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Spanish priest and chess player

Rodrigo "Ruy" López de Segura (c. 1530 – c. 1580) was a Spanish chess player, author, and Catholic priest whose 1561 treatise Libro de la invención liberal y Arte del juego del Axedrez was one of the first books about modern chess in Europe. He made great contributions to chess opening theory, including in the King's Gambit and the Ruy López (or Spanish) opening that bears his name. López was also the strongest player in Spain for about 20 years.

López was a native of Segura de León, a town in Extremadura, Spain. In 1559, while living in Zafra, López was called to Rome by Pope Pius IV on ecclesiastical business. During his stay in Rome, López played chess with the locals. He apparently acquitted himself well, although the only account of these games is given in a single sentence by López himself. One of those players was Il Puttino, an epithet for a young Leonardo di Bona. López also learned the term gambit from the Italian players. In Italy López encountered Pedro Damiano's treatise on chess, Questo libro e da imparare giocare a scachi et de li partiti, but did not find much value in it. This may have inspired López to write his own book, Libro de la Invencion liberal y Arte del juego del Axedrez, which was published in 1561. López was the strongest player in Spain for nearly twenty years; his nearest rivals were Alfonso Ceron (of Granada) and Medrano. López and Ceron played before King Philip II of Spain, impressing him enough for López to earn a benefice and a golden chain displaying a rook. López was also esteemed for his ability at blindfold chess. Alessandro Salvio writes that López travelled to Rome again in 1572. It is more probable, however, that López visited Rome only once (in 1559) and that Salvio's chronology is incorrect. Around the year 1574, López was still at the royal court in Spain when di Bona, then Paolo Boi, arrived on their tours of Europe. Their meetings – which also included Ceron – are sometimes considered the first international chess tournament. Boi and a much improved di Bona defeated López and Ceron in Madrid, in the presence of Philip II. López was again able to best Ceron. The years of López's birth and death can be estimated only very approximately; a lifespan of ca. 1530 1580 is commonly given without evidence. He was likely born before 1534, and lived until at least the 1574 contest.

Ruy López's contribution to chess was mainly to its opening theory; Peter J. Monté has described him as the "father of opening theory". His analysis of the King's Gambit in particular went well beyond earlier writing such as Damiano's. He also was the strongest player in Spain, and possibly Italy, for about twenty years. As Andrew Soltis describes: "At that time, the best players of modern rules chess lived in Italy and Iberia. López is believed to have easily beaten the most skilled Italians. He may deserve the title of world champion, but that title did not exist until the late nineteenth century." López's reputation suffered from the writings of the Modenese Masters. Ponziani described López as unfruitful, unmethodical, and having made little advance on Damiano. H. J. R Murray argues, however, that the Masters' criticism of López is unfair and likely stems from his play's resemblance to Philidor's, who was their school's great rival:

text=Living before the great rival schools of chess which divided the players of the 18th and early 19th centuries had arisen, López yet belongs essentially to that school of chess which we are accustomed to associate with the name of Philidor. In his analysis, and especially in the games in his second book, we may trace the genesis of that theory of Pawn play which Philidor reduced to a system two centuries later.|author=H. J. R Murray

Ruy López's surviving treatise, which is fully titled Libro de la Invencion liberal y Arte del juego del Axedrez, por Ruy López de Sigura, clerigo, vezino de la villago Cafra. Digirida al muy Illustre Señor Don Garcia de Toledo, ayo y mayordomo del serenissimo principe Don Carlos nuestro Señor., was published in 1561. López divided his book into four parts ("books"). He first presents several mythological origins of the game, and discusses its benefits, rules, and strategies while interspersing a number of quotes (in Latin) from classical authors. The second part focuses on openings and is López's legacy as "the father of opening theory." Third comes a hostile appraisal of Damiano's opening analysis. López's final chapters are devoted to odds chess, where he again criticizes Damiano's approaches to these games. In this work López presents sixty six games, of which twenty four were taken from Damiano's 1512 book. According to J. H. Sarartt, López's games are of a lower quality than those in Damiano's work. He admits that they might nevertheless be more instructive, since López gives a larger number of variations. Other authors have given varying opinions about the quality of López's analysis. López only rarely presented variations that ended in checkmate. Instead he concluded lines with comments such as how black must lose his queen, or that white has a very good game.