text: /*!
   * chessboard.js v0.3.0
   *
   * Copyright 2013 Chris Oakman
   * Released under the MIT license
   * http://chessboardjs.com/license
   *
   * Date: 10 Aug 2013
   */
  
  // start anonymous scope
  ;(function() {
  'use strict';
  
  //------------------------------------------------------------------------------
  // Chess Util Functions
  //------------------------------------------------------------------------------
  var COLUMNS = 'abcdefgh'.split('');
  var BLACK_SPARES = ['wK', 'wQ', 'wR', 'wB', 'wN'];  
  var WHITE_SPARES = ['bK', 'bQ', 'bR', 'bB', 'bN'];
  
  
  function validMove(move) {
    // move should be a string
    if (typeof move !== 'string') return false;
  
    // move should be in the form of "e2-e4", "f6-d5"
    var tmp = move.split('-');
    if (tmp.length !== 2) return false;
  
    return (validSquare(tmp[0]) === true && validSquare(tmp[1]) === true);
  }
  
  function validSquare(square) {
    if (typeof square !== 'string') return false;
    return (square.search(/^[a-h][1-8]$/) !== -1);
  }
  
  function validPieceCode(code) {
    if (typeof code !== 'string') return false;
    return (code.search(/^[bw][KQRNBP]$/) !== -1);
  }
  
  // TODO: this whole function could probably be replaced with a single regex
  function validFen(fen) {
    if (typeof fen !== 'string') return false;
  
    // cut off any move, castling, etc info from the end
    // we're only interested in position information
    fen = fen.replace(/ .+$/, '');
  
    // FEN should be 8 sections separated by slashes
    var chunks = fen.split('/');
    if (chunks.length !== 8) return false;
  
    // check the piece sections
    for (var i = 0; i < 8; i++) {
      if (chunks[i] === '' ||
          chunks[i].length > 8 ||
          chunks[i].search(/[^kqrbnpKQRNBP1-8]/) !== -1) {
        return false;
      }
    }
  
    return true;
  }
  
  function validPositionObject(pos) {
    if (typeof pos !== 'object') return false;
  
    for (var i in pos) {
      if (pos.hasOwnProperty(i) !== true) continue;
  
      if (validSquare(i) !== true || validPieceCode(pos[i]) !== true) {
        return false;
      }
    }
  
    return true;
  }
  
  // convert FEN piece code to bP, wK, etc
  function fenToPieceCode(piece) {
    // black piece
    if (piece.toLowerCase() === piece) {
      return 'b' + piece.toUpperCase();
    }
  
    // white piece
    return 'w' + piece.toUpperCase();
  }
  
  // convert bP, wK, etc code to FEN structure
  function pieceCodeToFen(piece) {
    var tmp = piece.split('');
  
    // white piece
    if (tmp[0] === 'w') {
      return tmp[1].toUpperCase();
    }
  
    // black piece
    return tmp[1].toLowerCase();
  }
  
  // convert FEN string to position object
  // returns false if the FEN string is invalid
  function fenToObj(fen) {
    if (validFen(fen) !== true) {
      return false;
    }
  
    // cut off any move, castling, etc info from the end
    // we're only interested in position information
    fen = fen.replace(/ .+$/, '');
  
    var rows = fen.split('/');
    var position = {};
  
    var currentRow = 8;
    for (var i = 0; i < 8; i++) {
      var row = rows[i].split('');
      var colIndex = 0;
  
      // loop through each character in the FEN section
      for (var j = 0; j < row.length; j++) {
        // number / empty squares
        if (row[j].search(/[1-8]/) !== -1) {
          var emptySquares = parseInt(row[j], 10);
          colIndex += emptySquares;
        }
        // piece
        else {
          var square = COLUMNS[colIndex] + currentRow;
          position[square] = fenToPieceCode(row[j]);
          colIndex++;
        }
      }
  
      currentRow--;
    }
  
    return position;
  }
  
  // position object to FEN string
  // returns false if the obj is not a valid position object
  function objToFen(obj) {
    if (validPositionObject(obj) !== true) {
      return false;
    }
  
    var fen = '';
  
    var currentRow = 8;
    for (var i = 0; i < 8; i++) {
      for (var j = 0; j < 8; j++) {
        var square = COLUMNS[j] + currentRow;
  
        // piece exists
        if (obj.hasOwnProperty(square) === true) {
          fen += pieceCodeToFen(obj[square]);
        }
  
        // empty space
        else {
          fen += '1';
        }
      }
  
      if (i !== 7) {
        fen += '/';
      }
  
      currentRow--;
    }
  
    // squeeze the numbers together
    // haha, I love this solution...
    fen = fen.replace(/11111111/g, '8');
    fen = fen.replace(/1111111/g, '7');
    fen = fen.replace(/111111/g, '6');
    fen = fen.replace(/11111/g, '5');
    fen = fen.replace(/1111/g, '4');
    fen = fen.replace(/111/g, '3');
    fen = fen.replace(/11/g, '2');
  
    return fen;
  }
  
  window['ChessBoard'] = window['ChessBoard'] || function(containerElOrId, cfg) {
  'use strict';
  
  cfg = cfg || {};
  
  //------------------------------------------------------------------------------
  // Constants
  //------------------------------------------------------------------------------
  
  var MINIMUM_JQUERY_VERSION = '1.7.0',
    START_FEN = 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR',
    START_POSITION = fenToObj(START_FEN);
  
  // use unique class names to prevent clashing with anything else on the page
  // and simplify selectors
  var CSS = {
    alpha: 'alpha-d2270',
    black: 'black-3c85d',
    board: 'board-b72b1',
    chessboard: 'chessboard-63f37',
    clearfix: 'clearfix-7da63',
    highlight1: 'highlight1-32417',
    highlight2: 'highlight2-9c5d2',
    notation: 'notation-322f9',
    numeric: 'numeric-fc462',
    piece: 'piece-417db',
    row: 'row-5277c',
    sparePieces: 'spare-pieces-7492f',
    sparePiecesBottom: 'spare-pieces-bottom-ae20f',
    sparePiecesTop: 'spare-pieces-top-4028b',
    square: 'square-55d63',
    white: 'white-1e1d7'
  };
  
  //------------------------------------------------------------------------------
  // Module Scope Variables
  //------------------------------------------------------------------------------
  
  // DOM elements
  var containerEl,
    boardEl,
    draggedPieceEl,
    sparePiecesTopEl,
    sparePiecesBottomEl;
  
