Answers.Body: <p>A similar question was asked by GM Tony Kosten on the <a href="https://www.chesspub.com/cgi-bin/chess/YaBB.pl?num=1543899946/24" rel="nofollow noreferrer">chesspub forum</a> back in January:</p>
  
  <blockquote>
    <p>Looking at the last set of PGN files I received, at the beginning is a
    new tag followed by lots of numbers, like:   </p>
    
    <p>{[%evp
    0,96,30,30,22,1,30,2,2,-9,-3,-44,23,23,21,32,41,37,44,23,22,18,26,11,22,
    -4,0,-1,8,7,7,14,9,5,16,8,38,16,22,19,25,54,19,19,22,22,22,20,20,20,24,-18,24,
    -53,-53,-61,-61,-56,-23,-20,41,41,39,39,35,30,44,44,33,50,70,70,75,75,75,75,75,
    56,60,59,62,56,68,56,50,48,48,40,46,60,49,30,48,47,47,59,46,56,57]} </p>
    
    <p>I assume ChessBase 15 generates this when it quickly analyses games
    when you open them. However, is this a standard PGN code, can other
    chess programs read it?</p>
  </blockquote>
  
  <p>The original PGN standard was created and published in 1994 by Stephen J Edwards. Here is a copy of his original standard: <a href="http://www.saremba.de/chessgml/standards/pgn/pgn-complete.htm" rel="nofollow noreferrer">Portable Game Notation Specification and Implementation Guide</a>. By 2001 he had dropped out of the project when <a href="http://www.enpassant.dk/chess/palview/enhancedpgn.htm" rel="nofollow noreferrer">this supplement</a> was published to the PGN standard. There it defined a new embedded command string which would be marked by a starting "[%".</p>
  
  <blockquote>
    <p>3.2 A generalised format for embedding commands in comments.<br>
    3.2.1 Position<br>
    An embedded  command may occur at any position in a standard PGN comment, ie  between { } . For example: {Optional leading
    comments [%clk 1:05:23] optional trailing comments} where  [%clk
    1:05:23]  is the embedded command string.</p>
    
    <p>3.2.2 Structure The command string is structured as follows.</p>
    
    <p>A leading tag of [% A command name consisting of one or more
    alphanumeric characters. A space character. Either a single parameter
    or a comma delimited list of parameter values. A closing tag of ]</p>
  </blockquote>
  
  <p>So, "[%evp" is an embedded command, first seen in Chessbase 15 output. As such it is Chessbase 15-specific until such time as Chessbase publish how they use it, at which time other pgn producers/consumers can start using it too.</p>
  
  <p>My speculation, FWIW, is that it is part of Chessbase's "Chess Position Trainer" and is intended for Chessbase internal use only.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-11-21T11:05:01.150Z
Answers.LastActivityDate: 2019-11-21T11:05:01.150Z
Answers.UserDisplayName: Brian Towers
Body: <p>Example:</p>
  
  <pre><code>{[%evp 0,17,14,14,14,-25,-15,-15,7,7,55,48,48,48,472,228,802,802,804,771]} 
  1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 Bc5 5. d4 Bb6 6. Nf3 Qg4
  </code></pre>
  
  <p>What's the meaning of these numbers when used together with <code>%evp</code>?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-21T07:47:05.437Z
Comments.Text: Welcome to [chess.se]! I guess it's related to [`%eval`](https://chess.stackexchange.com/q/21786/7297). Any idea which program generated this PGN file?
Comments.UserDisplayName: Glorfindel
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-11-21T08:49:46.967Z
Comments.Text: the PGN is from Chessbase
Comments.UserDisplayName: ethanxyz_0
Tags: <pgn>
Title: What's the meaning of "%evp" in a PGN comment?
ThreadText: # What's the meaning of "%evp" in a PGN comment?
  
  (Asked by: username_0 on 2019-11-21)
  
  Example:
  
  ```
  {[%evp 0,17,14,14,14,-25,-15,-15,7,7,55,48,48,48,472,228,802,802,804,771]} 
  1. e4 e5 2. f4 exf4 3. Bc4 Qh4+ 4. Kf1 Bc5 5. d4 Bb6 6. Nf3 Qg4
  
  ```
  
  What's the meaning of these numbers when used together with `%evp`?
  
  **Tags:** pgn
  
  > **Comments:**
  > **username_1**: Welcome to [chess.se]! I guess it's related to [`%eval`](https://chess.stackexchange.com/q/21786/7297). Any idea which program generated this PGN file?  
  > **username_0**: the PGN is from Chessbase  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2019-11-21. Score: 3 | Accepted answer
  
  A similar question was asked by GM Tony Kosten on the [chesspub forum](https://www.chesspub.com/cgi-bin/chess/YaBB.pl?num=1543899946/24) back in January:
  
  > Looking at the last set of PGN files I received, at the beginning is a
  > new tag followed by lots of numbers, like:
  >
  > {[%evp
  > 0,96,30,30,22,1,30,2,2,-9,-3,-44,23,23,21,32,41,37,44,23,22,18,26,11,22,
  > -4,0,-1,8,7,7,14,9,5,16,8,38,16,22,19,25,54,19,19,22,22,22,20,20,20,24,-18,24,
  > -53,-53,-61,-61,-56,-23,-20,41,41,39,39,35,30,44,44,33,50,70,70,75,75,75,75,75,
  > 56,60,59,62,56,68,56,50,48,48,40,46,60,49,30,48,47,47,59,46,56,57]}
  >
  > I assume ChessBase 15 generates this when it quickly analyses games
  > when you open them. However, is this a standard PGN code, can other
  > chess programs read it?
  
  The original PGN standard was created and published in 1994 by Stephen J Edwards. Here is a copy of his original standard: [Portable Game Notation Specification and Implementation Guide](http://www.saremba.de/chessgml/standards/pgn/pgn-complete.htm). By 2001 he had dropped out of the project when [this supplement](http://www.enpassant.dk/chess/palview/enhancedpgn.htm) was published to the PGN standard. There it defined a new embedded command string which would be marked by a starting "[%".
  
  > 3.2 A generalised format for embedding commands in comments.  
  > 3.2.1 Position  
  > An embedded command may occur at any position in a standard PGN comment, ie between { } . For example: {Optional leading
  > comments [%clk 1:05:23] optional trailing comments} where [%clk
  > 1:05:23] is the embedded command string.
  >
  > 3.2.2 Structure The command string is structured as follows.
  >
  > A leading tag of [% A command name consisting of one or more
  > alphanumeric characters. A space character. Either a single parameter
  > or a comma delimited list of parameter values. A closing tag of ]
  
  So, "[%evp" is an embedded command, first seen in Chessbase 15 output. As such it is Chessbase 15-specific until such time as Chessbase publish how they use it, at which time other pgn producers/consumers can start using it too.
  
  My speculation, FWIW, is that it is part of Chessbase's "Chess Position Trainer" and is intended for Chessbase internal use only.
  
  
  ---
  
  