What are your difficult passages?

Bach Chromatic fantasy, in the fugue bars 55-59 and 103-106. 

Rach Sonata 2 (1931) 3rd mvmt Presto up to the beginning of the cascade (which looks hard but isn't so bad). I can do separate hands but coordinating both hands at tempo is very difficult for me especially the four RH runs which are 3-2 with the left hand.

Chopin nocturne d flat. The lengthy fioritura. 

I started the aeolian harp etude by chopin. I’m finding it quite tough.  Although I’m using lots of arm and wrist movement it still feels like my hands and fingers are stretched and tense. I have quite small hands and short stubby fingers

Hommage a Rameau.  Not the showy bits.  Just these three escalating chords.  There just seems to be no way to play them without disrupting the surface of the pond. 

Liszt Spanish Rhapsody Difficulties 
(1) In the Molto vivace section, I found the Interlocking octaves challenging to play evenly (wrist relaxation) and without missing notes. When try to play leapings and switching between Staccatissmo and marcato, l tend to rush after the chords.
(2)  I found the Arpeggio Octaves both similar and contrary motion difficult to play (wrist relaxation) and challenging to play evenly and without missing notes. 
(3)  I found the wide leaps with left hand leaps in contrary motion difficult to play them accurately.
(4)  P.12 - P.13 Semiquaver triplets (Wrist moving), Accuracy and relaxation, coordination with left hand chords
(5)  P.15 and P.18 - P.19 Double notes with single notes (Wrist moving), I have adpoted your suggested fingerings and allocated some notes to the left hand.  It definitely helps ease the burden a lot :). However, I tend to build up tensions when I play the whole passage and it  becomes difficult to maintain coordination(and to not miss notes).

Here, it's memorizing Debussys preludes book 1: (...Voiles) and (...le vent dans la plaine). 

Not really difficult, but so rewarding to (finally) spend time memorizing (for an exam) because I always have trouble memorizing piano music while I can sing and conduct hours of choral music as a choral singer/conductor. But now my piano small grey cells are growing and this is very motivating for me!!

Difficult passage: In (...le vent dans la plaine) the E flat minor 6 downward right hand chord, and the crazy leaps in the middle of the piece - explosions! Practise slowly. 

chopin etude op.25 no. 11

Dominic, re trills: I listened to your webcast of August 17, 2021 on trills. Wow! A phenomenal amount of knowledge you shared! As per your suggestion, I’d like your opinion on how many trills to play per measure, starting with ms 65 of Paderewski’s Menuet, Opus 14, #1. And especially how to coordinate the left hand’s 4-notes on beats 2 and 3 of measure 66, etc. Thank you. 

Great topic!  I'm currently working on Beethoven 109.  The 2 spots giving me the most trouble are in the 3rd movement:  1) Variation III - getting the some of the left hand up to tempo perfectly (I made the mistake of changing the fingering several times.  Ugh...)  and 2) Variation VI - playing the section with triplets and trills in both hands (beginning in the 12th measure) up to tempo accurately.  Otherwise loving the piece.