Answers.Body: <p>If the app first displayed checkmate in that position, then it miscalculated.</p>
  
  <p>But as Phonon noted, the app could have displayed checkmate in a previous (future) position, and then you went back a few moves. In that case it's not a miscalculation per se, but just a bug in the UI.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2019-01-25T19:00:15.643Z
Answers.LastActivityDate: 2019-01-25T19:00:15.643Z
Answers.UserDisplayName: Inertial Ignorance
Body: <p><img src="https://i.sstatic.net/hdMhT.jpg" alt="enter image description here"></p>
  
  <p>How is this checkmate? The King isn't even in check! Am I missing something, or did the chess app goof up?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-01-24T20:09:42.577Z
Comments.Text: Current position is definitely not a checkmate, but if it's white's turn then there's a mate in 2 after `Bh6+ Ke8 Rg8#.` Maybe it's a display bug, where a checkmate happened at some point and you undid a couple of moves but the "Checkmate" message remained.
Comments.UserDisplayName: Ellie
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2019-01-24T23:24:25.280Z
Comments.Text: @Phonon You're correct. The app shows "Checkmate" after undos.
Comments.UserDisplayName: SmallChess
Tags: <checkmate>
Title: App Mis-calculated Checkmate?
ThreadText: # App Mis-calculated Checkmate?
  
  (Asked by: username_0 on 2019-01-24)
  
  ![enter image description here](https://i.sstatic.net/hdMhT.jpg)
  
  How is this checkmate? The King isn't even in check! Am I missing something, or did the chess app goof up?
  
  **Tags:** checkmate
  
  > **Comments:**
  > **username_1**: Current position is definitely not a checkmate, but if it's white's turn then there's a mate in 2 after `Bh6+ Ke8 Rg8#.` Maybe it's a display bug, where a checkmate happened at some point and you undid a couple of moves but the "Checkmate" message remained.  
  > **username_2**: @Phonon You're correct. The app shows "Checkmate" after undos.  
  
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  ## 1 answers
  
  ### Answer by username_3 on 2019-01-25. Score: 3
  
  If the app first displayed checkmate in that position, then it miscalculated.
  
  But as Phonon noted, the app could have displayed checkmate in a previous (future) position, and then you went back a few moves. In that case it's not a miscalculation per se, but just a bug in the UI.
  
  
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