Instant analysis of 49ers’ 42-38 win over Bears to keep alive bid for No. 1 seed

SANTA CLARA – One play into Sunday night’s showdown and the No. 1 seed looked like a lost cause.

That’s not how this 49ers season goes, however. Overcoming adversity is just what they do.

Brock Purdy shook off an opening-snap pick-six that put them in a 7-0 hole, the 49ers blew four subsequent leads, and they ultimately rallied in the final minutes for a 42-38 win over the NFC North-champion Chicago Bears at Levi’s Stadium.

Purdy found Jauan Jennings for a 38-yard touchdown...