Event: League

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

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

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Opponent Rating Result
Jack Bow 0 0 - 1
John Marshall 0 1 - 0
Richard J Walsh 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-133 = (0 + 400 * (1 - 2)) / 3)