arrau's book 'on music and performance' - says on pg 107 or thereabouts that he practiced 14 hours a day on mazeppa. one neighbor gave him a bill because he had to go to a nerve sanitorium. arrau's mother - after certain number of hours - would politely ask him if he could practice something else.
Krause used to have me stay away from the piano for at least a month in the summer, so as not to get stale, and I still do it quite often.[/b] Then when I go back to the piano its really an event.(David Dubal The World of the Concert Pianist Victor Gollancz p. 31 - my highlight)
So the idea is to use much force on those thirds to make them more solid and then use less force in performance? I practiced today and found that slow simple practicing with a metronome, and practicing the thirds in all dynamic levels from pp to ff helped and I think I'll be fine. Thanks to all who spoke.By the way, Bernhard, do you have a link to a post about overcoming "difficult passages"?