  // constructor return object
  var widget = {};
  
  //------------------------------------------------------------------------------
  // Stateful
  //------------------------------------------------------------------------------
  
  var ANIMATION_HAPPENING = false,
    BOARD_BORDER_SIZE = 2,
    CURRENT_ORIENTATION = 'white',
    CURRENT_POSITION = {},
    SQUARE_SIZE,
    DRAGGED_PIECE,
    DRAGGED_PIECE_LOCATION,
    DRAGGED_PIECE_SOURCE,
    DRAGGING_A_PIECE = false,
    SPARE_PIECE_ELS_IDS = {},
    SQUARE_ELS_IDS = {},
    SQUARE_ELS_OFFSETS;
  
  //------------------------------------------------------------------------------
  // JS Util Functions
  //------------------------------------------------------------------------------
  
  // http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript
  function createId() {
    return 'xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx'.replace(/x/g, function(c) {
      var r = Math.random() * 16 | 0;
      return r.toString(16);
    });
  }
  
  function deepCopy(thing) {
    return JSON.parse(JSON.stringify(thing));
  }
  
  function parseSemVer(version) {
    var tmp = version.split('.');
    return {
      major: parseInt(tmp[0], 10),
      minor: parseInt(tmp[1], 10),
      patch: parseInt(tmp[2], 10)
    };
  }
  
  // returns true if version is >= minimum
  function compareSemVer(version, minimum) {
    version = parseSemVer(version);
    minimum = parseSemVer(minimum);
  
    var versionNum = (version.major * 10000 * 10000) +
      (version.minor * 10000) + version.patch;
    var minimumNum = (minimum.major * 10000 * 10000) +
      (minimum.minor * 10000) + minimum.patch;
  
    return (versionNum >= minimumNum);
  }
  
  //------------------------------------------------------------------------------
  // Validation / Errors
  //------------------------------------------------------------------------------
  
  function error(code, msg, obj) {
    // do nothing if showErrors is not set
    if (cfg.hasOwnProperty('showErrors') !== true ||
        cfg.showErrors === false) {
      return;
    }
  
    var errorText = 'ChessBoard Error ' + code + ': ' + msg;
  
    // print to console
    if (cfg.showErrors === 'console' &&
        typeof console === 'object' &&
        typeof console.log === 'function') {
      console.log(errorText);
      if (arguments.length >= 2) {
        console.log(obj);
      }
      return;
    }
  
    // alert errors
    if (cfg.showErrors === 'alert') {
      if (obj) {
        errorText += '\n\n' + JSON.stringify(obj);
      }
      window.alert(errorText);
      return;
    }
  
    // custom function
    if (typeof cfg.showErrors === 'function') {
      cfg.showErrors(code, msg, obj);
    }
  }
  
  // check dependencies
  function checkDeps() {
    // if containerId is a string, it must be the ID of a DOM node
    if (typeof containerElOrId === 'string') {
      // cannot be empty
      if (containerElOrId === '') {
        window.alert('ChessBoard Error 1001: ' +
          'The first argument to ChessBoard() cannot be an empty string.' +
          '\n\nExiting...');
        return false;
      }
  
      // make sure the container element exists in the DOM
      var el = document.getElementById(containerElOrId);
      if (! el) {
        window.alert('ChessBoard Error 1002: Element with id "' +
          containerElOrId + '" does not exist in the DOM.' +
          '\n\nExiting...');
        return false;
      }
  
      // set the containerEl
      containerEl = $(el);
    }
  
    // else it must be something that becomes a jQuery collection
    // with size 1
    // ie: a single DOM node or jQuery object
    else {
      containerEl = $(containerElOrId);
  
      if (containerEl.length !== 1) {
        window.alert('ChessBoard Error 1003: The first argument to ' +
          'ChessBoard() must be an ID or a single DOM node.' +
          '\n\nExiting...');
        return false;
      }
    }
  
    // JSON must exist
    if (! window.JSON ||
        typeof JSON.stringify !== 'function' ||
        typeof JSON.parse !== 'function') {
      window.alert('ChessBoard Error 1004: JSON does not exist. ' +
        'Please include a JSON polyfill.\n\nExiting...');
      return false;
    }
  
    // check for a compatible version of jQuery
    if (! (typeof window.$ && $.fn && $.fn.jquery &&
        compareSemVer($.fn.jquery, MINIMUM_JQUERY_VERSION) === true)) {
      window.alert('ChessBoard Error 1005: Unable to find a valid version ' +
        'of jQuery. Please include jQuery ' + MINIMUM_JQUERY_VERSION + ' or ' +
        'higher on the page.\n\nExiting...');
      return false;
    }
  
    return true;
  }
  
  function validAnimationSpeed(speed) {
    if (speed === 'fast' || speed === 'slow') {
      return true;
    }
  
    if ((parseInt(speed, 10) + '') !== (speed + '')) {
      return false;
    }
  
    return (speed >= 0);
  }
  
  // validate config / set default options
  function expandConfig() {
    if (typeof cfg === 'string' || validPositionObject(cfg) === true) {
      cfg = {
        position: cfg
      };
    }
  
    // default for orientation is white
    if (cfg.orientation !== 'black') {
      cfg.orientation = 'white';
    }
    CURRENT_ORIENTATION = cfg.orientation;
  
    // default for showNotation is true
    if (cfg.showNotation !== false) {
      cfg.showNotation = true;
    }
  
    // default for draggable is false
    if (cfg.draggable !== true) {
      cfg.draggable = false;
    }
  
    // default for dropOffBoard is 'snapback'
    if (cfg.dropOffBoard !== 'trash') {
      cfg.dropOffBoard = 'snapback';
    }
  
    // default for sparePieces is false
    if (cfg.sparePieces !== true) {
      cfg.sparePieces = false;
    }
  
    // draggable must be true if sparePieces is enabled
    if (cfg.sparePieces === true) {
      cfg.draggable = true;
    }
  
    // default piece theme is wikipedia
    if (cfg.hasOwnProperty('pieceTheme') !== true ||
        (typeof cfg.pieceTheme !== 'string' &&
         typeof cfg.pieceTheme !== 'function')) {
      cfg.pieceTheme = 'img/chesspieces/wikipedia/{piece}.png';
    }
  
