We've reached championship weekend of the 2025 NFL Playoffs and we'll see a reprisal of one of the NFL's most important rivalries on Sunday at the 2025 AFC Championship Game. The Kansas City Chiefs will host the Buffalo Bills with a trip to Super Bowl LIX on the line and NFL fans will be treated to Patrick Mahomes vs. Josh Allen part IX in the playoffs. Allen holds a 4-1 edge during regular-season matchups, including a 30-21 victory on Nov. 17, but Mahomes is 3-0 against the Bills in the postseason.

Kickoff from GEHA Field at Arrowhead Stadium in Kansas City, Mo., is set for 6:30 p.m. ET, and you can catch all the action on CBS and Paramount+. Kansas City is a 1.5-point favorite in the latest Bills vs. Chiefs SportsLine consensus odds, while the over/under for total points scored is 47.5. The Chiefs are -128 money-line favorites (risk $128 to win $100), while the Bills are +106 underdogs (risk $100 to win $106). 

Before making any Bills vs. Chiefs picks or predictions of your own, you NEED to see which side SportsLine NFL expert Larry Hartstein is on. 

A former lead writer for Covers and The Linemakers, Hartstein combines a vast network of Vegas sources with an analytical approach he honed working for Pro Football Focus. He tied for 52nd place (out of 1,598 entries) in the 2022 Westgate Las Vegas SuperContest, going 53-34-3 ATS. Hartstein's weekly Vegas contest selections form the basis of his NFL best bets column, which is 79-48-2 (62.2%, +25.95 units) since its inception in 2022. He's also an incredible 30-16 (+1094) on his last 46 NFL picks involving the Chiefs! Anyone who has followed him could be WAY UP!

Now, Hartstein has locked in another confident against-the-spread pick for Bills vs. Chiefs on Sunday.

We can tell you he's leaning Over on the point total, but he also knows a crucial X-factor makes one side of the spread a MUST-BACK! You ABSOLUTELY NEED to see what it is before locking in any picks of your own.

So who wins Chiefs vs. Bills on Sunday, and what X-factor makes one side of the spread hit HARD? ... Join SportsLine RIGHT NOW to see which side of the Bills vs. Chiefs spread hits HARD, all from the expert who is an amazing 30-16 on picks involving the Chiefs!