whatever its origins, the conception of the newly composed allegro matches that of the five other fugal last movements as well as the symmetry of the opening allegro. the opening ritornello section is 30 bars long. after the statement of the three-bar fugue subject in the violin, it is taken up in the upper harpsichord part with the semiquaver counter subject in the violin. it is then heard in the bass with the counter-theme in the upper harpsichord. at bar 14 the fugue develops with an inverted version of the opening motif in the violin in counterpoint with semiquaver figures in the left hand of the harpsichord with responses in the right hand.