Event: Open-Rapid-play

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Opponent Rating Result
Mircea-Marius Mesesan 1957 ½ - ½
Chris Chadwick 1943 ½ - ½
Chris Chadwick 1943 1 - 0
Mircea-Marius Mesesan 1957 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1950 = (7800 + 400 * (1 - 1)) / 4)

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