Event: B Division

Opponent Rating Result
Dave Toole 1901 0 - 1
Andrew Crowther 1689 1 - 0
William McCartney 1405 ½ - ½
Mahin Rughani 1824 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1605 = (6819 + 400 * (1 - 2)) / 4)

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