Answers.Body: <p>The knight is going to have an amazing square on d5 so it's a great idea to trade it before that can happen. Probably an oversight by the author (specially if the book was written before the computer era). Black's position is lost either way so probably not much attention was given to this spot.</p>
  
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Answers.Text: Specifically, after Nd5 followed by Nxf6+, gxf6+ is forced due to the back rank. Add a ruined kingside to the minus pawn. (Yet I'm surprised that it's already +3 after Bxc3.)
Answers.UserDisplayName: Hauke Reddmann
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Answers.CreationDate: 2021-11-28T21:37:14.150Z
Answers.Text: @HaukeReddmann thanks for the explanation. btw "it's already +3 after Bxc3" -- what does "+3" mean?
Answers.UserDisplayName: athos
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Answers.Text: @athos He's referring to Stockfish's evaluation
Answers.UserDisplayName: David
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Answers.CreationDate: 2021-11-29T16:39:51.380Z
Answers.Text: @HaukeReddmann Maybe "gxf6" is sufficient :)
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Body: <p>I’m reading a book saying that now black Knight at b4 is under attack so need move away.</p>
  <p><a href="https://i.sstatic.net/GUSl9.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/GUSl9.png" alt="enter image description here" /></a></p>
  <p>However Stockfish app suggests take the white c3 Knight first using f6 Bishop , then black will Rcxc3 take the Bishop, the white can Nc6 move Knight away.</p>
  <p>So, is there some reason to do this Bishop-Knight exchange before Nc6? Or I’m not using Stockfish properly?</p>
  
Tags: <analysis>
Title: Why this exchange
ThreadText: # Why this exchange
  
  (Asked by: username_0 on 2021-11-27)
  
  I’m reading a book saying that now black Knight at b4 is under attack so need move away.
  
  [![enter image description here](https://i.sstatic.net/GUSl9.png)](https://i.sstatic.net/GUSl9.png)
  
  However Stockfish app suggests take the white c3 Knight first using f6 Bishop , then black will Rcxc3 take the Bishop, the white can Nc6 move Knight away.
  
  So, is there some reason to do this Bishop-Knight exchange before Nc6? Or I’m not using Stockfish properly?
  
  **Tags:** analysis
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2021-11-27. Score: 6 | Accepted answer
  
  The knight is going to have an amazing square on d5 so it's a great idea to trade it before that can happen. Probably an oversight by the author (specially if the book was written before the computer era). Black's position is lost either way so probably not much attention was given to this spot.
  
  > **Comments:**
  > **username_2**: Specifically, after Nd5 followed by Nxf6+, gxf6+ is forced due to the back rank. Add a ruined kingside to the minus pawn. (Yet I'm surprised that it's already +3 after Bxc3.)  
  > **username_0**: @HaukeReddmann thanks for the explanation. btw "it's already +3 after Bxc3" -- what does "+3" mean?  
  > **username_1**: @username_0 He's referring to Stockfish's evaluation  
  > **username_3**: @HaukeReddmann Maybe "gxf6" is sufficient :)  
  
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