Answers.Body: <pre><code>[FEN &quot;K3k2n/7n/rr1R3N/7n/8/8/4BQ2/4R3 w - - 0 1&quot;]
  
  1. Bxa6#
  </code></pre>
  <p>Here is a much more simple situation where White only has only one legal move, which is a discovered checkmate.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-04-12T22:32:17.890Z
Answers.LastActivityDate: 2021-04-12T22:35:57.223Z
Answers.LastEditDate: 2021-04-12T22:35:57.223Z
Answers.UserDisplayName: yogazefish
Answers.Body: <p>This is a very easy concept to construct, and it has already been done on Tim Krabbe's site as noted by Ian Bush in a comment. Here are the current records, i.e. the highest that has been constructed by chess problemists so far.</p>
  <p>I found two cases of <strong>55</strong> forced mates with promoted pieces in Tim Krabbe’s <a href="https://timkr.home.xs4all.nl/chess2/diary.htm" rel="noreferrer">Diary Entry #383</a>.</p>
  <pre><code>[Title &quot;Ludwig Zagler, Feenschach 1972, 55 Forced Mates&quot;]
  [FEN &quot;1rB1Q1Q1/1PRQ3Q/2b2k2/2pQ1N1Q/4KRPp/5N2/1R6/B3nn1b w - - 0 1&quot;]
  </code></pre>
  <hr />
  <pre><code>[Title &quot;Sampsa Lahtonen, Tim Krabbe's Website Diary Entry #383 2008, 55 Forced Mates&quot;]
  [FEN &quot;B3n1bb/1R6/4pN2/4KRPp/2pQ1N1Q/2b2k2/1PRQ3Q/1rB1Q1Q1 w - - 0 1&quot;]
  </code></pre>
  <p>Without promoted pieces, the record is 29, as Krabbe reported in his <a href="https://timkr.home.xs4all.nl/chess2/diary_17.htm" rel="noreferrer">Diary Entry #334.</a></p>
  <pre><code>[Title &quot;Harold Holgate Cross, The Problemist FCS 4/1936, 2251&quot;]
  [fen &quot;8/1b6/p1N5/P1r5/P3KPr1/QBk1NRP1/P2R1P2/4B3 w KQkq - 0 1&quot;]
  </code></pre>
  
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Answers.CreationDate: 2021-04-13T07:37:21.137Z
Answers.Text: Just for fun, I mention this (surely minimal) position with only 5 men and two forced mates: Ka1 Qb1 Rb2 - Ka3 Qa2.
Answers.UserDisplayName: Hauke Reddmann
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Answers.LastEditDate: 2021-04-12T22:39:15.817Z
Answers.UserDisplayName: Rewan Demontay
Body: <p>I was thinking about a situation on a chessboard. You can call it a riddle, but I am not sure whether it is solvable or not.</p>
  <p>Let's say that there are more than 5 pieces for both Black and White, including the kings, on a chessboard and it is White's turn.</p>
  <p>The Riddle: Is it possible to arrange all the pieces on the chessboard, in such a manner, so that, for <strong>every possible move</strong> by White, the Black king gets checkmated? Can you construct such a position?</p>
  <hr />
  <p>What I've thought so far:</p>
  <p>Since King can't give a checkmate (apart from exceptional cases of a two queens/two rook mate), the White king should be immovable. Otherwise, the criteria of the riddle can't be fulfilled. But thinking about it this way, I can't set up any position that meets the criteria of my riddle.=</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-04-12T22:02:09.563Z
Comments.Text: No reason I can see that the White King has to be immobile if when it moves a discovered check gives mate. Tim Krabbe's site might be a good place to search for this.
Comments.UserDisplayName: Ian Bush
Tags: <problems><forced-move>
Title: An interesting positional chess riddle
ThreadText: # An interesting positional chess riddle
  
  (Asked by: username_0 on 2021-04-12)
  
  I was thinking about a situation on a chessboard. You can call it a riddle, but I am not sure whether it is solvable or not.
  
  Let's say that there are more than 5 pieces for both Black and White, including the kings, on a chessboard and it is White's turn.
  
  The Riddle: Is it possible to arrange all the pieces on the chessboard, in such a manner, so that, for **every possible move** by White, the Black king gets checkmated? Can you construct such a position?
  
  ---
  
  What I've thought so far:
  
  Since King can't give a checkmate (apart from exceptional cases of a two queens/two rook mate), the White king should be immovable. Otherwise, the criteria of the riddle can't be fulfilled. But thinking about it this way, I can't set up any position that meets the criteria of my riddle.=
  
  **Tags:** problems, forced-move
  
  > **Comments:**
  > **username_1**: No reason I can see that the White King has to be immobile if when it moves a discovered check gives mate. Tim Krabbe's site might be a good place to search for this.  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_2 on 2021-04-12. Score: 8
  
  ```
  [FEN "K3k2n/7n/rr1R3N/7n/8/8/4BQ2/4R3 w - - 0 1"]
  
  1. Bxa6#
  
  ```
  
  Here is a much more simple situation where White only has only one legal move, which is a discovered checkmate.
  
  
  ---
  
  ### Answer by username_3 on 2021-04-12. Score: 4
  
  This is a very easy concept to construct, and it has already been done on Tim Krabbe's site as noted by Ian username_1 in a comment. Here are the current records, i.e. the highest that has been constructed by chess problemists so far.
  
  I found two cases of **55** forced mates with promoted pieces in Tim Krabbe’s [Diary Entry #383](https://timkr.home.xs4all.nl/chess2/diary.htm).
  
  ```
  [Title "Ludwig Zagler, Feenschach 1972, 55 Forced Mates"]
  [FEN "1rB1Q1Q1/1PRQ3Q/2b2k2/2pQ1N1Q/4KRPp/5N2/1R6/B3nn1b w - - 0 1"]
  
  ```
  
  ---
  
  ```
  [Title "Sampsa Lahtonen, Tim Krabbe's Website Diary Entry #383 2008, 55 Forced Mates"]
  [FEN "B3n1bb/1R6/4pN2/4KRPp/2pQ1N1Q/2b2k2/1PRQ3Q/1rB1Q1Q1 w - - 0 1"]
  
  ```
  
  Without promoted pieces, the record is 29, as Krabbe reported in his [Diary Entry #334.](https://timkr.home.xs4all.nl/chess2/diary_17.htm)
  
  ```
  [Title "Harold Holgate Cross, The Problemist FCS 4/1936, 2251"]
  [fen "8/1b6/p1N5/P1r5/P3KPr1/QBk1NRP1/P2R1P2/4B3 w KQkq - 0 1"]
  
  ```
  
  > **Comments:**
  > **username_4**: Just for fun, I mention this (surely minimal) position with only 5 men and two forced mates: Ka1 Qb1 Rb2 - Ka3 Qa2.  
  
  ---
  
  