If you look at the following diagrams, you will notice that only one shape is required to play all twelve possible augmented chords. This is because the augmented chord is a symmetrical chord which means that any of the notes in the chord can be the root note. Therefore, each augmented chord has three possible names. There are really only four augmented chords, each one having at least three names. They can all be played by forming an augmented chord and then moving the shape up the neck one fret at a time. After the fourth chord you get back to a repeat of the first one.
C+
Db+
D+
Eb+
E+
Fb+
F+
G+
Ab+
A+
Bb+
B+
There are two types of diminished chords which are often interchangeable. Those shown here contain three notes (triads). The other type is the diminished 7th chord. It contains four notes and is demonstrated in the next section. The following shapes show diminished triads as open chord shapes.