Strength of schedule is calculated from the opponents projected fantasy points allowed for the WR position. The best rating is +16 which gives the player the advantage against the defense and indicates an easy opponent, the worst rating is -16 which gives the defense the advantage and indicates a tough opponent.
Boldin should be able to duplicate last season’s numbers as he’ll build a solid rapport with Colin Kaepernick. In fact, there’s even some upside in Boldin as we actually like Kaepernick a lot more than we do Flacco.