Answers.Body: <p><strong>Attacking/Defending the empty house</strong></p>
  
  <p>This is going to be a long answer that will require several edits to complete, but I wanted there to be an answer started.</p>
  
  <p>Not moving a pawn in front of the king leads it to be vulnerable to back rank mates. Moving a pawn in front of the king (making luft) creates holes that can be exploited (particularly by knights). Each disturbance has its own peculiarities. CJS Purdy wrote an article that started to outline the weaknesses of the various pawn structures, but he barely scratched the surface of the problem.</p>
  
  <p>In this <strong>first example</strong> Judit Polgar defends a piece with tactics. Her opponent takes the piece, giving up her fianchettoed bishop, and is promptly punished for the crass materialism. It is important when winning material with the use of the bishop, to check that you are not leaving yourself open. Particularly if your opponent retains his corresponding bishop.  I wrote a blog post that expands on this example <a href="http://newshutzchess.blogspot.com/2012/04/vulnerability-and-kingside-fianchetto.html">here</a></p>
  
  <pre>
  <code>
  [Event "Thessaloniki"]
  [Site "Thessaloniki"]
  [Date "1988.??.??"]
  [EventDate "?"]
  [Round "?"]
  [Result "1-0"]
  [White "Judit Polgar"]
  [Black "Pavlina Angelova"]
  [ECO "B31"]
  [WhiteElo "?"]
  [BlackElo "?"]
  [PlyCount "33"]
  
  [FEN ""]
  1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.c3 e5 6.d4 exd4 7.cxd4
  Nxd4 8.Nxd4 cxd4 9.e5 Ne7 10.Bg5 O-O 11.Qxd4 Nc6 12.Qh4 Qb6
  13.Nc3 Bxe5 14.Rae1 Bxc3 15.bxc3 Qxb5 16.Qh6 Qf5 17.Qxf8+ 1-0
  </code>
  </pre>
  
  <p>White will mate with Bh6+ and Re8#. This is a variety of back rank mate. </p>
  
  <p>In this <strong>second example</strong>, a current line from the Catalan Opening, White gives up his fianchettoed bishop for a pawn, but leaving black with the corresponding bishop and better development. All white has is the pawn, but this position is considered a slight edge for white.</p>
  
  <pre>
  <code>
  [Event "?"]
  [Site "?"]
  [Date "????.??.??"]
  [Round "?"]
  [White "Open Catalan"]
  [Black "Theory Line"]
  [Result "*"]
  [PlyCount "27"]
  
  [FEN ""]
  
  1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Be7 5. Bg2 O-O 6. O-O dxc4 7. Ne5 Nc6 8.
  Bxc6 bxc6 9. Nxc6 Qe8 10. Nxe7+ Qxe7 11. Qa4 e5 12. dxe5 Qxe5 13. Qxc4 Be6 14.
  Qd3 *
  </code>
  </pre>
  
  <p>White will block the long diagonal with f2-f3 and e2-e4 as needed. He will defend the g2 square with heavy pieces, and eventually gain pressure on blacks c7-pawn. White may need to return the b2-pawn.</p>
  
  <hr>
  
  <p><strong>h-file attack</strong></p>
  
  <p>This is the way many approach prying open the fianchettoed king. The variation against the Pirc defense is named the 150-attack after the British rating system for about 1700 ELO. It fails miserably against the Gruenfeld, because the center is too open for a wing attack, and has trouble against the KID, because white's c2-c4 move is mostly wasted, and makes the white king less safe on the queenside, but if black plays passively, it can work. This plan is most famous in the Yugoslav dragon, but black has found many resources that have caused white to shift to more flexible plans in the Yugoslav.</p>
  
  <p>The key elements are:</p>
  
  <ol>
  <li>a bishop and queen battery on e3 and d2 respectfully, The bishop will go to h6 and trade off the bishop on g7</li>
  <li>pawns on e4 and f3, that protect the battery and support g2-g4</li>
  <li>queenside castling to allow both rooks to come to the h-file</li>
  <li>the advance of the h-pawn to trade on g6 and open the h-file</li>
  <li>one or more rook sacrifices on the h-file to open things up.</li>
  </ol>
  
  <p>Here is a manufactured game that shows the basic plan. Black plays many time wasting moves that modern players of the Dragon would not play.</p>
  
