On the other hand, if you are capable of playing big pieces very well, then play the big ones, because you do not want to get beaten by others who can play big pieces. This piano festival ended with three two-hour master classes each given by Adam, Konstantin, and myself, to selected competitors. For category 1 and 2, I agree with your strategy, but for category 3, these people need to play as big of pieces as they can assuming they play well. Most importantly, they provide pianists with an excuse to play to fellow musicians in front of a friendly jury, receive feedback, and hopefully, discover new music and musical companions. Ronald, this is my last reply about this. I knew that there were those two, and felt sure there have been others if I gave it more thought.
As of a few years ago, they didn't.
International Piano Competition for Outstanding Amateurs