Event: A Division

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Opponent Rating Result
Alan J Walton 2112 ½ - ½
Ali Reza Jaunooby 2188 0 - 1
Glenn Trueman 1912 ½ - ½
Noel S McLaughlin 1928 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1935 = (8140 + 400 * (0 - 1)) / 4)

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