To play the Cdim7 chord, place the index finger on the 2nd fret of the top g-string, ring finger on the 3rd fret of the C-string, middle finger on the 2nd fret of the E-string, and little finger on the 3rd fret of the bottom A-string.
The Cdim7 chord contains the notes C-Eb-Gb-A.
To build a Cdim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the C major scale (C, D, E, F, G, A, B). The "bb7" indicates a double flat seventh, meaning you lower the seventh scale degree two half steps.
Identify the first, flat third, flat fifth, and double flat seventh scale degrees in the C major scale which are C-Eb-Gb-A.
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