Solutions concerning technique and interpretation
Chopin - Etude in C-sharp minor, op. 10 n° 4
Measures 3, 7, 11 etc...
The red notes, eighth notes in Chopin’s text, are often overlooked by negligent pianists who play only sixteenth notes. One can even find on YouTube a so-called “pedagogic” recording that omits them! But they are very helpful... on a technical level - Chopin knew exactly what he wanted to write.