Please add one feature

This is a useful app. It would be the app of my dreams if we could set up our own positions, enter the correct moves, save them to a problems data base and have the program automatically load the next problem. Wow! You could enter tactics, key positions in your own repertoire, and endgame endgame positions and have all this on your phone! It would take some work to enter these positions but it would be worth it.
I would pay $50 for such an app.

Gampapa3 about Chess Opener, v4.91