Root 6 chord shapes

The box on the left shows the root 6 major chord shape, the one on the right
is the root 6 minor shape. The chord name is taken from the position at which the shape
is played on the fret board. As an example if the shape is played at the 3rd fret.
The chord is a G. If it is played at the 7th fret the chord is a B etc.

Using that same model, the following sequence of illustrations
define the various 7th shapes.

They are as follows

Major 7 shape                                           Dominant 7 shape                                      Minor 7 shape

The first shape is the major 7. When comparing with the root six major shape above.
The root note on the D string has been dropped by one fret. The note below that is the 7th
note in the scale. Thus the chord becomes the major 7th.

The second shape is the dominant 7th . When making the comparison with the root six major shape
above the root note on the D string has been dropped by two notes. This note on the scale falls
between the 6th and 7th notes and is counted as a flattened or minor 7th note.
This chord becomes the dominant 7th.

The third shape is the minor 7th. When making the comparison with the root six minor shape
above, the Root note on the D string has been dropped by two notes. This note as with the dominant
scale is the flattened or minor 7th. This chord becomes the minor 7th.