The touch-move rule is used in serious chess play. If a player intentionally touches a piece on the board when it is his term to move, then he must move or capture that piece, if it is legal to do so. The accidental brushing of a piece does not count as intentionally touching it. If a player's opponent violates the rule, he must claim the violation before making a move. A player may not touch the pieces on the board if it is the other player's turn to move. If a player wants to adjust a piece on its square without being required to move it, he can announce "adjust" or "j’adoube" before touching the piece .
If a player touches a hostile piece then he must capture it if the piece can be captured. If a player touches one of his pieces and an opponent's piece, he must make that capture if it is a legal move, otherwise he is required to move or capture the first of the pieces that he touched. If it can not be determined whether he touched his own piece or the opponent's piece first, it is assumed that he touched his own piece first. If a player touches more than one piece, he must move or capture the first piece that can be legally moved or captured. An exception to that is an attempted illegal castling; in that case the king must be moved if possible, but otherwise there is no requirement to move the rook.
When castling, the king must be the first piece touched. If the player touches his rook at the same time as touching the king, he must castle with that rook if it is legal to do so. If the player completes a two-square king move without touching a rook, he must move the correct rook accordingly if castling in that direction is legal, and otherwise the move must be reverted and another king move made.
When a pawn is moved to its eighth rank, once the player takes his hand off the pawn, it can no longer be substituted for a different move of the pawn. However, the move is not complete until the promoted piece is released on that square .
The phrase is used to give warning from a player to his opponent that he is about to touch a piece on the board, typically to centralise it on its square, without the intent of making a move with it. The touched piece rule requires that such a warning be given. Whilst this French term is customary, it is not obligatory; other similar indications may be used. A player may adjust a piece in this way only when it is his turn to move.