Most chess games end in the middlegame. Therefore, to achieve good results, you have to play well at this stage of the game. This middlegame textbook by Grandmaster Alexander Galkin, who was named Children’s Trainer of the Year in 2016 by the Russian Chess Federation, and Woman International Master Anastasia Travkina, provides a large volume of practical knowledge. The vast majority of middlegame tactics and positional textbooks contain a selection of positions and exercises where the student is asked to find a tactic, carry out an attack against the enemy king or choose the right positional approach based on certain “rules”. However, there is not much focus on the mistake by one of the players that led to the critical position where the combination, decisive attack or positional improvement became possible.