...And still other weird moveable chords found in modern electric blues tunes:

starting at the fifth fret play open fifth string A; G (4th string, 5th fret); C# (3rd string, 6th fret); F# and B (ring finger makes a mini-barre across the bottom two strings at the 7th fret)...I mash my index and middle fingers across all the strings below - it seems easier to make this chord this way than trying to note each individual string, and it doesn't affect the mini-barre at the 7th fret...don't know what this one is called either, but this "bastard A" can be moved up two frets to make a "bastard B", and you can reach around with your thumb and catch B on the sixth string at the 7th fret(and not playing the open A string) ....move this mess up to the 12th fret and you have a "bastard E" playing open E sixth string or noted at the 12th fret again with your thumb (again not playing the open A string)... "bastards" E-A-B make for a "bastard" I-IV-V progression...

Minor sixths sometimes show up in the classier blues tunes. Here's a moveable (inverted?) minor sixth, starting at the nut, Gm6: A#(fifth string, 1st fret); E (fourth string, 2nd fret);A#,D,G (mini-barre made with the ring finger at the 3rd fret across the bottom three strings). Moveable up and down the neck...

Bored rhythm players must invent these twisted chords while comping behind some white hot guitar solos....