Practice against oneself

I'd like to set up practice situations against myself. It appears that this is not currently possible. Is there a reason? Obviously, these should be unrated games.

There are surely more appropriate fora, as well as places to practice.

Either use a physcial board.

Or use a chess program/computer to play the situations against. Then you can set up a position and try different ways of approaching it without knowing what the opponent is thinking.