Event: City Chess Swiss 2019-20

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Opponent Rating Result
Travis Shafer 1735 0 - 1
Martin Lake 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

668 = (1735 + 400 * (0 - 1)) / 2)

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

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