The book you have started reading explains the concept of the exchange sacrifice in chess. It is a complex concept where the value of pieces is not determined solely by their numerical value but also by the potential strategic advantage they provide. Beginners are taught the value of pieces using pawns as a unit of measurement, but as players progress, they begin to understand that a material advantage is not always a guarantee of winning. The sacrifice of an exchange, where a player gives up a rook for a bishop and a knight or a pawn, can lead to a strategic advantage. However, many players are hesitant to make this sacrifice due to the fear of losing a material advantage and ending up in a fatal endgame situation. The book explores the psychology behind this fear and offers guidance on how to overcome it. The book also covers the increasing use of exchange sacrifice as a tactical and strategic element in modern games. The author delves into the reasons behind this trend and discusses several open questions related to the exchange sacrifice. By shedding light on this complex concept across many chapters, the book offers a comprehensive understanding of the exchange sacrifice and its importance in chess strategy.