Here is the play where Boldin made the ridiculous one hand scoop catch. Perhaps more remembered for Crabs being open over the middle.
3rd Quarter - 3rd & 4
49ers: Rub concept out of bunch formation (man coverage buster)
TB: Cover 1 man
The 49ers use a bunch formation to allow a clean release from the WRs in the bunch (VD, Boldin, Crabs). In theory, this playcall will work against this coverage.
Below: The patterns the 49ers will run.
Below: TB's coverage. I placed a ? on top of two DBs and one LB (near line of scrimmage) because I am unclear what their assignment is supposed to be. That LB with the ? and Goldson (man coverage on Gore) will fake a blitz,. I assume it's man coverage based on the actions of the CB at the bottom of the screen covering Ham. He will turn and run with Ham, suggesting man coverage.
Below: The two DBs with the ?s on them are now both looking at VD. Boldin is in a physical contest with the CB. Crabs...
Below: Same moment in time as pic above. The LB that faked a blitz has removed himself from any chance of defending a throwing lane over the middle.
The play: Stacking and bunching WRs coupled with criss crossing (rub) against man coverage forces the defense to be perfect with their assignments. Or else blown coverage is created. 49ers still converted the 3rd down, but perhaps more could have been had. I think the fake blitz caused Kap to hurry his decision.
TB also used this sort of stacking/bunching, on offense, on their first 3rd down of the game which they failed to convert on. On that play (shown below), there was also confusion as to who covered who (between Brock and Whitner). (Post #144 goes into this play)