You are not allowed to castle right on the move you are checked to escape the check, but as soon as your king is no longer in check on the next move you may castle.
For more information : https://support.chess.com/article/266-how-do-i-castle
Is this legal?
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Feb 26, 2024
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#3
In order to castle, the king and rook cannot have moved from their original positions. In your game, black's king was allowed to castle because the king and rook had not moved; the fact that the king had been checked once already doesn't matter, since the king didn't move to escape the check. White's king moved to get out of check, making it illegal for white to castle from that point on.
I have challenged the Engine @ maximum setting. I was playing with white. In 8th move I have checked the Engine's King. But after that in 11th move Engine castled. Is it legal? More to surprise me when I try to castle after got check, system didn't allow me.