Event: OTB Knockout

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Opponent Rating Result
James Walsh 1486 1 - 0
Istvan Karacsony 1825 ½ - ½
John Cawdery 2089 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1800 = (5400 + 400 * (1 - 1)) / 3)

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