Event: A Division

Opponent Rating Result
Bill Wilson 1855 1 - 0
Steven B Booth 1967 ½ - ½
Francis Batchelor 2067 1 - 0
Stephen W Dauber 2036 1 - 0
Giuseppe Magazzu 1982 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2221 = (9907 + 400 * (3 - 0)) / 5)

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