    // animation speeds
    if (cfg.hasOwnProperty('appearSpeed') !== true ||
        validAnimationSpeed(cfg.appearSpeed) !== true) {
      cfg.appearSpeed = 200;
    }
    if (cfg.hasOwnProperty('moveSpeed') !== true ||
        validAnimationSpeed(cfg.moveSpeed) !== true) {
      cfg.moveSpeed = 200;
    }
    if (cfg.hasOwnProperty('snapbackSpeed') !== true ||
        validAnimationSpeed(cfg.snapbackSpeed) !== true) {
      cfg.snapbackSpeed = 50;
    }
    if (cfg.hasOwnProperty('snapSpeed') !== true ||
        validAnimationSpeed(cfg.snapSpeed) !== true) {
      cfg.snapSpeed = 25;
    }
    if (cfg.hasOwnProperty('trashSpeed') !== true ||
        validAnimationSpeed(cfg.trashSpeed) !== true) {
      cfg.trashSpeed = 100;
    }
  
    // make sure position is valid
    if (cfg.hasOwnProperty('position') === true) {
      if (cfg.position === 'start') {
        CURRENT_POSITION = deepCopy(START_POSITION);
      }
  
      else if (validFen(cfg.position) === true) {
        CURRENT_POSITION = fenToObj(cfg.position);
      }
  
      else if (validPositionObject(cfg.position) === true) {
        CURRENT_POSITION = deepCopy(cfg.position);
      }
  
      else {
        error(7263, 'Invalid value passed to config.position.', cfg.position);
      }
    }
  
    return true;
  }
  
  //------------------------------------------------------------------------------
  // DOM Misc
  //------------------------------------------------------------------------------
  
  // calculates square size based on the width of the container
  // got a little CSS black magic here, so let me explain:
  // get the width of the container element (could be anything), reduce by 1 for
  // fudge factor, and then keep reducing until we find an exact mod 8 for
  // our square size
  function calculateSquareSize() {
    var containerWidth = parseInt(containerEl.css('width'), 10);
  
    // defensive, prevent infinite loop
    if (! containerWidth || containerWidth <= 0) {
      return 0;
    }
  
    // pad one pixel
    var boardWidth = containerWidth - 1;
  
    while (boardWidth % cfg.boardSize !== 0 && boardWidth > 0) {
      boardWidth--;
    }
  
    return (boardWidth / cfg.boardSize);
  }
  
  // create random IDs for elements
  function createElIds() {
    // squares on the board
    for (var i = 0; i < cfg.columns.length; i++) {
      for (var j = 1; j <= cfg.boardSize; j++) {
        var square = COLUMNS[i] + j;
        SQUARE_ELS_IDS[square] = square + '-' + createId();
      }
    }
  
    // spare pieces
    var pieces = 'KQRBNP'.split('');
    for (var i = 0; i < pieces.length; i++) {
      var whitePiece = 'w' + pieces[i];
      var blackPiece = 'b' + pieces[i];
      SPARE_PIECE_ELS_IDS[whitePiece] = whitePiece + '-' + createId();
      SPARE_PIECE_ELS_IDS[blackPiece] = blackPiece + '-' + createId();
    }
  }
  
  //------------------------------------------------------------------------------
  // Markup Building
  //------------------------------------------------------------------------------
  
  function buildBoardContainer() {
    var html = '<div class="' + CSS.chessboard + '">';
  
    if (cfg.sparePieces === true) {
      html += '<div class="' + CSS.sparePieces + ' ' +
        CSS.sparePiecesTop + '"></div>';
    }
  
    html += '<div class="' + CSS.board + '"></div>';
  
    if (cfg.sparePieces === true) {
      html += '<div class="' + CSS.sparePieces + ' ' +
        CSS.sparePiecesBottom + '"></div>';
    }
  
    html += '</div>';
  
    return html;
  }
  
  /*
  var buildSquare = function(color, size, id) {
    var html = '<div class="' + CSS.square + ' ' + CSS[color] + '" ' +
    'style="width: ' + size + 'px; height: ' + size + 'px" ' +
    'id="' + id + '">';
  
    if (cfg.showNotation === true) {
  
    }
  
    html += '</div>';
  
    return html;
  };
  */
  
  function buildBoard(orientation) {
    if (orientation !== 'black') {
      orientation = 'white';
    }
  
    var html = '';
  
    // algebraic notation / orientation
    var alpha = deepCopy(COLUMNS);
    var row = cfg.boardSize;
    if (orientation === 'black') {
      alpha.reverse();
      row = 1;
    }
  
    var squareColor = 'white';
    for (var i = 0; i < cfg.boardSize; i++) {
      html += '<div class="' + CSS.row + '">';
      squareColor = (i%2 ? 'black': 'white');  
      for (var j = 0; j < cfg.boardSize; j++) {
        var square = alpha[j] + row;
  
        html += '<div class="' + CSS.square + ' ' + CSS[squareColor] + ' ' +
          'square-' + square + '" ' +
          'style="width: ' + SQUARE_SIZE + 'px; height: ' + SQUARE_SIZE + 'px" ' +
          'id="' + SQUARE_ELS_IDS[square] + '" ' +
          'data-square="' + square + '">';
  
        if (cfg.showNotation === true) {
          // alpha notation
          if ((orientation === 'white' && row === 1) ||
              (orientation === 'black' && row === cfg.boardSize)) {
            html += '<div class="' + CSS.notation + ' ' + CSS.alpha + '">' +
              alpha[j] + '</div>';
          }
  
          // numeric notation
          if (j === 0) {
            html += '<div class="' + CSS.notation + ' ' + CSS.numeric + '">' +
              row + '</div>';
          }
        }
  
        html += '</div>'; // end .square
  
        squareColor = (squareColor === 'white' ? 'black' : 'white');
      }
      html += '<div class="' + CSS.clearfix + '"></div></div>';
  
      squareColor = (squareColor === 'white' ? 'black' : 'white');
  
      if (orientation === 'white') {
        row--;
      }
      else {
        row++;
      }
    }
  
    return html;
  }
  
  function buildPieceImgSrc(piece) {
    if (typeof cfg.pieceTheme === 'function') {
      return cfg.pieceTheme(piece);
    }
  
    if (typeof cfg.pieceTheme === 'string') {
      return cfg.pieceTheme.replace(/{piece}/g, piece);
    }
  
