Williams completed 71 percent of his passes for 247 yards without committing a turnover or taking more than a single sack against one of the league's toughest defenses. His composed display provided the foundation for a dominant offensive and defensive display from the visitors.

D'Andre Swift capitalized on the offensive momentum by punching in three short touchdown runs during the encounter. Swift carried the ball 27 times for a game-high 69 yards to anchor Chicago's ground game.

Simmons, acquired last week from Tennessee in a high-profile trade involving two first-round draft picks, wasted no time establishing his presence on the defensive line. He recorded a sack on the opening drive, finished with six tackles, added another tackle for loss, and contributed a pass defended.

The formidable defensive effort spearheaded by Simmons limited Seattle to just 252 total yards. The hosts managed only one successful conversion on 11 third-down attempts throughout the match.

For the Seahawks, quarterback Sam Darnold completed 17 of 34 passes for 188 yards and two touchdowns. However, his fourth-quarter interception proved costly, setting up Swift's final touchdown that effectively sealed the outcome.

The defending champions suffered their third loss in four games, dropping their record to 4-4 and losing ground in the NFC playoff race. The defeat also snapped a 30-game regular-season and playoff streak for Seattle of not losing by a margin greater than four points.

Despite trading for three-time All-Pro guard Quenton Nelson last week and welcoming back running backs Zach Charbonnet and Jadarian Price from injuries, Seattle struggled to establish an effective running game, finishing with just 81 yards on the ground.

Chicago opened the scoring with a lengthy 17-play drive capped by Williams throwing a one-yard touchdown pass to Luther Burden III. The Bears added two field goals in the first half to establish control.

Seattle responded just before halftime when Darnold connected with Jaxon Smith-Njigba on a 43-yard touchdown pass with 30 seconds remaining in the second quarter. The score narrowed the deficit heading into the interval.

The Seahawks showed signs of a comeback in the final quarter after Jason Myers had a 33-yard field goal blocked early on. DeMarcus Lawrence subsequently forced a fumble by Colston Loveland, allowing Darnold to throw a seven-yard touchdown pass to Cooper Kupp and convert a two-point attempt to bring Seattle within three points at 20-17.

Chicago quickly extinguished any hopes of a home rally by responding with another methodical touchdown drive. Swift's third touchdown plunge, enabled by Darnold's late interception, extended the margin to 34-17 with 4:41 remaining on the clock.

Both Loveland and Burden were heavily involved in the passing attack, securing seven receptions apiece to support Williams's efficient aerial distribution. The loss marked a rare home setback on Monday Night Football for Seattle, who had entered the fixture boasting the NFL's best winning percentage in the prime-time slot.

The victory allowed the Seahawks to improve their record to 4-3 and snap a two-week losing skid. Meanwhile, the Chiefs suffered their first defeat of the 2026 NFL campaign, dropping their record to 5-1 after a frustrating evening in the Pacific Northwest.

Seattle's offense showed notable progress under coordinator Brian Fleury, accumulating 410 total yards and converting 11 of 16 third-down opportunities. Sam Darnold guided the unit efficiently, completing 20 of 28 passes for 257 yards and one touchdown.

Smith-Njigba proved to be the focal point of the passing game throughout the contest, racking up 150 receiving yards. His exceptional route-running and reliable hands repeatedly solved the blitz packages designed by veteran Chiefs defensive coordinator Steve Spagnuolo.

The standout receiver made NFL history during the encounter by crossing significant seasonal milestones. Per league records, he became the first player in the Super Bowl era to record at least 850 receiving yards and eight touchdowns through seven games.

Reflecting on the crucial divisional and inter-conference battle, Smith-Njigba emphasized the collective spirit of the locker room. He noted that the squad faced immense pressure following recent setbacks and responded with immense resilience as a brotherhood.

Darnold enjoyed a stellar first half, completing 13 of his initial 17 attempts for 178 yards and an early touchdown. However, a glaring mistake occurred in the final seconds before intermission when he forced a pass into traffic that was intercepted.

That miscue marked Darnold's eighth interception over his last five appearances, keeping a minor blemish on an otherwise disciplined evening. Crucially, the quarterback avoided taking a single sack behind an improved offensive line performance.

Kansas City's offense encountered a brick wall in the form of Seattle's defensive scheme, failing to reach the red zone all night. Their deepest penetration reached only the Seattle 27-yard line before stalling completely.

Kicker Harrison Butker compounded the offensive misery by missing a field goal attempt during a thoroughly unfulfilling performance. The defending champions sorely missed injured personnel, including key tackles and wide receivers.

The absence of wideouts Rashee Rice and Tyquan Thornton severely depleted Patrick Mahomes' receiving options on the perimeter. Rice sat out with a strained hamstring, while Thornton remained sidelined on the injured reserve list following ankle surgery.

Consequently, Kansas City's supporting cast of wide receivers managed a meager total of six receptions for 39 yards. Mahomes faced intense pressure on more than half of his first-half dropbacks, severely limiting his downfield effectiveness.

Much of the pre-match narrative focused on running back Kenneth Walker III facing his former team for the first time. Walker entered the weekend leading the National Football League in rushing yards following a productive start to the season.

However, Macdonald's defense maintained an incredible franchise streak by neutralizing the ground threat entirely. Seattle has now gone 36 consecutive games without surrendering a 100-yard rusher, representing the longest active streak across the NFL.

The Seahawks deployed two deep safeties for the majority of the evening to contain Walker's explosive rushing capabilities. The strategy worked to perfection as the star running back was restricted to just 36 yards on 14 carries.

Kansas City's lone defensive highlight arrived in the closing seconds of the second quarter when cornerback Nohl Williams intercepted Darnold. Williams returned the turnover 65 yards to give his team a brief opportunity for points before halftime.

Despite dropping their first game of the season, the Chiefs remain near the summit of the AFC West standings. General manager Brett Veach faces mounting pressure to explore trade options before the upcoming November deadline to bolster the wide receiver corps.

The Seahawks climbed closer in the competitive NFC West picture, benefiting from earlier results involving divisional rivals. Mike Macdonald's tactical adjustments proved vital in stifling a Kansas City squad that had looked virtually unstoppable previously.

Looking ahead to the upcoming schedule, the Seahawks will prepare to host the Chicago Bears at Lumen Field. That fixture is scheduled for November 2 under the prime-time lights as Seattle attempts to build sustained momentum.

Meanwhile, the Chiefs must quickly regroup before hitting the road for a critical AFC West showdown. They travel to face the Denver Broncos next Sunday afternoon in a fixture carrying significant divisional implications.