Down three touchdowns, Alex Smith capped off the biggest comeback in Kansas City Chiefs history when he scored on the only possession of overtime giving the Chiefs a 33-27 win over the San Diego Chargers.

It took Kansas City 10 plays to march 75 yards in overtime. Smith won it on a QB keeper on third-and-goal from the 2-yard line.

Smith threw for 363 yards and two touchdowns and led the team back after their were down 24-3.

Scoring summary

FIRST QUARTER

FG 11:51
Cairo Santos 47 Yd Field Goal
7 plays, 46 yards, 3:09
3-0 Chiefs

TD 8:27
Melvin Gordon 1 Yd Run (Josh Lambo Kick)
6 plays, 75 yards, 3:24
7-3 Chargers

SECOND QUARTER

TD 14:06
Melvin Gordon 6 Yd Run (Josh Lambo Kick)
13 plays, 80 yards, 6:51
14-3 Chargers

TD 7:54
Danny Woodhead 4 Yd pass from Philip Rivers (Josh Lambo Kick)
6 plays, 38 yards, 3:32
21-3 Chargers

THIRD QUARTER

FG 6:02
Josh Lambo 29 Yd Field Goal
9 plays, 34 yards, 4:00
24-3 Chargers

TD 2:47
Tyreek Hill 9 Yd pass from Alex Smith (Cairo Santos Kick)
7 plays, 75 yards, 3:15
24-10 Chargers

Key play of the drive:

4th and 5 at SD 25
Smith pass short to Travis Kelce to SD 12 for 13 yards

FOURTH QUARTER

FG 13:24
Josh Lambo 28 Yd Field Goal
9 plays, 65 yards, 4:23
27-10 Charges

TD 9:18
Jeremy Maclin 19 Yd pass from Alex Smith (Cairo Santos Kick)
7 plays, 56 yards, 2:02
27-17 Chargers

Key play of the drive:

4th and 2 at SD 48
Smith pass short right to C.West pushed OB at SD 41 for 7 yards

FG 3:09
Cairo Santos 33 Yd Field Goal
12 plays, 62 yards, 3:40
27-20 Chargers

Key play of the drive:

3rd and 3 at SD 47
Smith pass short middle to Spencer Ware to SD 41 for 6 yards 

TD 1:03
Spencer Ware 5 Yd Run (Cairo Santos Kick)
4 plays, 42 yards, 0:46
27-27 tie game

Key play of the drive:

1st and 10 at SD 32
Smith pass deep middle to Jeremy Maclin to SD 10 for 22 yards. Unnecessary Roughness, 5 yards, enforced at SD 10

OVERTIME

TD 9:53
Alex Smith 2 Yd Run
10 plays, 70 yards, 5:07
33-27 Chiefs

Key play of the drive:

3rd and 3 at SD 30
Smith pass short left to Kelce for 8 yards to SD 22