THE ONE FRET PER FINGER RULE.               In the world of classical guitar playing the concept where each finger on the left hand should be responsible for every string on that fret, a fret space for every finger, so the left hand can cover four frets, and the finger board is covered in three hand positions.      Hand positions in the begining will require practice as the fourth finger will be very important as the student advances, but will become easier in time.         The guitar is one of the few instruments where it is possible to play the same note in more than one position, therefore finding the best position to use is important when learning a new piece or arrangement.     By using the one fret per finger rule playing a melody line will usually be easier as each finger moves to cover a new fret, first position covers frets 1 to 4, second position covers frets 5 to 8 and third covers frets 9 to 12 . Have a go at this and let us know how you get on.  Talk soon, stay Classy ..