Answers.Body: <p>The game you refer to is <a href="http://www.chessgames.com/perl/chessgame?gid=1019452" rel="nofollow noreferrer">Bobby-Fischer - Ulf Andersson, Siegen 1970</a>.</p>
  
  <p>It is famous for Fischer introducing the impressive plan Kh1,Rg1,g4,Rg3,Rag1 that has often been used since in hedgehog position, mainly for Black.</p>
  
  <blockquote>
    <p><em>White chose to activate his Knight with Ne4. Of course, he will have to play g4 to prevent …f5</em></p>
  </blockquote>
  
  <p>Actually ...f5 is pretty hard for Black to engineer in that kind of position: he has to prevent Neg5 and Nc5, to provide support for his Pe5, and he won't be threatening ...e4 nor ...f4 any time soon. Note that the Re8-Bf8 dispositif is better suited for queenside play while keeping a solid f6-e5 center, the plans would be different in a position with Bb6 and Rf8 for instance.</p>
  
  <p>Fischer's g2-g4 is actually is much deeper plan than just securing the Ne4: it more generally grab space on the kingside (e4 but also f5 for a Knight, g3 for a rook) and threaten g4-g5 at a suitable moment to open the long diagonal for the Bb2 and the g-file for the rooks.</p>
  
  <blockquote>
    <p><em>Black can play Nb6-d7-c5, attacking b3 and -- more importantly -- d3. This also places the knight on a better square, as it was doing nothing on d5.</em></p>
  </blockquote>
  
  <p>This is reasonnable enough, but White can hold on b3 and d3 without too much trouble. In later years, Qb1-Bd1-Bc2 would even become fashionable, even if it probably wasn't in Fischer's mind back in 1970. This regrouping secures both pawns and adds pressure on the diagonals toward the kingside when the game opens up, most often with d3-d4.</p>
  
  <p>Moreover, after White's Ne4, it is not sure that Black Knight will reach c5 at all. Supposing it does, it would still be sensitive to tempo-gaining freeing move like b3-b4 and d3-d4.</p>
  
  <p>Finally, I beg to differ about the Nd5. Although it is screening the pressure on the d-file, it is not "doing nothing": control of b4, e3 and f4 stops White from trying the most agressive plans with b3-b4 or f2-f4. Generally speaking, central squares that your opponent's pawns can't control are considered good spots for your knights.</p>
  
  <blockquote>
    <p><em>An alternative is also Nb6-d7 and f5-f4.</em></p>
  </blockquote>
  
  <p>This however is a very bad plan. Even if Black was granted four free moves to achieve it without White moving at all, it would result in passive pieces (Nc6,Nd7,Re8) holding to the backward pawn on e5 that will be firmly blocked (Ne4) and under fire (Bb2, Nf3, possibly Qa1 or Nc4). </p>
  
  <p>And what do you try to gain with f5-f4 ? An attack on Pe3 ? For that purpose you wouldn't want to retreat your Nd5 to d7. Opening the f-file or the a7-g1 diagonal ?  Well, you have Re8-Bf8, not Rf8-Bb6. I see no reason for White to be afraid of f5-f4.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-11-29T10:26:58.190Z
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Answers.UserDisplayName: Evargalo
Answers.Body: <p>This is not NN-NN, but Fischer-Andersson from 1970.
  Fischer played Kg1 here.
  The position is complex, but white definitely has the afdvantage due to his better/more compact pawn structure, although the pawns are unadvanced.
  I guess Fischer chose the best plan, however, in general, the Nimzovich-Larsen Attack, starting with 1.b3, is a bit dubious.
  In above game, Andersson played 3...Nf6, which is inaccurate, black should have continued with 3...g6 and then Bg7 instead, to neutralise the b2 bishop.
  After played Nf6 and Be7, the white bishop on b2 already targets the knight on f6 and the g7 shelter square. In case the black bishop had been developed on g7, all those threats would not have existed.
  Another very salient feature of above-posted position is that white has 2 central pawns, on e and d files, while black only 1, on the e file. Central pawns are very valuable, so the d3 white pawn is very strong, although unadvanced.
  Andersson later made a positional blunder with d7-d5, and Fischer captured cd5, but that was theory at that time and maybe still is. Top GMs made an awful lot of positional mistakes at those times...</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-11-29T09:42:11.077Z
Answers.Text: 9...d7-d5(!) is no more a *positional blunder* for Black in this game than 3.d2-d4 for White in the main line Sicilian.
Answers.UserDisplayName: Evargalo
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Answers.Text: Yes, it is. Pawn structures are quite different. There is a reason why Andersson lost, and it starts in the very opening. And yes, that is why the Sicilian is a good opening for black and scores excellently(51-49), precisely because a less important semi-central c pawn is traded for a more central d file pawn. In the Fischer game, another factor was white's first move advantage.
Answers.UserDisplayName: Lyudmil Tsvetkov
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Answers.UserDisplayName: Lyudmil Tsvetkov
Answers.Body: <p>White can play d4! And in the line you gave with Ne4, the idea of preparing g4 is not the only plan.  The knight can head to c5 himself.</p>
  
