private Chess(Board board)
{
_board = board;
Fen = board.Fen;
moves = new Moves(_board);
}
public Chess(string fen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
{
Fen = fen;
_board = new Board(fen);
moves = new Moves(_board);
}