Answers.Body: <p>It's very unlikely you'll be able to compare opening books just by playing against them. Main lines will be approximately same in all books, what you really want to see is how "wide" these books are, do they contain only a few main lines, or plenty of variations as well.</p>
  
  <p>The easiest way to do that would be to convert the books back to the readable (PGN?) format and see how many different games are included for a particular opening.</p>
  
  <p>Might be easier to do that using some software than comparing by hand. Even better if the software can read the books directly, this way you don't lose any information while converting books to .PGN format, but you'll have to be able to program for that to happen, because I don't know any ready-to-use software for the books comparison.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-06-28T17:19:59.060Z
Answers.LastActivityDate: 2019-04-18T07:43:02.073Z
Answers.LastEditDate: 2019-04-18T07:43:02.073Z
Answers.UserDisplayName: lenik
Body: <p>I'm trying to evaluate the differences between Opening books.</p>
  <p>For example: Have Fritz 12 Book and Rybka Aquarium (CTG format). For many of the standard openings. I've tried with at least main lines of
  a. QGD
  b. QGAcc
  c. Nimzo Qc2
  d. Caro Capablanca</p>
  <p>So far I couldn't find any differences between these 2 and have gone as deep as 17–20 moves in some lines. How do these two contrast?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-10-12T04:40:33.677Z
Comments.Text: https://chess.stackexchange.com/questions/6442/how-to-convert-chessbase-format-files-to-pgn
Comments.UserDisplayName: SmallChess
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-10-12T04:42:45.323Z
Comments.Text: Have you checked their statistics like ?http://help.chessbase.com/Reader/12/Eng/index.html?openings_book.htm
Comments.UserDisplayName: SmallChess
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-10-13T15:48:42.433Z
Comments.Text: What do you mean by "compare"? Do you want to know which one is deeper (i.e. which one includes more variations)?
Comments.UserDisplayName: Pablo S. Ocal
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-10-16T04:00:33.607Z
Comments.Text: @SmallChess, your link though useful does not explain your experience in using different books.
Comments.UserDisplayName: user2545476
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-10-16T04:02:10.973Z
Comments.Text: @Pablo, Yes precisely. There are some annotated games unique to each book is what I've found but for the main lines couldn't find variations that differ from different books.
Comments.UserDisplayName: user2545476
Tags: <opening><fritz>
Title: Chess Engine Opening book
ThreadText: # Chess Engine Opening book
  
  (Asked by: username_0 on 2017-10-12)
  
  I'm trying to evaluate the differences between Opening books.
  
  For example: Have Fritz 12 Book and Rybka Aquarium (CTG format). For many of the standard openings. I've tried with at least main lines of
  a. QGD
  b. QGAcc
  c. Nimzo Qc2
  d. Caro Capablanca
  
  So far I couldn't find any differences between these 2 and have gone as deep as 17–20 moves in some lines. How do these two contrast?
  
  **Tags:** opening, fritz
  
  > **Comments:**
  > **username_1**: https://chess.stackexchange.com/questions/6442/how-to-convert-chessbase-format-files-to-pgn  
  > **username_1**: Have you checked their statistics like ?http://help.chessbase.com/Reader/12/Eng/index.html?openings_book.htm  
  > **username_2**: What do you mean by "compare"? Do you want to know which one is deeper (i.e. which one includes more variations)?  
  > **username_0**: @username_1, your link though useful does not explain your experience in using different books.  
  > **username_0**: @username_2, Yes precisely. There are some annotated games unique to each book is what I've found but for the main lines couldn't find variations that differ from different books.  
  
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  ## 1 answers
  
  ### Answer by username_3 on 2018-06-28. Score: 3
  
  It's very unlikely you'll be able to compare opening books just by playing against them. Main lines will be approximately same in all books, what you really want to see is how "wide" these books are, do they contain only a few main lines, or plenty of variations as well.
  
  The easiest way to do that would be to convert the books back to the readable (PGN?) format and see how many different games are included for a particular opening.
  
  Might be easier to do that using some software than comparing by hand. Even better if the software can read the books directly, this way you don't lose any information while converting books to .PGN format, but you'll have to be able to program for that to happen, because I don't know any ready-to-use software for the books comparison.
  
  
  ---
  
  