Event: A Division

Opponent Rating Result
Royce Parker 1768 1 - 0
Bill Wilson 1855 0 - 1
Stephen Cole 1849 1 - 0
Matthew Jackman 2015 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2072 = (7487 + 400 * (3 - 1)) / 4)

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