F8 is being scanned by the white queen on A3. The king can't put itself in check nor in a square it would be in check if it was moving one square at a time when it's trying to castle. This is a common tactic to prevent a person from castling.
why cant i castle in this position
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That's an enlightening response. I didn't know about the one square at a time rule. I too had a game where it was a mystery to me why I couldn't castle on one move, but managed it afterwards.
Jul 4, 2023
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#4
The one square at a time principle also holds true and is the reason for en passant.
never moved my king or my left rook, so annoying, had to draw