Smash Flood concept. I think CHI is in some sort of soft Cover1. They drop 8 into coverage and rush 3. Might be some distorted Cover6.
49ers will pull Tiller to help sell the playaction.
The blue CB is playing over the top on Torrey, but with plenty of time due to only 3 rushers, Gabbert will wait for the routes to fully develop.
Boldin's route is designed to go deep enough so that if CHI was in Quarters, which they might be if this is Cover6, then red will consider Boldin as "vertical", and will match Boldin in man coverage. Once Boldin pulls up on the Curl, it will draw red forward, leaving the sidelines for Torrey to work.
The blue CB still has not turned his hips upfield to run with Torrey and looks flat footed. This is the moment right before Gabbert starts his windup. Gabbert sees the positioning of the blue CB and will start his windup.
The middle safety was defending the deep middle of the field in case Torrey ran a Post, while depending on the blue CB to cover any outside breaking route. For whatever reason, the blue CB just stops running with Torrey. Perhaps because he saw Boldin pull up.
gg Bears