Approximate Ratings of chess.com Computer Levels?

Me as white vs computer 7. Played on iphone5
Thoughts on the cpu here? :) 

So I tried level 9 on my faster computer (~3GHz instead of ~1) and it still played very badly.

The next game it got another incredibly ugly position, but it beat me with tactics (heh). Really annoying opponent, can't see how this is good for practice.

I didn't save the game, but this is what I remember:
(and after this it traded off the rooks and queens quickly...)

I feel like level 9 has some moments of 2000 level tactics, but most moves are more like 1400-1500.

It's crap

I think some solid but beatable chess engines for practice are the Irina engine (included in Lucas Chess) and the Phalanx engine, which has configurable difficulty. Phalanx is included in Scid vs PC.

I agree with those choices. Irina in Lucas Chess is really just a personality that uses the Amyan 1.62 engine. (Amyan 1.72 is the latest version.)

Level 7 would probably be 1400 max because I can beat it on a computer. It can't be 1700 or 1600, because it would destroy me then.

You can't determine performance by clock speed. Architecture affects it more these days. On my computer when I play Level 9 it doesn't make positional errors like that.

Other than positional errors, it dropped a pawn on move 4... there's no such thing as a modern program that couldn't see this extremely quickly. I think the code must force it to play poorly at random times.

Other times I've spent 5 minutes calculating a long tactic, and after I move it defends against it after thinking for ~5 seconds.

Okay, so, final answer:

-There's no way to estimate the ratings level of any computer-chess levels on this site.

-Performance depends HEAVILY on your machine's local performance.

-On anything but the highest levels (depending on local performance), the kinds of errors made by the computer are rather peculiar relative to the kinds of errors that humans make.

-Efforts to assign ratings relative to levels, so far, have been haphazard guesswork.

I'm rated ~1500 and I tried level 6. It was extremely difficult for me. I lost 3 games in a row and in the forth game I managed to get a draw by repetition (after 70+ moves).

Also, the Avg. Diff of the computer was around ~20 centipawns, so that level 6 is 1650-1750 ELO or even higher. At least that's the case in my computer.

Computer Level 9 is the toughest engine I have ever been able to beat.

Well......I would consider myself about an 1800 player, but i beat computer level 8 on my second try.

Im here rated 1150 rapid, blitz 900 but i play many times drunk and lose 15 games in a row. About equal to rapid 1200-1300 players when playing seriously.

With my computer i can beat level 5 EASILY like thinking 1-2 secs per move mostly so it plays like here 800 rated on 3+2 time control. Level 6 I can beat easily when I think a bit but level 7 I have never won I think. Sometimes had a bit better (winning) endgames but it's always managed to draw (I think ive lost patience to think). Level 8 I have no chance against. 

But I have run through many known master games with level 10 and it always finds the best moves in any situation. So I think it plays (far?) better than any human with classical time controls. 

So what's about some people saying it plays well on level 6 when mine plays definitely poorly up til 6 and it cant be about computer cause 10 plays very accurately. 

It is somewhat dependent on the computer you use. The chess.com computer only searches for a certain amount of time so the stronger the computer, the stronger the program in general. I use a desktop, and for me Level 5 plays like the 1200-1300 rated players I face in Rapid (for the most part; some do play a lot better than that though).

Yeah I get that but my point is that level 10 with my computer plays very accurately with the time it thinks (not always thinks the max time) and level 5 plays all moves immediately so i'd guess it's programmed to play so poorly that my computer is powerful enough for level 5 to make all moves immediately cause it doesnt ever calculate that deep and thus it wouldnt be dependent on computer.

I'd say level 6 plays like 1200-1300 rapid (so without much thinking i sometimes win, sometimes lose if i make some blunders. but level 5 definitely i win easily playing blitz style 

Level 5 is really weak. More time is spent on implementing intentional mistakes than actual correct calculation. Level 10 plays like a GM. Level 9 plays like a ~2000 rated player on my computer.

So that's what I thought. If you have computer power above a certain limit (very basic laptop is enough) it plays the same way for everyone. And I cant beat level 7, here's my game today. I think ~1600 seems reasonable cause i could beat it some times if i concentrated well up til the end