Chess opening are so complex and theoretical that amateur players will have trouble understanding them. An example is the Perenyi Attack of the Sicilian Defense (see diagram) which yields an immensely complicated and tactical position that even strong players have difficulty handling, and that is beyond the comprehension of most amateurs. 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 does Pedro Damiano (1512), and Ruy López de
Harold Lopez Nussa Harold Lopez Nussa Harold López-Nussa Torres is a Cuban jazz pianist. He lives in Havana's Vedado neighborhood in Cuba and has French ancestry on his grandmother's side. López-Nussa gave a concert in the 2006 Montreux Jazz Festival and recorded with Claude Nobs support, "Sobre el Atelier" in a Swiss studio. López-Nussa was born into a musical family in Havana on July 13, 1983. His father, Ruy López-Nussa Lekszycki, and his younger brother Ruy Adrián López-Nussa are drummers and percussionist. His uncle Ernán López-Nussa is a wellknown jazz pianist. His mother, Mayra Torres, was a piano teacher. He started on piano