Above all, Chopin was the greatest master of counterpoint since Mozart. This will appear paradoxical only if we equate counterpoint with strict fugue, and Chopin wrote no formal fugues except as an academic exercise. His chief training, in both composition and keyboard playing, however, came from a study of Bach, and it was a study that engaged him all his life and which he always recommended to his pupils.

Ch. 5 : Chopin: Counterpoint and the Narrative Forms - The Romantic Generation (1995)