½ - ½
Marlon Espiritu 1758 0 - 1
Ronnie Whiteside 1733 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1643 = (6973 + 400 * (1 - 2)) / 4)

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