a building that is fortified
a stronghold of a permanent nature
a strong place affording defense and protection
A defensive blockade to keep out the enemy forces, especially the king.
important fortified complex, often designed to surround and protect an entire city.
a defensive blockade, keeping out the enemy forces, especially the King. One of the earliest known examples is the fortress White Kc1, Pd3, Re3 which can hold the draw against Black Kc8, Qd8. Try it
a system of defenses designed to work together as a whole to defend a fixed position. Often a permanent fortification.