Event: Peter Harrison Knockout Cup

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Opponent Rating Result
John Lightowler 1661 0 - 1
Thomas Weavin 1668 1 - 0
Robert Lacey 1444 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1458 = (4773 + 400 * (1 - 2)) / 3)

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