Event: A Division

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Opponent Rating Result
Ethan Norris 2249 1 - 0
H Michael Lamb 2078 ½ - ½
Yang-Fan Zhou 2436 ½ - ½
Tetsuaki Sanada 2035 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2300 = (8798 + 400 * (1 - 0)) / 4)

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