which extended chords are used in the blues

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https://www.justinguitar.com/guitar-lessons/blues-chord-extensions-bl-206

Blues Chord Extensions | JustinGuitar.com
https://www.justinguitar.com/guitar-lessons/blues-chord-extensions-bl-206
We’re looking at three 9th chord grips and three 13th chord grips which are very usable and you should be able to start mixing them in right away. They may sound a little jazz at first but with a solid backbeat drum groove that flavour fades and they just sound blues.

https://theminorplanetsmusic.com/chord-construction-in-blues/

Chord Construction in Blues: Different Types of Chords …
https://theminorplanetsmusic.com/chord-construction-in-blues/
The construction of extended chords in blues The extended chord family includes 9ths, 11ths, and 13ths, and like seventh chords, extended chords can be major, minor, or dominant in quality. A 9th chord is a seventh chord with a major 9th interval (i.e., the scale’s 2nd raised an octave) stacked on top.

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Blues Guitar Chords – Comprehensive Blues Chord Chart
www.fretjam.com/blues-guitar-chords.html
The two main barre chord forms used in blues are the E and A form (or shape). These chords are so called as they are rooted on the E and A strings respectively. You can use either of these positions for the 1, 4 or 5 chords in a blues progression, but it’s most common to use the E form for the 1 chord and the A form for the 4 and 5 chords.

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Extended Chords& Different Types & How They’re Formed 7,9 …
musictheorysite.com/extended-chords/
Additionally, when playing a standard twelve bar bluesprogression it’s quite common to use a dominant 7 for all chords in the progression. The non-extended diatonic V triad is called the dominant chord, which is where the dominant7th gets it’s name. 9th Chords Now it’s time to get even more extended.

https://www.hearandplay.com/main/blues-music-scales-chords-and-chord-progressions

A Lesson On Blues Music Scales, Chords, And Chord …

A Lesson On Blues Music Scales, Chords, And Chord Progressions

Sixth chords are used in blues music. A sixth chord is formed by adding the sixth tone of the scale to a major or minor triad. Therefore, adding a sixth tone to any given major triad produces a major sixth chord. Adding a sixth tone to the each of the primary triads produces sixth chords.

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12 Bar Blues Explained, Common Chords and Improvising …
musictheorysite.com/12-bar-blues/
12 bar blues is one of the most popular chord progressions and is most notably used in blues songs but, since most popular music today came from the blues, is also widely used in other genres of music.

https://musiciantuts.com/blues-chords/

12 Beautiful Blues Chords You Need to Learn – Chord Chart …
https://musiciantuts.com/blues-chords/
That being said, true blues chords aren’t restricted to just 7th chords, many times 9ths and 13ths are also used to provide that bluesy sound. There are a ton of possibilities and variations to blues chords. You can add certain notes to an existing blues chord to give it more flavour, you can change the key, etc.

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Blues Chord Progressions – 12, 8 and 16 Bar Examples
www.fretjam.com/blues-chord-progressions.html
Many guitarists just use open chords or barre chords in their blues progressions. Remember also, for heavier blues styles, power chords are often used in place of full blown 7th chords. Minor Key Blues. Minor key blues uses exactly the same 1 4 5 root relationship from earlier, but with minor chords instead of major/dominant 7th. Simply change …

https://www.practical-chords-and-harmony.com/extended-chords.html

Extended Chords – 7ths, 9ths, 11ths, 13ths
https://www.practical-chords-and-harmony.com/extended-chords.html
7th – 9th – 11th – 13th. Extended chords (or higher numbered chords) have notes in addition to the basic triad. These are called extensions… i.e. 7th, 9th, 11th, 13th.. Here are the basic guidelines regarding extended chords:

https://en.wikipedia.org/wiki/Extended_chord

Extended chord – Wikipedia
https://en.wikipedia.org/wiki/Extended_chord
In music, extended chords are certian chords (built from thirds) or triads with notes extended, or added, beyond the seventh. Ninth, eleventh, and thirteenth chords are extended chords. The thirteenth is the farthest extension diatonically possible as, by that point, all seven tonal degrees are represented within the chord (the next extension, the fifteenth, is the same as the root of the chord).