I would love to do a league wide analysis, but that would take forever. So lets just look at the Chiefs and see how they do when favored, and when not.
-2.5 vs Bengals. Bengals win by 13. Chiefs were favorite and lost game.
+10.5 at Broncos. Broncos win by 3. Chiefs were underdog, lost, and covered.
-7 vs 49ers. Chiefs win by 41. Chiefs were favorite and won and covered.
-3.5 at Cardinals. Chiefs win by 3. Chiefs were favorite and won, but did not cover.
+6.5 at Steelers. Steelers win by 38. Chiefs were underdog, lost, and did not cover.
+5.5 vs Chargers. Chiefs win by 3. Chiefs were underdog and won game.
-5.5 vs Seahawks. Chiefs win by 7. Chiefs were favorite and won and covered.
+2.5 at Rams. Chiefs win by 14. Chiefs were underdog and won game.
-3.5 at Dolphins. Dolphins win by 3. Chiefs were favorite and lost game.
-11 vs Raiders. Chiefs win by 3. Chiefs were favorite and won, but did not cover.
+1 vs Broncos. Chiefs win by 9. Chiefs were underdog and won game.
-5 at Browns. Browns win by 3. Chiefs were favorite and lost game.
-1.5 vs Ravens. Ravens win by 10. Chiefs were favorite and lost game.
Of the 13 games they have played so far:
8 times the Chiefs were favorites.
- 4 times they lost.
- 2 times they won and covered.
- 2 times they won but did not cover.
So that makes them 2-6 ATS as a favorite.
5 times the Chiefs were dogs- 3 times they won.
- 1 time they lost and covered
- 1 time they lost and did not cover.
That makes them 4-1 ATS as a dog.
In only 3 out of 13 games did the spread come into play. (+10.5 at Broncos, -3.5 at Cardinals, -11 vs Raiders)
Also, and the biggest note for gamblers, in Chiefs games, the underdog is 10-3 ATS. If you bet $20 on the underdog in Chiefs games every week, you would be up $140.