The final week of the regular season brings several battles for position in the conference title and College Football Playoff races. None of those are more compelling than the Big 12, which could have as many as eight teams tie for first.

The final slate of the college football season, rivalry week, has a reputation for upending college football’s best-laid plans. This year’s Week 14 might have its work cut out for it in that regard.

Which game on Rivalry Week is the toughest game to pick? According to the Pool Genius college football data grid, that matchup is between No. 12 Clemson and No. 16 South Carolina. That heated in-state rivalry between the Tigers and Gamecocks at Death Valley has the closest margin when trying to pick a winner.