Answers.Body: <p>After 1.Nf3 the most popular answer is 1…Nf6, which is a hundred times more common than 1…b5. 1…d5 is the second most popular choice, still fifty times more likely to appear on the board than 1…b5.</p>
  
  <p>Now the difference between 1…Nf6 and 1…d5 is mostly one of compatibility with the rest of your opening repertoire. 1…Nf6 is more common because the indian defences are more popular than the 1…d5 against 1.d4.</p>
  
  <p>But 1…b5 is decidedly <strong>offbeat</strong>. The reason is that it doesn't immediately fight for control of the central squares. The importance of the central squares is explained in the answers to this question: 
  <a href="https://chess.stackexchange.com/questions/5142/why-is-the-centre-of-the-board-considered-important-in-chess">Why is the centre of the board considered important in chess?</a></p>
  
  <p>Still, 1…b5 isn't a mistake. It has the ideas of developing the bishop to b7, making c4 impossible and maybe annoy a Nc3 in the future. If black can consolidate, the additional space on the queenside might make a difference.</p>
  
  <p>The main problem from a theoretical standpoint is probably that it is rather slow: 1.Nf3 b5 2.e4 Bb7 3.Bxb5 Bxe4 4.Nc3 Bb7 5.O-O and white has quite a significant development lead.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-04-02T09:08:41.527Z
Answers.LastActivityDate: 2015-04-02T09:08:41.527Z
Answers.LastEditDate: 2017-04-13T12:48:53.737Z
Answers.UserDisplayName: BlindKungFuMaster
Answers.Body: <p>This is hopefully the answer you're looking for, Nf3 is part of 2 Openings (as far as I know).</p>
  
  <p>First is the "Zukertort Opening" 1.Nf3 d5 (so d5 is the response) however there is also a c5 response for black attempting to make it a Sicilian (I do not know much about this opening except for this you'll have to do some research on it)</p>
  
  <p>Now there is the more famous Reti Opening, where it's actually 1.Nf3 d5 (just like the last one) and now 2.c4... You'll most likely find a lot more information on this opening than the Zukertort.</p>
  
  <p>So the overall conclusion 1. Nf3 d5 is the answer for your question, however as you can see there is the c5 answer as well. So it depends on your play style afterwards. You might want to play the c5 from the Zukort to transcend into the Sicilian (which might be up your alley depending on how you play as black)</p>
  
  <p>Hope I helped. If you have any further questions feel free to comment and I will answer to the best of my abilities.</p>
  
  <p>Also just to make sure, those are the only 2 openings I know of that start with Nf3 there might be others :) I will research around and see if I can find any with other answers then post a comment on this post :)</p>
  
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Answers.CreationDate: 2015-04-02T09:50:05.407Z
Answers.LastActivityDate: 2015-04-02T09:50:05.407Z
Answers.UserDisplayName: Chessbrain
Answers.Body: <p>Objectively 1...d5 is better because it grabs control of the center. </p>
  
