• Star defensive lineman has one sack, six tackles

• D’Andre Swift rushes for three touchdowns

• Seattle have lost three of their last four games

Caleb Williams threw a touchdown pass on the opening drive and Jeffery Simmons delivered just what Chicago needed on defense as the Bears beat the host Seattle Seahawks 34-17 on Monday night.

Williams was extremely efficient for the Bears (6-2) against one of the NFL’s stingiest defenses, committing no turnovers, taking just one sack and throwing for 247 yards while completing 71% of his passes.

Williams’s play helped set up three short touchdown runs by D’Andre Swift and that proved to be more than enough against Sam Darnold and the Seahawks (4-4), thanks to the impact Simmons had on the defense.

Acquired last week from Tennessee for a package that included two first-round picks, Simmons took little time to make a big impact on a defense that had lacked difference-makers.

He had a sack on the opening drive, added another tackle for loss and finished with six tackles and a pass defended as Chicago held Seattle to 252 yards and one third-down conversion on 11 tries.

“I’m so excited to be a Chicago Bear man,” Simmons told ESPN. “This is just the beginning. We’ve got some stuff to clean up but it’s a good football team and I’m happy to be a part of it.”

The reigning champion Seahawks lost for the third time in four games and are now looking up at the NFC playoff standings. They can ill afford many more slip-ups. The loss ended a 30-game streak for Seattle in the regular season and playoffs – the fourth longest for any team in the Super Bowl era – of not losing by more than four points.

Darnold went 17 of 34 for 188 yards and two touchdowns for Seattle, but his interception in the fourth quarter set up Swift’s third touchdown that made it 34-17 with 4:41 to play.

The Seahawks struggled once again to run the ball despite their trade last week for three-time All-Pro guard Quenton Nelson and the return of Zach Charbonnet and Jadarian Price from injures. Seattle ran for just 81 yards.

The Bears started off well against Seattle’s stout defense by putting together a 17-play drive on their opening possession. They took the lead when Williams threw a one-yard touchdown pass to Luther Burden III. Chicago added two more field goals in the first half and built the lead to 20-9 in the third quarter with another efficient touchdown drive that ended with a one-yard run by Swift.

The Seahawks were bottled up by Simmons and the Bears for almost the entire first half before Darnold connected with Jaxon Smith-Njigba on a 43-yard touchdown pass with 30 seconds left in the second quarter.

Things looked bleak for Seattle when Jason Myers had a 33-yard field goal blocked in the opening minute of the fourth quarter. But DeMarcus Lawrence forced a fumble by Colston Loveland on the next possession that set up Darnold’s seven-yard touchdown pass to Cooper Kupp, and Seattle converted the two-point attempt to make it 20-17.

The Bears answered with another touchdown drive and put the game away after Darnold’s interception.

Swift ⁠rushed 27 ​times for a game-high 69 yards, and Loveland and Burden each made seven receptions. The Seahawks had entered the game with an NFL-best .711 winning percentage on Monday Night Football (32-13).