I read an article recently about Liszts transcendental studies and one of the points it raised was that part of the challenge (for concert pianists) of playing them is deciding which parts of the piece you cannot play satisfactorily and how you can cover this up. He said that pianists have to accept that some parts just have to be "fudged" and that it is a given fact when you play them. I'm curious, does anyone know which parts these would be? I realise it might differ from pianist to pianist but I would be very interested to hear your thoughts on this.
(By the way I cant find the article again but I will continue to search for it in order that you can see the exact phrasing of the point)