The king cant castle through check.
Why is castle illegal?
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Jan 29, 2017
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#5
You can't castle through check. You can't castle to get out of check. You can't castle into check. You can't castle if there is a piece in the way. You can't castle if the King or Rook has already moved.
... I think those are the only restrictions.
Diakonia is right.
If you seek for an answer to your question jump to his answer.
If you want to learn and understand the basic chess-rules (i.e. Castling and how to do it) then check the beginners section here.
Hope this helps you
I arrived at a position today where I could not castle and I can not understand why that is. Please explain.
The game: https://www.chess.com/live/game/1925913982