fen() method

[Hejazi23]

Hello
I simply did some change on your sample code like this:

//require 'vendor/autoload.php';
include "./src/Piece.php";
include "./src/Board.php";
include "./src/Move.php";
include "./src/Validation.php";
include "./src/History.php";
include "./src/Entry.php";
//include "./src/

include "./src/Chess.php";
include "./src/Output/BasicOutput.php";
//include "./src/Output/UnicodeOutput.php";
//include "./src/Output/OutputInterface.php";

use \PChess\Chess\Chess;
use \PChess\Chess\Output\UnicodeOutput;

$cnt=0;
$chess = new Chess();
while (!$chess->gameOver() && (++$cnt<=100) ) {
$moves = $chess->moves();
$move = $moves[random_int(0, count($moves) - 1)];
echo $move."
";
$chess->move($move);
echo $chess->fen()."
";
}

The problem is that "fen" method always the same result without any errors or exceptions.
it seems that the board is not changing. What is going wrong ? Did I miss something
( PHP Version is 8.3.14 )
Thanks