I learned a new chess rule! You can’t pass through a check when castling. ♟️
@christopherchelpka can't pass through a check eh. So, if there was a rook between your rook and king, you couldn't castle? I remembered something about check and castling but I didn't remember this!
@ChrisJWilson in that situation there’s a couple reasons why you can’t castle. One is that you can’t have any pieces between the rook and the king. Another reason is that the king would be in check, and you can’t castle while in check. Another way to describe the rule I’m talking about is to say that castling is not allowed if the king is under a direct attack, move through any direct attacks, or end under direct attack.
@christopherchelpka Turns out there are a lot of great articles and videos on castling rules. With regard to the rule I’m talking about, this one says:
Nor can you castle while in check. However, you can castle with a rook that is under attack at the time, and the rook can pass through an attacked square when castling while the king cannot. (Amusingly, this was once called into question at the highest level, when a top Grandmaster, Viktor Korchnoi, went to confirm with the arbiter that he could castle with his rook under attack during a game with Karpov in 1974.)