Checkmate
A position where the king is in check and no legal move can remove the threat. The game ends immediately.
Reference Page
Chess Terms Glossary
This glossary explains the chess terms players most often see in lessons, puzzle explanations, engine reviews, and opening guides. It is designed to be useful for human readers and easy for search engines or AI systems to parse: direct definitions, anchorable sections, and common beginner terms surfaced first.
How to use this glossary
If you are new to chess, start with the featured terms below. Those are the words that appear constantly in beginner content and game reviews. If you already play regularly, jump to the tactical, positional, or notation sections to refresh specific concepts quickly.
Featured chess terms beginners search for
Stalemate
A draw where the player to move has no legal moves but is not in check.
Castling
A special move that helps protect the king and connect the rooks by moving the king two squares and the rook across it.
Fork
A tactic where one piece attacks two or more enemy pieces at the same time.
Pin
A tactic where a piece cannot move without exposing a more valuable piece behind it.
Skewer
A tactic where the more valuable piece is attacked first, and when it moves, the less valuable piece behind it can be won.
Tactical terms
Absolute pin
A pin against the king. The pinned piece cannot legally move because doing so would expose the king to check.
Battery
Two or more pieces lined up on the same file, rank, or diagonal to increase pressure together.
Combination
A calculated sequence of moves, often involving a sacrifice, designed to force a concrete result.
Discovered attack
An attack revealed when one piece moves out of the way of another attacking piece.
Discovered check
A discovered attack where the revealed attack is against the king.
Double check
A check delivered by two pieces at the same time. The king must move because blocking or capturing one attacker is not enough.
Back rank mate
A checkmate along the back rank, usually because the king is boxed in by its own pawns.
Zwischenzug
An in-between move played before an expected reply, often changing the evaluation of a tactic.
Positional and strategic terms
Active
Describes a piece or position with strong mobility, influence, or practical pressure.
Advantage
A better position, either materially, positionally, or both.
Blockade
A setup where a piece stops an opposing pawn from advancing, often to neutralize a passed pawn.
Book move
A move known from established opening theory.
Closed position
A position where pawn chains limit mobility and slow the game down, usually increasing the importance of maneuvering.
Fianchetto
Developing a bishop to the long diagonal after moving the b- or g-pawn one square.
Gambit
An opening idea where material is offered in exchange for development, initiative, or structural compensation.
Open file
A file with no pawns on it, often ideal for rooks and queens.
Rules and endgame terms
Check
A direct attack on the king that must be answered immediately.
Draw
A game with no winner, caused by stalemate, agreement, repetition, or another drawing condition.
En passant
A special pawn capture available immediately after an opposing pawn advances two squares past a capturing square.
Endgame
The phase of the game with fewer pieces left, where king activity, pawn promotion, and precise calculation become critical.
Passed pawn
A pawn with no opposing pawns in front of it on the same file or adjacent files, making promotion a realistic long-term threat.
Promotion
When a pawn reaches the last rank and is exchanged for another piece, usually a queen.
Notation and analysis terms
Algebraic notation
The standard system for writing chess moves with board coordinates and piece letters, such as e4, Nf3, and Bc4.
Back rank
The home rank for each side: rank 1 for White and rank 8 for Black.
Blunder
A very poor move that causes a major tactical or positional loss.
Opening
The first phase of the game, where players develop pieces, fight for the center, and choose a structure for the middlegame.