Hrqls: Yes, you set the playing strength at Settings/Players. Just click on expert and select World Class. You can do this for both chequer play and cube decisions. Then do the same under Settings/Analysis and Settings/Evaluation. Experiment a bit if you like and when you're happy click on Settings/Save settings. Otherwise next time you run it, you'll be back where you started.
1-ply is a compromise between speed and ability. Just don't trust it too much.
(hide) If you are interested in a progress of a tournament you are playing, you can discuss it with your opponents at this tournament's discussion board. (HelenaTanein) (show all tips)