Watch the More Chord Applications online guitar lesson by TrueFire from Play Blues Guitar 8: Advanced Rhythm Principles
More Chord Applications - Chords: Demo is a video guitar lesson presented by Robben Ford and is sourced from Blues Revolution.
Robben demonstrates how to use a diminished chord to move from the IV chord back to the I chord. In the key of A for example, he shows how to take the top 4 notes of the D9 chord, and lower the 9th (E) to Eb to arrive at the D# dim7 chord (F#-C-D#-A), which leads very smoothly back to the A chord.
Moving voicings of the diminished chord up or down by minor 3rds can lead to many other voicings of the I chord across the neck.