Diminished Chord Shapes for Guitar (Fingers + Scale Degrees)

To Include or Not to Include the Optional Note

Dashed notes indicate optional tones that can be omitted without affecting the chord's function or core sound. These are either tones duplicated in another octave, non-guide tones, or non-primary color tones.

I recommend playing the chord without them first and really listening to how it sounds, then adding them only if you like what you hear and they serve the sound you're going for.

Why I introduced them?

• Reduces the number of diagrams—one optional note would otherwise be split into 2 diagrams, two would result in 4 diagrams and so on.
• Makes it easier to see similarities between shapes when they're superimposed

Here are some scenarios where you might choose to include them or leave them out—these aren't pros and cons, just different situations you might find yourself in.

Scenarios when you would want to include:

• It makes that particular chord shape easier to play with the optional note included rather than omitted.
• You want the fuller, richer sound that comes from adding the inessential tone.
• You like it when you can strum the chord with the pick rather than fingerpick around string skips.

Scenarios when you would not want to include:

• You want to reduce note density and let the chord breathe, creating more space in the sound.
• You want to separate the bass from the chord-defining tones.
• You need a specific top voice for voice-leading to the next chord, and adding another note on top would change that (the opposite is also actually true—you might want to include it for the very same reason).
• You want to omit inessential tone(s) to highlight the main color of the chord—in other words, to add definition and emphasize your original intent.
• Including it makes the chord harder—or even impossible—to play for your current situation (hand size, finger limitations, injury, etc.).

Another goal I aimed for with these optional notes was practicality—you can add any of them without changing your hand position or rearranging your fingers. If a shape includes an optional note, it means you either have a free finger available to fret it, or you can easily bring it in with a simple barre.

Diatonic Vs Non-Diatonic—What Does It Mean?

This chart includes non-diatonic chords. I know this term can feel confusing at first, so I want to explain the difference between them in this section as simple as possible without heavy theory.

There are usually two ways we use the word diatonic, depending on context:

1. Can the chord be built only from the notes of a Major scale (including its modes)?
2. Can the chord be built only from the notes of a specific scale?

In the first case, we often say things like "Cmaj7 is a diatonic chord" without naming a scale. In the second case, you might see something like "CminMaj7 is diatonic to the Melodic Minor scale".

In both of these cases you get an answer to the question "is this chord compatible with scale X?", or "does this chord naturally exist in scale X?". When you learn that the answer is "yes", then you know you can use this chord as a substitute for some other chord in that harmonic environment. For example, a minor 11th chord is a diatonic chord, which means you can use it as a smooth substitute for a minor 7th chord, and it will fit your musical context without breaking the sound.

Now let's put the contrast side by side:

• Diatonic—all chords come from the Major scale, so they can be used freely in progressions based on either the Major or the related Minor scale.
• Non-diatonic—chords that are not found in the Major scale. Using them in a Major or Minor progression will introduce "outside" notes that may sound unexpected or tense.

If the word diatonic is used as described in the second scenario, then the contrast I outlined above still applies—you just replace the Major scale with the specific scale in question, such as Melodic Minor.

However, there are no strict rules here, this is just theory. It doesn't mean you cannot use non-diatonic chord in a diatonic context—you absolutely can. Just trust your ears: if it sounds good, it works.

Here's a shocking example you might not think about :) The natural Minor scale that we all love and use has one "weak spot"—it has a minor chord on its dominant V scale degree which creates a softer, less convincing resolution back to the tonic. Because of that, musicians often replace it with a major V chord to strengthen the pull back home. That major V is technically non-diatonic, since it introduces notes outside the scale—but it sounds great and more functional in practice, so we use it all the time.

One thing to watch out for is that even if a chord is diatonic to a specific scale, it doesn't automatically mean it works on every scale degree. Recall that the way we get chords from a scale is by stacking thirds on each degree of the scale, so their position matters. For example, a major 11th chord on built on degree I doesn't imply you can freely move it to degree IV. That needs to be checked manually in a respective reference for that scale.

I hope this clarified the distinction between these two terms. The key point is this: these labels don't describe whether a chord is good or bad, common or rare. It's there to help you quickly understand whether it's compatible with the scale of your interest.

Chord Intervals Reference

The handy table below shows the chord extension depth, how each level can be modified, and the symbols used for each alteration.

Note that these are not scale degrees, but chord notation as used in chord symbols such as 7sus4 or maj7#11. For example, the symbol "7" here represents a minor 7th interval, whereas as a scale degree it would correspond to a major 7th.

The "Dominant" column shows a full stack of thirds that forms an extended dominant chord reaching all the way up to the 13th. It serves as our reference point. When you raise or lower any of these tones, that alteration gets a symbol which you can see to the left and right of this column.

Just to clarify: this chart itself isn't specifically about dominant chord alterations—it applies to all chord types. It's just that the unaltered symbols (1,3,5,7, etc.) define the dominant chord structure and serve as the baseline.

Think of the leftmost column as the extension level (or depth).

Relationship Between Scale Degrees and Intervals