Always based on @ivan444 work, I have completed my previous work on "support for smaller boards"

I use it without problem and it seems to work quite nice.

chessboard-1.1.1.js.zip

You can even use this feature with chess.js using a piece of code like below in order to "normalize" your fen string.

// Used to normalize a fen string from smaller board to "normal" chess board
// dimBoardLength: the number of squares in a row/column
function normalizeFenString(fen, dimBoardLength) {
	var deltaFen = 8 - dimBoardLength;
	var position = fen;
	
	if (deltaFen > 0) {
		var fenBegin = fen.replace(/ .+$/, '');
		var fenEnd = fen.replace(fenBegin, '');
		var rows = fenBegin.split('/');

		position = "";
		for (var i = 0; i < deltaFen; i++) {
			if (position != "") {
				position += "/";
			}
			position += "8";
		}
		for (var i = 0; i < rows.length; i++) {
			var c = rows[i].slice(-1);
			if (c.search(/[1-8]/) !== -1) {
				position += "/" + rows[i].substring(0, rows[i].length - 1) + (parseInt(c, 10) + deltaFen).toString();
			} else {
				position += "/" + rows[i] + deltaFen.toString();
			}
		}
		
		position += fenEnd;
	}
	
	return position;
}

Feature request: allow boards smaller than 8x8 #198

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