Grandmaster Romain Edouard is a world class player and member of the French national team. He has won many prestigious tournaments including the Al Ain Open 2012, Dubai Open 2014, World Open 2015 and Montreal Open 2015. He was the second of ex-World Champion V.Topalov and now more recent of the number 2 in the FIDE ranking, GM Maxime Vachier-Lagrave. He is a successful commentator and outstanding author of several books, being also the `Editor in Chief' of Thinkers Publishing.
The concept is unusual but effective. I tried it this way every evening for a week, doing 3 or 4 easy puzzles before attempting some harder ones, and it worked beautifully. Edouard clearly invested a lot of time in selecting the examples. All in all, an enjoyable book of exercises that put me in a good mood for playing: GM Matthew Sadler, New In Chess Magazine 05/2017 - 4 stars rated. Edouard's book is an advanced workbook for the ambitious improver. John Hartmann, CHESSLIFE 08.2017.