Substituting symbols in chess notation.

**wbport** · 05-05-2012 10:58 PM

In English speaking countries, chess notation (.pgn) looks something like this:

Code:

1. d4 Nf6 2. Nf3 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Be2 b6 7. Ne5 Bb7
8. h4 Nbd7 9. f3 Nxe5 10. Bxe5 Ne8 11. Bxg7 Nxg7 12. f4 e5 13. fxe5 f6
14. Bf3 fxe5 15. dxe5 c6 16. Qd2 Qe8 17. O-O-O Rd8 18. h5 gxh5 19. Qd4 c5
20. Qh4 Qxe5

The letters for the pieces (KQBNR) are converted to symbols as found in a diagram for international audiences using high ascii in specialized fonts.

The regular expression for a typical move should look something like this: /([BKNRQ])([a-h1-8]?x?[a-h][1-8])/ and a pawn promotion /([a-h]?x?[a-h][18]=)([BNRQ])/ . A brute strength method of looking at all upper case letters wouldn't work when there are comments such as "Note the Queen is hanging." and symbols shouldn't be substituted for the N and Q outside of a move.

I am at a loss as to how to do this when there are many moves on a line.

TIA

**JMRKER** · 05-06-2012 09:34 PM

Can you give a brief description of the 'chess notation (.pgn)'?

What are the 'high ascii in specialized fonts' values for the (KQBNR) pieces?

You described the input but can you describe the output a bit more?
What should we convert to when detecting the typical moves?

**wbport** · 05-07-2012 09:25 AM

I had installed this font Chess Cases to do diagrams ChessDiag.htm and wanted to extend what it could do. In this font the symbols
for "KQBNR" are "¢£¤¥¦" respectively.
I would want to change

Code:

1. d4 Nf6 2. Nf3 g6 3. Nc3 d5 4. Bf4 Bg7

to

Code:

1. d4 ¤f6 2. ¤f3 g6 3. ¤c3 d5 4. ¥f4 ¥g7

When copied to a word processor with that font in control, the N and B would be replaced by the symbol for those pieces as it would appear in a diagram.

This is a description of PGN from wikipedia: Portable_Game_Notation

Thanks for looking at it.

**JMRKER** · 05-08-2012 10:04 AM

The following is just a start. It does not filter out the { xxx } or ';' comments called for in your PGN chess link.
But it does the majority of the work for you.

Code:

<!DOC HTML>
<html>
<head>
<title> PGN Conversion </title>
<script type="text/javascript">
//<![CDATA[
// "KQBNR" are "¢£¤¥¦"

String.prototype.PGNamer = function() {
  var PGNsymbols = ['¢','£','¤','¥','¦'];
  var tstr = '';  var ptr = '';
  var tarr = this.split('');
  for (var i=0; i<tarr.length; i++) {
    ptr = 'KQBNR'.indexOf(tarr[i]);  
    if (ptr == -1) { tstr += tarr[i]; }
              else { tstr += PGNsymbols[ptr]; }
  }
  return tstr+' ';
} 
function PGNconverter() {
  var str = '';
  var tarr = document.getElementById('fromText').value.split(' ');
  for (var i=0; i<tarr.length; i++) {
    str += tarr[i].PGNamer();
  }
  document.getElementById('toPGN').value = str;
}
//]]>
</script>

</head>
<body>
From text:<br>
<textarea rows="8" cols="80" id="fromText">
1. d4 Nf6 2. Nf3 g6 3. Nc3 d5 4. Bf4 Bg7 5. e3 O-O 6. Be2 b6 7. Ne5 Bb7
8. h4 Nbd7 9. f3 Nxe5 10. Bxe5 Ne8 11. Bxg7 Nxg7 12. f4 e5 13. fxe5 f6
14. Bf3 fxe5 15. dxe5 c6 16. Qd2 Qe8 17. O-O-O Rd8 18. h5 gxh5 19. Qd4 c5
20. Qh4 Qxe5
</textarea><p>
<button onclick="PGNconverter()">Converted to PGN</button>:<br>
<textarea rows="8" cols="80" id="toPGN">
</textarea><p>
</body>
</html>

Good Luck!

**wbport** · 05-09-2012 06:36 AM

Thanks, I'll be checking it out in a few days.

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