I'm not nearly good enough to play a master, and I use lichess to play Chess960 (Fischer Random). Can ICC do that?
Edit: The ICC app does seem to have Chess960. However I couldn't tell where my offer went in free mode, and the UI was filled with stuff I couldn't use. Lichess's UX seems slicker. In particular:
a) When you open the app you get a problem. Solve it and you get another, and another and another.
b) You can ask for computer analysis after a game.