Fortress: a practical example
A defender may control all entry squares while keeping a king and piece in a compact formation. Extra material is then difficult to use without creating a breakthrough. Some positions that look like fortresses can still be dismantled by a pawn break.
How to use the idea in your games
Do not declare a fortress solely because an engine evaluation changes slowly. Identify the entry routes, possible sacrifices, and pawn moves that must all be neutralized.
A useful study question
Can you explain fortress in your own words, identify it in a position, and describe when the idea does not apply? Test the explanation on a legal board before relying on it.
Connect the ideas
Endgame, Compensation, Tablebase are useful next concepts. Follow the links to compare definitions and examples, then return to the complete chess glossary whenever an unfamiliar term appears.
Sources & further reading
References checked September 5, 2026. Linked services are independent of ChessRankings.com™.