Event: Club matches

Opponent Rating Result
Mark C Rich 0 0 - 1
Mark C Rich 0 0 - 1
Mark C Rich 0 0 - 1
Mark C Rich 0 0 - 1
Mark C Rich 0 0 - 1
Mark C Rich 0 0 - 1
Mark C Rich 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-400 = (0 + 400 * (0 - 7)) / 7)

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