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Beck was sacked 10 times by a Buffalo defense that entered the game with four sacks on the season. Against San Francisco last week, he failed to recognize open receivers at times, Shanahan acknowledged. Washington was shut out against Buffalo and scored only 11 points against the 49ers.

“Obviously you’re going to evaluate [a] player week by week on how he handles himself in every type of situation,” Shanahan said Monday. “Then you’re taking a look at the shuffling pieces that go within the system. Sometimes it’s a little bit harder to evaluate a guy when we’re moving a few people around.”

So how does he distinguish which problems are caused by Beck and which result from the backups?

“It’s not always easy,” he said, “but it’s part of your job to make those decisions based on past experience.”