| Active piece | A Chess piece that is able to control or move to several squares over the board.... |
| Advantage | A superiority of position, based on the quantity and quality of the pieces.... |
| Algebraic notation | A combination of letters and numbers (a-h and 1-8) which refers to the 64 squares of the chess board.... |
| Analysis | Detailed study of a series of moves.... |
| Arbiter | Chess has Arbiters for the enforcement of the rules.... |
| Attack | An aggressive action during a game to threaten or to capture a piece or the King.... |
| Back rank | White's first and Black's eighth rank on the board.... |
| Back rank mate | A checkmate made along the back rank where the opponent's King is blocked in by its own Pawns.... |
| Battery | Doubling Rooks on a file or a Queen and a Bishop on a diagonal.... |
| Bishop pair | Two Bishops. Their value is enhanced as together they can attack a piece on any color square. ... |
| Blindfold Chess | Games played without seeing the board. ... |
| Blitz Chess | Rapid or lightning Chess games usually clocked in five or ten minutes.... |
| Blunder | A very bad move that loses material or initiative.... |
| Breakthrough | An infiltration to the opponent's position.... |
| Caissa | Goddess of Chess. ... |
| Calculate | To precisely work out a series of moves considering potential replies.... |
| Capture | The movement that captures an enemy piece in the process. The captured enemy piece is taken from the board and removed from the game. ... |
| Castling | From its initial position the King moves two squares to either side, and the Rook toward which it moves is placed on the square the King passed over. ... |
| Center | The four squares in the geometrical center of the board. ... |
| Check | It refers to a King that is being attacked by an enemy piece. ... |
