Walter Montego: If I understand what an immobilizer is, yes it has such a piece. It is the magician (or wizard I do not know the exact English name). This piece freezes all pieces of your opponent adjacent to the piece itself. The piece of the opponent cannot move, give check or do every other special issues (some exceptions, but that are very special details and very rare circumstances). Another type is the Femme Fatale. All opponent's piece adjacent tot the FF cannot give check and cannot capture a piece. The pieces can move, but they have to retreat without giving check or without capturing something.