Event: MCA Division 4

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Opponent Rating Result
James Williams 1567 1 - 0
John J Grady 1644 0 - 1
Andrew J Savage 1900 0 - 1
Nathan Haddy 1478 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1447 = (6589 + 400 * (1 - 3)) / 4)

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