Event: 560 Max

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Opponent Rating Result
Steve F Tarr 148 0 - 1
Jonathan Dale 161 1 - 0
Steve F Tarr 148 0 - 1
Jonathan Dale 161 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

55 = (618 + 400 * (1 - 2)) / 4)

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