Answered May 10th, 2020

Bernie Kosar has the worst completion percentage by a Browns quarterback in a game with 40+ passing attempts, at 36.6 percent against the Steelers on October 15, 1989.

which browns qb has the lowest completion percentage in a game with 40 attempts
Interpreted as:
Which browns qb has the lowest completion percentage in a regular-season game with 40 or more passing attempts?

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