It 's even more difficult to do so at Arrowhead Stadium and against a team that had opened the season 9 - 0 .
Arrowhead Stadium features one of the NFL 's great home - field advantages .
It 's even more difficult to do so at Arrowhead Stadium , which features one of the NFL 's great home - field advantages , and against a team that had opened the season 9 - 0 .