AUSTIN, Texas (AP) — The expanded College Football Playoff has a decidedly old-school feel: Smothering defenses have carried the last four teams still in the hunt for the national championship.

If you want offense, look elsewhere this weekend. The defenses, with All-Americans spread throughout the lineups, are the story of the semifinals. Ohio State, Texas, Penn State and Notre Dame all rank among the top eight defenses nationally this season.

The No. 8 seed Buckeyes (12-2) meet the No. 5 Longhorns (13-2) in the Cotton Bowl on Friday night. The Buckeyes are No. 1 in total defense and scoring defense. Texas is ranked third and fourth, respectively.

The Orange Bowl matchup Thursday night between No. 7 Notre Dame (13-1) and No. 6 Penn State (13-2) feature run-stuffing defenses that shut down Georgia and Boise State’s Ashton Jeanty, the nation’s top running back, in the quarterfinals.