Glossary of Chess Terms

  • Kid Chess Glossary of Terms

    Active Piece🔗

    Active Piece

    A piece that has free range of the board. White bishop on c4 is active; black
    bishop on f8 is not.



    The freedom of movement, or mobility, that your pieces hopefully have.
    In this position white’s bishop and knight have a lot of activity because they
    have many squares they can move to. On the other hand, black’s knight and
    bishop are very inactive since they can go virtually nowhere.



    The process of going after your opponent’s king or vulnerability to win the
    In this position black attacks white queen on d1 and white rook on h8 attacks
    the black king.

    Back Rank Mate🔗

    Back Rank Mate

    A checkmate that occurs when your opponent’s king is trapped behind a wall
    (usually a wall of his own pawns) on the back rank, and your queen or rook
    attacks on the back rank.
    In this position 1. Qh8# is back rank checkmate. But 1. Qa8+?? would be a
    terrible blunder, because of 1… Bxa8.

    Backward Pawn🔗

    Backward Pawn

    A pawn that has lagged behind and cannot be protected by other pawns. Usually
    considered a weakness.



    Two long range pieces (such as a queen and bishop) lined up and pointed in the
    same direction along a rank, file, or diagonal.

    Bishop Pair🔗

    Bishop Pair

    Because one bishop can cover the dark and the other the light squares they work
    well together as a pair.


    Placing a usually lesser-valued piece in front of a more-valuable one to block
    its capture by your opponent. Typically used more than not to get your king out
    of check.



    The act of placing a piece in the path of a “passed pawn” to keep it from
    Black king successfully blocks both white connected passed pawns. White rook
    blocks only one pawn (b2), the other one will promote.


    A really bad move.



    Castling consists of moving the king two squares towards a rook on the player’s
    first rank, then moving the rook to the square that the king crossed. Castling
    may be done only if the king has never moved, the rook involved has never
    moved, the squares between the king and the rook involved are unoccupied, the
    king is not in check, and the king does not cross over or end on a square
    attacked by an enemy piece.



    The squares d4, e4, d5, and e5. (Diagram) Basic center (4 green squares) broader
    center (16 yellow squares)


    To place pieces and pawns so they attack the center.



    To directly attack or threaten to capture your opponent’s king. Your opponent
    must then immediately drop whatever he was doing to fix the problem.
    Black’s king is in check now. To save the king black can either Capture the
    checking piece Bxe8 (the best option), Block the check Nf8, or Run away with



    To “check” your opponent’s king with no way for it to get out of check. That is,
    they cannot capture the attacking piece, they cannot block the attack with
    another of their own pieces, and they cannot move the king out of check.
    “Checkmate” ends the game.
    Here, black is checkmated. There is no way to Capture the white rook on e8,
    Block the check or Run away with the king. As the king is trapped behind a wall
    of it’s own pawns, this is in fact also called a Back Rank Checkmate.

    Closed Game🔗

    A position with few, if any, pawn trades where pieces are somewhat restricted in
    their movement.

    Colle (Opening System)🔗


    Opening piece formation for white arising out of moving the queen pawn instead
    of the king pawn.



    Series of tactical moves designed to improve your overall position, usually
    involving surprise and maybe even a piece “sacrifice”.
    In this position Bb5! starts a short (2-move) combination for white. The black
    queen is pinned, so black captures the unprotected bishop Qxb5. Now white forks
    black king, queen and rook with Nxc7+.

    Connected Passed Pawns🔗

    Connected Passed Pawns

    Two or more passed pawns of the same color that are on files next to each other.



    Development: The process of bringing your pieces into play and getting them
    active in the opening to get ready for the middle game.
    In this position white has developed all of their minor pieces and castled the
    king. Black has been moving their pawns and rooks. White has a big advantage

    Discovered Attack🔗

    Discovered Attack

    A chess tactic, when a piece moves to reveal an attack from previously hidden
    long range piece (i.e. bishop, rook or queen).
    In this position white just moved the pawn from c3 to c4, attacking the knight
    and revealing a discovered attack on the black rook.

