Conference championship weekend marks the final opportunity for teams to solidify their spot in the four-team College Football Playoff.

The last ranking before the final one comes out Sunday, Dec. 6 at noon ET, looks like this: No. 1 Clemson, No. 2 Alabama, No. 3 Oklahoma, and No. 4 Iowa, with Michigan State and Ohio State coming in at Nos. 5 and 6, respectively.

The games on tap for this weekend could severely alter the top four. Or it could stay perfectly intact. This is what’s in store for Saturday:

SEC Championship: No. 2 Alabama vs. No. 18 Florida
4 p.m. ET – CBS

Pac 12 Championship: No. 7 Stanford vs. No. 20 USC
7:45 p.m. ET – ESPN

Big Ten Championship: No. 4 Iowa vs. No. 5 Michigan State
8 p.m. ET – FOX

ACC Championship: No. 1 Clemson vs. No. 10 North Carolina
8 p.m. ET – ABC

Here are this week’s Playoff ranking winners and losers:

Winners

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Oklahoma and the Big 12

Does this mean the Big 12 is going to the Playoff? No. 3 Oklahoma won its conference when it won Bedlam over Oklahoma State in Stillwater on Saturday night. The Big 12 doesn’t have an official conference championship game to play this weekend, but the Sooners are the undisputed “one true champion” and the committee has ranked them firmly at No. 3 for two straight weeks. No matter what happens this Saturday in the SEC, ACC, Big Ten and Pac 12 championship games, it doesn’t seem like Oklahoma could lose its footing by not playing.

Depending on how the Big Ten title game goes, perhaps Oklahoma gets docked one spot to No. 4 and Michigan State or Iowa moves to No. 3 in the final ranking. But it would be hard to see OU being left out at this point.

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Alabama, Clemson, Iowa and Michigan State

Win and you’re in. It’s as simple as that.

Losers

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North Carolina

There’s a lot of talk about North Carolina. The Tar Heels are 10-1 and have a legitimate shot of upsetting No. 1 Clemson for the ACC title. So what if that happens? Could the committee reward this conference champion with a Playoff bid? The problem is, this week UNC is ranked No. 10. Can it hop six spots to the final four? Last year Ohio State was ranked sixth at this point before playing for the Big Ten title. The Buckeyes embarrassed Wisconsin 59-0 to win the conference, were rewarded with a No. 4 ranking, and went onto win the national championship. Jumping two spots is different than six, not to mention the committee has some issues with the Tar Heels.

Yes, beating the No. 1 team in the country would arguably be the biggest win of the season, but chairman Jeff Long has brought up strength of schedule woes. North Carolina ranks 63rd in the Sagarin Ratings with no matchups against Top 30 teams. It has played two FCS opponents and its one loss was the first week of the season to South Carolina, who went onto finish 3-9. And Clemson isn’t the only ACC team ranked ahead of UNC. The committee has Florida State at No. 9 this week.

Long wouldn’t speculate about where the committee would ultimately place the Tar Heels should they win the ACC, but this is what he said Tuesday night after the ranking was revealed:

“There’s no question UNC has improved and has impressive victories, but its overall strength of schedule is important,” he said.

Carolina players are also clearly paying attention:

Matt Cashore-USA TODAY Sports

Stanford

If any team (not including Michigan State should the Spartans win the Big Ten) currently outside the top four were to make the Playoff, it would likely be No. 7 Stanford. But if none of those teams lose, well, the Cardinal will be left out. Even though this team has two losses, it wouldn’t be unfathomable for Stanford to make the Playoff if it beats USC and Alabama or Clemson lose. The committee values conference champions and Stanford would likely be favored over say North Carolina and Ohio State for the final spot because it won the Pac 12, played nine league games and had non-conference matchups against Northwestern and Notre Dame.

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Ohio State

The committee ranked Ohio State at No. 6 this week. The problem here is false hope. In order for the Buckeyes to make the Playoff, Alabama and Clemson would both need to lose. This has been a wacky college football season, so nothing is out of the realm of possibility, but both teams are expected to win. The reason this is the case for the reigning national champions is due to the fact that they cannot win their conference. Michigan State and Iowa are playing for the Big Ten and the winner will go to the Playoff. Should Alabama or Clemson lose, then it would likely be Stanford, assuming the Cardinal win the Pac 12, jumping Ohio State for that last spot because the committee takes conference champions into consideration for the Playoff field.

If Alabama, Clemson and Stanford all lose, then it gets tricky in the battle between Ohio State and ACC champion North Carolina. The Buckeyes have a stronger schedule and a better loss (to Michigan State), but no conference title to its name.

Here’s what Long had to say about tiebreakers:

“If it’s at a deadlock, then we add the conference championship game,” he said.

Ohio State will be cheering for the underdogs this weekend.