Event: Rated Friendlies

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Opponent Rating Result
S Ali Arshad 1180 0 - 1
S Ali Arshad 1180 0 - 1
Mark Randell 1195 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

918 = (3555 + 400 * (0 - 2)) / 3)

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