Nader, some of your explanation is unintelligible, but I have tried to interpret it accurately: The barre is formed by extending the index or first finger across the strings on the fretboard immediately behind a fret-- all six strings (full bar) or 5, 4 or 3 strings (half barre) and… If the index finger covers all six strings (full bar), the index finger is deployed in three segments : the tip (for the lower strings), the middle, and the base of the finger (for the higher strings) . Differences in hand length will affect the extension of the barre . For example, the middle joint will chang e its position across the strings according to the length of the hand.
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