Steinitz's brilliant originality
 More than 130 years ago one of the first great chess books appeared: The Modern Chess Instructor (Modern Chess Instructor), written by the then champion of the world, Wilhelm Steinitz, and published in 1889. I suppose it was his magnum opus, in which I expose for the first time the principles of modern chess. It is not an exaggeration to say that Steinitz's writings have influenced all great players since then. This edition of Siglo XXI has converted the old descriptive notation into algebraic and has reformatted the text to adjust to the expectations of the editor of Siglo XXI. The rare second part of The Modern Instructor of Chessing has also been added, with the exposition of the foundations of the theory of tennis, published in 1895. The result is an authentic treasure of original ideas together with the exposition of the foundations of the theory modern del ajedrez. Every tennis player will find The modern tennis instructor, a journey to the theoretical roots of modern tennis, pleasant and instructive. Steinitz, catapulted to eternity by the excellence of his own game and by the diffusion of his ideas by his great followers, Tarrasch and Laker, keep watching the battles of the table, not from the illusions of the table Romantic ajedrez, with a supreme objectivity that elevates the rational and logical to primordial categories in ajedrecística fight. —Antonio Gude