▁is ▁a ▁rival ry ▁between ▁the ▁Den ver ▁Bron cos ▁and ▁Kansas ▁City ▁Chief s ▁in ▁the ▁National ▁Football ▁League ' s ▁A FC ▁West ▁division . ▁Since ▁the ▁American ▁Football ▁League ▁was ▁established ▁in ▁ 1 9 6 0 , ▁the ▁Bron cos ▁and ▁the ▁Chief s ▁have ▁shared ▁the ▁same ▁division , ▁first ▁being ▁the ▁A FL ▁Western ▁Conference , ▁and ▁since ▁the ▁A FL – N FL ▁mer ger , ▁the ▁A FC ▁West . ▁For ▁years , ▁the ▁rival ry ▁has ▁featured ▁two ▁of ▁the ▁best ▁home - field ▁advantages ▁in ▁the ▁league . ▁ ▁The ▁Dallas ▁Tex ans / Ch ief s ▁domin ated ▁the ▁Bron cos ▁in ▁the ▁ 1 9 6 0 s , ▁the ▁de cade ▁of ▁the ▁A FL , ▁winning ▁ 1 9 ▁of ▁ 2 0 ▁games . ▁The ▁Bron cos ▁have ▁respond ed ▁since ▁then , ▁winning ▁the ▁series ▁of ▁every ▁subsequent ▁de cade ▁until ▁the ▁ 2 0 1 0 s ▁where ▁the ▁Chief s ▁narrow ly ▁won ▁ 1 1 - 9 . ▁The ▁Chief s / Tex ans ▁lead ▁the ▁series ▁ 6 3 – 5 5 , ▁but ▁since ▁the ▁Tex ans ▁moved ▁to ▁Kansas ▁City ▁and ▁became ▁the ▁Chief s , ▁they ▁lead ▁ 5 7 – 5 5 . ▁Dallas ▁swe pt ▁all ▁six ▁meet ings ▁in ▁the ▁rival ry ' s ▁first ▁three ▁years . ▁ ▁Notable ▁moments ▁▁ 1 9 9 0 – 1 9 9 4 Se ptember ▁ 1 7 ,