So much for the demise of the Seahawks.

After two losses in five days led to some hard conversations among the Seahawks about how to get back on the winning track, and a lot of talk from the outside that their hopes of winning another Super Bowl might already be over, they responded with their best effort of the season to beat the previously unbeaten Kansas City Chiefs 20-3.

The win, coupled with a 29-20 loss by the 49ers (6-1) earlier Sunday at Atlanta, got the Seahawks — who are 4-3 — right back in the NFC West race.

“Our backs were against the wall, and just how we came out here as a brotherhood and fought,” said receiver Jaxon Smith-Njigba, who led the Seahawks’ offense effort with 150 yards receiving and a touchdown. “… We knew how big this game was. We wanted this one badly.…