Rules
To be considered a sack the quarterback must intend to throw a forward pass. If the play is designed for the quarterback to rush (run) the ball, any loss is subtracted from the quarterback's rushing total. (and the play is ruled a Tackle-for-loss as opposed to a sack) If the quarterback's intent is not obvious, statisticians use certain criteria, such as the offensive line blocking scheme, to decide. Unique situations where a loss reduces a quarterback's rushing total (not a sack) are "kneel downs" (used to run time off the game clock).
A player will receive credit for half of a sack when multiple players contribute to the sacking of a quarterback, even if more than two players contributed.
Read more about this topic: Quarterback Sack
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—Jeannette W. Galambos (20th century)
“For rhetoric, he could not ope
His mouth, but out there flew a trope;
And when he happen’d to break off
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—Samuel Butler (1612–1680)
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—Susan Sontag (b. 1933)