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In chess, an X-ray or X-ray attack is a tactic where a piece indirectly controls a square from the other side of an intervening piece. Generally, a piece performing an X-ray either: effects a skewer, [1] [2] [3] indirectly attacks an enemy piece through another piece or pieces, or
A piece in a chess problem that is legally placed and could only have been created through promotion. It does not include pieces promoted after the initial problem position. orthochess Synonym for orthodox chess. [5] orthodox chess Chess according to FIDE's The Official Laws of Chess; [6] see Rules of chess.
On certain Internet chess servers, such as Chess.com and Lichess, this kind of move is marked as an "inaccuracy", denoting a weak move, appearing more regularly than with most annotators. A sacrifice leading to a dangerous attack that the opponent should be able to defend against if they play well may receive a "?!".
A discovered attack is a move that allows an attack by another piece. A piece is moved away so as to allow the attack of a friendly bishop, rook or queen on an enemy piece. If the attacked piece is the king, the situation is referred to as a discovered check. Discovered attacks are powerful since the moved piece may be able to pose a second threat.
In chess, a clearance sacrifice is a tactical motif which involves a square on the chessboard being vacated to open up lines of attack. The tactic may also result in the substitution of a piece hindering the attack by a piece useful to the attack.
The Barcza System is a chess opening system played by White, comprising the moves Nf3, g3, Bg2 and 0-0, regarded as non-committal moves whilst Black exposes their intention. [1] It is named after the Hungarian grandmaster Gedeon Barcza who employed the opening on many occasions throughout his career.
The Napoleon Opening is named after the French general and emperor Napoleon Bonaparte, who had a deep love of chess but was said to be a mediocre player. [1] The name came into use after mid-nineteenth century publications reported [2] that he played this opening in an 1809 game [3] that he lost to The Turk, a fake chess automaton operated at the time by Johann Allgaier.
Chess initial position. The game of chess is commonly divided into three phases: the opening, middlegame, and endgame. [1] There is a large body of theory regarding how the game should be played in each of these phases, especially the opening and endgame.