Strength of schedule is calculated from the opponents projected fantasy points allowed for the DEF 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.
It wasn't that long ago that the San Francisco 49ers were considered the NFL's best defensive team. Of course, former head coach Jim Harbaugh is now in Michigan. Defensive coordinator Vic Fangio? In Chicago with the Bears. Linebackers Patrick Willis and Chris Borland (at 24) have retired, and the 49ers are trying to convince defensive end Justin Smith to not follow them out the door. In short, a defense that was once overflowing with talent is now overflowing with question marks. And those question marks extend to fantasy football.