Event: League

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Opponent Rating Result
James McKiernan 0 0 - 1
Andre Coltman 0 ½ - ½
Ewan Kershaw 0 0 - 1
David W Shaw 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-100 = (0 + 400 * (1 - 2)) / 4)

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