1,205 best tactical positions, grouped according to their topics. Intended for chess players with ELO 1600-2400. This chess exercise book is written by an experienced coach, International Grandmaster of ICCF. It contains more than 1400 exercises that are arranged very precisely after various combinational motifs. Languages: English, Spanish and Russian together. 305 pages. Soft color cover. Moscow, 2006.
These tactical puzzles are the basis of the computer program Ct-Art. If you like this sort of thing, you can buy an inexpensive program called Ct-ART for your android phone by Chess King that cost under ten bucks. A bargain and will give you many months (perhaps years) of study material . it just depends your preference for the written word vs interactive puzzles. I commend Blokh for selecting a very instructive set of problems.
This book was out of print for a while. I believe it is now available again.