A jQuery-based javascript library for parsing and displaying chess games.
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README.md

jChess

A jQuery based javascript library for parsing and displaying chess games. Currently takes FEN and PGN as inputs.

Instructions

Given an empty div tag like so:

<div id="chess-board"></div>

You can...

1) Create a new chess board:

jQuery('#chess-board').chess();

2) Display a chess position using FEN:

jQuery('#chess-board').chess({fen : "rnbqkbnr/pp1ppppp/8/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R b KQkq - 1 2"});

And if you have a PGN game (the real point of this library):

<p id="pgn-fischer-spassky">      
  [Event "F/S Return Match"]
  [Site "Belgrade, Serbia JUG"]
  [Date "1992.11.04"]
  [Round "29"]
  [White "Fischer, Robert J."]
  [Black "Spassky, Boris V."]
  [Result "1/2-1/2"]

  1.e4 e5 2.Nf3 Nc6 3.Bb5 {This opening is called the Ruy Lopez.} 3...a6
  4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8  10.d4 Nbd7
  11.c4 c6 12.cxb5 axb5 13.Nc3 Bb7 14.Bg5 b4 15.Nb1 h6 16.Bh4 c5 17.dxe5
  Nxe4 18.Bxe7 Qxe7 19.exd6 Qf6 20.Nbd2 Nxd6 21.Nc4 Nxc4 22.Bxc4 Nb6
  23.Ne5 Rae8 24.Bxf7+ Rxf7 25.Nxf7 Rxe1+ 26.Qxe1 Kxf7 27.Qe3 Qg5 28.Qxg5
  hxg5 29.b3 Ke6 30.a3 Kd6 31.axb4 cxb4 32.Ra5 Nd5 33.f3 Bc8 34.Kf2 Bf5
  35.Ra7 g6 36.Ra6+ Kc5 37.Ke1 Nf4 38.g3 Nxh3 39.Kd2 Kb5 40.Rd6 Kc5 41.Ra6
  Nf2 42.g4 Bd3 43.Re6 1/2-1/2
</p>

You can...

3) Load a chess game via PGN and play through it:

var chess = jQuery('#chess-board').chess({pgn : jQuery('#pgn-fischer-spassky').html()});

chess.transitionForward();  // Moves the game forward one move
chess.transitionBackward(); // Moves the game backward one move
chess.transitionTo(n);      // Jumps to the specified halfmove
chess.flipBoard();          // You guessed it, flips the board

See index.html for some real examples.