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 related to (world) records in chess, e.g. the longest game (in moves or in duration), highest obtained rating, longest mate in n puzzle, etc.
The evaluation of a given position
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 …
Questions relating to castling
Questions concerning the overall configuration of pawns in a game, e.g. what pawn structure features should be sought or avoided, when to alter the structure, how to work with one's pieces in a given …
Questions relating to the Knight
For all questions related to the World Chess Championship: its holders, contestants, history, etc.
Notation refers to any formalized method of recording chess games so they can be replayed and shared later. Common notations include algebraic, figurine algebraic, descriptive, and the digital PGN fo…
A gambit is an opening where one player sacrifices material - usually a pawn, but sometimes multiple pawns or even a piece - in order to gain some positional advantage, e.g. a lead in development or m…
Questions related to techniques for promoting pawns, or the promotion itself.
Questions concerning the mathematics of the game of chess, or chess-related mathematical pursuits.
Questions relating to check
For questions about various time controls. See also the tag time-management.
A semi-open defense with a well-earned reputation for producing solid positions that are sometimes a bit stodgy. The usual move order is 1. e4 c6 2. d4 d5.
Questions relating to the Bishop.
Questions relating to the Queen
A blunder is a move that is a mistake that leads to losing material (e.g. a pawn or a piece) more or less without any compensation.
Questions relating to well-known chess players.
Tablebases are databases that contain complete, exhaustively calculated moves and variations for a given collection of chess positions. E.g. the Nalimov tablebases contain full solutions for all endga…
The French Defense begins with 1. e4 e6 2. d4 d5. Black plans to play a solid setup and contest white's center with moves like c5 and Nc6. The biggest drawback to the French Defense is that black's …
Universal Chess Interface (UCI) is the interface protocol used by most of the major chess engines.
A chess game is said to end in stalemate when the player to move has no legal move and his king is not in check.
Questions regarding the written rules, or the unwritten customs, that concern proper behavior in the world of chess.
1. e4 is White's most common first move (except at the top grandmaster level). It tends to produce open games.
Games played by demonstrably skilled players such as FIDE IMs and GMs, or those of similar strength pre-FIDE.
Question relating to sacrificing material in chess
Certain games are famous and well known among chess players, e.g. the Immortal game.
Chessbase is a popular chess software for saving games, searching game databases and analysing games using a chess engine.
Questions relating to the King
Questions relating to learning about chess or analyzing positions on the chessboard. Not to be confused with the concept of an "endgame study", a kind of chess puzzle which doesn't have it's own tag y…
The King's Indian Defense (or "KID") is a semi-closed opening starting with 1. d4 Nf6 2. c4 g6 3. Nc3 d6. Black develops with Bg7 and O-O and then either e5 or c5 depending on white's setup. The KID…
The Ruy Lopez (or Spanish Game) is the chess opening which begins with the moves 1. e4 e5 2. Nf3 Nc6 3. Bb5.
1. d4 is one of White's two most common first moves. It tends to produce closed games.
Retrograde analysis is the method of deducing information by working backwards from a given position or outcome. This information can be about past positions of the same game, or may contain forward c…
A concept in chess that involves targeting one of the opponent's pieces or a construct of them. For example, one can attack the opponent's king or pawn structure.
For questions about the lichess.org website. Please note that we are NOT Lichess support; some questions are simply not answerable by us.