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Undermining (also known as removal of the guard, or removing the defender) is a chess tactic in which a defensive piece is captured, leaving one of the opponent's pieces undefended or under-defended. The opponent has the unpalatable choice of recapturing or saving the undefended piece.
A piece leaves a square, and then later in the solution returns to it by a circuitous route (for example, a rook moves e3–g3–g5–e5–e3). Cf. switchback, in which the route taken to the original square is direct. royal piece In the context of chess variants, a piece subject to check and checkmate, as the king is in orthodox chess. [7]
In a game of chess, the pawn structure (sometimes known as the pawn skeleton) is the configuration of pawns on the chessboard.Because pawns are the least mobile of the chess pieces, the pawn structure is relatively static and thus plays a large role in determining the strategic character of the position.
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 "?!".
Apocalypse is a chess variant invented by C. S. Elliott in 1976. [1] [2] Each player starts with two horsemen and five footmen on a 5×5 board. The two sides make their moves simultaneously. The game was featured in Issue 53 of Games & Puzzles magazine. The name Apocalypse is a reference to the Four Horsemen of the Apocalypse.
In chess, an isolated pawn is a pawn that has no friendly pawn on an adjacent file. Isolated pawns are usually a weakness because they cannot be protected by other pawns. The square in front of the pawn may become a good outpost for the opponent to anchor pieces.
The Encyclopaedia of Chess Openings classifies the King's Indian Defence under the codes E60 through E99. The King's Indian is a hypermodern opening, where Black deliberately allows White control of the centre with pawns, with the view to subsequently challenge it.
It can control up to 12 squares on an 8×8 board as opposed to the rook's 14. It is stronger than the rook in the opening and middlegame, as it can more easily maneuver around pieces than the rook, but the rook is stronger in the endgame. While king and rook vs. king can force checkmate, king and nightrider vs. king cannot checkmate at all.