    // NOTE: this should never happen
    error(8272, 'Unable to build image source for cfg.pieceTheme.');
    return '';
  }
  
  function buildPiece(piece, hidden, id) {
    var html = '<img src="' + buildPieceImgSrc(piece) + '" ';
    if (id && typeof id === 'string') {
      html += 'id="' + id + '" ';
    }
    html += 'alt="" ' +
    'class="' + CSS.piece + '" ' +
    'data-piece="' + piece + '" ' +
    'style="width: ' + SQUARE_SIZE + 'px;' +
    'height: ' + SQUARE_SIZE + 'px;';
    if (hidden === true) {
      html += 'display:none;';
    }
    html += '" />';
  
    return html;
  }
  
  function buildSparePieces(color) {
    var pieces = WHITE_SPARES;
    if (color === 'black') {
      pieces = BLACK_SPARES;
    }
  
    var html = '';
    for (var i = 0; i < pieces.length; i++) {
      html += buildPiece(pieces[i], false, SPARE_PIECE_ELS_IDS[pieces[i]]);
    }
  
    return html;
  }
  
  //------------------------------------------------------------------------------
  // Animations
  //------------------------------------------------------------------------------
  
  function animateSquareToSquare(src, dest, piece, completeFn) {
    // get information about the source and destination squares
    var srcSquareEl = $('#' + SQUARE_ELS_IDS[src]);
    var srcSquarePosition = srcSquareEl.offset();
    var destSquareEl = $('#' + SQUARE_ELS_IDS[dest]);
    var destSquarePosition = destSquareEl.offset();
  
    // create the animated piece and absolutely position it
    // over the source square
    var animatedPieceId = createId();
    $('body').append(buildPiece(piece, true, animatedPieceId));
    var animatedPieceEl = $('#' + animatedPieceId);
    animatedPieceEl.css({
      display: '',
      position: 'absolute',
      top: srcSquarePosition.top,
      left: srcSquarePosition.left
    });
  
    // remove original piece from source square
    srcSquareEl.find('.' + CSS.piece).remove();
  
    // on complete
    var complete = function() {
      // add the "real" piece to the destination square
      destSquareEl.append(buildPiece(piece));
  
      // remove the animated piece
      animatedPieceEl.remove();
  
      // run complete function
      if (typeof completeFn === 'function') {
        completeFn();
      }
    };
  
    // animate the piece to the destination square
    var opts = {
      duration: cfg.moveSpeed,
      complete: complete
    };
    animatedPieceEl.animate(destSquarePosition, opts);
  }
  
  function animateSparePieceToSquare(piece, dest, completeFn) {
    var srcOffset = $('#' + SPARE_PIECE_ELS_IDS[piece]).offset();
    var destSquareEl = $('#' + SQUARE_ELS_IDS[dest]);
    var destOffset = destSquareEl.offset();
  
    // create the animate piece
    var pieceId = createId();
    $('body').append(buildPiece(piece, true, pieceId));
    var animatedPieceEl = $('#' + pieceId);
    animatedPieceEl.css({
      display: '',
      position: 'absolute',
      left: srcOffset.left,
      top: srcOffset.top
    });
  
    // on complete
    var complete = function() {
      // add the "real" piece to the destination square
      destSquareEl.find('.' + CSS.piece).remove();
      destSquareEl.append(buildPiece(piece));
  
      // remove the animated piece
      animatedPieceEl.remove();
  
      // run complete function
      if (typeof completeFn === 'function') {
        completeFn();
      }
    };
  
    // animate the piece to the destination square
    var opts = {
      duration: cfg.moveSpeed,
      complete: complete
    };
    animatedPieceEl.animate(destOffset, opts);
  }
  
  // execute an array of animations
  function doAnimations(a, oldPos, newPos) {
    ANIMATION_HAPPENING = true;
  
    var numFinished = 0;
    function onFinish() {
      numFinished++;
  
      // exit if all the animations aren't finished
      if (numFinished !== a.length) return;
  
      drawPositionInstant();
      ANIMATION_HAPPENING = false;
  
      // run their onMoveEnd function
      if (cfg.hasOwnProperty('onMoveEnd') === true &&
        typeof cfg.onMoveEnd === 'function') {
        cfg.onMoveEnd(deepCopy(oldPos), deepCopy(newPos));
      }
    }
  
    for (var i = 0; i < a.length; i++) {
      // clear a piece
      if (a[i].type === 'clear') {
        $('#' + SQUARE_ELS_IDS[a[i].square] + ' .' + CSS.piece)
          .fadeOut(cfg.trashSpeed, onFinish);
      }
  
      // add a piece (no spare pieces)
      if (a[i].type === 'add' && cfg.sparePieces !== true) {
        $('#' + SQUARE_ELS_IDS[a[i].square])
          .append(buildPiece(a[i].piece, true))
          .find('.' + CSS.piece)
          .fadeIn(cfg.appearSpeed, onFinish);
      }
  
      // add a piece from a spare piece
      if (a[i].type === 'add' && cfg.sparePieces === true) {
        animateSparePieceToSquare(a[i].piece, a[i].square, onFinish);
      }
  
      // move a piece
      if (a[i].type === 'move') {
        animateSquareToSquare(a[i].source, a[i].destination, a[i].piece,
          onFinish);
      }
    }
  }
  
  // returns the distance between two squares
  function squareDistance(s1, s2) {
    s1 = s1.split('');
    var s1x = COLUMNS.indexOf(s1[0]) + 1;
    var s1y = parseInt(s1[1], 10);
  
    s2 = s2.split('');
    var s2x = COLUMNS.indexOf(s2[0]) + 1;
    var s2y = parseInt(s2[1], 10);
  
    var xDelta = Math.abs(s1x - s2x);
    var yDelta = Math.abs(s1y - s2y);
  
    if (xDelta >= yDelta) return xDelta;
    return yDelta;
  }
  
  // returns an array of closest squares from square
  function createRadius(square) {
    var squares = [];
  
    // calculate distance of all squares
    for (var i = 0; i < 8; i++) {
      for (var j = 0; j < 8; j++) {
        var s = COLUMNS[i] + (j + 1);
  
        // skip the square we're starting from
        if (square === s) continue;
  
        squares.push({
          square: s,
          distance: squareDistance(square, s)
        });
      }
    }
  
    // sort by distance
    squares.sort(function(a, b) {
      return a.distance - b.distance;
    });
  
    // just return the square code
    var squares2 = [];
    for (var i = 0; i < squares.length; i++) {
      squares2.push(squares[i].square);
    }
  
    return squares2;
  }
  
  // returns the square of the closest instance of piece
  // returns false if no instance of piece is found in position
  function findClosestPiece(position, piece, square) {
    // create array of closest squares from square
    var closestSquares = createRadius(square);
  
