From Sports Illustrated : http://nfl.si.com/2013/09/12/anquan-boldin-san-francisco-49ers-baltimore-ravens/
Kaepernick's 22-yard pass to Boldin with 13:26 left in the third quarter of the Packers game was another case of Boldin beating coverage with formation diversity on a deep route. This looks a bit like Boldin's deep-right catch in the Super Bowl, without the random element. It was motion to bunch, with Vernon Davis motioning to and back out of the combo, receiver Kyle Williams at the top of the stack and Boldin outside. The interesting thing about this play was that while Davis and Williams each took away one defender with their routes, Boldin hit the zone covered by the cornerback and the safety — and he made the catch anyway. This was an outstanding example of Boldin's most obvious and valuable skill — the ability to be a productive and consistent receiver even when he's covered by two or more defenders. Nobody in the NFL is better at making contested catches. Adding Matthews (in the box) spying Kaepernick, and you have a combo that is just about impossible to defend.