  <p>Practically, most people will respond to 1. Nf3 with an opening they have worked out and are familiar with even if it is not objectively best. </p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-22T09:52:45.753Z
Answers.Text: "Objectively 1...d5 is better because it grabs control of the center". Strongly disagree. 1...b5 does much more for the center since it "protects" the d-pawn a later attack by a c4-push by White
Answers.UserDisplayName: David
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-24T01:38:24.330Z
Answers.Text: @David- You're just flat out wrong. After 1.Nf3, b5 2. e4 there is no immediate way black can equalize, c4 push or not. I realize this might not be as immediately obvious to lower level players but I'll point out that all engines, databases and books would agree with me.
Answers.UserDisplayName: Savage47
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-24T06:22:44.560Z
Answers.Text: **2... Bb7*** is OK for Black. The most ambitious move for White is precisely **3. Bxb5*** which, oddly enough, trades White's central pawn for Black's lateral one. So, if there is any reason to prefer **1...d5**, it's not about central control with pawns
Answers.UserDisplayName: David
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Answers.CreationDate: 2019-10-24T07:01:58.410Z
Answers.Text: @david- 1.Nf3, b5 2. e4, Bb7 3. d4, Bxe4 White is still better. White has control of the center and black is going to have to spend a couple of tempi moving his bishop back and figuring out what to do white's bishop pinning his d-pawn.
Answers.UserDisplayName: Savage47
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-24T07:53:33.910Z
Answers.Text: Why does White have a better control of the center on your line? Black will eventually establish his pawn-majority. White is slightly better, but only due to development
Answers.UserDisplayName: David
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-28T02:14:40.157Z
Answers.Text: @David- White occupies d4 and controls e5. The best black can do at the moment is d5 which is only equal in the center however white's lead in development (and better pawn structure) will allow him to create other advantages either in the center or elsewhere. Yes, it's possible that black could eventually equalize in the center with his two central pawns but is there any proof that actually happens? This is the same debate that happens in the sicilian and other better openings and there isn't definitive proof there either. If there was you would see GMs playing this all the time.
Answers.UserDisplayName: Savage47
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-28T09:29:49.703Z
Answers.Text: In the Sicilian, Black has a hard time breaking White's center with **...f5***. In the position we are taling about, Black can play the "equivalent" **...c5** almost anytime he wants. The positions are different,
Answers.UserDisplayName: David
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Answers.CreationDate: 2019-10-29T00:23:01.263Z
Answers.Text: @David- you really aren't understanding or even trying to understand what I'm saying. I brought up the sicilian as an example of when black has e and d pawns vs an advanced e-pawn. You went off on a tangent talking about f-pawns which isn't even a normal break in the sicilian.
Answers.UserDisplayName: Savage47
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-29T07:19:24.503Z
Answers.Text: That's exactly the point. In the Open Sicilian, Black has no chance to play **...f5** minimg the White e4 pawn. In the position we are discussing, Black can play **...c5** any time he wants. That's why the positions are not comparable. I wonder if you actually read what I say...
Answers.UserDisplayName: David
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-30T01:23:00.997Z
Answers.Text: @david- I read what you said but it doesn't make sense. I'm guessing you mean "winning" instead of "minimg" but regardless there's no way for black to win the e-pawn. Yes he is putting pressure on it and yes he could capture it at some point but doing that will involve creating other weaknesses. White is better no matter what black plays and tbh black could very easily fall into a lost game with one mistake.
Answers.UserDisplayName: Savage47
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-10-30T07:24:41.687Z
Answers.Text: White is better, but not because of center control
Answers.UserDisplayName: David
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Answers.CreationDate: 2019-10-22T03:09:03.210Z
Answers.LastActivityDate: 2019-10-22T03:09:03.210Z
Answers.UserDisplayName: Savage47
Body: <p>After <code>1.Nf3</code> I can gain space with either of <code>1...d5</code> or <code>1...b5</code>. Which of these two is better?</p>
  
  <p>I presume it's <code>1...d5</code>, but I just want to make sure.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-31T18:45:21.640Z
Comments.Text: What is a KB3 opening? Do you mean an opening where White plays Nf3? And what do you mean by rushing an opening?
Comments.UserDisplayName: Stephen
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-31T21:36:34.673Z
Comments.Text: Yes, nf3 -- Followup question; Why N for Knight, instead of K?
Comments.UserDisplayName: Anon
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-31T21:43:14.980Z
Comments.Text: Because K = king. OK, so I think you are asking how to reply to 1.Nf3. Good replies include d5, Nf6 and c5. But what do you mean by "rush"?
Comments.UserDisplayName: Stephen
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-03-31T21:58:23.120Z
Comments.Text: Just when a pawn jumps two squares the first turn, and moves the second turn as well.
Comments.UserDisplayName: Anon
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-04-02T15:54:53.573Z
Comments.Text: there is also f5, if you are interested in playing away from your opponent's knowledge.
Comments.UserDisplayName: CognisMantis
Tags: <opening>
Title: Is it better to reply to 1.Nf3 with ...d5 or ...b5?
ThreadText: # Is it better to reply to 1.Nf3 with ...d5 or ...b5?
  
  (Asked by: username_0 on 2015-03-31)
  
  After `1.Nf3` I can gain space with either of `1...d5` or `1...b5`. Which of these two is better?
  
  I presume it's `1...d5`, but I just want to make sure.
  
  **Tags:** opening
  
  > **Comments:**
  > **username_1**: What is a KB3 opening? Do you mean an opening where White plays Nf3? And what do you mean by rushing an opening?  
  > **username_0**: Yes, nf3 -- Followup question; Why N for Knight, instead of K?  
  > **username_1**: Because K = king. OK, so I think you are asking how to reply to 1.Nf3. Good replies include d5, Nf6 and c5. But what do you mean by "rush"?  
  > **username_0**: Just when a pawn jumps two squares the first turn, and moves the second turn as well.  
  > **username_2**: there is also f5, if you are interested in playing away from your opponent's knowledge.  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_3 on 2015-04-02. Score: 6 | Accepted answer
  
  After 1.Nf3 the most popular answer is 1…Nf6, which is a hundred times more common than 1…b5. 1…d5 is the second most popular choice, still fifty times more likely to appear on the board than 1…b5.
  
  Now the difference between 1…Nf6 and 1…d5 is mostly one of compatibility with the rest of your opening repertoire. 1…Nf6 is more common because the indian defences are more popular than the 1…d5 against 1.d4.
  
