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 word has come to us directly from Catalan (as opposed to Provençal or Spanish), the following are likely to be such examples: By the time the crowns of Castille and Aragon were united in the late 15th century, the Italianisation of written Sicilian in the parliamentary and court records had commenced. By 1543 this process was virtually complete, with the Tuscan dialect of Italian becoming the "lingua franca" of the Italian peninsula and supplanting written Sicilian. Spanish rule had hastened this process in two important ways: Spanish rule lasted over three centuries (not counting the Aragonese and Bourbon periods on