Answers.Body: <p>As <a href="https://chess.stackexchange.com/a/37520/26335">pointed out</a> by <a href="https://chess.stackexchange.com/users/17425/michael-west">Michael West</a>, <strong>1...Nf2</strong> provides White the opportunity to exploit White's overwhelming advantage whereas <strong>1...Ng3</strong> is a forced checkmate in three (i.e., Black has a guaranteed win).</p>
  <p>Black is down too much material and has no compensation if they cannot force mate. After <strong>1...Nf2??</strong>, Black is utterly lost.</p>
  <p>Stockfish 14+ NNUE confirms this (+9.8, depth = 27, 8115k nodes/s). Despite the low depth, the example lines provided illustrate the point.</p>
  <pre><code>[FEN &quot;8/2Q2pk1/3p2p1/NP1Np3/4n2p/7P/6PK/r7 b - - 0 1&quot;]
  
  1...Ng3! 2. Qxf7+ Kxf7 3. b6 Rh1# {Black wins} (1...Nf2?? 2. g4 hxg3+ 3. Kxg3 Ne4+ 4. Kf3 Ng5+ 5. Ke2 Ne6 6. Qxd6 Kh7 7. Nc4 e4 8. Qe5 Ra4 9. Nf6+ Kh6(2. g3 Ne4 3. gxh4 Ra2+ 4. Kg1 Ra1+ 5. Kg2 Ra2+ 6. Kf3 Nd2+ 7. Ke3 Nf1+ 8. Ke4 Ng3+ 9. Kd3 e4+)) 
  </code></pre>
  <p><sub>Note: Diagram from Black's point of view to match OP's diagram.</sub></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-03T15:03:16.703Z
Answers.Text: @YiFan Agreed. I wrote the answer quickly.  I've updated the answer to reflect your comment.  Do you agree with my language now?
Answers.UserDisplayName: SecretAgentMan
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-03T15:41:52.910Z
Answers.Text: @YiFan Edited. I hope I've done justice to your comments.
Answers.UserDisplayName: SecretAgentMan
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-03T15:42:44.043Z
Answers.Text: @YiFan *Sure, it's better now I guess.*   How can it be improved?
Answers.UserDisplayName: SecretAgentMan
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-03T23:08:24.990Z
Answers.Text: "(e.g., Black has a guaranteed win" *i.e.
Answers.UserDisplayName: Acccumulation
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-02T17:53:10.317Z
Answers.LastActivityDate: 2021-12-04T14:46:17.607Z
Answers.LastEditDate: 2021-12-04T14:46:17.607Z
Answers.UserDisplayName: SecretAgentMan
Answers.Body: <p>For future puzzles provided by chess.com specifically, the puzzle controls also offer engine analysis, which can be very helpful for figuring out why you move is incorrect. You can see the computer refute your move by trying it out in the analysis. I've highlighted the button in a yellow box:</p>
  <p><a href="https://i.sstatic.net/Ifwdv.png" rel="noreferrer"><img src="https://i.sstatic.net/Ifwdv.png" alt="Engine analysis tool" /></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-03T16:55:53.190Z
Answers.LastActivityDate: 2021-12-03T16:55:53.190Z
Answers.UserDisplayName: ryanyuyu
Answers.Body: <p>g3 is a better square for the Knight because it blocks White's g-pawn and so prevents White playing g3 or g4.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-03T14:02:22.867Z
Answers.Text: The knight additionally has protection at g3 from the h4 pawn but is undefended at f2.  That's not a reason to make the move alone, but it does make it a generally stronger position.
Answers.UserDisplayName: J...
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-12-02T13:48:28.040Z
Answers.LastActivityDate: 2021-12-02T13:48:28.040Z
Answers.UserDisplayName: Michael West
Body: <p>I just failed a puzzle at chess.com, despite being 2 moves away from check mate. I am quite sure that there is no move I could have made to get check mate in 1 move, so I am wondering how I failed.</p>
  <p>I just looked at the suggested solution, which would be moving to g3 instead, why is that better than my move?</p>
  <p><a href="https://i.sstatic.net/xC0Uu.png" rel="noreferrer"><img src="https://i.sstatic.net/xC0Uu.png" alt="Move classified as incorrect" /></a></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-12-05T20:08:50.240Z
Comments.Text: why don't you just check on [lichess](https://lichess.org/analysis/8/2Q2pk1/3p2p1/NP1Np3/4n2p/7P/6PK/r7_b_-_-_0_1)? you can even use [chessvision](https://chrome.google.com/webstore/detail/chessvisionai-chess-posit/johejpedmdkeiffkdaodgoipdjodhlld) to get the FEN
Comments.UserDisplayName: BCLC
Tags: <puzzles>
Title: Why did I fail this puzzle?
ThreadText: # Why did I fail this puzzle?
  
