Event: League

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Opponent Rating Result
Steven Lewis 161 0 - 1
Steven Lewis 161 ½ - ½
Joanne Hutchinson 147 0 - 1
Bernard Pratten 144 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-147 = (613 + 400 * (0 - 3)) / 4)

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