SANTA CLARA – The San Francisco 49ers just lost 12-6 to the Los Angeles Rams. Here are the 49ers’ grades for this performance.

QUARTERBACK: F

It was one of the biggest games of Brock Purdy’s career and also one of his worst. With the season on the line and against a defense that gave up 42 points last week, Purdy completed 45 percent of his passes, averaged just 4.5 yards per throw attempt and kept the game on the line, he threw an interception in the red Zone. He collapsed under the pressure of the moment. And he can’t blame the rain. He just played badly. He threw a deep pass to George Kittle that should have been a touchdown. He missed a long throw to Ricky Pearsall that should have been a touchdown. And he airmailed a deep pass intended for Jauan Jennings that was intercepted. In Purdy’s last 18 starts, his quarterback rating is 91 and his win-loss record is 9-9. The league caught up with him. The 49ers better not give him more than $35 million per season. And they better draft a quarterback.

RUNNING BACKS: C

Isaac Guerendo wasn’t spectacular, but Rams running back Kyren Williams wasn’t spectacular either. However, both ran hard. The difference is that the Rams ran the ball 38 times and the 49ers only 19 times. That means McVay held on to the ball in a close game while Shanahan gave it up. More on Shanahan in a minute.

Full-back: F

I ran around a lot but never touched the ball.

WIDE RECEIVER: F

Jauan Jennings only caught two of nine targets – he wasn’t a factor. Ricky Pearsall caught a pass and was wide open for another, but Purdy missed it. It’s a shame the 49ers didn’t throw to Pearsall more often. Instead, they threw seven passes to Deebo Samuel, of which he caught just three, gained 16 yards through the air and had one touchdown catch. That means it was a typical game for him. He can’t be on this team next season.

TIGHT ENDS: B

George Kittle had 7 goals – the same number as Samuel. The difference is Kittle gained 61 yards. If only some of Samuel’s goals had gone to Kittle.

OFFENSIVE LINEMEN: C

They gave up three sacks and didn’t create much running room.

DEFENSIVE LINEMEN: D

They defended the run well until the fourth quarter, but they never sacked Matthew Stafford.

LINEBACKER: A-MINUS

Fred Warner finished with a whopping 15 tackles. Dre Greenlaw scored eight points in the first half alone – he was phenomenal in his first game back from a torn Achilles tendon. But he injured his knee in the second half and left the game, and the 49ers turned to De’Vondre Campbell to replace him. Unfortunately for the 49ers, Campbell refused to play, forcing them to finish the game with only two linebackers, which is a big reason why the 49ers were unable to stop the run in the fourth quarter. The 49ers will almost certainly cut Campbell. Looking back, he should never have been on the team. And he’s a symbol of the 49ers’ larger problems this season. They have a lot of new faces that have never met.

DEFENSIVE BACKS: A-MINUS

They only allowed 160 yards and zero touchdown passes, so you can’t blame them for the loss. Still, they dropped a few potential interceptions that could have swung the game in the 49ers’ favor.

SPECIAL TEAMS: B-PLUS

Jake Moody made both field goal attempts – he was locked up. But this group also committed two illegal formation penalties.

Coach: F

Kyle Shanahan seemed more interested in appeasing Deebo Samuel than winning the game. From moment one, the entire game plan revolved around Samuel, only because he complained on social media this week about not getting enough ball. Shanahan rewarded Samuel’s bad behavior, and Samuel responded with another terrible performance. The 49ers have lost so many games this year simply because they made too many plays for Samuel. That’s basically how they lost the Super Bowl. He had 11 targets and just 3 catches in that game. Shanahan is a Deebo enabler. And with the game on the line, one of Shanahan’s players backed him and the team. Meanwhile, no one left Sean McVay today. His team was together while the 49ers were not. And while Shanahan scored 19 runs and 31 passes, McVay scored 34 runs and 31 passes. McVay isn’t the best coach of all time, but he’s clearly better than Shanahan, who was absolutely terrible this season. If he isn’t willing to release Deebo Samuel, the 49ers will have to get rid of both of them. They are a thing of the past.