  (Asked by: username_0 on 2021-12-02)
  
  I just failed a puzzle at chess.com, despite being 2 moves away from check mate. I am quite sure that there is no move I could have made to get check mate in 1 move, so I am wondering how I failed.
  
  I just looked at the suggested solution, which would be moving to g3 instead, why is that better than my move?
  
  [![Move classified as incorrect](https://i.sstatic.net/xC0Uu.png)](https://i.sstatic.net/xC0Uu.png)
  
  **Tags:** puzzles
  
  > **Comments:**
  > **username_1**: why don't you just check on [lichess](https://lichess.org/analysis/8/2Q2pk1/3p2p1/NP1Np3/4n2p/7P/6PK/r7_b_-_-_0_1)? you can even use [chessvision](https://chrome.google.com/webstore/detail/chessvisionai-chess-posit/johejpedmdkeiffkdaodgoipdjodhlld) to get the FEN  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_5 on 2021-12-02. Score: 33 | Accepted answer
  
  g3 is a better square for the Knight because it blocks White's g-pawn and so prevents White playing g3 or g4.
  
  > **Comments:**
  > **username_6**: The knight additionally has protection at g3 from the h4 pawn but is undefended at f2.  That's not a reason to make the move alone, but it does make it a generally stronger position.  
  
  ---
  
  ### Answer by username_2 on 2021-12-02. Score: 20
  
  As [pointed out](https://chess.stackexchange.com/a/37520/26335) by [username_5 username_5](https://chess.stackexchange.com/users/17425/username_5-username_5), **1...Nf2** provides White the opportunity to exploit White's overwhelming advantage whereas **1...Ng3** is a forced checkmate in three (i.e., Black has a guaranteed win).
  
  Black is down too much material and has no compensation if they cannot force mate. After **1...Nf2??**, Black is utterly lost.
  
  Stockfish 14+ NNUE confirms this (+9.8, depth = 27, 8115k nodes/s). Despite the low depth, the example lines provided illustrate the point.
  
  ```
  [FEN "8/2Q2pk1/3p2p1/NP1Np3/4n2p/7P/6PK/r7 b - - 0 1"]
  
  1...Ng3! 2. Qxf7+ Kxf7 3. b6 Rh1# {Black wins} (1...Nf2?? 2. g4 hxg3+ 3. Kxg3 Ne4+ 4. Kf3 Ng5+ 5. Ke2 Ne6 6. Qxd6 Kh7 7. Nc4 e4 8. Qe5 Ra4 9. Nf6+ Kh6(2. g3 Ne4 3. gxh4 Ra2+ 4. Kg1 Ra1+ 5. Kg2 Ra2+ 6. Kf3 Nd2+ 7. Ke3 Nf1+ 8. Ke4 Ng3+ 9. Kd3 e4+)) 
  
  ```
  
  Note: Diagram from Black's point of view to match OP's diagram.
  
  > **Comments:**
  > **username_2**: @YiFan Agreed. I wrote the answer quickly.  I've updated the answer to reflect your comment.  Do you agree with my language now?  
  > **username_2**: @YiFan Edited. I hope I've done justice to your comments.  
  > **username_2**: @YiFan *Sure, it's better now I guess.*   How can it be improved?  
  > **username_3**: "(e.g., Black has a guaranteed win" *i.e.  
  
  ---
  
  ### Answer by username_4 on 2021-12-03. Score: 9
  
  For future puzzles provided by chess.com specifically, the puzzle controls also offer engine analysis, which can be very helpful for figuring out why you move is incorrect. You can see the computer refute your move by trying it out in the analysis. I've highlighted the button in a yellow box:
  
  [![Engine analysis tool](https://i.sstatic.net/Ifwdv.png)](https://i.sstatic.net/Ifwdv.png)
  
  
  ---
  
  