The Broncos opened at 1.5-point favorites and I saw lines over this past week for the Broncos as 1-2 point favorites at various places. Now I am looking at SB Nation's NFL odds page and I see that multiple outlets are now offering the Chiefs up as a 1-point favorite.
There are still other outlets that have the Broncos as the slight favorite so clearly this will be tight.
This shows the power of Arrowhead. The Chiefs were favored two weeks ago over the defending Super Bowl champions and now they could be favored over the team that the Super Bowl champs beat. Not bad for Arrowhead.
This also shows the importance of the Chiefs playing at home in the playoffs rather than the road, which highlights the importance of this game. A win and the Chiefs AFC West hopes are still alive. A loss and there's no reasonable way they're winning the division title.
I'll update this if the line on this game continues to move.