Watch the Tickle the... Rosewood? online guitar lesson by Brad Carlton from Chord Studies: Slow Blues Progressions Vol. 1
This example is a twelve bar blues in the key of G. What we have here are some close voicings, meaning the tones of the chords are close together the way a piano player would typically voice the chords. This is a challenge to replicate on the guitar, but that's what we have here, and it makes for a good exercise in stretching out your fretting hand. Keep your fretting hand relaxed, and also watch your intonation as you stretch for those notes.