Handbuch des Schachspiels (Handbook of Chess, often simply called the Handbuch) is a chess book, first published in 1843 by Tassilo von Heydebrand und der Lasa. It was a comprehensive reference book on the game, and one of the most important references on opening theory for many decades. The Handbuch had been the project of Paul Rudolf von Bilguer, who was with von der Lasa a member of the Berlin Chess Club and the influential group of chess masters later called the Berlin Pleiades. Bilguer died in 1840, with the work still in the early stages. Von der Lasa completed the project and saw it published, with his friend von Bilguer alone named as author. It contained comprehensive analyses of all opening variations then known, plus a section on the history and literature of chess.