Event: League

Opponent Rating Result
Michael Farthing 0 0 - 1
Iain Walmsley 0 1 - 0
Sean Parker 0 ½ - ½
Baha Tastan 0 0 - 1
John A Metcalfe 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

0 = (0 + 400 * (2 - 2)) / 5)

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Opponent Rating Result
Jonathan Verden 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-400 = (0 + 400 * (0 - 1)) / 1)