Event: A Division

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Opponent Rating Result
Michael J Creaney 140 0 - 1
Andrew M Smith 165 ½ - ½
Mariana Mosnegutu 188 0 - 1
Andy Corbyn 151 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-39 = (644 + 400 * (0 - 2)) / 4)

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