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How is this checkmate? The King isn't even in check! Am I missing something, or did the chess app goof up?

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    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. – Phonon Jan 24 at 20:09
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    @Phonon You're correct. The app shows "Checkmate" after undos. – SmallChess Jan 24 at 23:24
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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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