Entering Week 14, it was believed it was pretty simple for the Arizona Cardinals. With a win, they clinched a playoff berth. With a win and a loss or tie by the Seattle Seahawks, they would lock up the NFC West crown. Arizona won, punching their ticket for the playoffs, but Seattle also won.
So the "magic number" is one, or so we believed.
There is one scenario in which neither the Cardinals have to win nor the Seahawks have to lose. It has to do with the fifth tie-breaking scenario for determining a division winner -- strength of schedule.