Event: A Division

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Opponent Rating Result
Giuseppe Magazzu 1982 ½ - ½
John S Garnett 1959 ½ - ½
Virgil Szekely 2172 0 - 1
Brian Ellis 1694 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1952 = (7807 + 400 * (1 - 1)) / 4)

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