To play the Gdim7 chord, place the index finger on the 1st fret of the C-string and middle finger on the 1st fret of the bottom A-string. Let the other strings ring open.
The Gdim7 chord contains the notes G-Bb-Db-E.
To build a Gdim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the G major scale (G, A, B, C, D, E, F#). 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 F major scale which are G-Bb-Db-E.
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