Phil Simms has the highest completion percentage by a quarterback with 14+ passing attempts in a Super Bowl, at 88.0 percent in Super Bowl XXI versus the Broncos on January 25, 1987.

highest completion percentage by a qb in the super bowl of the playoffs who attempts a minimum of 14 passes
Interpreted as:
highest completion percentage by a qb in the super bowl of the playoffs who passing attempts a minimum of 14 passes

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