please add a needed feature

I like your app, it good to learn playing blindfold chess but on my opinion it doesnt have a feature that paid version should have.
- If I am playing a blindfold chess and I am a beginner I can do some stupid moves and let my piece to die forgetting that opponents piece is there. And such things are pity because the opponent sees the board. It would be good to have ability to create a private game where my friend who plays blindfold chess on another device and knows my password would find me and join my game.
- if that is not possible because of the server, please add at least a game where I and my friend would play blindfold chess on the same board on one device. So device will only control that the piece is there and move is legal.

Hunter panther about Noir Chess: Trainer with ICC and FICS Client, v1.1.2