new site feature proposal: Position Analysis

By feature I mean something simalar to solo chess on mobile, something fun to do that can still improve your playing.

A player would be given a position generated by a computer or from a real game. It would not be an endgame or opening position. No context and no previous moves shown. The position would not be a mate in x moves.

It would display: With White to move, who has an advantage in this position? The player would have to look at material, tactical, and strategic advantages to determine who has an advantage, who is winning, or if the position is even.

To submit your answer, you can type a number into the analysis bar, such as: 0.76 (white is slightly better), -2.44 (black is winning), or 8.23 (white has a overwhelming advantage)

Once you have answered, it will display how close you were to the actual computer analysis of the position.

This feature should have a rating system, much like puzzles. Positions would also be rated based on how difficult and advanced they are.

I think it sounds very fun, considering I thought of the concept out of nowhere. I also wonder how hard it would be to collect thousands and even millions of positions and also generate some. 

What do you think of this idea?