What is the true —Elo— level of Chess Titans?

I’m not a very strong player (~1000 Elo), but even so, I can consistently beat Chess Titans at levels 1–6. At level 7, I win about 1 out of 4 games, and levels 8–10 are unbeatable for me.

A friend of mine (~1750 Elo) played against level 9 and lost badly, down a full queen!

I’ve noticed Chess Titans has a less positional and more materialistic style of play. It often places its pieces on bad squares in exchange for extra material (and usually maintains that advantage). So its biggest weakness is failing to protect its king properly. I assume that, being a computer, it handles tactics exceptionally well but struggles with long-term planning.

I know this might be a tired topic, but what’s the chess.com Elo rating equivalent for each difficulty level of Chess Titans? What rating do I need to beat level 10?

Here's my personal estimation:

Yeah, I realize this needs to be more precise. I'm open to help! ;D