This seventh chord shape requires a larger stretch by the 4th finger so many guitarists prefer to use the 2nd finger instead of the 3rd when playing seventh rock chords.
A7 Rock Chord
D7 Rock Chord
Play the following examples using these seventh chord shapes.
Incorporate exercise 202 into other major chord progressions you have learned, e.g., play a 12 Bar Blues in the key of A using root 6 rock chords for A and root 5 rock chords for D and E.