Watch the RiffSolo 9 online guitar lesson by Matthieu Brandt from Jump Blues
This one flies through a few different blues positions, connecting them with some real jump blues licks.
The standard riff and it's variations are ideal licks to move back and forth from one position to the other. Some of these positions are great for blues licks, but can be kinda difficult to play standard riffs or mixolydian scales in.
The second blues position is one of those trickier ones. There are some good swing notes in there, but sometimes you have to reach for them.