Answers.Body: <p>The engine is giving you an answer. Black plays <strong>... Na5</strong> followed by <strong>... Nc4</strong> which prevents White from bringing pieces over to the queenside, because of the White doubled pawns on c2 and c3. Which means the White king is now stranded by itself on the queenside.</p>
  <p>Black is going to play <strong>... c5</strong> and bring the queen out to a5 or b6. On a5 it threatens <strong>... Qxa3</strong> with mate to follow. On b6 it's threatening <strong>... Qb2</strong> with mate.</p>
  <p>What queenside castling has done is to put the White king into the line of fire, in a way that Black has at least two pieces converging to attack, and White has none. Even, if by miracle, White gets some pieces over to the a- and b-files, Black's other pieces will enter the fray much quicker and in much larger numbers: The a8 rook by pushing the a-pawn, the c8-bishop via d7.</p>
  <p>The chess engine reckons White is going to lose at least a rook to stave off this attack (this is simply the difference between the position evaluation after queenside castling -6.27 versus the best move Nf3 which is evaluated to -1.74).</p>
  <p>In logical terms, you castled into an attack on the queenside. With the centre as constricted as it is, your king was fairly safe remaining in the centre uncastled for the time being. You needed to develop the Knight to f3, and the bishop to e2, and take it from there.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-12-22T10:38:46.347Z
Answers.Text: Qd6 may be an even quicker way to bring the queen in - and note that after Na5 the computer wants to play Qb5 to get at least one defender the other side of the "wall" on c2 and c3.
Answers.UserDisplayName: Ian Bush
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-12-22T09:54:53.703Z
Answers.LastActivityDate: 2020-12-22T09:54:53.703Z
Answers.UserDisplayName: MikeD
Body: <p>I am back at chess after two years and am enjoying it a lot. I was playing and this happened after I checked a report at <a href="https://chess.com" rel="nofollow noreferrer">chess.com</a>:</p>
  <p><a href="https://i.sstatic.net/6d5hu.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/6d5hu.png" alt="Screenshot showing that O-O-O is a -6.27 mistake" /></a></p>
  <p>I have googled the importance of when to castle the king. Here I know castling isn't the best move, but why is it a mistake?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-12-23T00:04:40.633Z
Comments.Text: The engine is giving some lines but as an idea, your king is much, much less safe in the queenside than on the center
Comments.UserDisplayName: David
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-12-23T05:45:14.690Z
Comments.Text: @David Totally Agreed!
Comments.UserDisplayName: Ibnelaiq
Tags: <castling>
Title: Why is castling here a mistake?
ThreadText: # Why is castling here a mistake?
  
  (Asked by: username_0 on 2020-12-22)
  
  I am back at chess after two years and am enjoying it a lot. I was playing and this happened after I checked a report at [chess.com](https://chess.com):
  
  [![Screenshot showing that O-O-O is a -6.27 mistake](https://i.sstatic.net/6d5hu.png)](https://i.sstatic.net/6d5hu.png)
  
  I have googled the importance of when to castle the king. Here I know castling isn't the best move, but why is it a mistake?
  
  **Tags:** castling
  
  > **Comments:**
  > **username_1**: The engine is giving some lines but as an idea, your king is much, much less safe in the queenside than on the center  
  > **username_0**: @username_1 Totally Agreed!  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2020-12-22. Score: 12 | Accepted answer
  
  The engine is giving you an answer. Black plays **... Na5** followed by **... Nc4** which prevents White from bringing pieces over to the queenside, because of the White doubled pawns on c2 and c3. Which means the White king is now stranded by itself on the queenside.
  
  Black is going to play **... c5** and bring the queen out to a5 or b6. On a5 it threatens **... Qxa3** with mate to follow. On b6 it's threatening **... Qb2** with mate.
  
  What queenside castling has done is to put the White king into the line of fire, in a way that Black has at least two pieces converging to attack, and White has none. Even, if by miracle, White gets some pieces over to the a- and b-files, Black's other pieces will enter the fray much quicker and in much larger numbers: The a8 rook by pushing the a-pawn, the c8-bishop via d7.
  
  The chess engine reckons White is going to lose at least a rook to stave off this attack (this is simply the difference between the position evaluation after queenside castling -6.27 versus the best move Nf3 which is evaluated to -1.74).
  
  In logical terms, you castled into an attack on the queenside. With the centre as constricted as it is, your king was fairly safe remaining in the centre uncastled for the time being. You needed to develop the Knight to f3, and the bishop to e2, and take it from there.
  
  > **Comments:**
  > **username_3**: Qd6 may be an even quicker way to bring the queen in - and note that after Na5 the computer wants to play Qb5 to get at least one defender the other side of the "wall" on c2 and c3.  
  
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