Chess Glossary
A curated glossary of chess terms every player from beginner to competitive should know. Each term includes a clear definition, a practical usage example, and the Grandmaster T1-T5 tier context of when players typically learn or drill it.
21 termsRules and Basics
6Castling
Castling is a special move where the king and rook move simultaneously in one tempo.
Read term →Check
Check is the state where the king is attacked by one or more opponent pieces and must be defended on the next move.
Read term →Checkmate
Checkmate is the state where the king is in check with no escape: the king is trapped, no piece can block, and no attacker can be captured to remove the check.
Read term →En Passant
En passant is a special rule where a pawn may capture an opponent pawn that just advanced two squares from its starting position, as if it only advanced one square.
Read term →Promotion
Promotion is the rule where a pawn reaching the farthest rank (rank 8 for white, rank 1 for black) is automatically replaced with a piece of the player's choice: queen, rook, bishop, or knight.
Read term →Stalemate
Stalemate is the state where a player must move but has no legal moves available, while their king is NOT in check.
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Tactical Motifs
5Discovered Attack
A discovered attack is a tactic where the moving piece unblocks an attack line from another piece behind it.
Read term →Fork
A fork is a tactic where one piece attacks two or more opponent piece targets simultaneously in a single move.
Read term →Pin
A pin is a tactic where an opponent piece cannot move because doing so would expose a more valuable piece behind it.
Read term →Skewer
A skewer is a tactic where a valuable piece is attacked and forced to move, exposing a less valuable piece behind it as the next target.
Read term →Zwischenzug
Zwischenzug is an in-between move inserted in the middle of an expected trade or attack sequence, usually a check, queen threat, or other tactical strike.
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Positional and Endgame Concepts
8Initiative
Initiative is the condition where you have bigger threats than the opponent, so the opponent must be reactive while you keep dictating the flow of the game.
Read term →Isolated Pawn
An isolated pawn is a pawn with no friendly pawns on adjacent files, so it cannot be supported or defended by other pawns.
Read term →Opposition
Opposition is an endgame situation where two kings face each other with an odd distance (1, 3, or 5 squares) on the same file, rank, or diagonal.
Read term →Outpost
An outpost is a square on the opponent side (rank 4-6 from your side) that: (1) is protected by your own pawn, (2) cannot be attacked by opponent pawns because no opponent pawn exists on adjacent files.
Read term →Passed Pawn
A passed pawn is a pawn with no opponent pawn on its own file or adjacent files in front of it, so no opponent pawn can intercept its march to the promotion rank.
Read term →Prophylaxis
Prophylaxis is a strategic technique where you anticipate the opponent plan and prevent it before they can execute.
Read term →Tempo
Tempo is a unit of time (one half-move) in chess.
Read term →Zugzwang
Zugzwang is a state where the player to move MUST move, and every legal move worsens their position.
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General Strategy
2Gambit
A gambit is an opening where a player deliberately sacrifices 1-2 pawns (sometimes a piece) early to gain faster development, open lines to the opponent king, or center control.
Read term →Sacrifice
A sacrifice is the deliberate act of giving material (pawn or piece) to the opponent to gain other advantages: mating attack, positional advantage, or dynamic-positional gain.
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