Answers.Body: <p>Black has no win.  White scoops up the <code>b6</code> pawn and enjoys the advantage.</p>
  
  <pre><code>[Title "White to move"]
  [fen "4r1k1/3q1ppp/pp6/2QN1n2/1P6/8/P4PPP/3R2K1 w - - 0 1"] 
  
  
       1.Qc1 Qa4 2.a3 Ne7 3.Nxb6 Qb5 4.Nc4 Nf5 5.g3 h6 6.Nd6 Nxd6 7.Rxd6 a5 8.bxa5 Qxa5 9.Qc6 Qa8 10.a4 Kf8 11.Kg2 Qxc6+ 12.Rxc6 Ra8 13.Rc4 Ke7 14.Kf3 Kd6 15.Rd4+ Kc6 16.h4 g6 17.Rf4 Ra7 18.Ke3 Kd5 19.Kd3 Ke5 20.Rb4
  </code></pre>
  
  <p>So says Stockfish 5.  Everything past move 5 or so is probably suspect but you get the idea.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-06-05T04:16:47.887Z
Answers.LastActivityDate: 2014-06-05T04:16:47.887Z
Answers.UserDisplayName: Tony Ennis
Answers.Body: <p>My suspicion is that the computer is calculating at a depth of 3-ply. At 3-ply depth, it sees that the following variations are winning - </p>
  
  <p><code>1. Nf6+ gxf6 2. Rxd7</code> and </p>
  
  <p><code>1. Qxb6 Qxd5 2. Rxd5</code></p>
  
  <p>winning material. </p>
  
  <p>If it was at 4-ply or more, it would have seen <code>2...Re1#</code> in both lines and rejected those lines. </p>
  
  <p>To answer your question, no, Black doesn't have a win in this position. White can play <code>1. Qc1</code> and white is fine. </p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2014-06-04T17:55:46.713Z
Answers.LastActivityDate: 2014-06-04T17:55:46.713Z
Answers.UserDisplayName: NM Wesley Falcao
Body: <p>I was playing a game as Black against computer and came up a tactical move that defends me from pressure. I have expected a normal retreat of the queen yet computer kept sacrificing the knight like it was lost anyway, therefore this question :</p>
  
  <p>Did I miss a win for Black or the position is just fine for White?</p>
  
  <p>Here is the position:</p>
  
  <pre><code>[Title "White to move"]
  [fen "4r1k1/3q1ppp/pp6/2QN1n2/1P6/8/P4PPP/3R2K1 w - - 0 1"] 
  </code></pre>
  
  <p><em>White kept playing <code>Nf6+</code> or <code>Qxb6</code> but I believe that any retreat of the queen is fine, what did I miss?</em></p>
  
Tags: <analysis>
Title: Does Black have a win in this position?
ThreadText: # Does Black have a win in this position?
  
  (Asked by: username_0 on 2014-06-04)
  
  I was playing a game as Black against computer and came up a tactical move that defends me from pressure. I have expected a normal retreat of the queen yet computer kept sacrificing the knight like it was lost anyway, therefore this question :
  Did I miss a win for Black or the position is just fine for White?
  Here is the position:
  [Title "White to move"]
  [fen "4r1k1/3q1ppp/pp6/2QN1n2/1P6/8/P4PPP/3R2K1 w - - 0 1"] 
  
  White kept playing Nf6+ or Qxb6 but I believe that any retreat of the queen is fine, what did I miss?
  
  **Tags:** analysis
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_2 on 2014-06-04. Score: 4 | Accepted answer
  
  My suspicion is that the computer is calculating at a depth of 3-ply. At 3-ply depth, it sees that the following variations are winning -
  
  `1. Nf6+ gxf6 2. Rxd7` and
  
  `1. Qxb6 Qxd5 2. Rxd5`
  
  winning material.
  
  If it was at 4-ply or more, it would have seen `2...Re1#` in both lines and rejected those lines.
  
  To answer your question, no, Black doesn't have a win in this position. White can play `1. Qc1` and white is fine.
  
  
  ---
  
  ### Answer by username_1 on 2014-06-05. Score: 1
  
  Black has no win.  White scoops up the b6 pawn and enjoys the advantage.
  [Title "White to move"]
  [fen "4r1k1/3q1ppp/pp6/2QN1n2/1P6/8/P4PPP/3R2K1 w - - 0 1"] 
  
  
       1.Qc1 Qa4 2.a3 Ne7 3.Nxb6 Qb5 4.Nc4 Nf5 5.g3 h6 6.Nd6 Nxd6 7.Rxd6 a5 8.bxa5 Qxa5 9.Qc6 Qa8 10.a4 Kf8 11.Kg2 Qxc6+ 12.Rxc6 Ra8 13.Rc4 Ke7 14.Kf3 Kd6 15.Rd4+ Kc6 16.h4 g6 17.Rf4 Ra7 18.Ke3 Kd5 19.Kd3 Ke5 20.Rb4
  
  So says Stockfish 5.  Everything past move 5 or so is probably suspect but you get the idea.
  
  
  ---
  
  