Blunder ?

In this position, i played the second best computer move, but for Stockfish it's a Blunder.
The best move is at my level extremly difficult to find, the Queen attacks the Bishop and if the Bishop takes the Rook, there is Check Mate in 5 moves nearly impossible to find in a 10 minutes game.
In 2024, is there a tool to evaluate the difficulty to find a move ?

Yes @MagiciansGambit It's called er' brain / noggin' but don't let it convince you that you cannot find the better move as you can at times 7 do but other times it doesn't find it . Just don't cut erself down as your 'level' can go up

best known method to find difficulty of a move is to compare how deep search engine needs to to find correct move. It has short comings. Most obvious one is that engine will always even at 1-move level look forcing sequences to end see if they alter the evaluation. So it may find 5-move mate in 1-ply search.

Anyway blunder is a move that loses a lot. Whether if was possible to find or not by reasonable effort.

@petri999 said in #3:
> Anyway blunder is a move that loses a lot. Whether if was possible to find or not by reasonable effort.
Exactly that!

And rather than being sad about the evaluation of your move, you should look at the position and ask yourself why you didn't spot the better alternatives. Would you rather have the computer analysis to tell you: "All is well, no need to see this good move"? Stockfish is a bad tool to give consolation. But you could use it to spot such opportunities in future games.

As far as the description "blunder" is concerned, the computer is looking at the difference between the score +6, which could have been achieved, and the actual evaluation +1.3 of the move played.
Unfortunately, we humans miss a great deal of opportunities that stockfish sees. Expert commentators have to admit that some lines, as suggested by their chess analysis software, just wouldn't occur even to the minds of GMs.

@Davelz said in #5:
> As far as the description "blunder" is concerned, the computer is looking at the difference between the score +6, which could have been achieved, and the actual evaluation +1.3 of the move played.
It's a bit more complicated: the evaluation translates to "winning chances" on the scale from 0 (no way) to 1 (sure win) and a move is marked as a blunder if it reduces player's winning chances by 0.3 or more. This means that if you are winning or losing too clearly, even hanging a rook or a queen may not be marked as a blunder because it does not harm your winning chances enough (and once your winning chances are below 0.3, there is in fact no way play a "blunder"). On the other hand, much more innocuous move may be marked as a blunder when the evaluation is around 0.

Haha