"Yusupov series of books (Build up your chess, Boost your chess, Chess Evolution) for players in 1000-2200 level approx. is good recommendation."
GM Ramesh, probably the best trainer in the world. Trainer of Praggnanandhaa, Aravind and many other promising young Indians "The present work follows the model set by its predecessors dealing with a mixture of tactics, endgames, strategy, ... Read morepositional play, openings, how to calculate, etc. Each chapter concludes with a dozen exercises that offer the student the opportunity to test what they have learned. Detailed solutions and a scoring program are also offered."
IM John Donaldson "I would like to once again draw attention to the perfect chess lessons by Artur Yusupov, published in no less than nine beautiful parts by Quality Chess."
Bab Wilders, Nederlands Dagblad Show Less