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Answers.CreationDate: 2017-11-29T03:38:23.613Z
Answers.Text: Black would trade his bad, inactive dark-squared bishop for the active c5 knight. D4 would only help black use his dark squared bishop after ...Bd6.
Answers.UserDisplayName: Jossie Calderon
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Answers.Text: That is thematic for White in these English type positions.
Answers.UserDisplayName: Ywapom
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Answers.Text: It's thematic for Black to activate his pieces?
Answers.UserDisplayName: Jossie Calderon
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Answers.CreationDate: 2017-11-29T23:29:44.433Z
Answers.Text: It is thematic for White to control c5.  There are countless games where White puts a knight or bishop on c5 which can be traded off by Blacks bishop.
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Answers.UserDisplayName: Ywapom
Body: <p>In the below position, White chose to activate his Knight with Ne4. Of course, he will have to play g4 to prevent …f5, and that requires the moves Kh1 and Rg1. These were the moves played in the game.</p>
  
  <pre><code>r2qrbk1/1pp3pp/2n1bp2/p2np3/8/PP1PPN2/1BQNBPPP/R4RK1 w - - 0 1
  </code></pre>
  
  <p>In the game, Black played Qd7-f7 and Rad8. Although this does put pressure on the b3 and d3 pawns, it cannot be sufficient to warrant a capture. This also weakens Black's hold on the a5 pawn.</p>
  
  <p>Instead, Black can play Nb6-d7-c5, attacking b3 and -- more importantly -- d3. This also places the knight on a better square, as it was doing nothing on d5. An alternative is also Nb6-d7 and f5-f4. What recourse does White have here?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-11-29T09:39:15.013Z
Comments.Text: I think you should precise in the question that this position comes from the famous game Bobby Fischer - Ulf Andersson in 1970: http://www.chessgames.com/perl/chessgame?gid=1019452 . The birth of the plan with Kh1-Rg1-g4 in the (reverse) Hedgehog !
Comments.UserDisplayName: Evargalo
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Comments.CreationDate: 2017-11-29T11:13:26.020Z
Comments.Text: Your comments seem strange to me (2000 ELO). The knight might be slightly better on c5 then d5 (I'm not even sure about that) but you can't possibly spend three moves getting it there. Then you talk about Black's hold on the a5 pawn weakening ... what White pieces are attacking a5? (None). The position is basically a reversed Sicilian where Black doesn't even have the development lead to compensate for a worse structure.
Comments.UserDisplayName: TheMathemagician
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Comments.CreationDate: 2017-11-29T21:22:28.143Z
Comments.Text: @themathemagician it's a semi-closed position. Three moves is fine. And a7-a5 was played to prevent b4.
Comments.UserDisplayName: Jossie Calderon
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2017-11-29T21:28:17.623Z
Comments.Text: @evargalo that would bias the question. As you can see, everyone (such as deduplicator and others) are taking this position and the moves for granted. It's better to use NN-NN.
Comments.UserDisplayName: Jossie Calderon
Tags: <positional-play>
Title: Why wasn't this strategy chosen?
ThreadText: # Why wasn't this strategy chosen?
  
  (Asked by: username_0 on 2017-11-28)
  
  In the below position, White chose to activate his Knight with Ne4. Of course, he will have to play g4 to prevent …f5, and that requires the moves Kh1 and Rg1. These were the moves played in the game.
  
  ```
  r2qrbk1/1pp3pp/2n1bp2/p2np3/8/PP1PPN2/1BQNBPPP/R4RK1 w - - 0 1
  
  ```
  
  In the game, Black played Qd7-f7 and Rad8. Although this does put pressure on the b3 and d3 pawns, it cannot be sufficient to warrant a capture. This also weakens Black's hold on the a5 pawn.
  
  Instead, Black can play Nb6-d7-c5, attacking b3 and -- more importantly -- d3. This also places the knight on a better square, as it was doing nothing on d5. An alternative is also Nb6-d7 and f5-f4. What recourse does White have here?
  
  **Tags:** positional-play
  
  > **Comments:**
  > **username_1**: I think you should precise in the question that this position comes from the famous game Bobby Fischer - Ulf Andersson in 1970: http://www.chessgames.com/perl/chessgame?gid=1019452 . The birth of the plan with Kh1-Rg1-g4 in the (reverse) Hedgehog !  
  > **username_2**: Your comments seem strange to me (2000 ELO). The knight might be slightly better on c5 then d5 (I'm not even sure about that) but you can't possibly spend three moves getting it there. Then you talk about Black's hold on the a5 pawn weakening ... what White pieces are attacking a5? (None). The position is basically a reversed Sicilian where Black doesn't even have the development lead to compensate for a worse structure.  
  > **username_0**: @username_2 it's a semi-closed position. Three moves is fine. And a7-a5 was played to prevent b4.  
  > **username_0**: @username_1 that would bias the question. As you can see, everyone (such as deduplicator and others) are taking this position and the moves for granted. It's better to use NN-NN.  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_1 on 2017-11-29. Score: 5 | Accepted answer
  
  The game you refer to is [Bobby-Fischer - Ulf Andersson, Siegen 1970](http://www.chessgames.com/perl/chessgame?gid=1019452).
  
