Alekhine's defense - a daring debut , challenging all the classical rules of the game at the beginning of the chess game - eventually turned into a flexible system allowing blacks at their own discretion or to agree to "extreme" options, or move to maneuvering on three horizontals to be released at a convenient moment. This debut is relatively rarely chosen by elite grandmasters, thanks to which it is far from exhausted to the bottom and quickly leads to live game positions. Choosing it, the blacks set themselves the task of winning, and not just fighting for a draw .. From players, both white and black, Alekhine’s defense requires specific knowledge, while books devoted to this protection in Russian have not been published for almost 30 years. This edition, consisting of 16 parts and 87 chapters, considers, among others, the lines of defense, the practice of which dates exclusively from the twenty-first century. Thanks to modern technology and in-depth analysis, the estimates of many previously known variants have also been changed.