A piece is left en prise — undefended and capturable for free. Failing to take a hanging piece, or leaving one of your own pieces hanging, is the most common blunder at all levels below master.
A piece has no safe square to retreat to and must be lost. Bishops trapped behind pawn chains, knights stranded on the rim, or rooks cut off on the edge are classic examples.
A single piece is defending two (or more) things simultaneously. By attacking both targets at once, you force it to abandon one of its duties, winning material.
Eliminate the piece that is defending a key square or another piece, leaving it unprotected. This can be a capture, a deflection, or a sacrifice that lures the defender away.
Capture or drive away the pawn or piece supporting another piece, causing the entire defensive structure to collapse. Similar to removal of defender but specifically targeting the base of a pawn chain or a protecting pawn.
Voluntarily giving up material to gain a compensating advantage — usually a mating attack, a positional gain, or a forced sequence that wins back more material. Sacrifices require precise calculation.
A piece about to be captured takes as much material as possible before it is taken — "going out in a blaze of glory." This converts an inevitable material loss into a smaller one.
A piece cannot move because doing so would expose a more valuable piece (or the king) behind it to attack. An absolute pin is against the king and the pinned piece literally cannot move legally. A relative pin is against a valuable piece — moving the pinned piece would lose material.
A single piece attacks two or more enemy pieces simultaneously. The opponent can only save one, so you win the other. Knights are the most feared forking piece because of their unusual movement pattern.
The opposite of a pin. A valuable piece is attacked and must move, exposing a less valuable piece behind it which is then captured. Think of the king skewered by a rook — the king must flee, abandoning the rook behind it.
Moving one piece unveils an attack from the piece behind it. The moving piece may itself create a threat, resulting in two simultaneous attacks — one of the most powerful tactical weapons in chess.
A single move creates two threats simultaneously. The opponent cannot meet both in one move. Closely related to the fork but broader — includes any situation where two things are threatened at the same time.
Lure or force a defending piece away from a crucial square or duty. After the deflection, the square it was protecting becomes accessible, or the piece it was defending becomes vulnerable.
Sacrifice a piece to lure (attract) the enemy king or a valuable piece to a square where it becomes vulnerable to a follow-up tactic — usually a fork, skewer, or mating attack.
A piece is sacrificed or moved to a square between two enemy pieces, cutting their coordination. Often used to interrupt a rook defending along a rank or a bishop protecting a diagonal simultaneously.
A piece exerts influence through another piece. Commonly seen when a rook behind a queen can recapture after an exchange, or when bishops on opposite sides of a pawn both control the same square through the pawn.
German for "in-between move." Instead of making the expected recapture or response, an intermediate move (often a check or a strong threat) is inserted first. This changes the evaluation of the position before completing the expected sequence.
Instead of passively defending an attack, you create a threat so strong that the opponent must respond to it, effectively ignoring their attack. The counter-threat changes the tempo and momentum of the game.
A piece sacrifices itself to vacate a square or line for a more powerful piece. The square cleared is more valuable than the piece surrendered.
A piece delivers a check or captures material and then retreats to safety before the opponent can coordinate a response. The gain is secured without leaving the attacking piece exposed.
Gaining a move (a tempo) by forcing the opponent to respond to a threat, allowing you to execute your plan a move earlier than expected. Tempo tactics often involve checks or attacks that force a reactive response.
The king is trapped on its back rank by its own pawns, unable to escape a rook or queen invasion. The "back rank mate" is one of the most common tactical motifs in beginner-to-intermediate games.
Two or more pieces of the same type are aligned to mutually support each other and create a combined attacking force. Common examples: two rooks on the same file (rook battery), or queen and bishop on the same diagonal (bishop-queen battery).
A specific battery formation: queen behind two rooks (or two rooks behind the queen) on the same file. Named after World Champion Alexander Alekhine, who used it to devastating effect. It creates overwhelming pressure on a file that is nearly impossible to hold.
Exploiting a weakness in the opponent's king shelter — typically an exposed king after castling or one that hasn't castled. Pawn storms, piece sacrifices, and open files toward the king are all king safety attacks.
A piece controls all squares a specific enemy piece can move to, effectively trapping it. The dominated piece is not immediately captured, but it is completely neutralised and equivalent to lost material.
Exchanging pieces to reach a position that is technically won but simpler to convert. Often used when ahead in material — trading off all attacking pieces reduces the opponent's counterplay.
Sacrificing material to shatter the opponent's pawn cover around their king or in a critical area, creating permanent weaknesses that other pieces can exploit. The structural damage outlasts the sacrificed material.
Continuously threatening a piece without allowing the opponent to consolidate. Unlike perpetual check (which forces a draw), perpetual attack is used to maintain winning pressure — the opponent is always on the back foot defending.
A coordinated web of pieces that surrounds and traps the enemy king, making checkmate inevitable even if it requires several more moves. The king has no escape — every flight square is covered.
Two pieces give check simultaneously. The only legal response is to move the king — it is impossible to block two checks or capture two checking pieces in one move. Double checks are often the final forcing move in a brilliant combination.
The king is surrounded and smothered by its own pieces, and a knight delivers checkmate from which there is no escape. Classic smothered mate involves a queen sacrifice to force the king into the corner.
A rook and bishop (or rook and knight) work together in a repeating pattern: the rook gives discovered check, the bishop (or knight) captures a piece, then the pattern repeats. Each repetition wins more material or closes in on checkmate.
A bishop sacrifice on h7 (or h2) that destroys the king's pawn cover and exposes it to a mating attack. The sacrifice is named after the Trojan horse — a "gift" that conceals danger. Typically followed by Ng5+ and Qh5 creating an irresistible attack.
Responding to a check with another check — often in a different direction — which changes the dynamic of the position. A powerful defensive or attacking resource that can completely reverse the situation.
A series of checks from which the king cannot escape — but the checking player cannot deliver checkmate either. The result is a draw by repetition. Used as a defensive resource when a worse position can be salvaged this way.
A pawn reaches the 8th rank and promotes to a queen, rook, bishop, or knight. Promoting to a queen is usually best. Passed pawn races, clearance sacrifices, and endgame techniques all aim to force promotion.
Promoting a pawn to a rook, bishop, or knight instead of a queen. Counterintuitively, underpromotion is sometimes better — promoting to a knight can give check where a queen cannot, or avoid a stalemate that queening would produce.
A special pawn capture available only when an opponent's pawn uses its initial two-square move to land beside your pawn. You may capture it as if it had moved only one square — but only on the very next move. Missing en passant can be a tactical error that the engine flags.
A variant of decoy — a sacrifice forces an enemy piece to move to a specific square where it becomes vulnerable. The attracted piece is drawn into a bad position against its will.
German for "compulsion to move." The player whose turn it is is in a losing position precisely because they must move — any move they make worsens their situation. Zugzwang is most common in king-and-pawn endgames.
Deliberately engineering a stalemate position to escape a lost endgame. When your king has no legal moves and you are not in check, the game is drawn — a critical defensive resource. The winning side must be careful not to create it accidentally.