    Discovered Check🔗

    Discovered Check

    A special kind of discovered attack, when the hidden long range piece checks the
    In this position, white plays 1. Rd4+, exposing the king to check from the
    bishop on d3 and attacking the black queen at the same time. Black must get
    their king out of check and white takes the queen next move. Note that 1. Re8+
    would not work as black would simply respond 1…Qxd3 capturing the checking

    Double Attack🔗

    Double Attack

    A move that attacks two things at once.
    In this diagram the knight on e6 attacks both the black queen and king.

    Double Check🔗

    Double Check

    A special kind of discovered attack/discovered check, when both pieces attack
    the opponent’s king at once. Double checks are super-powerful, because they
    cannot be stopped by capturing or blocking either piece.
    In this position white has just moved the bishop from d4 to f6, discovering an
    attack from the queen and moving the bishop to a square where it is also
    checking the king.

    Doubled Pawns🔗

    Doubled Pawns

    Tend to be a weakness.

    Dragon (Opening System)🔗


    An opening piece formation for black based on the Sicilian Defense.


    End of the game where neither side wins and neither side loses.

    Dual Purpose Move🔗

    A move that accomplishes two ore more things.

    En Passant🔗

    En Passant

    French term (meaning “in passing”) for a special capture move between two pawns.
    A pawn which on its first move advances two squares and passes an enemy pawn on
    an adjacent file that has advanced to its 5th rank, may be captured by that
    enemy pawn as if the first pawn had moved only one square.


    Late in the game when there are relatively few pieces left on the board.


    A trade or swap of pieces.

    The Exchange🔗

    Expressing the difference in piece value between a rook and your opponent’s
    bishop or knight. Gaining a rook for your own bishop or knight is called
    “winning the exchange”.



    Pronounced “fee-an-KETT-toe”.When you develop your bishops to b2, g2, b7, or
    g7. A necessary part of building a “house”.



    A row of eight vertical squares.

    Forced Move🔗

    A move that is the only one to not result in a serious disadvantage for the
    moving player.



    Situation when a piece or pawn attacks two or more of your opponent’s pieces at
    the same time.



    A pawn sacrifice made in the opening to gain the initiative or advantage in



    An unprotected piece or pawn.
    In this position white knight on d5 is protected by the pawn. However the pawn
    is hanging because it is not protected by anything.



    A square that cannot be defended by pawns.



    The kingside formation of a centrally-developed knight, fianchettoed bishop,
    and castled king.

    In-between Move🔗

    In-between Move

    (Also known as “zwischenzug” or “intermezzo”.) A tactic in which a player under
    threat, instead of directly countering, introduces an even more devastating
    threat. The tactic often involves a new attack against the opponent’s queen or
    king. The opponent then may be forced to address the new threat, abandoning the
    earlier attack.
    In this position it is white’s move and they will play the in-between-move 1.Qxf7+.
    This forces black to capture the bishop with 1…Kxf7, and white will follow with
    2.Qxd8 winning the black queen.

    In Your Face Checkmate🔗

    In Your Face Checkmate

    A checkmate when the checkmating piece (usually a queen), supported by another
    piece is next to the opponent king.


    When you have an advantage in time and space, while your opponent is on the

    Insufficient Mating Material🔗

    Insufficient Mating Material

    A type of draw, when neither side can ever checkmate the opponent. King vs King,
    King & Knight vs King, King & Bishop vs King, and even King & two Knights vs
    King are insufficient.

    Isolated Pawn🔗

    Isolated Pawn

    A pawn with no friendly pawns next to it on adjoining files.
    In this position white has an isolated pawn on d4, while black has no isolated



    The e-h files. The right half of the board where the queens and the bishops,
    knights, and rooks next to them initially start. Compare to ‘queenside’.

