Alkan's Op. 10 comprises etudes inspired by Chopin, pushing the boundaries of pianistic technique. These works are characterized by their immense difficulty, dramatic scope, and often macabre or virtuosic character.
Requires exceptional left-hand agility and endurance to navigate the rapid, independent figurations.
2 Concerti da Camera (Op.10) is rated Henle level 9 of 9 — virtuoso repertoire, roughly concert / virtuoso level. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 9 — meaning you can already play level 8–9 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
2 Concerti da Camera (Op.10) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.