Alright, so here is a Gdim7 chord. A diminished 7 chord contains the root, b3rd,b 5th, and bb7th (6th) degrees of the scale. In this case, in the key of G, we have the notes G, Bb, Db, and Fb (E). You take your second finger, your middle finger, and put it on the 3rd fret of the 6th string, you then bar across the 4th string, 3rd string, and 2nd string, on the 2nd fret. In addition, you then need to take your ring finger, your third . . .
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