. The Turk could nod twice if it threatened its opponent's queen, and three times upon placing the king in check. If an opponent made an illegal move, the Turk would shake its head, move the piece back and make its own move, thus forcing a forfeit of its opponent's move.[20] Louis Dutens, a traveller who observed a showing of the Turk, attempted to trick the machine "by giving the Queen the move of a Knight, but my mechanic opponent was not to be so imposed upon; he took up my Queen and replaced her in the square from which I had moved her. Another part of the machine's exhibition was the completion of the knight's tour, a famed chess puzzle. The puzzle requires the player to move a knight around a chessboard, touching each square once along the way. While most experienced chess players of the time still struggled with the puzzle, the Turk was capable of completing the tour wit
