Event: SASCA Rapidplay

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Opponent Rating Result
Xiaorui Wang 50 0 - 1
William Hart 934 1 - 0
Freddie Bond 772 0 - 1
John Wiles 998 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

689 = (2754 + 400 * (2 - 2)) / 4)

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