Chiefs 31, Broncos 10 — Week 1: Sixty Yards on Fourth and One

Fourth and one at the Kansas City 40, 12 53 left in the third quarter, up 14 to seven. Three linemen reported as eligible, the Chiefs ran Kenneth Walker to the left end, and he went 60 yards for a touchdown. 11 points of win probability on one snap, the biggest swing of the night, and the moment a one-score game stopped being one. Kansas City beat Denver 31 to 10 at Arrowhead on Monday night, led for 36 minutes and 18 seconds, was tied for the other 23 42, and never trailed.

Start with the run game, because that is the whole offense on this night. 35 rush plays, 224 yards, two touchdowns. By expected points added, that was worth +12.8 — expected points added is what a snap was worth given the down, the distance and the field position, so that is the value the ground game created above what those situations were already worth. Only Chicago's run game produced more in Week 1, per play and in total, and only Chicago ran for more yards. For the comparison: at the rate Denver's defense allowed runs last season, when it was a top-10 unit, those same 35 plays would have been worth about −1 and a half. The honest version of the number is that it was built on a handful of plays. Five runs went for 10 yards or more and gained a hundred 28 between them — Walker's 60, his 28 down the left side in the second quarter, his 12 13, and Patrick Mahomes' 15-yard scramble for the first touchdown. The other 30 rush plays gained 96. 19 of 35 gained three yards or fewer, and the run game's success rate, the share of snaps that kept the offense on schedule, was 43 percent, eighteenth of 32 teams this week. Explosive, not relentless. Both words are true.

The passing game was the quiet part. 29 pass plays produced −2.3 expected points, 20-first in the league this week per play, on a hundred 84 yards, two touchdowns and two sacks. Two completions did most of the work: Travis Kelce for 59 on third and six in the third quarter, down to the Denver four, and Emmett Johnson for 25 on third and five to open the fourth. The other 13 completions went for a hundred yards. The one interception was Kansas City's worst play of the night, by expected points and by win probability. First and 10 from the Kansas City three, up 21 to seven, Mahomes threw deep middle for Xavier Worthy and Brandon Jones picked it off at the 29 and ran it back to the five. −8 points of win probability. Denver got three out of it.

The defense is the paragraph that makes the score make sense. Denver ran 32 pass plays against this defense and they were worth −14.4 expected points — on defense, a big negative number is the good direction. Only Pittsburgh and Baltimore had a better night against the pass in Week 1. A hundred 31 passing yards allowed, the fewest any offense managed this week. Four sacks. Denver's longest completion of the night was 19 yards, and it was the touchdown. On third down the defense stopped 10 of 12, which ties Pittsburgh for second-best this week behind Jacksonville. Mansoor Delane's interception on the first drive set the tone: third and 11 from the Denver 34, Bo Nix threw deep middle for Courtland Sutton, Delane picked it off at the Kansas City 49 and returned it to the Denver 46. On the drive that followed, Mahomes scrambled 15 yards up the middle on second and 15 for the first points of the game. Against the run it was 14 plays, 62 yards, no touchdowns — seventh in the league this week by expected points per rush play, with the caveat that Denver barely tried it.

Fourth down deserves its own line. The Chiefs went for it twice and made both. Fourth and two at the Denver 38 on the opening touchdown drive, Walker up the middle for three. Then the 60-yarder. Third and short was the same idea: on third downs of one or two yards, Kansas City converted four of five, and the three of those that were runs all converted.

The drive that put the game in Kansas City's hands came before the half, and it started badly. Tied at seven, first and 10 from their own 20 with four 41 left, two incompletions to Walker. Then on third and 10 the snap was fumbled, Mahomes recovered it at the 16 and still got the ball to Walker for 11 and a first down. Next play, Walker around left end for 28 to the Denver 41. 10 plays, 80 yards, and Mahomes hit Rashee Rice for 13 and the touchdown with a minute 46 left. 14 to seven at the half, and Kansas City never led by fewer than seven again.

The only real blemish other than the interception was one trip inside the 20: after Kelce's 59 yards put the ball at the four, a Walker run lost two, a Mahomes scramble gained one, Zach Allen sacked Mahomes back to the nine, and Harrison Butker kicked a 28-yarder. 10 red-zone snaps for three touchdowns on the night is a fine number; that one was the miss.

Now the part where a Week 1 episode has to be honest about what it is. There is no season to compare this to yet, so the comparison is last year, and last year the Chiefs went six and 11 while Denver went 14 three, won the division, and beat Kansas City twice — 22 19 in Denver in Week 11 and 20 to 13 at Arrowhead in Week 17. In those two games Denver allowed the Chiefs 62 82 rushing yards. On Monday it allowed 224. Last season this run game was sixth in the league by expected points per play and the pass defense was fifteenth. On Monday the run game was second and the pass defense was third. So both things that decided this game were better than last year's version, and one game against a team that never led is not a season. But if you wanted one Week 1 result that argued with the division's pecking order, this was it.

Kansas City hosts Indianapolis next Sunday night at Arrowhead. Watch whether the run game's success rate rises to meet its yardage, and watch third down on defense.

That's your Chiefs — every game, by the numbers. This is Muffed: we do the same deep dive for all 32 teams. Follow the Chiefs show wherever you're listening, so next week's recap lands the moment it's out. No theater. Just the football.

And if you play fantasy, there's a Muffed show built around your exact roster — free at muffed.ai.

_Data via nflverse._