Event: Reading-Chess-Other-Rated

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Opponent Rating Result
David Johnson 1761 0 - 1
David Johnson 1739 1 - 0
Abhishek Pradhan 1891 0 - 1
Stuart W Knox 1910 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1625 = (7301 + 400 * (1 - 3)) / 4)

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