Answers.Body: <p>I daresay we talk about 1...Nxb4 2.axb4 Bxb5. OK, maybe not -3 but...</p>
  <ul>
  <li>White can't castle for some time</li>
  <li>Solid extra pawn (3.Qxc7 Nd5 will end in a desaster)</li>
  <li>Don't object to having the a-file</li>
  <li>Bishop pair (not relevant yet)</li>
  <li>White's Bb2 is bad, and since probably ...d5 soon comes, that won't change</li>
  <li>Finally, want to play something else? c6 hangs and c7 indirectly.</li>
  </ul>
  <p>Against myself I'd resign on the spot.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-06-24T08:30:56.677Z
Answers.Text: I don't see why you would resign, as many losing positions have been able to be turned around just from an opponent blunder or further poor play!
Answers.UserDisplayName: qwr
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Answers.CreationDate: 2021-06-24T08:50:52.717Z
Answers.Text: resigning in a classical game is indeed tempting
Answers.UserDisplayName: sleepy
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Answers.CreationDate: 2021-06-24T10:16:11.127Z
Answers.Text: +1, even though I am certain that you wouldn't resign as White in that position in an actual game. It may be diheartening to defend that, but let the opponent demonstrate how he is going to break through.
Answers.UserDisplayName: Evargalo
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Answers.CreationDate: 2021-06-24T18:00:29.960Z
Answers.Text: @qwr,Evargalo, Hauke said that he would resign against himself. You may be correct that he would not resign against either of you.
Answers.UserDisplayName: Philip Roe
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Answers.CreationDate: 2021-06-25T08:09:08.783Z
Answers.Text: @Universal_learner: Now that you say it... (Typical error: I automatically assume any tactics problem to be balanced materially (or at least chaotic, if you shall find a wondrous mate) and don't count. M'kay, in that case I play on :-)  with 3.e4 (to avoid at least Nd5) but with not much hope after 3...d5 4.e5 Ne4.
Answers.UserDisplayName: Hauke Reddmann
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Answers.CreationDate: 2021-06-24T07:41:43.157Z
Answers.LastActivityDate: 2021-06-24T07:41:43.157Z
Answers.UserDisplayName: Hauke Reddmann
Answers.Body: <p>horrible weakness of the light squares is what has not been listed in the answers yet. I'd probably not evaluate it at -3 though (I don't do it in numbers anyway), but it's pretty hopeless for white.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-06-24T08:53:06.280Z
Answers.LastActivityDate: 2021-06-24T08:53:06.280Z
Answers.UserDisplayName: sleepy
Body: <pre><code>[Event &quot;Rated Rapid game&quot;]
  [Site &quot;https://lichess.org/tZI4OlZ3&quot;]
  [Date &quot;2021.04.20&quot;]
  [White &quot;Paulinos&quot;]
  [Black &quot;Qedesh76&quot;]
  [FEN &quot;r3qrk1/2pbbppp/2nppn2/1B6/1P1P4/P3PN2/1BQN1PPP/2R1K2R b Kq - 0 1&quot;]
  [StartFlipped &quot;1&quot;]
  
  1. Nxb4 axb4 2.Bxb5
  </code></pre>
  <p><a href="https://lichess.org/training/oDPez" rel="nofollow noreferrer">Link to lichess exercise</a></p>
  <p>I guessed my way through the puzzle, figuring it would be a discovered attack. If the pawn takes back the knight then I capture the bishop for a minor piece trade. I guessed that this was advantageous since Black has an open rook file.</p>
  <p>But why does Stockfish think this position is so advantageous, with an evaluation -3.9, for Black? I followed the recommended lines a for a few moves. In certain lines where the White queen doesn't move, then the b4 pawn can be captured by the dark-squared bishop, setting up a powerful bishop pai. But other lines don't seem clearly so advantageous to me.</p>
  
Tags: <analysis><stockfish><puzzles>
Title: Why does Stockfish evaluate this Lichess puzzle position as so advantageous for Black?
ThreadText: # Why does Stockfish evaluate this Lichess puzzle position as so advantageous for Black?
  
  (Asked by: username_0 on 2021-06-24)
  
  ```
  [Event "Rated Rapid game"]
  [Site "https://lichess.org/tZI4OlZ3"]
  [Date "2021.04.20"]
  [White "Paulinos"]
  [Black "Qedesh76"]
  [FEN "r3qrk1/2pbbppp/2nppn2/1B6/1P1P4/P3PN2/1BQN1PPP/2R1K2R b Kq - 0 1"]
  [StartFlipped "1"]
  
  1. Nxb4 axb4 2.Bxb5
  
  ```
  
  [Link to lichess exercise](https://lichess.org/training/oDPez)
  
  I guessed my way through the puzzle, figuring it would be a discovered attack. If the pawn takes back the knight then I capture the bishop for a minor piece trade. I guessed that this was advantageous since Black has an open rook file.
  
  But why does Stockfish think this position is so advantageous, with an evaluation -3.9, for Black? I followed the recommended lines a for a few moves. In certain lines where the White queen doesn't move, then the b4 pawn can be captured by the dark-squared bishop, setting up a powerful bishop pai. But other lines don't seem clearly so advantageous to me.
  
  **Tags:** analysis, stockfish, puzzles
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2021-06-24. Score: 6
  
  I daresay we talk about 1...Nxb4 2.axb4 Bxb5. OK, maybe not -3 but...
  
  * White can't castle for some time
  * Solid extra pawn (3.Qxc7 Nd5 will end in a desaster)
  * Don't object to having the a-file
  * Bishop pair (not relevant yet)
  * White's Bb2 is bad, and since probably ...d5 soon comes, that won't change
  * Finally, want to play something else? c6 hangs and c7 indirectly.
  
  Against myself I'd resign on the spot.
  
  > **Comments:**
  > **username_0**: I don't see why you would resign, as many losing positions have been able to be turned around just from an opponent blunder or further poor play!  
  > **username_2**: resigning in a classical game is indeed tempting  
  > **username_3**: +1, even though I am certain that you wouldn't resign as White in that position in an actual game. It may be diheartening to defend that, but let the opponent demonstrate how he is going to break through.  
  > **username_4**: @username_0,username_3, username_1 said that he would resign against himself. You may be correct that he would not resign against either of you.  
  > **username_1**: @Universal_learner: Now that you say it... (Typical error: I automatically assume any tactics problem to be balanced materially (or at least chaotic, if you shall find a wondrous mate) and don't count. M'kay, in that case I play on :-)  with 3.e4 (to avoid at least Nd5) but with not much hope after 3...d5 4.e5 Ne4.  
  
  ---
  
  ### Answer by username_2 on 2021-06-24. Score: 1
  
  horrible weakness of the light squares is what has not been listed in the answers yet. I'd probably not evaluate it at -3 though (I don't do it in numbers anyway), but it's pretty hopeless for white.
  
  
  ---
  
  