algebraic chess notation: A standard method of chess notation for all chess organizations that uses letters and numbers for the files and ranks, respectively.
bishop: A chess piece that can move any number of vacant squares in any direction diagonally.
blitz chess: A fast chess game that has a time control of five minutes per side. If the clock runs out before a player has checkmated his opponent, he loses.
bullet chess: A fast chess game with a time control of one minute per side.
castling: A chess move in which a king chess piece moves two squares towards a rook and the rook moves immediately to the far side of the king. It is only permitted under certain conditions.
check: The situation in which a king is under immediate attack by the opponent’s pieces. A player under check must move or block check to continue playing the game.
checkmate: A winning condition in which the opponent’s king is in check and there is no way to remove the king out of it.
chess notation: A term for several systems that have developed to record either the moves made during a game of chess or the position of the pieces on a chess board.
discovered attack: An attack revealed when one piece moves out of the way of another. The revealed piece is the one that is attacking.
double check: A check that is delivered by two pieces at the same time.
draw: A possible outcome of a chess game in which there is a tie with no winner and no loser.
draw by agreement: The outcome of a chess game in which both players agree to a draw or a tie.
endgame: The phase of the game after the opening and middlegame when most of the pieces are gone and kings start to take an active part in the struggle.
en passant: A chess move in which a player moves a pawn two squares forward from its starting position and an opposing pawn could have captured it as if it had only moved one square forward.