    // search through the position in order of distance for the piece
    for (var i = 0; i < closestSquares.length; i++) {
      var s = closestSquares[i];
  
      if (position.hasOwnProperty(s) === true && position[s] === piece) {
        return s;
      }
    }
  
    return false;
  }
  
  // calculate an array of animations that need to happen in order to get
  // from pos1 to pos2
  function calculateAnimations(pos1, pos2) {
    // make copies of both
    pos1 = deepCopy(pos1);
    pos2 = deepCopy(pos2);
  
    var animations = [];
    var squaresMovedTo = {};
  
    // remove pieces that are the same in both positions
    for (var i in pos2) {
      if (pos2.hasOwnProperty(i) !== true) continue;
  
      if (pos1.hasOwnProperty(i) === true && pos1[i] === pos2[i]) {
        delete pos1[i];
        delete pos2[i];
      }
    }
  
    // find all the "move" animations
    for (var i in pos2) {
      if (pos2.hasOwnProperty(i) !== true) continue;
  
      var closestPiece = findClosestPiece(pos1, pos2[i], i);
      if (closestPiece !== false) {
        animations.push({
          type: 'move',
          source: closestPiece,
          destination: i,
          piece: pos2[i]
        });
  
        delete pos1[closestPiece];
        delete pos2[i];
        squaresMovedTo[i] = true;
      }
    }
  
    // add pieces to pos2
    for (var i in pos2) {
      if (pos2.hasOwnProperty(i) !== true) continue;
  
      animations.push({
        type: 'add',
        square: i,
        piece: pos2[i]
      })
  
      delete pos2[i];
    }
  
    // clear pieces from pos1
    for (var i in pos1) {
      if (pos1.hasOwnProperty(i) !== true) continue;
  
      // do not clear a piece if it is on a square that is the result
      // of a "move", ie: a piece capture
      if (squaresMovedTo.hasOwnProperty(i) === true) continue;
  
      animations.push({
        type: 'clear',
        square: i,
        piece: pos1[i]
      });
  
      delete pos1[i];
    }
  
    return animations;
  }
  
  //------------------------------------------------------------------------------
  // Control Flow
  //------------------------------------------------------------------------------
  
  function drawPositionInstant() {
    // clear the board
    boardEl.find('.' + CSS.piece).remove();
  
    // add the pieces
    for (var i in CURRENT_POSITION) {
      if (CURRENT_POSITION.hasOwnProperty(i) !== true) continue;
  
      $('#' + SQUARE_ELS_IDS[i]).append(buildPiece(CURRENT_POSITION[i]));
    }
  }
  
  function drawBoard() {
    boardEl.html(buildBoard(CURRENT_ORIENTATION));
    drawPositionInstant();
  
    if (cfg.sparePieces === true) {
      if (CURRENT_ORIENTATION === 'white') {
        sparePiecesTopEl.html(buildSparePieces('black'));
        sparePiecesBottomEl.html(buildSparePieces('white'));
      }
      else {
        sparePiecesTopEl.html(buildSparePieces('white'));
        sparePiecesBottomEl.html(buildSparePieces('black'));
      }
    }
  }
  
  // given a position and a set of moves, return a new position
  // with the moves executed
  function calculatePositionFromMoves(position, moves) {
    position = deepCopy(position);
  
    for (var i in moves) {
      if (moves.hasOwnProperty(i) !== true) continue;
  
      // skip the move if the position doesn't have a piece on the source square
      if (position.hasOwnProperty(i) !== true) continue;
  
      var piece = position[i];
      delete position[i];
      position[moves[i]] = piece;
    }
  
    return position;
  }
  
  function setCurrentPosition(position) {
    var oldPos = deepCopy(CURRENT_POSITION);
    var newPos = deepCopy(position);
    var oldFen = objToFen(oldPos);
    var newFen = objToFen(newPos);
  
    // do nothing if no change in position
    if (oldFen === newFen) return;
  
    // run their onChange function
    if (cfg.hasOwnProperty('onChange') === true &&
      typeof cfg.onChange === 'function') {
      cfg.onChange(oldPos, newPos);
    }
  
    // update state
    CURRENT_POSITION = position;
  }
  
  function isXYOnSquare(x, y) {
    for (var i in SQUARE_ELS_OFFSETS) {
      if (SQUARE_ELS_OFFSETS.hasOwnProperty(i) !== true) continue;
  
      var s = SQUARE_ELS_OFFSETS[i];
      if (x >= s.left && x < s.left + SQUARE_SIZE &&
          y >= s.top && y < s.top + SQUARE_SIZE) {
        return i;
      }
    }
  
    return 'offboard';
  }
  
  // records the XY coords of every square into memory
  function captureSquareOffsets() {
    SQUARE_ELS_OFFSETS = {};
  
    for (var i in SQUARE_ELS_IDS) {
      if (SQUARE_ELS_IDS.hasOwnProperty(i) !== true) continue;
  
      SQUARE_ELS_OFFSETS[i] = $('#' + SQUARE_ELS_IDS[i]).offset();
    }
  }
  
  function removeSquareHighlights() {
    boardEl.find('.' + CSS.square)
      .removeClass(CSS.highlight1 + ' ' + CSS.highlight2);
  }
  
  function snapbackDraggedPiece() {
    // there is no "snapback" for spare pieces
    console.log('snapback dragged piece');
    if (DRAGGED_PIECE_SOURCE === 'spare') {
      //trashDraggedPiece();
      //return;
    }
  
    removeSquareHighlights();
  
    // animation complete
    function complete() {
      drawPositionInstant();
      draggedPieceEl.css('display', 'none');
      if (DRAGGED_PIECE_SOURCE == 'spare'){
        console.log('snapback comlete spare piece');
        $('#' + SPARE_PIECE_ELS_IDS[DRAGGED_PIECE]).css('visibility', 'initial');
      }
  
      // run their onSnapbackEnd function
      if (cfg.hasOwnProperty('onSnapbackEnd') === true &&
        typeof cfg.onSnapbackEnd === 'function') {
        cfg.onSnapbackEnd(DRAGGED_PIECE, DRAGGED_PIECE_SOURCE,
          deepCopy(CURRENT_POSITION), CURRENT_ORIENTATION);
      }
    }
  