    Major Pieces🔗

    As in the Queen and Rooks. Also called Heavy Pieces.


    A quiet redeployment of pieces to a hopefully better position.


    Short for “Checkmate”.


    Any or all of your pieces and pawns, except the king.
    Both sides have equal material, even if their forces are different.
    Pawns = 1, Knights & Bishops = 3, Rooks = 5, and Queens =9.


    The part of the game that comes after the Opening and before the endgame, where
    both sides seek advantage. Arrived at upon completion of development of back-row

    Minor Pieces🔗

    Name given to the bishops and knights.



    A knight on an advanced outpost. Oftentimes the 6th rank.

    Open File🔗

    Open File

    A vertical row of 8 squares containing no pawns. Rooks typically should move to
    open files.

    Open Game🔗

    A position which in which pieces can move freely (usually because some pawns
    have been exchanged), with the possibility of sudden attacks or combinations.


    Known sequence of moves, usually published in a chess book. The Sicilian
    and The Colle’ are examples of openings.

    Overloaded Pieces🔗

    Overloaded Pieces

    A piece that is doing too much.
    In this position it is white’s move and black’s rook on a8 is overloaded. It
    cannot both protect the queen on a5 and the back rank successfully. If white
    plays 1.Qxa5 black cannot re-capture 1…Rxa5 for fear of checkmate by 2.Rd8#.



    Grandmaster Aaron Nimzovich’s term for giving a piece or square more protection
    from your pieces or pawns than is immediately needed to guard it.
    In this position in Fried Liver Attack white has three pieces attacking pinned
    black knight on d5, while black has three defenders. However black chooses to
    overprotect this knight with 1…c6.

    Passed Pawns🔗

    Passed Pawns

    A pawn that has moved beyond capture by the other side’s pawns and has no other
    pawns in front of it.

    Pawn Break🔗

    Pawn Break

    A move that invites the exchange of pawns to open the position.
    In the example, the pawn on c2 moving to c3, or the one on f2 moving to f4 would
    both be pawn-breaks. However, the moves 1.c4 or 1.f3 would not be pawn-breaks.

    Pawn Chain🔗

    Pawn Chain

    Two or more pawns of the same color linked together diagonally.

    Pawn Island🔗

    Pawn Island

    A group of pawns separated from other pawns of the same color. It is generally
    hard to defend a lot of pawn islands.

    Pawn Structure🔗

    Pawn Structure

    The overall position of the pawns in any particular moment of a game of chess.
    In the example shown, white has an excellent pawn structure, with only one pawn
    island and a strong, central, pawn-chain. Black’s pawns structure, on the other
    hand, is quite bad, with three pawn islands, doubled pawns, a backward pawn, and
    and isolated pawn.

    Perpetual Check🔗

    A position where one player can force the opposing side to repeat the same
    positions over and over again by checking their king on every move giving them
    limited options.

    Pigs on the Seventh🔗

    Pigs on the Seventh

    Two rooks acting together on the 7th rank. “Pigs on the 7th” typically gobble up
    all of your opponent’s pawns on that rank.



    When a piece cannot move without exposing a higher-valued piece to immediate
    capture, that piece is said to be “pinned”.

    Poisoned Pawn🔗

    Poisoned Pawn

    Any pawn that appears to be free for the taking but which will set off a trap
    against you if you do.
    White pawn on d4 is poisoned. If black plays Qxd4 white replies with Bxh7+,
    discovering the attack on the black queen.


    Quiet, fundamentally sound moves that don’t create weaknesses.


    Making a new queen or other piece when a pawn reaches the 8th rank.

    Protected Passed Pawn🔗

    Protected Passed Pawn

    A passed pawn that is protected by a friendly pawn.



    The a-d files. The left half of the board where the queens and the bishops,
    knights, and rooks next to them initially start.



    A row of eight horizontal squares.


    A number that comes from a formula devised by Dr. Arpad Elo which indicates a
    player’s strength, based on his or her win-loss record against other rated players.

