FIDE Laws of Chess
4: The act of moving the pieces
Each move must be made with one hand only.
Provided that he first expresses his intention (e.g. by saying "j'adoube"
or "I adjust"), the player having the move may adjust one or more pieces
on their squares.
Except as provided in Article 4.2, if the player having the move deliberately
touches on the chessboard
one or more of his own pieces, he must move the first piece touched that
can be moved, or
one or more of his opponent's pieces, he must capture the first piece touched,
which can be captured, or
one piece of each colour, he must capture the opponent's piece with his
piece or, if this is illegal, move or capture the first piece touched which
can be moved or captured. If it is unclear, whether the player's own piece
or his opponent's was touched first, the player's own piece shall be considered
to have been touched before his opponent's.
If none of the pieces touched can be moved or captured, the player may
make any legal move.
If a player deliberately touches his king and rook he must castle on that
side if it is legal to do so.
If a player deliberately touches a rook and then his king he is not allowed
to castle on that side on that move and the situation shall be governed
by Article 4.3(a).
If a player, intending to castle, touches the king or king and rook at
the same time, but castling on that side is illegal, the player must make
another legal move with his king which may include castling on the other
side. If the king has no legal move, the player is free to make any legal
A player forfeits his right to a claim against his opponent's violation
of Article 4.3 or 4.4, once he deliberately touches a piece.
When, as a legal move or part of a legal move, a piece has been released
on a square, it cannot then be moved to another square. The move is considered
to have been made when all the relevant requirements of Article 3 have