    
    // get source square position
    if(DRAGGED_PIECE_SOURCE == 'spare') {
      var sourceSquarePosition =
  	$('#' + SPARE_PIECE_ELS_IDS[DRAGGED_PIECE]).offset();
      //$('#' + SPARE_PIECE_ELS_IDS[DRAGGED_PIECE]).css('visibility', 'block');
    }
    else {
      var sourceSquarePosition =
      $('#' + SQUARE_ELS_IDS[DRAGGED_PIECE_SOURCE]).offset();
  
    }
    console.log(sourceSquarePosition, DRAGGED_PIECE, DRAGGED_PIECE_SOURCE);
    // animate the piece to the target square
    var opts = {
      duration: cfg.snapbackSpeed,
      complete: complete
    };
    draggedPieceEl.animate(sourceSquarePosition, opts);
  
    // set state
    DRAGGING_A_PIECE = false;
  }
  
  function trashDraggedPiece() {
    removeSquareHighlights();
  
    // remove the source piece
    var newPosition = deepCopy(CURRENT_POSITION);
    delete newPosition[DRAGGED_PIECE_SOURCE];
    setCurrentPosition(newPosition);
  
    // redraw the position
    drawPositionInstant();
  
    // hide the dragged piece
    draggedPieceEl.fadeOut(cfg.trashSpeed);
  
    // set state
    DRAGGING_A_PIECE = false;
  }
  
  function dropDraggedPieceOnSquare(square) {
    removeSquareHighlights();
  
    // update position
    var newPosition = deepCopy(CURRENT_POSITION);
    delete newPosition[DRAGGED_PIECE_SOURCE];
    newPosition[square] = DRAGGED_PIECE;
    setCurrentPosition(newPosition);
  
    // get target square information
    var targetSquarePosition = $('#' + SQUARE_ELS_IDS[square]).offset();
  
    // animation complete
    var complete = function() {
      drawPositionInstant();
      draggedPieceEl.css('display', 'none');
  
      // execute their onSnapEnd function
      if (cfg.hasOwnProperty('onSnapEnd') === true &&
        typeof cfg.onSnapEnd === 'function') {
        cfg.onSnapEnd(DRAGGED_PIECE_SOURCE, square, DRAGGED_PIECE);
      }
    };
  
    // snap the piece to the target square
    var opts = {
      duration: cfg.snapSpeed,
      complete: complete
    };
    draggedPieceEl.animate(targetSquarePosition, opts);
  
    // set state
    DRAGGING_A_PIECE = false;
  }
  
  function beginDraggingPiece(source, piece, x, y) {
    // run their custom onDragStart function
    // their custom onDragStart function can cancel drag start
    if (typeof cfg.onDragStart === 'function' &&
        cfg.onDragStart(source, piece,
          deepCopy(CURRENT_POSITION), CURRENT_ORIENTATION) === false) {
      return;
    }
  
    // set state
    DRAGGING_A_PIECE = true;
    DRAGGED_PIECE = piece;
    DRAGGED_PIECE_SOURCE = source;
  
    // if the piece came from spare pieces, location is offboard
    if (source === 'spare') {
      DRAGGED_PIECE_LOCATION = 'offboard';
    }
    else {
      DRAGGED_PIECE_LOCATION = source;
    }
  
    // capture the x, y coords of all squares in memory
    captureSquareOffsets();
  
    // create the dragged piece
    draggedPieceEl.attr('src', buildPieceImgSrc(piece))
      .css({
        display: '',
        position: 'absolute',
        left: x - (SQUARE_SIZE / 2),
        top: y - (SQUARE_SIZE / 2)
      });
    
    if (source !== 'spare') {
      // highlight the source square and hide the piece
      $('#' + SQUARE_ELS_IDS[source]).addClass(CSS.highlight1)
        .find('.' + CSS.piece).css('display', 'none'); 
    }
    if (source == 'spare') {
      var x = $('#' + pieceId).css('visibility');
      console.log('x = ',x)
      var pieceId = SPARE_PIECE_ELS_IDS[piece];
      $('#' + pieceId).css('visibility', 'hidden');
  
    }
  }
  
  function updateDraggedPiece(x, y) {
    // put the dragged piece over the mouse cursor
    draggedPieceEl.css({
      left: x - (SQUARE_SIZE / 2),
      top: y - (SQUARE_SIZE / 2)
    });
  
    // get location
    var location = isXYOnSquare(x, y);
  
    // do nothing if the location has not changed
    if (location === DRAGGED_PIECE_LOCATION) return;
  
    // remove highlight from previous square
    if (validSquare(DRAGGED_PIECE_LOCATION) === true) {
      $('#' + SQUARE_ELS_IDS[DRAGGED_PIECE_LOCATION])
        .removeClass(CSS.highlight2);
    }
  
    // add highlight to new square
    if (validSquare(location) === true) {
      $('#' + SQUARE_ELS_IDS[location]).addClass(CSS.highlight2);
    }
  
    // run onDragMove
    if (typeof cfg.onDragMove === 'function') {
      cfg.onDragMove(location, DRAGGED_PIECE_LOCATION,
        DRAGGED_PIECE_SOURCE, DRAGGED_PIECE,
        deepCopy(CURRENT_POSITION), CURRENT_ORIENTATION);
    }
  
    // update state
    DRAGGED_PIECE_LOCATION = location;
  }
  
  function stopDraggedPiece(location) {
    // determine what the action should be
    
    console.log('Stop Dragged Piece');
    var action = 'drop';
    if (location === 'offboard' && cfg.dropOffBoard === 'snapback') {
      action = 'snapback';
    }
    if (location === 'offboard' && cfg.dropOffBoard === 'trash') {
      action = 'snapback';
    }
  
    // run their onDrop function, which can potentially change the drop action
    if (cfg.hasOwnProperty('onDrop') === true &&
      typeof cfg.onDrop === 'function') {
      var newPosition = deepCopy(CURRENT_POSITION);
  
      // source piece is a spare piece and position is off the board
      //if (DRAGGED_PIECE_SOURCE === 'spare' && location === 'offboard') {...}
      // position has not changed; do nothing
  
      // source piece is a spare piece and position is on the board
      if (DRAGGED_PIECE_SOURCE === 'spare' && validSquare(location) === true) {
        // add the piece to the board
        newPosition[location] = DRAGGED_PIECE;
      }
  
      // source piece was on the board and position is off the board
      if (validSquare(DRAGGED_PIECE_SOURCE) === true && location === 'offboard') {
        // remove the piece from the board
        delete newPosition[DRAGGED_PIECE_SOURCE];
      }
  
