This book is about the Nimzo-IndianClassical line 4.Qc2 (also known as the Capablanca Variation) and the 4.Bd2-line, for which basically I couldnot find an established name. The 4.Bd2 linehas never been covered in such a comprehensive way in any book before. In thetext I suggest that this line should have the combined name ofTartakower-Duchamp line because Tartakower played it often, while to mysurprise Marcel Duchamp (who was also a famous French artist) played it too inthe 1930s and indeed in a very good positional fashion against strong players. Some of those games are in the book.Now this line enjoys greater popularitythan ever before. About the Classical line with 4. Qc2 there isnothing much to add, except for the fact that it has become hugely popular, butunfortunately from my point of view it involves too much engine-style chess.