Edouard, Romain: Chess Calculation Training vol. 1 (PB)
The author focused in his first volume of pure chess calculation on middlegames. Romain has carefully selected 496 positions, which arose in real games in the recent past. He separated the exercises into 11 different categories, covering both tactics and strategy, attack and defence. This book is a fantastic training tool for any player to improve his level of chess thinking.