Major changes in the rules of chess in the late fifteenth century increased the speed of the game, consequently emphasizing the importance of opening study. Thus, early chess books, such as the 1497 text of Luis Ramirez de Lucena, present opening analysis, as do Pedro Damiano (1512), and Ruy López de Segura (1561). Ruy Lopez's disagreement with Damiano regarding the merits of 2...Nc6 led to 3.Bb5 (after 1.e4 e5 2.Nf3 Nc6) being named for him as the Ruy Lopez or "Spanish Opening". Opening theory was studied more scientifically from the 1840s on, and many opening variations were discovered and named in this period and later. Opening nomenclature developed haphazardly, and most names are historical accidents not based on systematic principles. In the early 1930s, the nascent FIDE embarked on a project to standardize opening nomenclature, culminating in the publication of a short booklet in 1933, but this had little impact.