Answers.Body: <p>If your question is "Do I have to tell my opponent that he just made a move from where checkmate is forced?", the answer is "No", you don't have to tell your opponent he is setting himself up for checkmate. In fact, that is rather the point of the game!</p>
  
  <p>The only times you <em>have</em> to tell anything to your opponent is:</p>
  
  <ul>
  <li>When offering a draw</li>
  <li>When you want to adjust a piece.</li>
  </ul>
  
  <p>If your question is "Do I have to tell my opponent that he is in checkmate?", the answer is still <em>technically</em> "No". Even the customary "Check" and "Checkmate" are optional. </p>
  
  <p>Practically, if your opponent does not grasp that he is in checkmate it may be useful to point that out to him one way or another, and the traditional "Checkmate!" should do the trick.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-03-08T23:22:42.327Z
Answers.Text: Don't you have to tell your opponent when you're resigning?
Answers.UserDisplayName: bof
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-03-13T13:48:52.220Z
Answers.Text: @user8213 dubious. Then touch move wouldn't exist.
Answers.UserDisplayName: Jossie Calderon
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-03-18T15:37:22.487Z
Answers.Text: You shake hands if you resign. There is another thing to tell. "Check." If the opponent has no answer to this, it is over with a handshake. No need to tell anything else. Touch move exists, you don't have to say you adjust ONLY on the beginning of the game, before the clock starts.
Answers.UserDisplayName: George Eco
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-06-12T19:52:46.380Z
Answers.LastActivityDate: 2015-06-12T20:05:07.513Z
Answers.LastEditDate: 2015-06-12T20:05:07.513Z
Answers.UserDisplayName: firtydank
Answers.Body: <p>I think you are confusing <em>check</em> and <em>checkmate</em>. Check is the situation where a king is under attack from another piece. Checkmate is where that is the case, the king's side has the move, but there is no move possible that stops the check.</p>
  
  <p>Your opponent <em>isn't allowed</em> to play any move that puts himself into check. So if he does, you have to tell him, and he has to <em>take the move back</em> and play something else. With the same piece if possible (touch move rule).</p>
  
  <p>In tournament play, there are often penalties involved if you play an illegal move, like some minutes extra time for the opponent, or the loss of the game (common in blitz, or if it's the second or third illegal move you play in the same game).</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-03-11T09:22:15.063Z
Answers.LastActivityDate: 2019-03-11T09:22:15.063Z
Answers.UserDisplayName: RemcoGerlich
Body: <p>Do you have to tell someone that they set them selves up for a check mate? For example if the queen is guarding the king on both ends and one person moves there queen to the left. Does the opposite person have to tell the opponent that they set them selves up?</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2015-06-12T21:59:46.453Z
Comments.Text: I think this question also confuses checkmate with taking the king.
Comments.UserDisplayName: Dag Oskar Madsen
Tags: <rules><checkmate>
Title: Acknowledging a check mate
ThreadText: # Acknowledging a check mate
  
  (Asked by: username_0 on 2015-06-12)
  
  Do you have to tell someone that they set them selves up for a check mate? For example if the queen is guarding the king on both ends and one person moves there queen to the left. Does the opposite person have to tell the opponent that they set them selves up?
  
  **Tags:** rules, checkmate
  
  > **Comments:**
  > **username_1**: I think this question also confuses checkmate with taking the king.  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_2 on 2015-06-12. Score: 5
  
  If your question is "Do I have to tell my opponent that he just made a move from where checkmate is forced?", the answer is "No", you don't have to tell your opponent he is setting himself up for checkmate. In fact, that is rather the point of the game!
  
  The only times you *have* to tell anything to your opponent is:
  
  * When offering a draw
  * When you want to adjust a piece.
  
  If your question is "Do I have to tell my opponent that he is in checkmate?", the answer is still *technically* "No". Even the customary "Check" and "Checkmate" are optional.
  
  Practically, if your opponent does not grasp that he is in checkmate it may be useful to point that out to him one way or another, and the traditional "Checkmate!" should do the trick.
  
  > **Comments:**
  > **username_3**: Don't you have to tell your opponent when you're resigning?  
  > **username_4**: @user8213 dubious. Then touch move wouldn't exist.  
  > **username_5**: You shake hands if you resign. There is another thing to tell. "Check." If the opponent has no answer to this, it is over with a handshake. No need to tell anything else. Touch move exists, you don't have to say you adjust ONLY on the beginning of the game, before the clock starts.  
  
  ---
  
  ### Answer by username_6 on 2019-03-11. Score: 3
  
  I think you are confusing *check* and *checkmate*. Check is the situation where a king is under attack from another piece. Checkmate is where that is the case, the king's side has the move, but there is no move possible that stops the check.
  
  Your opponent *isn't allowed* to play any move that puts himself into check. So if he does, you have to tell him, and he has to *take the move back* and play something else. With the same piece if possible (touch move rule).
  
  In tournament play, there are often penalties involved if you play an illegal move, like some minutes extra time for the opponent, or the loss of the game (common in blitz, or if it's the second or third illegal move you play in the same game).
  
  
  ---
  
  