A check is a condition in chess, shogi, and xiangqi that occurs when a player's king (or general in xiangqi) is under threat of on their opponent's next turn.
Checkmate (often shortened to mate) is a game position in chess and other chess-like games in which a player's king is in check (threatened with) and there is no way to remove the threat.
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, a tactic refers to a sequence of moves that limits the opponent's options and may result in tangible gain.
In chess, a double check is a check delivered by two pieces simultaneously.
En passant (in passing) is a move in chess.
The French Defence is a chess opening characterised by the moves: This is most commonly followed by 2.d4 d5, with Black intending...c5 at a later stage, attacking White's and gaining on the.
In chess and other chess-like games, tempo is a "turn" or single move.