Event: A&B Division

Opponent Rating Result
Dave Frank 1516 ½ - ½
Jim A Rogers 1627 1 - 0
Chris Swales 1665 0 - 1
Ammar Alghasra 1500 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1677 = (6308 + 400 * (2 - 1)) / 4)

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