Are there any higher level guides?

[Bob]

I've always wondered, but I've never seen them.  There are repertoire guides with pieces according to difficulty.  So maybe that's it.  But is there anything like a curriculum, guide, whatever beyond a beginning or intermediate level?

[martinn]

Google RCM Piano syllabus or ABRSM Piano syllabus. Those include a bit of what is required. I have a few  Alfred piano methods that go quite far.
I am learning  Exploring Piano Classics By Nancy Bachus and Masterwork Classics, Ed. Jane Magrath. They are great, and I like the approach and both have Technique /Technical skills accompanying books.
Then a more advanced student has to google Piano technique book, or something like that.

[martinn]

Then there is Lang Lang: Mastering the Piano. I will soon start those as well.

[lelle]

Cortot's Rational Principles of Pianoforte Technique has a multiple page long list of repertoire that he thinks is indispensable to study and what type/degree of difficulties you'll encounter. It covers major composers from the baroque to late romantic repertoire (ending with Brahms/Franck).