Answers.Body: <p>Obviously, this is not a checkmate. Something else must have happened. 
  Here is what I could imagine:</p>
  
  <ul>
  <li>Maybe you have lost on time, and not by checkmate</li>
  <li>Maybe this is the position before White's last move (Qh6# or Qxh5#), which was played a mili-second before the computer claimed victory - so that the mating position wouldn't have been visible on your screen for long enough for you to notice.</li>
  <li>Maybe (but unlikely) there is some bug in the software. Possibly the software 'played' Qh4xh5# but somehow sent Qh4-g5 to the virtual board for unknown reason.</li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-11-22T15:00:57.787Z
Answers.Text: Neither of the first two suggestions apply; I've updated the question.
Answers.UserDisplayName: GreenMatt
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-03-08T11:42:42.880Z
Answers.Text: @GreenMatt the third one looks to me like what actually happened
Answers.UserDisplayName: David
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-11-22T14:54:28.353Z
Answers.LastActivityDate: 2018-11-22T15:04:14.870Z
Answers.LastEditDate: 2018-11-22T15:04:14.870Z
Answers.UserDisplayName: Evargalo
Body: <p>Playing as black against the chess.com computer, the following position was reached and chess.com declared checkmate in its favor. However, I don't see that the black king is in check. So is this a bug?</p>
  
  <pre><code>[FEN "2r2r2/p6k/2b1p1R1/2pp2Qp/P2P4/1PN5/1K6/8 b - - 0 1"]
  </code></pre>
  
  <p>There was no time limit in effect and this is the final position. There was a message that said "Checkmate" and I couldn't make any more moves. (White's last move was Qg5; it had been on h4.)</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-11-22T14:57:14.413Z
Comments.Text: Can you link the game ? Without the game link it feels unconclusive
Comments.UserDisplayName: Isac
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-11-22T15:08:20.990Z
Comments.Text: Or maybe a screenshot of the actual chess.com interface could help as well.
Comments.UserDisplayName: itub
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-11-22T15:11:34.677Z
Comments.Text: Does it matter? It was game over.
Comments.UserDisplayName: SmallChess
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-11-22T17:46:58.607Z
Comments.Text: @Isac: It seems chess.com doesn't provide a link; it certainly didn't save the game so I could refer back to it. I believe that's the case whenever you play a game against the computer.
Comments.UserDisplayName: GreenMatt
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-11-22T17:47:55.147Z
Comments.Text: @itub: I tried to capture one, but my software wasn't cooperating; thus the PGN diagram.
Comments.UserDisplayName: GreenMatt
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-11-22T17:49:43.240Z
Comments.Text: @SmallChess: Do you want to play using software that finds checkmates when one isn't there?
Comments.UserDisplayName: GreenMatt
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-11-22T17:50:59.413Z
Comments.Text: @GreenMatt It would have been forced mate anyway.
Comments.UserDisplayName: SmallChess
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-11-22T17:53:43.580Z
Comments.Text: @SmallChess: I get that and did at the time. As Evargalo's answer said, the computer **could** have checkmated on that move. However, if the system is so buggy that it says there is checkmate when there isn't one, I don't want to use it, and wouldn't think others would either.
Comments.UserDisplayName: GreenMatt
Tags: <checkmate><online-chess><chess.com>
Title: How is this checkmate ... or does chess.com have a bug?
ThreadText: # How is this checkmate ... or does chess.com have a bug?
  
  (Asked by: username_0 on 2018-11-22)
  
  Playing as black against the chess.com computer, the following position was reached and chess.com declared checkmate in its favor. However, I don't see that the black king is in check. So is this a bug?
  [FEN "2r2r2/p6k/2b1p1R1/2pp2Qp/P2P4/1PN5/1K6/8 b - - 0 1"]
  
  There was no time limit in effect and this is the final position. There was a message that said "Checkmate" and I couldn't make any more moves. (White's last move was Qg5; it had been on h4.)
  
  **Tags:** checkmate, online-chess, chess.com
  
  > **Comments:**
  > **username_1**: Can you link the game ? Without the game link it feels unconclusive  
  > **username_2**: Or maybe a screenshot of the actual chess.com interface could help as well.  
  > **username_3**: Does it matter? It was game over.  
  > **username_0**: @username_1: It seems chess.com doesn't provide a link; it certainly didn't save the game so I could refer back to it. I believe that's the case whenever you play a game against the computer.  
  > **username_0**: @username_2: I tried to capture one, but my software wasn't cooperating; thus the PGN diagram.  
  > **username_0**: @username_3: Do you want to play using software that finds checkmates when one isn't there?  
  > **username_3**: @username_0 It would have been forced mate anyway.  
  > **username_0**: @username_3: I get that and did at the time. As username_4's answer said, the computer **could** have checkmated on that move. However, if the system is so buggy that it says there is checkmate when there isn't one, I don't want to use it, and wouldn't think others would either.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_4 on 2018-11-22. Score: 10 | Accepted answer
  
  Obviously, this is not a checkmate. Something else must have happened.
  Here is what I could imagine:
  
  * Maybe you have lost on time, and not by checkmate
  * Maybe this is the position before White's last move (Qh6# or Qxh5#), which was played a mili-second before the computer claimed victory - so that the mating position wouldn't have been visible on your screen for long enough for you to notice.
  * Maybe (but unlikely) there is some bug in the software. Possibly the software 'played' Qh4xh5# but somehow sent Qh4-g5 to the virtual board for unknown reason.
  
  > **Comments:**
  > **username_0**: Neither of the first two suggestions apply; I've updated the question.  
  > **username_5**: @username_0 the third one looks to me like what actually happened  
  
  ---
  
  