Answers.Body: <p>It's a position with a big material disadvantage that still can be held.</p>
  
  <p>Eg.</p>
  
  <p>White: Kg1 Pg2
  Black: Kd2 Pg3 + Bishop anywhere</p>
  
  <p>You are piece down but the opponent still can't win. Your position is a fortress.</p>
  
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Answers.CreationDate: 2016-11-26T01:37:24.387Z
Answers.Text: Not necessarily a *material* disadvantage.  In Carlsen-Karjakin 10, material was even but White had a large positional advantage (space, Black weaknesses) was trying to break through vs. an attempted Black fortress.
Answers.UserDisplayName: Noam D. Elkies
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Answers.Text: I agree with that, draw by making waiting moves in any worse endgame position is better definition.
Answers.UserDisplayName: hoacin
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Answers.CreationDate: 2016-11-26T09:11:25.873Z
Answers.Text: Also, your definition would include draws forced by perpetual, which is not a fortress.
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Answers.UserDisplayName: hoacin
Answers.Body: <p>A fortress in chess is a position in where the weaker side defends by making waiting moves, and where the stronger side cannot make any progress as long as the defender does not make a crazy move. A very well-known fortress position is the following:</p>
  
  <pre><code>[fen "6k1/6p1/5r1p/8/Q7/8/7P/6K1 w - - 0 1"]
  </code></pre>
  
  <p>It is impossible for white to make any progress if black just moves his king around in the corner, since the black rook denies the white king any possibility to infiltrate as long as it stands on f6. Since the rook is guarded by the g7 pawn, and the g7 pawn is in turn guarded by the black king, the only way to make progress would be to force the black king out of the corner. However, this is not possible.</p>
  
  <p>The way you use it to your advantage in your own games is as always: understand the concept, and recognize when a fortress is possible in your own games.</p>
  
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Body: <p>Throughout the 2016 World Championship match, analysts have made many references to the term "fortress". What does it mean, and how can I use it to my advantage?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-11-25T20:21:04.213Z
Comments.Text: The Wikipedia article is very comprehensive. Did you read it?
Comments.UserDisplayName: user1583209
Tags: <terminology><fortress>
Title: What is a fortress in chess?
ThreadText: # What is a fortress in chess?
  
  (Asked by: username_0 on 2016-11-25)
  
  Throughout the 2016 World Championship match, analysts have made many references to the term "fortress". What does it mean, and how can I use it to my advantage?
  
  **Tags:** terminology, fortress
  
  > **Comments:**
  > **username_1**: The Wikipedia article is very comprehensive. Did you read it?  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_4 on 2016-11-26. Score: 16 | Accepted answer
  
  A fortress in chess is a position in where the weaker side defends by making waiting moves, and where the stronger side cannot make any progress as long as the defender does not make a crazy move. A very well-known fortress position is the following:
  
  ```
  [fen "6k1/6p1/5r1p/8/Q7/8/7P/6K1 w - - 0 1"]
  
  ```
  
  It is impossible for white to make any progress if black just moves his king around in the corner, since the black rook denies the white king any possibility to infiltrate as long as it stands on f6. Since the rook is guarded by the g7 pawn, and the g7 pawn is in turn guarded by the black king, the only way to make progress would be to force the black king out of the corner. However, this is not possible.
  
  The way you use it to your advantage in your own games is as always: understand the concept, and recognize when a fortress is possible in your own games.
  
  
  ---
  
  ### Answer by username_2 on 2016-11-25. Score: 3
  
  It's a position with a big material disadvantage that still can be held.
  
  Eg.
  
  White: Kg1 Pg2
  Black: Kd2 Pg3 + Bishop anywhere
  
  You are piece down but the opponent still can't win. Your position is a fortress.
  
  > **Comments:**
  > **username_3**: Not necessarily a *material* disadvantage.  In Carlsen-Karjakin 10, material was even but White had a large positional advantage (space, Black weaknesses) was trying to break through vs. an attempted Black fortress.  
  > **username_2**: I agree with that, draw by making waiting moves in any worse endgame position is better definition.  
  > **username_1**: Also, your definition would include draws forced by perpetual, which is not a fortress.  
  
  ---
  
  