  <pre>
  <code>
  [Event "?"]
  [Site "?"]
  [Date "????.??.??"]
  [Round "?"]
  [White "Sicilian Dragon,Yugoslav Attack"]
  [Black "Too slow, too late"]
  [Result "1-0"]
  [PlyCount "47"]
  
  [FEN ""]
  1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Nc6 7. f3 Bg7 8. Qd2
  O-O 9. O-O-O Bd7 10. h4 Qa5 11. g4 Rfc8 12. Nb3 Qc7 13. h5 Ne5 14. Be2 b5 15.
  hxg6 fxg6 16. Bh6 b4 17. Nd5 Nxd5 18. Bxg7 Kxg7?? 19. Qh6+ Kf6 20. g5+ Kf7 21.
  Qxh7+ Kf8 22. Qh8+ Kf7 23. Rh7+ Ke6 24. Nd4# 1-0
  
  </code>
  </pre>
  
  <p>To handle this attack, it is of critical importance for black to get an attack rolling quickly on the queenside or the center, and not to panic. 18...Kxg7?? is a huge blunder, while 18...Ne3 saves, as 19.Qxe3?? Qxc2#</p>
  
  <p>Other ideas to keep in mind:</p>
  
  <ul>
  <li>open up the center. This is one way that KID players try to disrupt the Saemisch</li>
  <li>sometimes h7-h5 can be played to block the opening of the h-file. This is risky if white has a bishop on the a2-g8 diagonal</li>
  <li>trade or divert white's bishop from the c1-h6 diagonal.</li>
  </ul>
  
  <hr>
  
  <p>Next edit will talk about the f-file attack.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-06-20T18:21:50.020Z
Answers.Text: In the Catalan line, what's the explanation for choosing Bxc6 over Nxc6? White seems to be going for an advantage based on the extra pawn and week c7, both of which are hindered by opposite coloured Bishops, while down in development and worried about the King, advantages which the opposite Bishops definitely help.
Answers.UserDisplayName: Chessanator
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-06-22T11:50:34.357Z
Answers.Text: This is likely another question. The short answer is that it depends on concrete variations.
Answers.UserDisplayName: newshutz
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-03-06T14:51:24.623Z
Answers.LastActivityDate: 2014-03-07T16:48:31.513Z
Answers.LastEditDate: 2014-03-07T16:48:31.513Z
Answers.UserDisplayName: newshutz
Body: <p>I'm trying out kings indian against d4 openings but there is one problem... I get mated.</p>
  
  <p>I can't defend after castling under the h7 g6 f7 pawn structure. Somehow it works as an opening with an opening for infiltrating enemy attackers. I.e. the a1-h8 diagonal seems like it is built by traitors on my team. </p>
  
  <p>Now my question to you is, what am I overlooking? How do I defend the g7 square? How do I stop enemies from getting too close to this strange triangle of mine (f6 and h6)? </p>
  
  <p>To be precise: it is this pawn triangle that I can not defend when I have castled under it. Does not matter if it is with white or black pieces, queen side or king side.</p>
  
  <p>EDIT: since I know now what it is called, I am talking about the "<em>house</em>". I am not talking about some specific game or in the opening. It is later in the game, the bishop has probably been sent off for patting nearby pawns. The king is left in the house-of-holes.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-03-05T20:08:28.603Z
Comments.Text: You're putting your dark-squared bishop on g7, right? The pawn structure f7/g6/h7 is quite strong if there is a bishop on g7, and quite weak otherwise.
Comments.UserDisplayName: dfan
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-03-05T20:13:42.183Z
Comments.Text: The KID is an extremely provocative opening, you're allowing white to build a big center and then stand there and say "you can't catch me! you can't catch me! la la la la"... FIGHT that center, break it down, don't allow your Bg7 to be traded or to let white get comfortable. But for a good answer we need to see an actual game.
Comments.UserDisplayName: RemcoGerlich
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-03-05T20:51:46.920Z
Comments.Text: Do not be afraid to post 3 or even 5 of your games with this losing pattern. This is enough games to pin-point your mistakes. I will go through them and tell you what are you doing wrong. It will pose no problem for me, and I am sure other members will help as well. Best regards.
Comments.UserDisplayName: AlwaysLearningNewStuff
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2014-03-05T22:45:49.843Z
Comments.Text: This is a broad topic. Though the fianchetto is a strong defensive structure, there are many tactical patterns: Back rank, open f-file, open h-file, weakened house (pawn advanced to f5, h6, or h5), knight on h6 with bishop pinning the f-pawn, f-pawn push, knights hopping around an empty house, and I am sure I have missed a few.
Comments.UserDisplayName: newshutz
Tags: <opening><theory><fianchetto><kings-indian><grunfeld-defense>
Title: Pawn structure in king's indian or grünfeld
ThreadText: # Pawn structure in king's indian or grünfeld
  
