The 49ers had seen this film earlier in the season, but this time they rewrote the ending.

After double-digit lead-ups in the second half against the Rams and Cardinals, the 49ers held their own after going up double digits. San Francisco, which led 23-3 before the Seahawks scored 14 straight points, eventually won 36-24.

Both teams are 3-3 and tied for the NFC West lead, but the Seahawks have lost three in a row.

It felt like a must-win for the 49ers after coming in with an 0-2 division record and 0-3 conference record and with games against the Chiefs and Cowboys next on the schedule.

It came down to turnovers, with the 49ers scoring 13 points on three takeaways. The 49ers should have had a fourth, but the officials missed a muffed punt by Seattle returner Dee Williams, and replay did not correct it. Amazon Prime replays clearly showed the ball hitting Williams’ finger while Jalen Graham was recovering for the 49ers at the Seattle 18.

Instead, the Seahawks had a chance to come back, like the Rams and Cardinals did to the 49ers.

But 49ers rookie cornerback Renardo Green intercepted Geno Smith with 7:46 to go and stepped in front of DK Metcalf. Green’s 20-yard return put the 49ers at the Seattle 15.

Three plays later, 49ers tight end George Kittle had his second touchdown of the night for a 29-17 lead with 6:20 to go. His first covered 10 yards and his second 9.

Seattle almost got back into it with 4:39 left when Metcalf caught a 52-yard touchdown pass from Smith. However, Kenneth Walker was called for an illegal shift, nullifying the score. The Seahawks eventually scored on possession, but burned too much time. Tyler Lockett caught a 9-yard touchdown with 1:44 remaining to cut the 49ers’ lead to 29-24.

But 49ers rookie Isaac Guerendo ran 76 yards on the next play, from scrimmage to virtually all comeback hopes for the Seahawks. Guerendo slid down the field at the Seattle 5 and fullback Kyle Juszczyk scored from the 6 with 1:17 left.

Smith also threw an interception on the first drive of the game for the Seahawks, with Malik Mustapha picking it off at the 49ers 2-yard line after Seattle reached the San Francisco 25.

Laviska Shenault Jr. lost a fumble on a kickoff return in the first half, but then went 97 yards for a touchdown on a kickoff return in the second half. It was the second dynamic kickoff for a touchdown in the NFL this season.

The 49ers outscored the Seahawks 483 to 358, with Brock Purdy going 18 of 28 for 255 yards and three touchdowns. Deebo Samuel caught three for 102 yards, including a touchdown from 76 yards. Kittle caught five for 58.

Guerendo, who came in with 12 carries for 41 yards, ran for 99 yards on 10 carries after Mason injured his left shoulder late in the first half. The 49ers were already missing Christian McCaffrey, who did not play this season with bilateral Achilles tendonitis. Mason, who returned briefly in the second half, had nine carries for 73 yards.

Smith went 30-for-52 for 312 yards with one touchdown and two interceptions. Lockett had four catches for 65 yards and a touchdown, and Metcalf added three receptions for 48 yards.

The 49ers, already missing kicker Jake Moody, lost kicker Matthew Wright with 1:11 left when he made a tackle on the kickoff. Wright made field goals of 25, 41 and 35 as the 49ers went 3-for-5 in the red zone.