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Question: Special Moves of Chess

Answer: 1. Castling

Castling is a special move in chess that involves the King and the Rook. This is the only situation in which you would move two of your own chess pieces in the same move. The King and the Rook move towards each other and swap places. To do this, move your King not one, but two spaces towards the Rook you are castling with. Then place the Rook on the opposite side of the King (shown in the diagram to the right). This can be done on either the King side or Queen side, however there are several prerequisites:

The king and rook may not have moved, there must not be any obstructing pieces between them, and the King must not move through check in order to complete the move.

2. En Passant

This special move involves the Pawn. As mentioned earlier, this chess piece has the unique ability to move two spaces for its first move on the chessboard.

Some may use this as an opportunity to avoid capture from an approaching pawn by passing the opposing chess piece with that double move. If this is done, the other player may make an "en passant", or "in passing" capture.

Although the pawn has passed the capture square of the opposing side, that player can move his or her chess piece diagonally, as it does in capture, to the square that the other player had skipped. The pawn that made the double move has been considered captured in passing, and is removed from the chessboard.

(Source: ChessUSA, 14 Jan 2021)

Source Link: https://www.chessusa.com/chess-rules.html