Answers.Body: <p>Attempting to answer the revised puzzle:</p>
  
  <blockquote class="spoiler">
    <p> 1.Nxe4 Qd5 2.Qg3 with the threat of 3 Ne6 winning due to double threat (4 Qxg7 and discovered attack from the Rd3).  White still carries out this threat if Black answers 2.Qg3 with either Qxe4 or Rxe4.  Presumably this is strong enough that the engines didn't even let Black answer 1.Nxe4 with Qd5.  Note that this tactic also depends on Qg3's access to d3 (after Qxe4 3 Ne6 Qxe6 4 fxe6 Rxd3) and the 8th rank (for Qxe4 3 Ne6 Rxe6 4 Rxd8+ Re8 5 Qb8!).</p>
  </blockquote>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-11-29T03:58:43.173Z
Answers.LastActivityDate: 2015-11-29T22:52:44.570Z
Answers.LastEditDate: 2015-11-29T22:52:44.570Z
Answers.UserDisplayName: Noam D. Elkies
Body: <p>Here it is a new chess problem much more difficult than the previous one. The diagram position is the following:</p>
  
  <pre><code>[fen "3rr2k/6pp/p2q1p2/5P2/3Nb3/1P1RQ1NP/6P1/7K w - - 0 1"]
  </code></pre>
  
  <p>Black has just played Bxe4 but that is not a good choice. <strong>How should White continue in this position?</strong></p>
  
  <p>I took this problem from the <a href="http://chess.emrald.net/index.php" rel="nofollow">Chess Tactics Server.</a> I hope this takes more time to be solved than the previous one.</p>
  
  <p>EDIT: </p>
  
  <blockquote class="spoiler">
    <p>After Nxe4 Black plays Qd4 instead of Qe4, giving White the choice of playing a powerful movement.</p>
  </blockquote>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-11-21T15:09:19.420Z
Comments.Text: Hehe Chess Tactics Server is brutal.
Comments.UserDisplayName: Tony Ennis
Tags: <tactics><problems>
Title: Chess challenge #3: Pinned knights
ThreadText: # Chess challenge #3: Pinned knights
  
  (Asked by: username_0 on 2015-11-21)
  
  Here it is a new chess problem much more difficult than the previous one. The diagram position is the following:
  [fen "3rr2k/6pp/p2q1p2/5P2/3Nb3/1P1RQ1NP/6P1/7K w - - 0 1"]
  
  Black has just played Bxe4 but that is not a good choice. How should White continue in this position?
  I took this problem from the Chess Tactics Server. I hope this takes more time to be solved than the previous one.
  EDIT: 
  
  After Nxe4 Black plays Qd4 instead of Qe4, giving White the choice of playing a powerful movement.
  
  **Tags:** tactics, problems
  
  > **Comments:**
  > **username_1**: Hehe Chess Tactics Server is brutal.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2015-11-29. Score: 4 | Accepted answer
  
  Attempting to answer the revised puzzle:
  
  > 1.Nxe4 Qd5 2.Qg3 with the threat of 3 Ne6 winning due to double threat (4 Qxg7 and discovered attack from the Rd3). White still carries out this threat if Black answers 2.Qg3 with either Qxe4 or Rxe4. Presumably this is strong enough that the engines didn't even let Black answer 1.Nxe4 with Qd5. Note that this tactic also depends on Qg3's access to d3 (after Qxe4 3 Ne6 Qxe6 4 fxe6 Rxd3) and the 8th rank (for Qxe4 3 Ne6 Rxe6 4 Rxd8+ Re8 5 Qb8!).
  
  
  ---
  
  