Chess Explained is a new series of books about chess openings. They are not theoretical works in the traditional sense, but more a series of lessons from a chess expert with extensive over-the-board experience with an opening. It is as if you were sitting at the board with a chess coach answering your questions about the plans for both sides, the ideas behind particular moves, and what specific knowledge you need to have. The Nimzo-Indian is one of the most important of all chess openings, and popular at all levels of play. The Nimzo has provided the backbone of the opening repertoire of a large portion of the world's top players over the last 80 years. It is considered a fully reliable defense, and provides winning chances for both sides as it leads to structures of great strategic variety and complexity. Key battlegrounds in the Nimzo include the blockade, IQP positions, the handling of unbalanced pawn-structures, and the struggle between bishop and knight. All these topics are covered in depth in this book, and an understanding of them will prove valuable in a much broader context than just the Nimzo-Indian.