How PFF graded Purdy, 49ers in frustrating loss to Dolphins

There were a few notable performances in the 49ers' 29-17 loss to the Miami Dolphins, but those were outweighed by the mistakes, which were very evident in the team's PFF grades. Wide receiver Deebo Samuel and tight end George Kittle both had standout performances in the disappointing loss, a game that was in reach until midway through the fourth quarter, but 11 penalties for 90 yards was too much to overcome in Sunday's game. The effect of the penalties might have been most evident on the 49ers' first drive of the third quarter, when quarterback Brock Purdy and the offense drove down the field to the Miami 2-yard line, only to have Samuel's 16-yard reception and run negated by an illegal formation penalty committed by wide receiver Ricky Pearsall. The offense was unable to recoup the lost yards, and the ensuing field-goal attempt by kicker Jake Moody went wide-left. "No matter what's going on, when you have those penalties like that, you don't deserve to win," Kyle Shanahan said after the game. "The offense, the biggest thing was the lack of concentration. "The defense, three drives where you have a personal foul on all three of those drives. I think two of them ended up in...