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  3. Why is my move a blunder, the analysis suggested best move is a blunder for sure!

The game analysis says my move was a blunder but i can't see how. To make things worse the suggested best move is to take the bishop but it ends there, there are no more moves suggested which is also odd.

Anyway my question to you all is how is my move (highlighted in red) a blunder or even a mistake? The suggested move would be a massive blunder, why would i sacrifice a queen for a bishop, can anyone see the benefit of this suggestion or even why my move is deemed as a blunder.

Here is a screenshot of the analysis and moves: http://prntscr.com/m5xp0x

Thank you.

has this been posted i can only cancel or reply so cant see if my question is in forum so scared to press cancel. I will remove this reply if i can but dont want to hit cancel and it not post the question. sorry
EDIT: I CANT REMOVE THE REPLY, SORRY THERE IS NO DELETE OPTION.

lol
after Qxa6 (you win a bishop)
and black plays Rxa6 (you lose a queen for a bishop)
you can play xd6 and win the queen back (you are now 1 bishop ahead)

you would have won the bishop
12 Qxa6 Rxa6
13 ed
winning back the queen with a bishop to spare.

But you're right to question the computer. Especially in unbalanced positions it suggests you to be a piece down for example with no prospects (no pieces left) instead of say a rook down but with dynamics.

Good luck!

Qe3 is a blunder because you must take the free bishop, then if he takes your queen (Rxa6) you take his queen (exd6).

Its queen was under attack by your pawn, and it moved the bishop to attack your queen. If you take the bishop, it can either take your queen with the rook or retreat its own queen. If it doesn't take the queen, you have 2 bishops, whereas it would have 1. If it takes your queen, you would both have zero queens, but you would have 1 more bishop. The computer will always favor having more pieces.

@nuffsed81 as everyone has pointed out taking the bishop is correct. It's a good idea to practice basic tactical ideas like this if you aren't comfortable with it - doing Lichess puzzles can be helpful.

Thanks i do appreciate the advice mate but this is something that i would of seen 99% of the time. My P was attacking its Q, my mind was just on other things it must of been. I dont understand. I have just beet the machine at level 1 which is 1350, but i often lose to players 1000ish. The last machine game i won, and the analysis graph shows the white (computer) was never at an advantage apart from when we were both opening. As soon as the mid game started i had massive advantage for the entire game. Plus the advantage was huge, the graph was all black! The machine seems to be about 900 not 1350.

Anyway thanks for the advice, i do practice and use the puzzles and features that this site offers. They are very helpful, using the checkmate practice i have stopped stalmateing, which happened all too often and is very frustrating, and winning with CM. So the practice features are very helpful for sure.

Thanks

It's important to realize that the Lichess analysis is classifying things as "blunders", "mistakes", or "inaccuracies" purely on the difference between the evaluation of the move played and the evaluation of the best move. So it called your move a blunder simply because the evaluation difference was above whatever its threshold is for calling things blunders. There is nothing deeper, like some kind of AI that classifies errors or something like that.