The book of the international master Maxim Chetverik is devoted to the protection of Bogolyubov with the basic order of moves l.d4 Kf6 2.c4 e6 3.Kf3 b4 Cb4 +. Despite the extensive practice of this debut (including at the highest level), there were no monographs in Russian before. Thematically, the work is close to the previous debut work of the author "New Indian Defense. System 4.g3" and to a certain extent is its addition and continuation. 114 commented parties are grouped in 20 chapters, united in three parts. Grandmaster practice of recent years with a number of original analyzes is covered in detail. Actual sequels are given for both sides, which expands the target audience of readers.