As per the rules of chess, moving two pieces in a single turn is not allowed. Moreover, a king can not move more than one square in a single turn.
However, there is a condition where both of these invalid moves are allowed in a single turn. And such a move is called castling in chess.
Castling in chess is a special move where you can move two pieces at a time in a single turn. The King moves two squares towards the rook, and the Rook also moves to a square adjacent to the King.
If you want to use this move to play chess more trickly, you can learn it in the simple steps below.
Step 1. Check for the Castling Conditions
As a beginner, you might feel it illegal or unfair move. But that’s not the case at all. As per rule, it is allowed, but only if the specified conditions meet.
1. King and the Rook must be at the original positions.
Make sure both the chess pieces are in the 1st rank at their original positions. Both castling pieces should be at the same squares where you placed them while setting up the chessboard at the beginning.
2. Both of the castling pieces had never moved before.
Only being placed at the correct position is not enough to avail a chance of castling. You also need to meet a condition where any castling piece must not move ever before in the gameplay.
If any castling piece once moved and comes back to the right position, you are still not eligible to castle. Both the King and the Rook must be at the correct square and had never moved in the game.
3. There should be no piece placed between King and the Castling Rook.
For castling in chess, all the squares between the King and the Rook must be empty. If any of the passing squares have a piece placed, you can not castle.
4. King should not be in check.
To meet the criteria of castling, King must not be in check from anywhere. However, if the Rook is under attack at the current position, you are allowed to castle.
5. King should not pass through check.
King must not be getting a check in passing square to castle successfully. Otherwise, you are not allowed to castle that square is currently under attack.
6. King should not end up in check.
As the passing square must not be under attack, the destination square also must not be under attack to perform castling in chess. If King is getting a check at the destination square, you are not allowed to castle right now.
Step 2. Move King 2 Squares Towards the Rook
Move the King two squares towards the Rook you want to castle with. The destination square color will always be the same as the current square. Such that, if King is currently at the white square, move it to the next white square in the same rank towards Rook, skipping one square of the opposite color.
Step 3. Move the Rook to the Other Side of the King
In regular chess, you can not move more than one piece in a single turn. But while castling in chess, you have to move two pieces, the King and the Rook in a single move.
After moving the King two squares towards the Rook, place the Rook at the adjacent square of the King at the other side. In simple words, Rook will jump over the king and occupy the neighboring square of the King at the opposite side.