Also known as: "Revolutionary"

It is said that "The study is in the right hand and the revolution is in the left.."

Karasowski said that this etude was composed during Chopin's stay in Stuttgart, being inspired by the capture of Warsaw by the Russians, which took place on September 8, 1831.

This etude is a reversal of the technical demands of No. 8. The intens drama and passion in this etude is expressed in the right-hand melody in full chords, and the rolling turbulent passages in the left hand.

Niecks wrote: "The composer seems to be fuming with rage: the left hand rushes impetuously along and the right hand strikes in with passionate ejaculations."

Kullak calls it a "bravura study of the very highest order for the left hand".

The most celebrated stunt of pianist Alexander Dreyschock was to play the single left-hand passages in octaves.