What are the 5 castling rules? I can only think of:
Castling can be done only if the king hasn't moved yet, and there are no pieces between the king & rook.
No castling through check
When castling, the king moves two spaces to the left or the right, and the rook goes one space next to the king opposite of where it started.
Can't think of any other rules
1.) all of the spaces between the king and the rook must be cleared
2.) must be kings first move
3.) must be the rook in question's first move
4.) King can't land in check
5.) King may not pass through check
many people don't know about rule #5 but when you think about it it makes sense
Giving up Queen for castle is a negative ev play. I think for beginners castleing is a safe play if you are unsure of your next move and want to see what your opponet will play. It can help you safegaurd king and position rook for attack on open file but I think it is mostly situational. Don't play your pieces simply to castle.