  But 1…b5 is decidedly **offbeat**. The reason is that it doesn't immediately fight for control of the central squares. The importance of the central squares is explained in the answers to this question:
  [Why is the centre of the board considered important in chess?](https://chess.stackexchange.com/questions/5142/why-is-the-centre-of-the-board-considered-important-in-chess)
  
  Still, 1…b5 isn't a mistake. It has the ideas of developing the bishop to b7, making c4 impossible and maybe annoy a Nc3 in the future. If black can consolidate, the additional space on the queenside might make a difference.
  
  The main problem from a theoretical standpoint is probably that it is rather slow: 1.Nf3 b5 2.e4 Bb7 3.Bxb5 Bxe4 4.Nc3 Bb7 5.O-O and white has quite a significant development lead.
  
  
  ---
  
  ### Answer by username_4 on 2015-04-02. Score: 3
  
  This is hopefully the answer you're looking for, Nf3 is part of 2 Openings (as far as I know).
  
  First is the "Zukertort Opening" 1.Nf3 d5 (so d5 is the response) however there is also a c5 response for black attempting to make it a Sicilian (I do not know much about this opening except for this you'll have to do some research on it)
  
  Now there is the more famous Reti Opening, where it's actually 1.Nf3 d5 (just like the last one) and now 2.c4... You'll most likely find a lot more information on this opening than the Zukertort.
  
  So the overall conclusion 1. Nf3 d5 is the answer for your question, however as you can see there is the c5 answer as well. So it depends on your play style afterwards. You might want to play the c5 from the Zukort to transcend into the Sicilian (which might be up your alley depending on how you play as black)
  
  Hope I helped. If you have any further questions feel free to comment and I will answer to the best of my abilities.
  
  Also just to make sure, those are the only 2 openings I know of that start with Nf3 there might be others :) I will research around and see if I can find any with other answers then post a comment on this post :)
  
  
  ---
  
  ### Answer by username_5 on 2019-10-22. Score: 2
  
  Objectively 1...d5 is better because it grabs control of the center.
  
  Practically, most people will respond to 1. Nf3 with an opening they have worked out and are familiar with even if it is not objectively best.
  
  > **Comments:**
  > **username_6**: "Objectively 1...d5 is better because it grabs control of the center". Strongly disagree. 1...b5 does much more for the center since it "protects" the d-pawn a later attack by a c4-push by White  
  > **username_5**: @username_6- You're just flat out wrong. After 1.Nf3, b5 2. e4 there is no immediate way black can equalize, c4 push or not. I realize this might not be as immediately obvious to lower level players but I'll point out that all engines, databases and books would agree with me.  
  > **username_6**: **2... Bb7*** is OK for Black. The most ambitious move for White is precisely **3. Bxb5*** which, oddly enough, trades White's central pawn for Black's lateral one. So, if there is any reason to prefer **1...d5**, it's not about central control with pawns  
  > **username_5**: @username_6- 1.Nf3, b5 2. e4, Bb7 3. d4, Bxe4 White is still better. White has control of the center and black is going to have to spend a couple of tempi moving his bishop back and figuring out what to do white's bishop pinning his d-pawn.  
  > **username_6**: Why does White have a better control of the center on your line? Black will eventually establish his pawn-majority. White is slightly better, but only due to development  
  > **username_5**: @username_6- White occupies d4 and controls e5. The best black can do at the moment is d5 which is only equal in the center however white's lead in development (and better pawn structure) will allow him to create other advantages either in the center or elsewhere. Yes, it's possible that black could eventually equalize in the center with his two central pawns but is there any proof that actually happens? This is the same debate that happens in the sicilian and other better openings and there isn't definitive proof there either. If there was you would see GMs playing this all the time.  
  > **username_6**: In the Sicilian, Black has a hard time breaking White's center with **...f5***. In the position we are taling about, Black can play the "equivalent" **...c5** almost anytime he wants. The positions are different,  
  > **username_5**: @username_6- you really aren't understanding or even trying to understand what I'm saying. I brought up the sicilian as an example of when black has e and d pawns vs an advanced e-pawn. You went off on a tangent talking about f-pawns which isn't even a normal break in the sicilian.  
  > **username_6**: That's exactly the point. In the Open Sicilian, Black has no chance to play **...f5** minimg the White e4 pawn. In the position we are discussing, Black can play **...c5** any time he wants. That's why the positions are not comparable. I wonder if you actually read what I say...  
  > **username_5**: @username_6- I read what you said but it doesn't make sense. I'm guessing you mean "winning" instead of "minimg" but regardless there's no way for black to win the e-pawn. Yes he is putting pressure on it and yes he could capture it at some point but doing that will involve creating other weaknesses. White is better no matter what black plays and tbh black could very easily fall into a lost game with one mistake.  
  > **username_6**: White is better, but not because of center control  
  
  ---
  
  