BrieflyOp.10N.1 is about arpeggio and broken chordsN.2 focus is mostly on chromatic melodiesN.3 focus is on melodic rendition and sixthsN.4 focus is on hands independence and alternationN.5 focus is on black keys playing and hand positions and irregular rhythmic groupsN.6 focus in on melodic rendition and counterpointN.7 focus is on sixths and thirdsN.8 focus in scales and arpeggiosN.9 focus in on stretches, octaves and large intervalsN.10 focus is on rhythmic challenges N.11 focus in on wide arpeggios N.12 focus is mostly power and octaves
Doesn't 10-7 also cover repeated notes with 1-2 fingering?Also, I believe 10-12 is an etude for the LH, focusing on scalar movement.As for Op.25, I only know a few for sure:No.1- Broken chordsNo.2- Polyrhythm of 6 on 3No.3-No.4- Staccato, LH jumpsNo.5-No.6- RH thirds- scalar and chormatic minor 3rdsNo.7-No.8- RH sixthsNo.9-No.10- OctavesNo.11-No.12- Hand shifting, I think.Phil
https://en.wikipedia.org/wiki/Chopin_etudes
As helpful as that is, I don't find it really specific or conclusive. For example, 10-5, 10-12, 25-2 and 25-11 are all listed as 'Velocity' etudes, but think about how different those etudes are. They all have different challenges and goals for the player. 10-5 and 25-11 are more pattern-oriented, 10-12 and 25-2 are more scale-like, 10-12 is a LH etude, and 25-2 is also a polyrhythm etude.Phil