    Removing the Defender🔗

    Removing the Defender

    A move (often a capture) which removes an enemy defender of another enemy square
    or piece.
    In the position, white is threatening to play 1.Bxc6, removing one of the two black
    defenders of the black bishop on e5 and leaving it available for capture. 1.Bxc6
    Bxc6 2.Nxe5 (if 2…Rxe5, white plays 3.Rxe5 and wins even more material)


    To concede defeat before being checkmated.



    (May be abbreviated to and called “sac”.) To give up a piece or to exchange a
    piece for a lesser-valued opponent’s piece in order to gain a positional or
    tactical advantage.
    In this position white is happy to sacrifice their queen on a6 to 1…Rxa6
    because they will follow up with checkmate, 2.Rd7#.

    Scholar’s Mate🔗

    Scholar's Mate

    A very aggressive although speculative opening for white with an early queen and
    bishop attack on f7. If black blunders, the game ends on move 4, thus
    alternative name “4-move mate”. 1. e4 e5 2. Qh5 Nc6 3. Bc4 Nf6?? 4. Qxf7# White
    can play this opening transposing moves 2 and 3.



    A tactic where you attack two of your opponent’s pieces at the same time along a
    rank, file, or diagonal, and the more-valuable piece is attacked first.


    Who controls more squares – often by advancing pawns.



    Position where a player “on move” is not in “check”, but also has no legal move.
    Such a game is considered to be a “draw”.

    Starting Position🔗

    Starting Position

    The initial setup for all the pieces and pawns at the beginning of a chess game.


    Your long range master plan. The main idea behind your moves, which guides your
    thinking during the game.



    When you copy your opponent’s moves or they copy yours in the opening. That is,
    a position where both sides are arranged the same. Example as shown in the
    diagram: 1. Nf3 Nf6, 2. g3 g6, 3. Bg2 Bg7, 4. O-O O-O arrives at a symmetrical
    position. “Copycatting” usually doesn’t work, by the way, as your plans to copy
    everything your opponent does gets blown out of the water by the first check to
    your king!


    A sequence of moves that limits the opponent’s options and may result in
    sufficient gain. There are many kinds of tactics, see fork, pin, skewer,
    discovered attack, battery, remove-the-defender etc.


    (Latin for “time”.) Amount of relative time represented by a single move.

    Time Control🔗

    The amount of time you have on your clock to either complete your game or make a
    given number of moves. Exceeding the time control means you lose the game.


    Provoking your opponent to make a really bad move that looks appealing for them
    often to capture material. See also Poisoned Pawn.

    Trapped Piece🔗

    A piece that has no escape from capture by the enemy.


    When promoting a pawn to something other than a queen.



    A square or pawn that is difficult or impossible to defend.
    The dark squares around black king g7 and h6 are weak (aka holes). White has
    already placed their pawn on f6. The plan is to bring white queen to h6, after
    that the checkmate on g7 is unstoppable. The fastest maneuver is 1.Qd2/Qc1
    followed by 2. Qh6.

    Windmill Attack🔗

    Windmill Attack

    A tactic in which a combination of discovered checks and regular checks against
    a castled king’s position, usually by a rook and a bishop, can win massive
    amounts of material.

    X-ray Attack🔗

    X-ray Attack

    A tactic where a piece attacks an enemy piece through another piece or pieces.
    White back rank checkmates in this position. After 1.Qe8+!, the White rook X-ray
    attacks e8 and therefore backs up the queen, so after 1…Rxe8, 2.Rxe8#



    (German for “compulsion to move”.) A situation that occurs when a player is
    forced to make an undesirable move. The player would prefer to pass and make no
    move, but a move has to be made.
    This seemingly-simple position shown here is drawn, if white is to move. White’s
    king has to either move to e6 with a stalemate or abandon their advanced passed
    pawn. But if it is black’s turn, they must move their king 1…Kf7, at which
    point 2.Kd7 and white pawn promotes to a queen.