Event: A Division

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Opponent Rating Result
Matthew Jackman 2015 0 - 1
Jonathan Sams 1829 0 - 1
Dominic Leigh 1752 ½ - ½
Keith Harrison 1577 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1693 = (7173 + 400 * (1 - 2)) / 4)

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Opponent Rating Result
Martin P McLoughlin 1820 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1820 = (1820 + 400 * (0 - 0)) / 1)