Defense of Karo-Kann is one of the most popular modern debuts, which is firmly included in the repertoire of most elite chess players. The author of the book, a well-known grandmaster and theorist, offers a complete repertoire for blacks in response to 1.e4, explains in detail the main strategic ideas of each option and gives the exact order of moves, offers a number of novelties in current schemes. Each chapter considers alternative plans for Black, so that the reader can make choices according to their taste, and it is more difficult for the opponent to prepare.