(in English known as The Ragozin Complex. A Guide for White and Black). The book covers lines of the Queens Gambit where Black plays Bb4. It is the first time when it is explained in a comprehensive book. Material is divided into 7 chapters by the Whites 5th move: 5.Qa4+, 5.Qc2, 5.Qb3, 5.a3, 5.e3, 5.Bg5, 5.exd5. Some players who had the variation in their repertoire are Alekhine and Capablanca, or from current players Aronian, Kramnik or Ivanchuk. This is not a repertoire book - the analysis can be used for both sides. The book contains both analysis and word explanations, with several indexes at the end.