Event: A Division

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Opponent Rating Result
Chris N Ross 2220 0 - 1
Richard J Harris 1726 0 - 1
Jake Pearson 1784 0 - 1
Royce Parker 1768 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1675 = (7498 + 400 * (1 - 3)) / 4)

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