Chess is a two-player strategy board game played on a chessboard, a checkered gameboard with 64 squares arranged in an 8×8 grid.
In chess, connected pawns are two or more pawns of the same color on adjacent files, as distinct from isolated pawns.
In chess, doubled pawns are two pawns of the same color residing on the same file.
In chess, a half-open file (or semi-open file) is a with only pawns of one color.
In chess, an isolated pawn is a pawn that has no friendly pawn on an adjacent.
The knight (♘ ♞) is a piece in the game of chess, representing a knight (armored cavalry).
The pawn (♙,♟) is the most numerous piece in the game of chess, and in most circumstances, also the weakest.
In chess, the pawn structure (sometimes known as the pawn skeleton) is the configuration of pawns on the chessboard.
The queen (♕,♛) is the most powerful piece in the game of chess, able to move any number of squares vertically, horizontally or diagonally.
A rook (♖,♜) is a piece in the strategy board game of chess.
The Sicilian Defence is a chess opening that begins with the following moves: The Sicilian is the most popular and best-scoring response to White's first move 1.e4.