Seahawks smother 49ers in key early-season showdown, 29-3 SEATTLE - Richard Sherman celebrated by dancing with cheerleaders, Marshawn Lynch cut, plowed and walked his way to three touchdowns and Pete Carroll got one rousing birthday gift - a 29-3 victory for his Seattle Seahawks in their NFC West showdown with the San Francisco 49ers. Lynch scored on runs of 14 and two yards and also on a seven-yard reception. Seattle flustered Colin Kaepernick into his worst passing game as a starter, intercepting three of his passes. And the Seahawks dominated in a game delayed for 60 minutes late in the first quarter because of thunderstorms. Lynch finished with 135 total yards, including 98 rushing, to lift his team on a night when quarterback Russell Wilson and his receivers struggled. Lynch's touchdown run on the first drive of the second half gave Seattle a 12-0 lead, and his scoring catch made it 19-3 early in the fourth quarter. The game was marked by careless turnovers and unneeded penalties. But that was expected between these nasty rivals, favorites not just in their division but as potential NFC representatives in the Super Bowl. And it was the Seahawks getting an early, important advantage over the 49ers. Kaepernick failed to get anything going in the pass game, unable to break down Seattle's stellar secondary. Earl Thomas intercepted a deflected pass in the end zone in the first quarter, ending what proved to be the only time the 49ers threatened to score a touchdown. Kam Chancellor intercepted Kaepernick midway through the fourth quarter, setting up Lynch's third touchdown. Then there was Sherman, Seattle's ultra-confident All-Pro, who picked off Kaepernick's deep sideline pass with about 13 minutes remaining. He celebrated his first interception of the season by dancing with the Seahawks cheer squad after the play, which set up a field goal.