Answers.Body: <p>Bf8, while a nice positional move, an excellent idea for a 1200 rated player, is a mistake as Nxe4 wins an important central pawn for no compensation. The Queen can't recapture due to the coming skewer down the long diagonal. See the lines below.</p>
  <p>Remember tactics always trump strategy!</p>
  <pre><code>[White &quot;&quot;]
  [Black &quot;&quot;]
  [FEN &quot;1k1rr3/1bpqbp2/ppnp1n1p/6p1/3NP1P1/P3Q1BP/1PP1NP2/2KR1B1R b - - 0 1&quot;]
  
  1...Nxe4 2.Nxc6+ 
      ( 2.Qxe4 Nxd4 3.Qxd4 Bxh1 )
  2...Qxc6 *
  </code></pre>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-02-10T09:17:56.480Z
Answers.Text: Thanks, but usually this kind of ignorances are called "Mistake", "Inaccuracy" or "Missed win" in chess.com right? Why the term "Blunder"?
Answers.UserDisplayName: brownser
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-02-10T10:00:55.633Z
Answers.Text: The computer is not very good at distinguishing such "human" terms, it can solely look at the numbers it calculates, and here the difference between nxe4 and bf8 is
   big enough to trigger it to use "blunder". But I agree, for a new player blunder is s bit strong. But the computer doesn't and can't "think" like that
Answers.UserDisplayName: Ian Bush
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-02-10T07:58:01.963Z
Answers.LastActivityDate: 2021-02-10T07:58:01.963Z
Answers.UserDisplayName: Ian Bush
Body: <p>Here is an analysis of a game I played recently in Chess.com app.  I won this match in move 19 as the opponent resigned.</p>
  <p>Please see the image attached for the position. On move 16, after White captured the pawn on d4 with his Knight, I moved my bishop back to f8 from e7. This move opened the rook on e file and caused a double attack on the e4 pawn.</p>
  <p>But the chess.com analysis marked this as a blunder, can anyone explain why?</p>
  <p><a href="https://i.sstatic.net/ociN8.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ociN8.png" alt="This is the position at move 16" /></a></p>
  <p>Thanks for the people who explained about the pawn capture move, but my doubt is : usually this kind of ignorances are called &quot;Mistake&quot;, &quot;Inaccuracy&quot; or &quot;Missed win&quot; in chess.com right? Why the term &quot;Blunder&quot;?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-02-09T21:44:35.643Z
Comments.Text: Looks like black wins a pawn as 16 ... Nxe4 17 Qxe4 can be met by 17 ... Nxd4 18 Qxd4 Bxh1
Comments.UserDisplayName: Ian Bush
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-02-10T08:11:50.130Z
Comments.Text: Click on the magnifier icon next to the move, and let the engine explain.
Comments.UserDisplayName: RemcoGerlich
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-02-10T11:43:35.400Z
Comments.Text: Computers are bad at distinguishing types of mistakes. It's a blunder because you go from a winning position to an equal-ish one
Comments.UserDisplayName: David
Tags: <analysis><stockfish><blunder><chess.com>
Title: Why is Bf8 a blunder in this position?
ThreadText: # Why is Bf8 a blunder in this position?
  
  (Asked by: username_0 on 2021-02-09)
  
  Here is an analysis of a game I played recently in Chess.com app. I won this match in move 19 as the opponent resigned.
  
  Please see the image attached for the position. On move 16, after White captured the pawn on d4 with his Knight, I moved my bishop back to f8 from e7. This move opened the rook on e file and caused a double attack on the e4 pawn.
  
  But the chess.com analysis marked this as a blunder, can anyone explain why?
  
  [![This is the position at move 16](https://i.sstatic.net/ociN8.png)](https://i.sstatic.net/ociN8.png)
  
  Thanks for the people who explained about the pawn capture move, but my doubt is : usually this kind of ignorances are called "Mistake", "Inaccuracy" or "Missed win" in chess.com right? Why the term "Blunder"?
  
  **Tags:** analysis, stockfish, blunder, chess.com
  
  > **Comments:**
  > **username_1**: Looks like black wins a pawn as 16 ... Nxe4 17 Qxe4 can be met by 17 ... Nxd4 18 Qxd4 Bxh1  
  > **username_2**: Click on the magnifier icon next to the move, and let the engine explain.  
  > **username_3**: Computers are bad at distinguishing types of mistakes. It's a blunder because you go from a winning position to an equal-ish one  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2021-02-10. Score: 7 | Accepted answer
  
  Bf8, while a nice positional move, an excellent idea for a 1200 rated player, is a mistake as Nxe4 wins an important central pawn for no compensation. The Queen can't recapture due to the coming skewer down the long diagonal. See the lines below.
  Remember tactics always trump strategy!
  [White ""]
  [Black ""]
  [FEN "1k1rr3/1bpqbp2/ppnp1n1p/6p1/3NP1P1/P3Q1BP/1PP1NP2/2KR1B1R b - - 0 1"]
  
  1...Nxe4 2.Nxc6+ 
      ( 2.Qxe4 Nxd4 3.Qxd4 Bxh1 )
  2...Qxc6 *
  
  > **Comments:**
  > **username_0**: Thanks, but usually this kind of ignorances are called "Mistake", "Inaccuracy" or "Missed win" in chess.com right? Why the term "Blunder"?  
  > **username_1**: The computer is not very good at distinguishing such "human" terms, it can solely look at the numbers it calculates, and here the difference between nxe4 and bf8 is  big enough to trigger it to use "blunder". But I agree, for a new player blunder is s bit strong. But the computer doesn't and can't "think" like that  
  
  ---
  
  