  It is famous for Fischer introducing the impressive plan Kh1,Rg1,g4,Rg3,Rag1 that has often been used since in hedgehog position, mainly for Black.
  
  > *White chose to activate his Knight with Ne4. Of course, he will have to play g4 to prevent …f5*
  
  Actually ...f5 is pretty hard for Black to engineer in that kind of position: he has to prevent Neg5 and Nc5, to provide support for his Pe5, and he won't be threatening ...e4 nor ...f4 any time soon. Note that the Re8-Bf8 dispositif is better suited for queenside play while keeping a solid f6-e5 center, the plans would be different in a position with Bb6 and Rf8 for instance.
  
  Fischer's g2-g4 is actually is much deeper plan than just securing the Ne4: it more generally grab space on the kingside (e4 but also f5 for a Knight, g3 for a rook) and threaten g4-g5 at a suitable moment to open the long diagonal for the Bb2 and the g-file for the rooks.
  
  > *Black can play Nb6-d7-c5, attacking b3 and -- more importantly -- d3. This also places the knight on a better square, as it was doing nothing on d5.*
  
  This is reasonnable enough, but White can hold on b3 and d3 without too much trouble. In later years, Qb1-Bd1-Bc2 would even become fashionable, even if it probably wasn't in Fischer's mind back in 1970. This regrouping secures both pawns and adds pressure on the diagonals toward the kingside when the game opens up, most often with d3-d4.
  
  Moreover, after White's Ne4, it is not sure that Black Knight will reach c5 at all. Supposing it does, it would still be sensitive to tempo-gaining freeing move like b3-b4 and d3-d4.
  
  Finally, I beg to differ about the Nd5. Although it is screening the pressure on the d-file, it is not "doing nothing": control of b4, e3 and f4 stops White from trying the most agressive plans with b3-b4 or f2-f4. Generally speaking, central squares that your opponent's pawns can't control are considered good spots for your knights.
  
  > *An alternative is also Nb6-d7 and f5-f4.*
  
  This however is a very bad plan. Even if Black was granted four free moves to achieve it without White moving at all, it would result in passive pieces (Nc6,Nd7,Re8) holding to the backward pawn on e5 that will be firmly blocked (Ne4) and under fire (Bb2, Nf3, possibly Qa1 or Nc4).
  
  And what do you try to gain with f5-f4 ? An attack on Pe3 ? For that purpose you wouldn't want to retreat your Nd5 to d7. Opening the f-file or the a7-g1 diagonal ? Well, you have Re8-Bf8, not Rf8-Bb6. I see no reason for White to be afraid of f5-f4.
  
  
  ---
  
  ### Answer by username_3 on 2017-11-29. Score: 0
  
  This is not NN-NN, but Fischer-Andersson from 1970.
  Fischer played Kg1 here.
  The position is complex, but white definitely has the afdvantage due to his better/more compact pawn structure, although the pawns are unadvanced.
  I guess Fischer chose the best plan, however, in general, the Nimzovich-Larsen Attack, starting with 1.b3, is a bit dubious.
  In above game, Andersson played 3...Nf6, which is inaccurate, black should have continued with 3...g6 and then Bg7 instead, to neutralise the b2 bishop.
  After played Nf6 and Be7, the white bishop on b2 already targets the knight on f6 and the g7 shelter square. In case the black bishop had been developed on g7, all those threats would not have existed.
  Another very salient feature of above-posted position is that white has 2 central pawns, on e and d files, while black only 1, on the e file. Central pawns are very valuable, so the d3 white pawn is very strong, although unadvanced.
  Andersson later made a positional blunder with d7-d5, and Fischer captured cd5, but that was theory at that time and maybe still is. Top GMs made an awful lot of positional mistakes at those times...
  
  > **Comments:**
  > **username_1**: 9...d7-d5(!) is no more a *positional blunder* for Black in this game than 3.d2-d4 for White in the main line Sicilian.  
  > **username_3**: Yes, it is. Pawn structures are quite different. There is a reason why Andersson lost, and it starts in the very opening. And yes, that is why the Sicilian is a good opening for black and scores excellently(51-49), precisely because a less important semi-central c pawn is traded for a more central d file pawn. In the Fischer game, another factor was white's first move advantage.  
  
  ---
  
  ### Answer by username_4 on 2017-11-28. Score: 0
  
  White can play d4! And in the line you gave with Ne4, the idea of preparing g4 is not the only plan. The knight can head to c5 himself.
  
  > **Comments:**
  > **username_0**: Black would trade his bad, inactive dark-squared bishop for the active c5 knight. D4 would only help black use his dark squared bishop after ...Bd6.  
  > **username_4**: That is thematic for White in these English type positions.  
  > **username_0**: It's thematic for Black to activate his pieces?  
  > **username_4**: It is thematic for White to control c5.  There are countless games where White puts a knight or bishop on c5 which can be traded off by Blacks bishop.  
  
  ---
  
  