Sorry I mistyped, I meant to say the reverse. There are about 10 measures that a pianist won't be able to play. And they're the places where it looks as if you randomly stuck octaves in places that would sound good, not in places where it would be idiomatic for a virtuosic pianist to play, and only in the left hand. A pianist just won't be able to play the octaves in m. 34, 35, 36, 37, 45, 48, 152, 154, 161, and 164. The octaves and huge chords a pianist would have to roll rather than play straight like that, with leaping arpeggios, are highly unnatural for a pianist. If you want to write something difficult for a pianist that are natural for him to play, I'd suggest taking a look at the scores of Liszt's Transcendent Etudes and Chopin's Etudes and looking at the score to Rachmaninoff's Piano Concertos rather than just writing it blindly.