NOVELTY - The gasifier (10) has a casing (500) having a first end comprising a solid fuel inlet (510) connected to a first lumen defining a drying zone (100) and a pyrolysis zone (200). A kinetic channel (700) defines a reduction zone (400). An air manifold (600) is provided proximal the fluid inlet and fluidly connected to a combustion zone (300) within the first lumen between the second end of the casing and a portion of the kinetic channel. The combustion zone is fluidly connected to the reduction zone via a fluid inlet. A combustion mechanism is thermally connected to the combustion zone.    USE - Hybrid fixed-kinetic bed gasifier for fuel flexible gasification.    ADVANTAGE - Provides a hybrid gasifier that uses a kinetic bed for the gasification phases in which void spaces or gas flow, between solid particles, is advantageous and using a fixed bed for the gasification phases in which void spaces or gas flow is not required. The gasifier passively controls the biomass feed rate, eliminating the need for powered biomass feeders and biomass control systems. By using a kinetic bed for the combustion and reduction phase, the gasifier overcomes the biomass size limitation on fixed bed gasifiers by enabling gas flow through the particulates during combustion and reduction. The gasifier increases the cracking efficiency by separating the tar gas from the char in the combustion zone, via use of a dedicated combustion and cracking chamber. By substantially separating the tar gas combustion from the presence of char, the gasifier reduces the post-combustion cooling effects of char reduction, thus achieving a more preferential tar cracking temperature and residence time. The gasifier has increased thermal efficiency. The possible inclusion of a char grinder between the pyrolysis and combustion zones can normalize the biomass size with a smaller amount of energy input than biomass size reduction through dedicated cutting machines pre-gasifier. The possible inclusion of an internal particulate separator within the kinetic bed minimizes particulate carryover into the egressing gas stream, thus minimizing the size and extent of required filtration systems. The use of a cyclonic kinetic bed enables non-vertical orientation of the gasifier. The hybrid gasifier can be achieved within a single vessel, resulting in a compact and easy to manufacture design.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for gasification of carbon-containing solids; and    (2) a gasification system.    DESCRIPTION OF DRAWING(S) - The drawing shows the cross-sectional view of a variation of the hybrid gasifier.    Hybrid gasifier (10)    Drying zone (100)    Pyrolysis zone (200)    Combustion zone (300)    Reduction zone (400)    Casing (500)    Solid fuel inlet (510)    Air manifold (600)    Kinetic channel (700)