The monograph of the master G. Fridshtein, known for his work in the field of opening theory, is devoted to one of the most relevant chess beginnings, which is included in the repertoire of the strongest grandmasters of the world. It summarizes and systematizes rich practical and theoretical material, takes into account the latest research of Soviet and foreign chess players in the defense of Pirc-Ufimtsev. The book provides explanatory parts with comments by the author. Designed for highly skilled chess players.