In this book, we pay most attention to the Gruenfeld Defence (part 1) and to the King´s Indian Defence (part 2). In the process of choosing systems against these opening, the author has emphasized on the principle of reliability. Against the Gruenfeld Defence, we analyse the Modern Exchange variation with Be3 And Qd2, in which there often arises a transfer into an endgame, slightly preferable for White. Against the King´s Indian Defence, our main opening weapon is the Averbakh system, wich has been thoroughly analyse. Black can hardly begin there any active actions on the kingside. It is also worth mentioning that is reply to the move 1...d6 (parts 3 and 4 of the book), we analyse 2.e4, therefore this book will be useful also to the readers who like beginning their games with the move 1.e2-e4.