Event: Open Rapid-play

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Opponent Rating Result
Callum J Gordon 2018 0 - 1
Chris Chadwick 1998 ½ - ½
Callum J Gordon 2018 1 - 0
Chris Chadwick 1998 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2108 = (8032 + 400 * (2 - 1)) / 4)

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