Chess of the position. Weaknesses in the pawn structure, such as isolated, doubled, or backward pawns and , once created, are often permanent. Care must therefore be taken to avoid these weaknesses unless they are compensated by another valuable asset (for example, by the possibility of developing an attack). A chess opening is the group of initial moves of a game (the "opening moves"). Recognized sequences of opening moves are referred to as "openings" and have been given names such as the Ruy Lopez or Sicilian Defense. They are catalogued in reference works such as the "Encyclopaedia of Chess Openings". There
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