Ruy López de Segura Ruy López de Segura Rodrigo (Ruy) López de Segura (c. 1530 – c. 1580) was a Spanish priest and later bishop in Segura whose 1561 book "Libro de la invención liberal y arte del juego del Axedrez" was one of the first definitive books about modern chess in Europe, preceded only by Pedro Damiano's 1512 book, Luis Ramírez de Lucena's 1497 book (the oldest surviving printed book on chess), and the Göttingen manuscript (authorship and exact date of the manuscript are unknown). He was born in Zafra near Badajoz, and he studied and lived in Salamanca. In 1560 he won
Sicilian Defence does little for Black's development, unlike moves such as 1...e5, 1...g6, or 1...Nc6, which either develop a minor piece or prepare to do so. In many variations of the Sicilian, Black makes a number of further pawn moves in the opening (for example, ...d6, ...e6, ...a6, and ...b5). Consequently, White often obtains a substantial lead in development and dangerous attacking chances. Meanwhile, advancing a pawn has given Black a there and provides a basis for future operations on that flank. Often, Black's c5-pawn is traded for White's d4-pawn in the early stages of the game, granting Black a central pawn