Event: Division 4

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Opponent Rating Result
Peter FK Evans 90 1 - 0
Joshua T Brown 90 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

290 = (180 + 400 * (1 - 0)) / 2)

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Opponent Rating Result
Peter FK Evans 90 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-310 = (90 + 400 * (0 - 1)) / 1)