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There are other symbols used by various chess engines and publications, such as Chess Informant and Encyclopaedia of Chess Openings, when annotating moves or describing positions. [8] Many of the symbols now have Unicode encodings, but quite a few still require a special chess font with appropriated characters.
This article covers computer software designed to solve, or assist people in creating or solving, chess problems – puzzles in which pieces are laid out as in a game of chess, and may at times be based upon real games of chess that have been played and recorded, but whose aim is to challenge the problemist to find a solution to the posed situation, within the rules of chess, rather than to ...
Chess puzzles can also be regular positions from actual games, usually meant as tactical training positions. They can range from a simple "Mate in one" combination to a complex attack on the enemy king. Solving tactical chess puzzles is a very common chess teaching technique. They are helpful in pattern recognition.
Sometimes a given check is part of a chess tactic such as a fork, a skewer, or a discovered attack on another piece. In some cases, a check can be used to defend against such tactics. There are also a few more special types of check: Discovered check. A discovered check is similar to any other type of discovered attack except that it is a ...
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]
Two major pieces (queens or rooks) can easily force checkmate on the edge of the board using a technique known as the ladder checkmate. [17] The process is to put the two pieces on adjacent ranks or files and force the king to the side of the board by using one piece to check the king and the other to cut it off from going up the board. [18]
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A cross-check occurs from time to time in games. It is an essential tactic in winning endgames such as two queens versus one queen, or queen and pawn versus queen, where it is used to stop a series of checks from the opponent and force the exchange of queens.