Answers.Body: <p>The Python solutions are nothing but wrapper for sending UCI commands to the Stockfish engine. I'm not aware there is a C++ equivalent but you can code it yourself.</p>
  <p>I don't have a copy-and-paste ready code for you. To do what you want you will need:</p>
  <ul>
  <li>Start Stockfish as a child process (or as a thread). <a href="https://www.reddit.com/r/learnprogramming/comments/q8sra3/how_do_i_make_a_uci_connect_to_my_c_gui/" rel="nofollow noreferrer">https://www.reddit.com/r/learnprogramming/comments/q8sra3/how_do_i_make_a_uci_connect_to_my_c_gui/</a></li>
  <li>Communicate with your engine appropriately (lot's of materials on Stackoverflow)</li>
  <li>Learn the <a href="https://www.wbec-ridderkerk.nl/html/UCIProtocol.html" rel="nofollow noreferrer">UCI commands</a></li>
  <li>Start a MultiPV analysis of 10</li>
  <li>Parse the results. Use a bitboard implementation to generate a FEN for each move.</li>
  </ul>
  
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Answers.Text: Is there any comprehensive documentation for UCI command?
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Body: <p>I am working on a chess player-rating system based on engine evaluations. As part of this I would like to extract evaluation data from Stockfish for the top 10 moves in a given set of positions.</p>
  <p>Ideally I would like to be able to loop this from my program, so something like:</p>
  <pre><code>while i &lt; 1000:
  #'evaluate' returns a list of top moves with their centipawn evaluations.
  choices = evaluate(positions[i]); 
  ...do stuff...
  i++;
  end while
  </code></pre>
  <p>In the above 'positions' would be a vector of chess positions in FEN format. I have looked around and there are some solutions for this using the chess library in Python, but I would really like to do this from within cpp. Is there any relatively trouble-free way to do this?</p>
  
Tags: <engines><software><stockfish><evaluation>
Title: Extract evaluation data from Stockfish in Cpp
ThreadText: # Extract evaluation data from Stockfish in Cpp
  
  (Asked by: username_0 on 2023-01-09)
  
  I am working on a chess player-rating system based on engine evaluations. As part of this I would like to extract evaluation data from Stockfish for the top 10 moves in a given set of positions.
  Ideally I would like to be able to loop this from my program, so something like:
  while i < 1000:
  #'evaluate' returns a list of top moves with their centipawn evaluations.
  choices = evaluate(positions[i]); 
  ...do stuff...
  i++;
  end while
  
  In the above 'positions' would be a vector of chess positions in FEN format. I have looked around and there are some solutions for this using the chess library in Python, but I would really like to do this from within cpp. Is there any relatively trouble-free way to do this?
  
  **Tags:** engines, software, stockfish, evaluation
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2023-01-09. Score: 2 | Accepted answer
  
  The Python solutions are nothing but wrapper for sending UCI commands to the Stockfish engine. I'm not aware there is a C++ equivalent but you can code it yourself.
  
  I don't have a copy-and-paste ready code for you. To do what you want you will need:
  
  * Start Stockfish as a child process (or as a thread). <https://www.reddit.com/r/learnprogramming/comments/q8sra3/how_do_i_make_a_uci_connect_to_my_c_gui/>
  * Communicate with your engine appropriately (lot's of materials on Stackoverflow)
  * Learn the [UCI commands](https://www.wbec-ridderkerk.nl/html/UCIProtocol.html)
  * Start a MultiPV analysis of 10
  * Parse the results. Use a bitboard implementation to generate a FEN for each move.
  
  > **Comments:**
  > **username_0**: Is there any comprehensive documentation for UCI command?  
  > **username_1**: https://www.wbec-ridderkerk.nl/html/UCIProtocol.html @username_0  
  
  ---
  
  