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.

For questions on, about, or relating to the art of composing chess problems and studies.
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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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Correspondence chess was traditionally played using postal mail, nowadays it's more common to use dedicated servers. Time limits are usually measured in days.
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"Active maneuvering by the player in an inferior or defensive position" (from Wikipedia)
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For questions about the Chess Query Language, which lets you find positions or moves satisfying certain criteria within a large database of chess games or studies.
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Relating to the chess variant Crazyhouse
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Questions about the Damiano Defense (ECO code C40), which can be reached using the moves 1.e4 e5 2.Nf3 f6.
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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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Neither player can checkmate the opponent’s king with any series of legal moves.
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Questions dealing with how to defend against attack, and how to choose moves that are defensive in nature. Note 'defensive' does not mean passive.
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Relating to the analysis depth of a chess engine
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The process of activating and coordinating your pieces in the opening of the game
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Questions related to chess diagrams.
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Questions related to the Chinese Grandmaster Ding Liren.
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A discovered check is a move where one piece moves, while not checking the opponent’s king itself, to uncover a check from another piece.
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A double check is a move in which one moves and gives check, while also revealing a check from a piece behind it. A double check can also be created through promotion and en passant.
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Doubled pawns are two pawns of the same colour on the same file.
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This is the name for the move in which a pawn moves two spaces, which is only available on its home square.
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Questions that concern downloading chess games.
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Questions relating to drawing in chess
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The Dutch Defence is a chess opening characterised by the moves 1.d4 f5.
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Every chess opening is associated with an ECO (Encyclopedia of Chess Openings) code.
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Elementary checkmates are the basic techniques for how to force checkmate in certain endgames with overwhelming material advantage and very few pieces left on the board. These endgames usually include…
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Use when the question is ABOUT the Elo rating system not when it mentions Elo
Questions relating to the final stages of a game of chess, when only few pieces are left on the board.
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Questions relating to chess engines: any computer program that is able to play/analyze chess positions.
A common attacking setup by white distinguished by 6.Be3 in the Sicilian Najdorf: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6
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The English Opening is the chess opening characterized by white's opening move 1. c4.
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En passant is a rule allowing a pawn to make a special-case capture.
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