Tight end Eric Saubert made the game-winning two-point play for Seattle.
The Seattle Seahawks staged a stunning fightback to overcome the Rams in extra time, securing their place in the NFL play-offs.
Rallying from a sixteen-point hole in the fourth quarter, the Seattle squad triumphed by a single point at home, registering their fifth consecutive victory.
While the Rams had already secured a playoff spot earlier on Sunday, the Seattle team secured their place to the play-offs after a two-year hiatus.
With this result, the Seattle now lead their Conference race with a 12-3 mark, replacing the Los Angeles, who dropped to the fifth seed with an 11-4 standing.
Signal-caller Darnold threw two interceptions but regrouped to make two touchdown passes, culminating in the tying score to star receiver Jaxon Smith-Njigba in overtime.
The Rams held a six-point advantage at the break before Kenneth Walker III burst through for a long touchdown run for the home side.
Rams defensive back Josh Wallace then took back Darnold's initial pick for a big return, setting up a short touchdown by Blake Corum on the next play.
In the final stanza, a touchdown from Matthew Stafford to Nacua extended the Rams' lead to sixteen points, but Shaheed ignited Seattle's comeback with a spectacular punt return.
Darnold then connected with AJ Barner in the endzone, and a converted conversion forced the game into overtime.
Although Puka Nacua scored for his another touchdown in overtime, Smith-Njigba answered in kind to set up the game-winning conversion.
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