(Tactical skill of a chess player. Textbook in 3 volumes. Volume 2: Fundamentals of calculation techniques). The second part of the trilogy devoted to chess tactics focuses mainly on calculation. It deals with tactical possibilities in the position, concentration and imagination involvement, calculation technique (move order, zwischenzug, quiet move), new possibilities related to the tree of variants, the economy of calculation, etc. Unlike other similar editions, the author considers chess tactics as a whole, in complex with strategy and elements of psychology. The basis is the author's original methodology, which has proven itself perfectly in working with chess players of various qualifications. Perfectly chosen examples, clear logical structure and consistency in presentation make it easy to understand the material. In addition to the explanations, the book contains ca 250 examples for solving. Name index at the end. 3 pictures.