According to this link
http://support.chess.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=700
the free version is at an estimated strength of 2000
Members' versions are at 2200 and 2400.
Quality of free account game analysis?
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Ave,
I've recently used the opportunity of my free account to have one game analyzed per week to see if it's worth to pay for membership. I was actually disappointed, as the engine missed a two-move mate. There's a link attached: "Want more accurate game analysis? Upgrade!". My question is, how much more accurate the engine is?
The analysis is the only analysis done on my account if you need to check it, the questionable line is the proposed best move after white's 22nd move.
Jan