SANTA CLARA, Calif. — After weeks of shaky play, the San Francisco 49ers got back to their old form with one of the most dominant first halves in years.
Brock Purdy threw for 325 yards and two touchdowns and the 49ers bounced back from two blowout losses to beat Chicago 38-13 on Sunday and spoil interim coach Thomas Brown's debut for the Bears.
''We just got back to being us, honestly,'' linebacker Fred Warner said. ''The product we were putting on the field the last couple weeks just wasn't us. We knew that. We had a great opportunity this week to come out at home and right those wrongs and get back to playing our style and what we do best.''
The 49ers (6-7) had been outscored by 53 points the past two weeks in losses at Green Bay and Buffalo that left their playoff hopes teetering with several stars such as Christian McCaffrey, Nick Bosa and Trent Williams sidelined by injuries.
That prompted coach Kyle Shanahan to have Purdy and cornerback Deommodore Lenoir address the team at a meeting Saturday night that resonated with the team.
''The message was we need to play with more of a sense of urgency and play desperate,'' tight end George Kittle said. ''Because you just hadn't really sensed that.''
But San Francisco delivered a performance more reminiscent of a year ago when the Niners went to the Super Bowl, handing the Bears (4-9) their seventh straight loss after outgaining them by 315 yards on the way to a 24-0 halftime lead.
Purdy delivered his third 300-yard passing game of the season with two TDs to Jauan Jennings, fill-in back Isaac Guerendo gained 128 yards from scrimmage and scored on two TD runs and Kittle had six catches for 151 yards. That helped deliver the highest-scoring game of the season for the 49ers.