There was some significant movement in the new rankings released after the Week 13 games. While the top four teams in last week's rankings —Oregon, Ohio State, Texas, and Penn State—all took care of business, other teams projected to be in the 12-team College Football Playoff bracket suffered losses.

The Big 12 scenarios are particularly chaotic, but here is what’s at stake during the final weekend of college football’s regular season.

The loss by the Crimson Tide at Oklahoma also raised some serious questions about the Kalen DeBoer and the challenges of following a coaching great like Nick Saban. Clemson, meanwhile, got a boost in their hopes by slotting ahead of those two SEC schools.