Smith was the primary reason the Chiefs rallied from a 21 - point third - quarter deficit to record the greatest comeback win by margin in franchise history .
Smith completed 34 of 48 passes for 363 yards and three total touchdowns .
Smith , who completed 34 of 48 passes for 363 yards and three total touchdowns , was the primary reason the Chiefs rallied from a 21 - point third - quarter deficit to record the greatest comeback win by margin in franchise history .