The book is intended for intermediate and stronger players. The theme of the book is how to apply knowledge to a real chess game. The difference between strong players who can do it and others is the imaginary secret ingredient in the book title. How to win a game? How to use a Bishop pair? How not to be stressed? How to increase the activity of pieces? How to prepare for a particular opponent? How to make efficient choices? The topics are explained by both authors. GM Jan Markos, born. 1985, is for many years one of the best Slovak chess players, or the best one. GM David Navara, born 1985, is Czech number one since 2003, he is 10x Czech champion, his peak rating was 2751. Further information about the book is available at qualitychess.co.uk. Picture 2 shows contents of the book.