Okay. if you leave me now ?....take something away from this.
In a game where a scoresheet is NOT required (like in blitz) ?....then there is NO SUCH THING as an illegal move.
Here's a beautiful castle !....which begs of me as to why castling 'thru' a knight isn't always a no-no.
....but this is illegal ?....as white can make a case to a dumb TD that the knight cannot occupy both b1 AND d1.
Which leads me to believe that castling 'thru' a knight is only illegal if the knight can occupy c1 - right ? IOW's, is there no such thing as castling 'thru' a knight check ?
Okay. if you leave me now ?....take something away from this.
In a game where a scoresheet is NOT required (like in blitz) ?....then there is NO SUCH THING as an illegal move.