In this first volume of Cheparinov’s 1.d4! readers will find my own way of working on openings, and the way I analyze. Many of the lines and conclusions in this book are based not only on computer evaluation, but also on the practical point of view. Of course all the lines have been deeply analyzed by strong engines, and although I am sure they are not perfect, the most important thing is that all evaluations are based on my own understanding and knowledge of chess. I believe this book should be used as a starting point, from which to build progress in opening preparation. In the book I reveal many new ideas and concepts. The first volume of the series focuses on 3.f3 against the Grünfeld and King’s Indian, two of the most popular openings against 1.d4. I tried to discuss all possible lines for Black after 3.f3, but of course focused on the most principled ones. Most of the lines are very double-edged. I have revealed some very interesting options for Black as well. This is one of the things that I do in my opening preparation – I look at the openings for both sides. I believe this is very important, because it gives you a realistic view of things. For White I tried to give the lines that I believe are not only the best, but also give Black problems to solve during the game.