Retii opening 1.Nf3 d5 for White repertoire. The author discusses two main ways for White to continue: 1) variants arising after 2.e3 followed by c4 (chapter 1, about 120 pages) and 2) variants after 2.e3 with b2-b3 (chapter 3, about 70 pages). Chapter 2 additionally discusses the variant 1.Nf3 d5 2.c4 d4 3.b4. Each variant contains both explanations and annotated games. IM Semko Semkov is acclaimed author and theoretician. He is author or co-author of Attacking the English/Reti, The Modern English, Playing for a win with ...b6, The Most Flexible Sicilian, Understanding the QGA and other books. Further information about the book and a sample are available at chess-stars.com. 2 pictures.