  (Asked by: username_0 on 2014-03-05)
  
  I'm trying out kings indian against d4 openings but there is one problem... I get mated.
  
  I can't defend after castling under the h7 g6 f7 pawn structure. Somehow it works as an opening with an opening for infiltrating enemy attackers. I.e. the a1-h8 diagonal seems like it is built by traitors on my team.
  
  Now my question to you is, what am I overlooking? How do I defend the g7 square? How do I stop enemies from getting too close to this strange triangle of mine (f6 and h6)?
  
  To be precise: it is this pawn triangle that I can not defend when I have castled under it. Does not matter if it is with white or black pieces, queen side or king side.
  
  EDIT: since I know now what it is called, I am talking about the "*house*". I am not talking about some specific game or in the opening. It is later in the game, the bishop has probably been sent off for patting nearby pawns. The king is left in the house-of-holes.
  
  **Tags:** opening, theory, fianchetto, kings-indian, grunfeld-defense
  
  > **Comments:**
  > **username_1**: You're putting your dark-squared bishop on g7, right? The pawn structure f7/g6/h7 is quite strong if there is a bishop on g7, and quite weak otherwise.  
  > **username_2**: The KID is an extremely provocative opening, you're allowing white to build a big center and then stand there and say "you can't catch me! you can't catch me! la la la la"... FIGHT that center, break it down, don't allow your Bg7 to be traded or to let white get comfortable. But for a good answer we need to see an actual game.  
  > **username_3**: Do not be afraid to post 3 or even 5 of your games with this losing pattern. This is enough games to pin-point your mistakes. I will go through them and tell you what are you doing wrong. It will pose no problem for me, and I am sure other members will help as well. Best regards.  
  > **username_4**: This is a broad topic. Though the fianchetto is a strong defensive structure, there are many tactical patterns: Back rank, open f-file, open h-file, weakened house (pawn advanced to f5, h6, or h5), knight on h6 with bishop pinning the f-pawn, f-pawn push, knights hopping around an empty house, and I am sure I have missed a few.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_4 on 2014-03-06. Score: 6
  
  **Attacking/Defending the empty house**
  
  This is going to be a long answer that will require several edits to complete, but I wanted there to be an answer started.
  
  Not moving a pawn in front of the king leads it to be vulnerable to back rank mates. Moving a pawn in front of the king (making luft) creates holes that can be exploited (particularly by knights). Each disturbance has its own peculiarities. CJS Purdy wrote an article that started to outline the weaknesses of the various pawn structures, but he barely scratched the surface of the problem.
  
  In this **first example** Judit Polgar defends a piece with tactics. Her opponent takes the piece, giving up her fianchettoed bishop, and is promptly punished for the crass materialism. It is important when winning material with the use of the bishop, to check that you are not leaving yourself open. Particularly if your opponent retains his corresponding bishop. I wrote a blog post that expands on this example [here](http://newshutzchess.blogspot.com/2012/04/vulnerability-and-kingside-fianchetto.html)
  
  ```
  
  [Event "Thessaloniki"]
  [Site "Thessaloniki"]
  [Date "1988.??.??"]
  [EventDate "?"]
  [Round "?"]
  [Result "1-0"]
  [White "Judit Polgar"]
  [Black "Pavlina Angelova"]
  [ECO "B31"]
  [WhiteElo "?"]
  [BlackElo "?"]
  [PlyCount "33"]
  
  [FEN ""]
  1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.c3 e5 6.d4 exd4 7.cxd4
  Nxd4 8.Nxd4 cxd4 9.e5 Ne7 10.Bg5 O-O 11.Qxd4 Nc6 12.Qh4 Qb6
  13.Nc3 Bxe5 14.Rae1 Bxc3 15.bxc3 Qxb5 16.Qh6 Qf5 17.Qxf8+ 1-0
  
  ```
  
  White will mate with Bh6+ and Re8#. This is a variety of back rank mate.
  
