|6||x or G||3rd fretfr.||optionalopt.|
Chord C11 notes: (G), C, F, Bb, D and G.
This chord is played by placing a barre on fret three with your index finger. The note G on the sixth string is not required, but can be played on the 3rd fret if needed.
Observation: the C11 (C dominant 11th) chord should include a 3rd, but it is often omitted - transforming it into a simple C9sus4 or C9sus.
1(C), 3(E), 5(G), b7(A#/Bb), 9(D), 11(F).