Answers.Body: <p>Also keep in mind that the rook isn't necessarily being sacrificed free and clear, because taking back on f1 is a possibility (if not playing Ne6+ right away), meaning white is only sacrificing the exchange, while trading queens and leaving the black king exposed and vulnerable and unable to castle, so it's not as costly.</p>
  
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Answers.Text: I thought that using "sacrifice" could refer to sacrificing the exchange in addition to just plain sacrifices.
Answers.UserDisplayName: chackerian
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Answers.Text: @chackerian It could, but "rook sacrifice", as you write in the title, refers to sacrificing the rook.
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Answers.UserDisplayName: Curtis
Answers.Body: <p>i'm No pro but I think that after:</p>
  
  <p>Nf4 Bxf1<br/>
  Qxd8 Kxd8 [Queen Trade]<br/>
  Ne6+</p>
  
  <p>wherever the king goes black is in a poor position<br/>
  Ke7/Ke8 is followed by Nc7<br/><br/>
  Kd7 is perhaps black's best bet. But even in this case the kin is vulnerable to a discovered check by the white squared bishop.<br/><br/>
  Kc8 leaves black in a poor position.The black king is blocking his own rook</p>
  
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Body: <pre><code>[fen "rn1qk1nr/pp4p1/2p2p2/4P2p/1bp5/2NbPPP1/PP2N1BP/R1BQ1RK1 w kq - 1 11"]
  </code></pre>
  
  <p>Komodo 8 and Stockfish agree on Nf4 here for white ( sacrificing the rook for development). It does not however show Bxf1 next for black but instead fxe5 and then Nxd3. Why shouldn't black just take the rook instead of fxe5. I get that after white swaps queens black will not be able to castle but wouldn't this still be worth it materially?</p>
  
Tags: <engines><stockfish>
Title: Reasoning for Rook sacrifice
ThreadText: # Reasoning for Rook sacrifice
  
  (Asked by: username_0 on 2016-06-03)
  
  [fen "rn1qk1nr/pp4p1/2p2p2/4P2p/1bp5/2NbPPP1/PP2N1BP/R1BQ1RK1 w kq - 1 11"]
  
  Komodo 8 and Stockfish agree on Nf4 here for white ( sacrificing the rook for development). It does not however show Bxf1 next for black but instead fxe5 and then Nxd3. Why shouldn't black just take the rook instead of fxe5. I get that after white swaps queens black will not be able to castle but wouldn't this still be worth it materially?
  
  **Tags:** engines, stockfish
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2016-06-03. Score: 4 | Accepted answer
  
  Also keep in mind that the rook isn't necessarily being sacrificed free and clear, because taking back on f1 is a possibility (if not playing Ne6+ right away), meaning white is only sacrificing the exchange, while trading queens and leaving the black king exposed and vulnerable and unable to castle, so it's not as costly.
  
  > **Comments:**
  > **username_0**: I thought that using "sacrifice" could refer to sacrificing the exchange in addition to just plain sacrifices.  
  > **username_2**: @username_0 It could, but "rook sacrifice", as you write in the title, refers to sacrificing the rook.  
  
  ---
  
  ### Answer by username_3 on 2016-06-03. Score: 1
  
  i'm No pro but I think that after:
  
  Nf4 Bxf1  
  Qxd8 Kxd8 [Queen Trade]  
  Ne6+
  
  wherever the king goes black is in a poor position  
  Ke7/Ke8 is followed by Nc7  
    
  Kd7 is perhaps black's best bet. But even in this case the kin is vulnerable to a discovered check by the white squared bishop.  
    
  Kc8 leaves black in a poor position.The black king is blocking his own rook
  
  
  ---
  
  