The work of the famous master P.E. Kondratiev is devoted to the study of one of the most popular closed openings - the Slavic defense. The book summarizes and systematizes rich practical and theoretical material and takes into account the latest research of Soviet and foreign chess players. Of particular interest is the analysis of current contemporary options: the Meran system, the Botvinnik system, etc. At the end of the book are the most informative games played with this debut. In Soviet chess literature, this is the first monograph on the Slavic defense. For people familiar with chess studies.