Kansas City (9-0) dodged another bullet on Sunday to remain undefeated with a 23-13 victory at Buffalo (3-6).
For the Chiefs, it was their fifth straight week facing either a backup quarterback or one who'd taken over midseason, and to their credit, they again took full advantage.
Kansas City's defense allowed a season-high 470 yards and 25 first downs, but as they've been doing all season long, they came up with huge plays when it counted most.
This time, undrafted rookie Jeff Tuel, making his first NFL start, threw a 100-yard third-quarter pick-six when presented with a wide open Stevie Johnson and chance to put Buffalo up by two touchdowns.
Instead of a 17-3 Buffalo advantage, the game was tied at 10.
With the game knotted at 13 early in the fourth quarter,
and with Buffalo again deep in Kansas City territory, Tamba Hali returned a fumble 79 11 yards to put the Chiefs ahead for good.
KC mustered just 210 yards of offense, including 124 passing yards from Captain Checkdown.
The Chiefs now have a week to rest up before traveling to Denver in Week 11.
Meanwhile, San Diego (4-4) dropped another heartbreaker, this time a 30-24 overtime decision at Washington (3-5).
Facing a 24-21 deficit, the Chargers and Danny Woodhead thought they had a game-winning touchdown in the final minute of regulation, but the diminutive back was ruled short (of the goal line) with 21 seconds left.
Three failed plays later, Mike McCoy chose to leave his team's fortunes up to a coin flip, not unlike what Denver did in the playoffs last year.
In this case, San Diego never got the ball back, and fullback Darrel Young capped a 63-yard drive with his third rushing touchdown of the evening.
The Chargers will host the Broncos next Sunday.
Rounding out the division, Oakland (3-5) allowed a record-tying day to Nick Foles in a 49-20 thrashing by Philly (4-5).
Foles threw for 406 yards and matched Peyton Manning's seven touchdown passes from the season opener; Oakland racked up 560 empty yards of offense in the losing effort.
Terrelle Pryor totaled 382 yards passing and rushing, but undid much of that production with two costly picks.
Pryor left the game with a knee injury, while Darren McFadden departed with a hamstring injury.
Oakland travels to face the Giants next week.