Event: Open Rapid-play

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Opponent Rating Result
Tony Preece 1868 1 - 0
Simon C Smith 1893 1 - 0
Tony Preece 1868 1 - 0
Simon C Smith 1893 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2181 = (7522 + 400 * (3 - 0)) / 4)

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