Event: Ladder

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Opponent Rating Result
Leoninye Mitchell 1161 0 - 1
Michael Owen 1558 0 - 1
Michael Owen 1575 0 - 1
Simon Horrocks 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

874 = (4294 + 400 * (1 - 3)) / 4)

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