      // source piece was on the board and position is on the board
      if (validSquare(DRAGGED_PIECE_SOURCE) === true &&
        validSquare(location) === true) {
        // move the piece
        delete newPosition[DRAGGED_PIECE_SOURCE];
        newPosition[location] = DRAGGED_PIECE;
      }
  
      var oldPosition = deepCopy(CURRENT_POSITION);
  
      var result = cfg.onDrop(DRAGGED_PIECE_SOURCE, location, DRAGGED_PIECE,
        newPosition, oldPosition, CURRENT_ORIENTATION);
      if (result === 'snapback' || result === 'trash') {
        action = result;
      }
    }
  
    // do it!
    if (action === 'snapback') {
      snapbackDraggedPiece();
    }
    else if (action === 'trash') {
      trashDraggedPiece();
    }
    else if (action === 'drop') {
      dropDraggedPieceOnSquare(location);
    }
  }
  
  //------------------------------------------------------------------------------
  // Public Methods
  //------------------------------------------------------------------------------
  
  // clear the board
  widget.clear = function(useAnimation) {
    widget.position({}, useAnimation);
  };
  
  /*
  // get or set config properties
  // TODO: write this, GitHub Issue #1
  widget.config = function(arg1, arg2) {
    // get the current config
    if (arguments.length === 0) {
      return deepCopy(cfg);
    }
  };
  */
  
  // remove the widget from the page
  widget.destroy = function() {
    // remove markup
    containerEl.html('');
    draggedPieceEl.remove();
  
    // remove event handlers
    containerEl.unbind();
  };
  
  // shorthand method to get the current FEN
  widget.fen = function() {
    return widget.position('fen');
  };
  
  // flip orientation
  widget.flip = function() {
    widget.orientation('flip');
  };
  
  /*
  // TODO: write this, GitHub Issue #5
  widget.highlight = function() {
  
  };
  */
  
  // move pieces
  widget.move = function() {
    // no need to throw an error here; just do nothing
    if (arguments.length === 0) return;
  
    var useAnimation = true;
  
    // collect the moves into an object
    var moves = {};
    for (var i = 0; i < arguments.length; i++) {
      // any "false" to this function means no animations
      if (arguments[i] === false) {
        useAnimation = false;
        continue;
      }
  
      // skip invalid arguments
      if (validMove(arguments[i]) !== true) {
        error(2826, 'Invalid move passed to the move method.', arguments[i]);
        continue;
      }
  
      var tmp = arguments[i].split('-');
      moves[tmp[0]] = tmp[1];
    }
  
    // calculate position from moves
    var newPos = calculatePositionFromMoves(CURRENT_POSITION, moves);
  
    // update the board
    widget.position(newPos, useAnimation);
  
    // return the new position object
    return newPos;
  };
  
  widget.orientation = function(arg) {
    // no arguments, return the current orientation
    if (arguments.length === 0) {
      return CURRENT_ORIENTATION;
    }
  
    // set to white or black
    if (arg === 'white' || arg === 'black') {
      CURRENT_ORIENTATION = arg;
      drawBoard();
      return;
    }
  
    // flip orientation
    if (arg === 'flip') {
      CURRENT_ORIENTATION = (CURRENT_ORIENTATION === 'white') ? 'black' : 'white';
      drawBoard();
      return;
    }
  
    error(5482, 'Invalid value passed to the orientation method.', arg);
  };
  
  widget.position = function(position, useAnimation) {
    // no arguments, return the current position
    if (arguments.length === 0) {
      return deepCopy(CURRENT_POSITION);
    }
  
    // get position as FEN
    if (typeof position === 'string' && position.toLowerCase() === 'fen') {
      return objToFen(CURRENT_POSITION);
    }
  
    // default for useAnimations is true
    if (useAnimation !== false) {
      useAnimation = true;
    }
  
    // start position
    if (typeof position === 'string' && position.toLowerCase() === 'start') {
      position = deepCopy(START_POSITION);
    }
  
    // convert FEN to position object
    if (validFen(position) === true) {
      position = fenToObj(position);
    }
  
    // validate position object
    if (validPositionObject(position) !== true) {
      error(6482, 'Invalid value passed to the position method.', position);
      return;
    }
  
    if (useAnimation === true) {
      // start the animations
      doAnimations(calculateAnimations(CURRENT_POSITION, position),
        CURRENT_POSITION, position);
  
      // set the new position
      setCurrentPosition(position);
    }
    // instant update
    else {
      setCurrentPosition(position);
      drawPositionInstant();
    }
  };
  
  widget.resize = function() {
    // calulate the new square size
    SQUARE_SIZE = calculateSquareSize();
  
    // set board width
    boardEl.css('width', (SQUARE_SIZE * cfg.boardSize) + 'px');
  
    // set drag piece size
    draggedPieceEl.css({
      height: SQUARE_SIZE,
      width: SQUARE_SIZE
    });
  
    // spare pieces
    if (cfg.sparePieces === true) {
      containerEl.find('.' + CSS.sparePieces)
        .css('text-align', 'center');
    }
  
    // redraw the board
    drawBoard();
  };
  
  // set the starting position
  widget.start = function(useAnimation) {
    widget.position('start', useAnimation);
  };
  
  //------------------------------------------------------------------------------
  // Browser Events
  //------------------------------------------------------------------------------
  
  function isTouchDevice() {
    return ('ontouchstart' in document.documentElement);
  }
  
  // reference: http://www.quirksmode.org/js/detect.html
  function isMSIE() {
    return (navigator && navigator.userAgent &&
        navigator.userAgent.search(/MSIE/) !== -1);
  }
  
  function stopDefault(e) {
    e.preventDefault();
  }
  
  function mousedownSquare(e) {
    // do nothing if we're not draggable
    if (cfg.draggable !== true) return;
  
    var square = $(this).attr('data-square');
    // no piece on this square
    if (validSquare(square) !== true ||
        CURRENT_POSITION.hasOwnProperty(square) !== true) {
      return;
    }
  
    beginDraggingPiece(square, CURRENT_POSITION[square], e.pageX, e.pageY);
  }
  
  function touchstartSquare(e) {
    // do nothing if we're not draggable
    if (cfg.draggable !== true) return;
  
    var square = $(this).attr('data-square');
  