  In this **second example**, a current line from the Catalan Opening, White gives up his fianchettoed bishop for a pawn, but leaving black with the corresponding bishop and better development. All white has is the pawn, but this position is considered a slight edge for white.
  
  ```
  
  [Event "?"]
  [Site "?"]
  [Date "????.??.??"]
  [Round "?"]
  [White "Open Catalan"]
  [Black "Theory Line"]
  [Result "*"]
  [PlyCount "27"]
  
  [FEN ""]
  
  1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Be7 5. Bg2 O-O 6. O-O dxc4 7. Ne5 Nc6 8.
  Bxc6 bxc6 9. Nxc6 Qe8 10. Nxe7+ Qxe7 11. Qa4 e5 12. dxe5 Qxe5 13. Qxc4 Be6 14.
  Qd3 *
  
  ```
  
  White will block the long diagonal with f2-f3 and e2-e4 as needed. He will defend the g2 square with heavy pieces, and eventually gain pressure on blacks c7-pawn. White may need to return the b2-pawn.
  
  ---
  
  **h-file attack**
  
  This is the way many approach prying open the fianchettoed king. The variation against the Pirc defense is named the 150-attack after the British rating system for about 1700 ELO. It fails miserably against the Gruenfeld, because the center is too open for a wing attack, and has trouble against the KID, because white's c2-c4 move is mostly wasted, and makes the white king less safe on the queenside, but if black plays passively, it can work. This plan is most famous in the Yugoslav dragon, but black has found many resources that have caused white to shift to more flexible plans in the Yugoslav.
  
  The key elements are:
  
  1. a bishop and queen battery on e3 and d2 respectfully, The bishop will go to h6 and trade off the bishop on g7
  2. pawns on e4 and f3, that protect the battery and support g2-g4
  3. queenside castling to allow both rooks to come to the h-file
  4. the advance of the h-pawn to trade on g6 and open the h-file
  5. one or more rook sacrifices on the h-file to open things up.
  
  Here is a manufactured game that shows the basic plan. Black plays many time wasting moves that modern players of the Dragon would not play.
  
  ```
  
  [Event "?"]
  [Site "?"]
  [Date "????.??.??"]
  [Round "?"]
  [White "Sicilian Dragon,Yugoslav Attack"]
  [Black "Too slow, too late"]
  [Result "1-0"]
  [PlyCount "47"]
  
  [FEN ""]
  1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Nc6 7. f3 Bg7 8. Qd2
  O-O 9. O-O-O Bd7 10. h4 Qa5 11. g4 Rfc8 12. Nb3 Qc7 13. h5 Ne5 14. Be2 b5 15.
  hxg6 fxg6 16. Bh6 b4 17. Nd5 Nxd5 18. Bxg7 Kxg7?? 19. Qh6+ Kf6 20. g5+ Kf7 21.
  Qxh7+ Kf8 22. Qh8+ Kf7 23. Rh7+ Ke6 24. Nd4# 1-0
  
  ```
  
  To handle this attack, it is of critical importance for black to get an attack rolling quickly on the queenside or the center, and not to panic. 18...Kxg7?? is a huge blunder, while 18...Ne3 saves, as 19.Qxe3?? Qxc2#
  
  Other ideas to keep in mind:
  
  * open up the center. This is one way that KID players try to disrupt the Saemisch
  * sometimes h7-h5 can be played to block the opening of the h-file. This is risky if white has a bishop on the a2-g8 diagonal
  * trade or divert white's bishop from the c1-h6 diagonal.
  
  ---
  
  Next edit will talk about the f-file attack.
  
  > **Comments:**
  > **username_5**: In the Catalan line, what's the explanation for choosing Bxc6 over Nxc6? White seems to be going for an advantage based on the extra pawn and week c7, both of which are hindered by opposite coloured Bishops, while down in development and worried about the King, advantages which the opposite Bishops definitely help.  
  > **username_4**: This is likely another question. The short answer is that it depends on concrete variations.  
  
  ---
  
  