Event: A Division

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Opponent Rating Result
Dominic Leigh 1752 0 - 1
Stuart McLaughlin 1597 1 - 0
Joe McGinnis 1608 1 - 0
Jake Pearson 1784 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1685 = (6741 + 400 * (2 - 2)) / 4)

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