Event: Sheffield Mini Standardplay OTB

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Opponent Rating Result
Stephen K Lee 1668 1 - 0
George Swanson 1540 0 - 1
Alannah Ashton 1582 0 - 1
Mengzheng (Evan) Shi 119 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1227 = (4909 + 400 * (2 - 2)) / 4)

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