j'adoube
j'adoube ([ ʒadub ], French adouber = "to knight", here: "I'm moving") is a term from the game of chess .
application
J'adoube or some other unequivocal announcement must be made by a chess player before correctly placing an inaccurately placed piece on a playing field. If he does not do this, the rule “Touched, guided!” Applies . If you have deliberately touched your own piece, you must move it, if this is legally possible. If you deliberately touched an enemy, he must be beaten if this is possible according to the rules, no matter how unfavorable the corresponding action may be for you. Adjusting the opponent's figures is considered impolite and can be seen as unsporting.
Historical
The Yugoslavian grandmaster Milan Matulović took back a weak move in a game against István Bilek at the interzonal tournament in Sousse in 1967, citing this rule. Despite witnessing the incident, the referee allowed the withdrawal to go through, but it earned Matulović the nickname “Jadoubovic”.