A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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Questions relating to the first few moves in a game
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any machine or computer program that plays chess.
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Questions related to determining the Truth behind positions. This includes who is winning, what the next move should be, and what happens when a certain move is played.
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Questions relating to the rules of chess
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Questions relating to strategical play and long term planning in chess
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Questions related to learning how to play chess and improving your chess skills. This can also be used for questions concerning "learning" chess engines.
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the part of the game when there are only a few pieces left on the board. Usually play revolves around one or both players trying to promote a pawn. Alternatives are the opening an…
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Questions about chess-related software, but not including chess-playing engines; there's a more specific tag for those questions, the [engines] tag.
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Theory commonly refers to the erudite study and the philosophy behind the moves in chess (like opening or endgame theory) but this tag can also be used for questions about the game theoretic study of …
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the concrete maneuvers (e.g. forking two pieces with a knight, pinning a piece to the opponent's king, or unleashing a discovered check) that chess players use and combine in order to achi…
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A series of chess games between a number of player, who compete for a set of prizes. Chess tournaments are of different formats and categories, and they can be open or by invitation only
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Questions relating to checkmating.
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A number that approximates a player's skill. The actual meaning of the number depends upon the issuing organization. FIDE ratings are used as the international standard for over the board chess
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Questions about variants of normal chess including bughouse, Chess960 (Fischer Random), atomic chess, and antichess.
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for questions relating to the history of chess and chess organizations, whose origins trace to the ancient Indian game of Chaturanga.
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a strong open-source chess engine.
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Questions relating to playing chess on the internet, as opposed to over-the-board chess.
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Questions related to all aspects of writing software related to chess.
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Questions about FIDE, the international governing body of chess.
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A style of play emphasizing capture of strategic squares and prophylactic moves.
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A problem in which a tactical or positional solution is required, like 'White move and gives mate in two'.
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the opening given by the moves 1. e4 c5, and it is one of the most popular replies to white's 1. e4.
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Questions concerning chess literature.
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Questions relating to drawing in chess
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Questions relating to chess training
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Questions of interest to or relating to new players.
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A set of chess games, distributed as a stand-alone product or as part of a bundle of chess software. For endgame databases, use the [tablebases] tag instead.
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ABOUT the Elo rating system not when it mentions Elo
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Questions relating to the Pawn
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refers to chess games played by computers. If you want to ask a question about those games, use this tag. Otherwise, use the tag [engines].
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Questions about game statistics, e.g. the winning percentage of a "line," the probability of some event occurring in a game, or player statistics.
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Questions related to cognitive, motivational and other psychological aspects of chess, both during and before/after games.
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PGN stands for Portable Game Notation. This is a file format for storing chess games (both the moves and various header data such as players' names) that is easily read by people while also easy for …
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A chess problem consists of a board position and a task. Most often the problem asks to find a line of play that mates black in a given number of moves, or to find a combination that guarantees a winn…
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For all questions related to the World Chess Championship: its holders, contestants, history, etc.
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Questions relating to castling