The Touch-Move Rule
In over-the-board chess, the touch-move rule is one of the most important regulations: if you deliberately touch a piece, you must move it. Here is how it works in both OTB and online play.
The rule
If you deliberately touch one of your own pieces when it is your turn, you must move that piece (if a legal move exists). If you touch an opponent's piece, you must capture it (if a legal capture exists). If no legal move/capture involving the touched piece exists, there is no penalty.
J'adoube
To adjust a piece on its square without being forced to move it, say "j'adoube" ("I adjust") before touching it. See our full j'adoube guide.
Online enforcement
Online chess platforms use a different system: pre-move and click-to-move. Once you click a piece and place it on a square, the move is made. Most platforms allow you to drag a piece back to its original square to cancel the move (before releasing). This is more forgiving than OTB touch-move.
Famous incidents
The touch-move rule has caused controversy even at World Championship level. Disputes often arise when a player accidentally brushes a piece or claims the touch was unintentional. The arbiter's decision is final in these situations.