MIAMI GARDENS, Fla. — The defending NFC champion San Francisco 49ers were eliminated from the playoffs before their game at Miami began on Sunday because of victories by Washington and the Los Angeles Rams.
Then they couldn't play the role of spoiler, losing 29-17 and keeping the Dolphins' slim playoff hopes alive.
The 49ers (6-9) became the 16th team to miss the postseason after losing the previous Super Bowl. They fell 25-22 to the Kansas City Chiefs in Super Bowl 58 on Feb. 11.
San Francisco's fate was sealed during a stretch of four losses in five games leading into Sunday. Coach Kyle Shanahan did not know about the team being eliminated until after the loss to Miami.
''I wasn't aware of that but it did nothing with the game,'' Shanahan said. ''We kind of had that thought last week. It wasn't official but we understand numbers.''
Among the numbers that spelled San Francisco's doom on Sunday: 11 penalties for 90 yards. The Niners were flagged three times for unsportsmanlike conduct and twice on pre-snap penalties.
The Niners had the ball at their 47 while trailing 22-17 at the two-minute warning, but Miami cornerback Kader Kohu intercepted Brock Purdy. Three plays later, De'Von Achane's 50-yard touchdown run secured the win for the Dolphins.
''I just feel like we're hurting ourselves offensively and then when the defense gets a stop, we've got to go and capitalize,'' Purdy said. ''Last year we did that really well.''