Had the San Francisco 49ers lost to the Arizona Cardinals at home on Sunday, the Seattle Seahawks would have had a chance to win the division at home with a win over the St. Louis Rams. Since the Niners won, it wouldn't matter what the Seahawks did. They decided to win anyways.
The Seahawks are still going to the playoffs after their 20-13 win over the Rams, but they're going as a wildcard team in the No. 5 seed in the NFC. As the No. 5 seed, they'll be traveling to play the No. 4 seed, which will either be the Dallas Cowboys or the Washington Redskins, depending on who wins the Sunday Night Football game between the two NFC East foes.
The Seahawks have played one of those two teams this season. They defeated the Cowboys in Week 2 by a score of 27-7, but as every Seahawks enthusiast knows, the Seahawks are a different team when they're on the road than when they're at home.