I have experience the same!
Chess.com evaluation accuracy not accurate?
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I just play my phone so it's not a big deal, but I'm pretty sure I've found at least one move that I consider something the engine can't see (I think three actually, but can only recollect the one). At move 29 (if I can get the thing to work) engine blasts this move and I think it's very nice. The rest of my game could probs be destroyed by most of you, but this match still had lots of very fun positions.
Jul 21, 2020
0
#4
It's not super accurate. Here is an example:
The engine evaluates this at +3.94, but it is drawn
UppityEelChesskid wrote:
It's not super accurate. Here is an example:
The engine evaluates this at +3.94, but it is drawn
😀
Jul 23, 2020
0
#6
All engines will do that, they just think that white has the material advantage so it gives white +3.94. Many drawn positions have that evaluation until a couple moves are played and the engine thinks again.
UppityEelChesskid wrote:
It's not super accurate. Here is an example:
The engine evaluates this at +3.94, but it is drawn
This is because majority of programmers intentionally left " Fortress Detection Code" from Stockfish beacuse adding such code will make 1.8% slower to Stockfish , causing approx 3.5 elo loss.
In real life, such fortress happens 1 in milllion or 1 in billion of game, it is a waste of engine resources to detect fortress. 0.00 within 0 second
There are many Stockfish forks (e.g crystals ) can detect such fortress immediately.
As modern day chess engines are extremely fine tunned and extremely fast, knowing such fortress practically harm the performance and it is generally regard as useless.
Jul 23, 2020
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#8
EnergeticHay wrote:
All engines will do that, they just think that white has the material advantage so it gives white +3.94. Many drawn positions have that evaluation until a couple moves are played and the engine thinks again.
This engine (Stockfish 10) stays at +3.94 ish until 30-40 moves in!
Jul 23, 2020
0
#9
https://www.chess.com/a/2QPEUpXTLawaW
I used the lines that Depth 18 Stockfish 10 suggested and it didn't lower the evals until move 40!
I just played a game vs computer on level 5 - chess.com says my accuracy was 58%. I find that strange, since out of 52 moves it only rated 6 as 'inaccurate' and one as a 'mistake'.
The rest - 45 moves - was 'by the book' (two moves) or marked ok (22 were 'best'). With so many 'good moves' - how is it possible to still get that low accuracy?
I have also found other (which I believe are) errors with the chess.com evaluation. Especially when using the mbile app.