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C C9 #11 G G9 #11 G G9 #11 2
→Notes on Voicing
! Chord !! R !! M3 !! P5 !! m7 !! M9 !! A11
|-
! C{{supSharp9}}{{11s}}11
| C || '''E''' || '''G''' || B{{b}} || D || F{{s}}
|-
! G{{supSharp9}}{{11s}}11
| '''G''' || '''B''' || '''D''' || F || '''A''' || C{{s}}
|}
For C{{supSharp9}}{{11s}}11, the E and G are bolded because these notes can be played using open strings. For G{{supSharp9}}{{11s}}11, G, B, D, and A can be played on open strings. Let's find a way to play it. We'll start by adding the open strings, then trying to find the other notes. For the G{{supSharp9}}{{11s}}11, using the open A and G strings inverts the chord. For root position, we won't be able to use all the open strings, but we can still take advantage of some of them.
E o|-|-|-|-| F ||i|-|-|-| F ||i|-|-|-|
F# |-|-|m|-| B o||-|-|-|-| C# ||-|m|-|-|
5
That C{{supSharp9}}{{11s}} 11 still a bit difficult, but if we omit the D (9th), it becomes a very simple voicing. For the G{{supSharp9}}{{11s}}11, the chord shape above is pretty easy to play and includes all 6 notes of the chord. Unfortunately, the A11 and P5 are in the same octave, creating a m2 interval. Hence, the G{{supSharp9}}{{11s}} 11 voicing 2, which avoids any m2 intervals but drops the B (M3) of the chord.
Extended chords generally apply to Jazz, in which guitar is often accompanied by bass and/or piano. This means the guitar may not be responsible for supplying every note of the chord. For instance, the bass may play the root note (or other bass note for an inversion). This allows the guitar to omit this note from the chord. Piano can take this even further, allowing the guitar to play as little as 2 notes of the chord.