Bills vs. Chiefs score, takeaways: Josh Allen's fourth-down TD propels Buffalo, hands Kansas City first loss

We'll see you in January 

Certainly won't be the last time Allen and Mahomes square off. 

BUFFALO WINS IT

The Bills will knock off the Chiefs from the ranks of the unbeaten. Patrick Mahomes was picked off by Terrel Bernard on 4th-and-13 to give the Bills their sixth straight win and hand the Chiefs their first loss. First loss for the Chiefs since Christmas. 

Tony Romo delivers again

WATCH THIS ALLEN RUN

On 4th-and-2, Josh Allen makes three defenders miss after his first and second reads were covered. Allen takes it himself for the 26-yard score. The Bills are up 30-21. The Bills are the first team to score 28+ points on the Chiefs in the last 30 games. 

Bills up 30-21 with 2:17 left. 

JOSH ALLEN GETS THE TD! 

Don't understand the Bills taking the ball out of Josh Allens' hands on 3rd-and-2. Let No. 17 run or throw for the first. The Bills have a decision to make. Kick it and go up five or go for it and extend the drive. Bills will go for it. 

Money throw by Josh Allen. Money catch by Khalil Shakir. Cook absolutely leveled Shakir as soon as the ball was in his hands. On 3rd down no less. First down Bills. 4:19 left. 

Tracy Wolfson is reporting Josh Allen went into the blue medical tent after that last TD pass to get his right hand checked out. Allen is back in the game and throws a first down pass on his first attempt. 

What a catch by Noah Gray!

Mahomes with an incredible throw to the back corner of the end zone, but Gray somehow got both feet in bounds. Mahomes threw it on a rollout where only Gray could have caught it. Sharder with the extra point to make it 23-21. 

Two touchdown catches for Gray on the season, both in this game. Mahomes with 3 TD passes today. We got a game folks. 

Chiefs deep in the red zone. Looking to keep this game within one score. They have a first-and-goal at the 1. 

The Chiefs have won 7 straight when down at halftime.

They have won 9 straight by trailing by 7+ points.

The Bills are making this streak very difficult to extend. 

Bills extend their lead!

The Chiefs had a five-man front and sent six. With the open field, Josh Allen found Curtis Samuel for the 12-yard TD. The Bills are up two scores for the first time in this one. 10-play, 83-yard drive for the Bills as they take a 23-14 lead with 12:51 left

The Bills are on the doorstep of scoring again. Allen finds Shakir for a 22-yard gain to end the third quarter. The Bills are at the Chiefs 27-yard line after a scoreless third quarter. They lead 16-14 going into the fourth. 

They're gonna get Conner on a PI here. Allen wanted the flag and Conner pulled Curtis Samuel's arm as he wa strying to make a one-handed catch. 22-yard penalty for the Chiefs. 

Bills rushed five on 3rd-and-14. Mahomes did a dump off to Kelce, but he gained little yards. Chiefs punt after getting to their own 41. The defenses have really adjusted. Still 16-14 Bills in the 3rd. 

The Bills get a first down this drive, but get to midfield when the drive stalls. Defenses are adjusting to start the 2nd half. Still 16-14 Bills. 

Hard to fall for that Andy Reid bluff on 4th-and-1 from his own 29. That's not what Reid does, and the Chiefs were wise not to go for it. 3-and-out for KC. 

Bills got 3-and-out to start the 2nd half. Just like the Chiefs, no points on 1st possession to open half. 

Second half has just begun. let's see if Bills can double dip on the scoring. They got a FG prior to the half. Can make it up to a 10 or 11 point swing if they score a TD. 

Bills take lead at half

Tyler Bass avenges the missed extra point to convert a 33-yard FG at half. Both Mahomes and Allen have an INT in the first half (that their teams have capitalized off of). It's 16-13 Bills at half. Have five lead changes in the first half. 

This one has certainly lived up to the hype. 

Bills in the red zone. Looking for at least a FG at halftime to take the lead, but a TD would be better. Remember they get the ball to start the 2nd half. 

The missed face mask call as not affected Buffalo yet, but a huge 3rd-and-1 is on the way. The Chiefs have not given up a first half TD in the last two minutes of a game this year. Bills on the Chiefs' 34. 

Chiefs retake lead on TD! 

Patrick Mahomes finds a wide open Noah Gray for the TD. Mahomes got rid of that ball quick and Terrel Bernard was late getting to Gray. Shrader hits the extra point and the Chiefs take a 14-13 lead. 

4th lead change of the first half

Still not sure what Josh Allen was doing here. Again, execution over decision to go for it. 

Josh Allen INT

The Bills go for it on 4th-and-3 from the Chiefs' 34 and Allen makes a very bad decision when he gets rid of the ball. Insteda of going up 2 scores, the Bills go for it and it leads to a Chamarri Conner interception -- which he takes back to Bills' 40. 

A few head-scratching decisions by McDermott in this first half. This one is up for debate. 

Von Miller is back! Miller sacks Patrick Mahomes on 3rd-and-10 and the Chiefs go 3-and-out. The Bills have another chance to extend their lead after Codrington got a 25-yard punt return. 

Bills already in Chiefs territory. 

Xavier Worthy HAS to drag that back foot. If he does, the Chiefs get that 40+ yard pass they were lacking. Big play taken away from the Chiefs. 

James Cook has 3 games with 2+ TD -- all coming this year. 

James Cook TD No. 2

After a Chiefs challenge, catch stands. Bills have a 1st-and-goal from the 7 and James Cook scores. The Bills retake the lead. 

Cook has 6 carries for just 16 yards, but 2 TD. Tyler Bass gets the XP this time. It's 13-7 Bills. 

Amari Cooper has two 20+ yard catches for the Bills today -- if this 24-yard catch holds. Josh Allen put it right in the bucket, but did Cooper get that 2nd foot in?