Answers.Body: <p>Nice puzzle, this took me a few minutes. </p>
  
  <blockquote class="spoiler">
    <p>The answer is 1.Qa3#.</p>
  </blockquote>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-04-30T23:54:53.683Z
Answers.LastActivityDate: 2020-04-30T23:54:53.683Z
Answers.UserDisplayName: Inertial Ignorance
Answers.Body: <p>Moving</p>
  
  <blockquote class="spoiler">
    <p> D7 to D8 </p>
  </blockquote>
  
  <p>ending up with 3 Queens              </p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-11-20T19:45:36.647Z
Answers.Text: d7-d8Q would be invalid - the pawn is pinned against the king by the bishop on c8.
Answers.UserDisplayName: Glorfindel
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2020-11-07T13:16:01.733Z
Answers.Text: @A.A. If we overlook d8 being illegal, a queen on d8 would attack the king in addition to the rook on a7, and Bb7 would block only one of these attacks. I don’t understand your comment.
Answers.UserDisplayName: Brian Drake
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2015-11-20T19:19:22.270Z
Answers.LastActivityDate: 2020-04-30T22:48:58.317Z
Answers.LastEditDate: 2020-04-30T22:48:58.317Z
Answers.UserDisplayName: equiners
Answers.Body: <p>The only escape sqare that isn't currently covered by White is f8.<br>
  1. Ng6 is the only move which gives check, while also defending f8, without also opening up another escape square.<br>
  1. Qc5 comes close, but it allows 1… Kd8. </p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-05-25T19:36:22.890Z
Answers.Text: 1… Bxg6. Nevermind. 
Answers.UserDisplayName: Jivan Scarano
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2016-05-25T19:34:28.707Z
Answers.LastActivityDate: 2016-05-25T19:34:28.707Z
Answers.UserDisplayName: Jivan Scarano
Answers.Body: <p>It seems that</p>
  
  <blockquote class="spoiler">
    <p> Qa3</p>
  </blockquote>
  
  <p>is mate in one. It is indeed harder than it looks at first sight, because there are so many pins.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-11-19T11:15:06.030Z
Answers.LastActivityDate: 2015-11-19T11:15:06.030Z
Answers.UserDisplayName: Glorfindel
Body: <p>This is the first of a series of challenges I'll be posting regularly. In this case it is just a <em>simple</em> mate in one. This is the position:</p>
  <pre><code> [Title &quot;White to mate in one&quot;]
   [FEN &quot;1Bb3BN/R2Pk1pr/1Q5B/4q2R/2bN/4Q1BK/1p/1bq1R1rb w - - 0 1&quot;]
  </code></pre>
  <p>White plays and gives mate. It seems very easy but there are a lot of pieces in the board. I'll be increasing or reducing the level of the challenges based on the answers.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-11-19T11:52:59.153Z
Comments.Text: @Bad_Bishop Thanks, I was thinking about something similar. I don't know any "official" source for this one, a member of my chess club showed it to me a few weeks ago, but I don't know where she found it. I'll add the source from now on.
Comments.UserDisplayName: S -
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-05-15T00:13:51.610Z
Comments.Text: This checkmate is mentioned in a Ben Finegold video: https://www.youtube.com/watch?v=0saFg21rbY8
Comments.UserDisplayName: Rebecca J. Stones
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-05-01T00:50:03.987Z
Comments.Text: Ual, Black has FOUR light-bishops o.O
Comments.UserDisplayName: artu-hnrq
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-11-10T12:32:29.033Z
Comments.Text: I did not check all pieces, but it seems to me that Blacks Rh7 and Pg7 can be removed without changing the solution.
Comments.UserDisplayName: Christian H. Kuhn
Tags: <checkmate><problems>
Title: Chess challenge #1: Mate in one
ThreadText: # Chess challenge #1: Mate in one
  
  (Asked by: username_0 on 2015-11-19)
  
  This is the first of a series of challenges I'll be posting regularly. In this case it is just a *simple* mate in one. This is the position:
  
  ```
   [Title "White to mate in one"]
   [FEN "1Bb3BN/R2Pk1pr/1Q5B/4q2R/2bN/4Q1BK/1p/1bq1R1rb w - - 0 1"]
  
  ```
  
  White plays and gives mate. It seems very easy but there are a lot of pieces in the board. I'll be increasing or reducing the level of the challenges based on the answers.
  
  **Tags:** checkmate, problems
  
  > **Comments:**
  > **username_0**: @Bad_Bishop Thanks, I was thinking about something similar. I don't know any "official" source for this one, a member of my chess club showed it to me a few weeks ago, but I don't know where she found it. I'll add the source from now on.  
  > **username_1**: This checkmate is mentioned in a Ben Finegold video: https://www.youtube.com/watch?v=0saFg21rbY8  
  > **username_2**: Ual, Black has FOUR light-bishops o.O  
  > **username_3**: I did not check all pieces, but it seems to me that Blacks Rh7 and Pg7 can be removed without changing the solution.  
  
  ---
  
  ## 4 answers
  
  ### Answer by username_6 on 2015-11-19. Score: 9 | Accepted answer
  
  It seems that
  
  > Qa3
  
  is mate in one. It is indeed harder than it looks at first sight, because there are so many pins.
  
  
  ---
  
  ### Answer by username_4 on 2020-04-30. Score: 2
  
  Nice puzzle, this took me a few minutes.
  
  > The answer is 1.Qa3#.
  
  
  ---
  
  ### Answer by username_5 on 2015-11-20. Score: 1
  
  Moving
  
  > D7 to D8
  
  ending up with 3 Queens
  
  > **Comments:**
  > **username_6**: d7-d8Q would be invalid - the pawn is pinned against the king by the bishop on c8.  
  > **username_7**: @A.A. If we overlook d8 being illegal, a queen on d8 would attack the king in addition to the rook on a7, and Bb7 would block only one of these attacks. I don’t understand your comment.  
  
  ---
  
  ### Answer by username_8 on 2016-05-25. Score: 0
  
  The only escape sqare that isn't currently covered by White is f8.  
  1. Ng6 is the only move which gives check, while also defending f8, without also opening up another escape square.  
  1. Qc5 comes close, but it allows 1… Kd8.
  
  > **Comments:**
  > **username_8**: 1… Bxg6. Nevermind.   
  
  ---
  
  