Ruy López de Segura
Original title: Libro de la invención liberal y arte del juego del axedrez
Ruy López de Segura's treatise of 1561 presents chess as an activity founded on knowledge, reasoning and the art of making choices. The author begins with the game's origins, merits and rules, gradually turning to a detailed investigation of practice. He seeks to explain both a move and the grounds for preferring one continuation to another.
The book examines openings, attacking and defensive possibilities, play under different conditions and games at odds. Ruy López disputes his predecessors' views, tests proposed solutions and develops variations of his own. These comparisons show chess instruction becoming systematic critical work: an assessment requires proof, and a promising idea must withstand the opponent's replies.
The treatise offers far more than the opening that bears its author's name today. It preserves an entire system of ideas about mid-sixteenth-century chess, including rules not yet standardised and the language used to explain play. It rewards reading with a board nearby, tracing extended arguments, comparing defences and observing chess theory grow from individual practical insights.
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