user20615: 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?

user4418: A similar question was asked by GM Tony Kosten on the chesspub forum 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. By 2001 he had dropped out of the project when this supplement 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.

20615: <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>
 4418: <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>