    // no piece on this square
    if (validSquare(square) !== true ||
        CURRENT_POSITION.hasOwnProperty(square) !== true) {
      return;
    }
  
    e = e.originalEvent;
    beginDraggingPiece(square, CURRENT_POSITION[square],
      e.changedTouches[0].pageX, e.changedTouches[0].pageY);
  }
  
  function mousedownSparePiece(e) {
    // do nothing if sparePieces is not enabled
    if (cfg.sparePieces !== true) return;
  
    var piece = $(this).attr('data-piece');
  
    beginDraggingPiece('spare', piece, e.pageX, e.pageY);
  }
  
  function touchstartSparePiece(e) {
    // do nothing if sparePieces is not enabled
    if (cfg.sparePieces !== true) return;
  
    var piece = $(this).attr('data-piece');
  
    e = e.originalEvent;
    beginDraggingPiece('spare', piece,
      e.changedTouches[0].pageX, e.changedTouches[0].pageY);
  }
  
  function mousemoveWindow(e) {
    // do nothing if we are not dragging a piece
    if (DRAGGING_A_PIECE !== true) return;
  
    updateDraggedPiece(e.pageX, e.pageY);
  }
  
  function touchmoveWindow(e) {
    // do nothing if we are not dragging a piece
    if (DRAGGING_A_PIECE !== true) return;
  
    // prevent screen from scrolling
    e.preventDefault();
  
    updateDraggedPiece(e.originalEvent.changedTouches[0].pageX,
      e.originalEvent.changedTouches[0].pageY);
  }
  
  function mouseupWindow(e) {
    // do nothing if we are not dragging a piece
    if (DRAGGING_A_PIECE !== true) return;
  
    // get the location
    var location = isXYOnSquare(e.pageX, e.pageY);
  
    stopDraggedPiece(location);
  }
  
  function touchendWindow(e) {
    // do nothing if we are not dragging a piece
    if (DRAGGING_A_PIECE !== true) return;
  
    // get the location
    var location = isXYOnSquare(e.originalEvent.changedTouches[0].pageX,
      e.originalEvent.changedTouches[0].pageY);
  
    stopDraggedPiece(location);
  }
  
  function mouseenterSquare(e) {
    // do not fire this event if we are dragging a piece
    // NOTE: this should never happen, but it's a safeguard
    if (DRAGGING_A_PIECE !== false) return;
  
    if (cfg.hasOwnProperty('onMouseoverSquare') !== true ||
      typeof cfg.onMouseoverSquare !== 'function') return;
  
    // get the square
    var square = $(e.currentTarget).attr('data-square');
  
    // NOTE: this should never happen; defensive
    if (validSquare(square) !== true) return;
  
    // get the piece on this square
    var piece = false;
    if (CURRENT_POSITION.hasOwnProperty(square) === true) {
      piece = CURRENT_POSITION[square];
    }
  
    // execute their function
    cfg.onMouseoverSquare(square, piece, deepCopy(CURRENT_POSITION),
      CURRENT_ORIENTATION);
  }
  
  function mouseleaveSquare(e) {
    // do not fire this event if we are dragging a piece
    // NOTE: this should never happen, but it's a safeguard
    if (DRAGGING_A_PIECE !== false) return;
  
    if (cfg.hasOwnProperty('onMouseoutSquare') !== true ||
      typeof cfg.onMouseoutSquare !== 'function') return;
  
    // get the square
    var square = $(e.currentTarget).attr('data-square');
  
    // NOTE: this should never happen; defensive
    if (validSquare(square) !== true) return;
  
    // get the piece on this square
    var piece = false;
    if (CURRENT_POSITION.hasOwnProperty(square) === true) {
      piece = CURRENT_POSITION[square];
    }
  
    // execute their function
    cfg.onMouseoutSquare(square, piece, deepCopy(CURRENT_POSITION),
      CURRENT_ORIENTATION);
  }
  
  //------------------------------------------------------------------------------
  // Initialization
  //------------------------------------------------------------------------------
  
  function addEvents() {
    // prevent browser "image drag"
    $('body').on('mousedown mousemove', '.' + CSS.piece, stopDefault);
  
    // mouse drag pieces
    boardEl.on('mousedown', '.' + CSS.square, mousedownSquare);
    containerEl.on('mousedown', '.' + CSS.sparePieces + ' .' + CSS.piece,
      mousedownSparePiece);
  
    // mouse enter / leave square
    boardEl.on('mouseenter', '.' + CSS.square, mouseenterSquare);
    boardEl.on('mouseleave', '.' + CSS.square, mouseleaveSquare);
  
    // IE doesn't like the events on the window object, but other browsers
    // perform better that way
    if (isMSIE() === true) {
      // IE-specific prevent browser "image drag"
      document.ondragstart = function() { return false; };
  
      $('body').on('mousemove', mousemoveWindow);
      $('body').on('mouseup', mouseupWindow);
    }
    else {
      $(window).on('mousemove', mousemoveWindow);
      $(window).on('mouseup', mouseupWindow);
    }
  
    // touch drag pieces
    if (isTouchDevice() === true) {
      boardEl.on('touchstart', '.' + CSS.square, touchstartSquare);
      containerEl.on('touchstart', '.' + CSS.sparePieces + ' .' + CSS.piece,
        touchstartSparePiece);
      $(window).on('touchmove', touchmoveWindow);
      $(window).on('touchend', touchendWindow);
    }
  }
  
  function initDom() {
    // build board and save it in memory
    containerEl.html(buildBoardContainer());
    boardEl = containerEl.find('.' + CSS.board);
  
    if (cfg.sparePieces === true) {
      sparePiecesTopEl = containerEl.find('.' + CSS.sparePiecesTop);
      sparePiecesBottomEl = containerEl.find('.' + CSS.sparePiecesBottom);
    }
  
    // create the drag piece
    var draggedPieceId = createId();
    $('body').append(buildPiece('wP', true, draggedPieceId));
    draggedPieceEl = $('#' + draggedPieceId);
  
    // get the border size
    BOARD_BORDER_SIZE = parseInt(boardEl.css('borderLeftWidth'), 10);
  
    // set the size and draw the board
    widget.resize();
  }
  
  function init() {
    if (checkDeps() !== true ||
        expandConfig() !== true) return;
  
    // create unique IDs for all the elements we will create
    createElIds();
  
    initDom();
    addEvents();
  }
  
  // go time
  init();
  
  // return the widget object
  return widget;
  
  }; // end window.ChessBoard
  
  // expose util functions
  window.ChessBoard.fenToObj = fenToObj;
  window.ChessBoard.objToFen = objToFen;
  
  })(); // end anonymous wrapper
  