What We Found for E
The fret number can be viewed as the the 3 finger [the root on string 4] or the 2 finger [5th on string 5].
Memorize the names for these chords in each position.
B type chords B Major, B5, Bm, BMaj7, B7, B(♭6), Bsus9, Bm7.
Resources: Harmonic Palette • Flat Major Sub System If we look at this group of chords through the lens of C Major, we can describe some of them as non-diatonic chords in two main classes: flat Majors and secondary Dominants.
We can use a piece of the E chord shape as a basis to build 11 other chords [we can also use the entire E shape]. The piece we are using is the root and the 5th of the chord, played together. We take a piece of E [6 and 5 strings], move the shape onto the board, and now it's movable to 11 other locations. These shapes are sometimes referred to as 'power chords'. This shape also works down a string level - 5 & 4 strings. These would be R5s based on the A form. The roots will be in different places however [think 5-0 tuning - the A5 in P5 for E, starts the cycle on the A string]. And, the shape works again on the 4 & 3 strings - these would be based on the D form.