Event: A Division

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Opponent Rating Result
Lorand Sakic 1990 0 - 1
Tim Hilton 2002 ½ - ½
Amy Lovatt 1788 ½ - ½
Anthony Prime 1605 1 - 0
Richard A Gavin 1815 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1760 = (9200 + 400 * (1 - 2)) / 5)

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