A stretto is heard in measure 52 based on the second fugal theme. In the accompaniment, a variation of the first fugue theme is played in stretto. The movement is a fugue which follows the stretto principle from the start and throughout. They are strictly contrapuntal, and include real answers; occasionally the points of imitation use stretto. Twice every season they clash in the "Derby dello Stretto" (Strait of Messina Derby). Stretto co-authored parts of it. Only one entry of the subject must be heard in its completion in a "stretto". The theme is then stated again, this time in stretto between upper and lower voices. Stretto and parallel entries may be employed, with particular emphasis on the latter. A condensed version, called Alfabeto Stretto, is also used for long names that wouldn't fit. The subject is heard in stretto in m. 55, and again densely so in mm.