user32968: I've been trying to get back into chess a bit, and noticed the option to practice certain positions - but I've been puzzled by the rating when playing a "Friendly" game (which gives you feedback for your moves).
During practice, the move that's considered "excellent" is considered an "inaccuracy" in the exact same game against a computer.
I'm not sure about chess notation, I'll try to supply pictures.
The position I reach as black is this one, trying to figure out my next best move:
Ruy López Opening: Morphy Defense, Caro Variation, 5.Bb3

If I practice this position (here), Bishop to b5 is rated as "good"

But if I do the exact same move in my own game, it's rated as "inaccuracy"

The ratings also seem fairly different (+0.99 vs +0.39). What am I missing here? Is this move good, or inaccurate? Why do I get two fairly different responses for the exact same game position - does it rate differently according to the opponents Elo rating? Or am I missing something obvious?

user27380: This is very likely due to a different engine search depth.
The same effect occurs on lichess, when you request an engine analysis after the game directly vs. when you copy it into a lichess study first. Games in studies are analyzed deeper and engine evaluations can differ.
Chess.com typically uses pretty low depth (e.g. 18). When analyzing moves live on chess.com, I have noticed that annotations also sometimes change when replaying the move, suggesting that the position has been calculated deeper, necessitating a change in evaluation.

32968: <p>I've been trying to get back into chess a bit, and noticed the option to practice certain positions - but I've been puzzled by the rating when playing a &quot;Friendly&quot; game (which gives you feedback for your moves).</p>
<p>During practice, the move that's considered &quot;excellent&quot; is considered an &quot;inaccuracy&quot; in the exact same game against a computer.</p>
<p>I'm not sure about chess notation, I'll try to supply pictures.</p>
<p>The position I reach as black is this one, trying to figure out my next best move:</p>
<p><a href="https://www.chess.com/openings/Ruy-Lopez-Opening-Morphy-Defense-Caro-Variation-5.Bb3" rel="nofollow noreferrer">Ruy López Opening: Morphy Defense, Caro Variation, 5.Bb3</a></p>
<p><a href="https://i.stack.imgur.com/yGUW8.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yGUW8.jpg" alt="enter image description here" /></a></p>
<p>If I practice this position (<a href="https://www.chess.com/practice/custom?fen=r1bqkbnr/2pp1ppp/p1n5/1p2p3/4P3/1B3N2/PPPP1PPP/RNBQK2R%20b%20KQkq%20-%202%205" rel="nofollow noreferrer">here</a>), Bishop to b5 is rated as &quot;good&quot;</p>
<p><a href="https://i.stack.imgur.com/zBYbk.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zBYbk.jpg" alt="enter image description here" /></a></p>
<p>But if I do the exact same move in my own game, it's rated as &quot;inaccuracy&quot;</p>
<p><a href="https://i.stack.imgur.com/tRaLG.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tRaLG.jpg" alt="enter image description here" /></a></p>
<p>The ratings also seem fairly different (+0.99 vs +0.39). What am I missing here? Is this move good, or inaccurate? Why do I get two fairly different responses for the exact same game position - does it rate differently according to the opponents Elo rating? Or am I missing something obvious?</p>
 27380: <p>This is very likely due to a different engine search depth.
The same effect occurs on lichess, when you request an engine analysis after the game directly vs. when you copy it into a lichess study first. Games in studies are analyzed deeper and engine evaluations can differ.
Chess.com typically uses pretty low depth (e.g. 18). When analyzing moves live on chess.com, I have noticed that annotations also sometimes change when replaying the move, suggesting that the position has been calculated deeper, necessitating a change in evaluation.</p>
