Event: Winchester

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Opponent Rating Result
Alexander Lee-Can 0 1 - 0
Hin Long Isaac Yip 1252 0 - 1
John Langdon 1391 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

748 = (2643 + 400 * (1 - 2)) / 3)

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