It’s up over at Grantland:
A key reason for this is that Harbaugh has made the passing game easier for Smith, particularly when it comes to beating the blitz. Of course, coaches often say they are “simplifying the playbook,” but Harbaugh has been able to do it coherently and in a way that actually aids his quarterback’s ability to succeed rather than simply removes options.
One reason for this is that many NFL plays simply duplicate each other; you only need so many ways to throw the same pass to the flat or run off tackle. You might as well perfect the plays you have rather than keep adding new ones every week. But Harbaugh has also changed the entire theory behind how Smith and his offense approach the blitz, and this is where Smith’s greatest improvement has come. That’s because Harbaugh eliminated “sight adjustments” from the 49ers playbook. Indeed, this change has been so successful that, according to Pro Football Focus, Smith’s completion percentage, quarterback rating, average yards per attempt, and touchdown-to-interception ratio against blitzes have all been much better than Smith’s historical averages, but also better than his performance on all other downs.
Read the whole thing. Video diagrams after the jump (and in the article).