Event: Under 13 Division Group A

Opponent Rating Result
Tobias Roberts 0 0 - 1
Gregory Mackie 0 0 - 1
Tobias Roberts 0 0 - 1
Alex Nock 0 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-300 = (0 + 400 * (0 - 3)) / 4)

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