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
Sicilian language either side) and had a significant influence on the Sicilian vocabulary. The following words are of Spanish derivation: Since the Italian Unification (the Risorgimento of 1860–1861), the Sicilian language has been significantly influenced by (Tuscan) Italian. During the Fascist period it became obligatory that Italian be taught and spoken in all schools, whereas up to that point, Sicilian had been used extensively in schools. This process has quickened since World War II due to improving educational standards and the impact of mass media, such that increasingly, even within the family home, Sicilian is not necessarily the language of choice. The