Welcome back to our weekly illustrated guide focusing on four games that had an impact on the College Football Playoff race. Previous weeks: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 No. 3 Oklahoma 58, No. 9 Oklahoma St. 23 The Sooners claimed the Big 12 title and look like a dangerous team steamrollering its way to the playoff. Oklahoma rushed for 344 yards against the Cowboys, winning its third straight against ranked opponents. No. 4 Iowa 28, Nebraska 20 The Hawkeyes again nailed their routine, completing an undefeated regular season. "We're not trying to be pretty, we're trying to be productive," Iowa coach Kirk Ferentz said. "Football's not gymnastics. There are style points in gymnastics. Here it's having one point more than your opponent. We're 12-0. You can't do better than that." No. 1 Clemson, No....