Every term that ever made you nod along

A short, forcing sequence of moves that wins material or delivers mate.

The long-term plan — where pieces belong and which structures to aim for — as opposed to tactics.

The four central squares (d4, e4, d5, e5) and the fight to control them.

The ability to make threats the opponent must answer, keeping them reacting rather than acting.

A single move, thought of as a unit of time; you 'gain a tempo' by making a useful move that also forces a reply.

How exposed your king is to attack — usually the most important factor in the middlegame.

An attack on the king that must be answered immediately.

A bishop or a knight — the light pieces, each worth roughly three pawns.

The piece that moves any number of squares along a rank or file — worth about five pawns, and at its best on open lines.

One piece attacking two or more enemy pieces at the same time.

A piece that cannot move without exposing a more valuable piece behind it.

A pin in reverse — the valuable piece is in front and must move, exposing the piece behind.

Moving one piece to unveil an attack from a piece behind it.

Two pieces give check at the same time; the king must move.

A knight delivers mate to a king trapped by its own pieces.

Checkmate on the back rank against a king trapped by its own pawns.

An escape square made for the king, usually by advancing a pawn in front of it.

An unexpected in-between move played before the 'obvious' recapture.

Giving up material on purpose for a larger gain — mate, more material, or a winning attack.

A repeating see-saw of discovered checks that harvests enemy material.

Forcing an enemy piece away from an important duty so something it was guarding falls.

Luring an enemy piece — often the king — onto a square where it can be hit by a follow-up tactic.

A piece given more defensive jobs than it can perform, so removing or distracting it collapses the defence.

Two pieces lined up on the same file, rank or diagonal so their power stacks.

A piece attacking through an enemy piece to something valuable behind it.

Cutting the line between an enemy piece and what it defends by planting a piece in between.

A move — often a sacrifice — that vacates a square or line so another piece can use it.

A piece that is doomed anyway, so it grabs material or makes trouble before it falls.

The classic bishop sacrifice on h7 (or h2) to rip open a castled king.

Promoting a pawn to a knight, rook, or bishop instead of a queen.

A piece left undefended where it can be captured for free.

A forcing sequence of moves — usually with a sacrifice — that wins by force.

An unexpected in-between move — often a check — inserted before an expected recapture.

A check delivered by moving a piece out of the way of a rook, bishop, or queen behind it.

A non-forcing move — no check or capture — that quietly sets up an unstoppable threat.

Giving up a rook for a minor piece (the 'exchange') for positional compensation.

Giving up material for long-term positional gains rather than a forced win.

Attacking or exchanging the piece or pawn that defends a key point.

A square the king can escape to — or a hole you must give it before it's needed.

A pointless check in a lost position that only delays the inevitable.

A game or move of exceptional beauty — usually a surprising, sound sacrifice.

A piece asked to do two defensive jobs at once — remove one and the other collapses.

A piece with no safe squares — it can be hunted down and won for little or nothing.

Giving up material purely to vacate a square, line or diagonal for another piece.

Driving the enemy king out into the open and chasing it to mate with a series of checks.

Answering a check with a check of your own — often a saving or winning resource.

The square in front of the king, defended only by the king at the start — the classic attacking target.

A castled king boxed in by its own pawns, vulnerable to a rook or queen mate on the first rank.

Giving up the queen for a forced mate, a winning attack, or a decisive material return.

Trading a knight or bishop for a rook — a gain of roughly two pawns' worth of material.

Two mirror-image motifs: a pin freezes a piece in front of a bigger one; a skewer forces the bigger one to move and abandon what's behind it.

Deflection drags a defender away from its job; a decoy lures a piece onto a bad square. Same idea, opposite direction.

Freeing a pinned piece — by blocking, trading off the pinning piece, or moving the piece the pin protects.

A square in or near enemy territory, protected by a pawn, where a piece can sit untouchable.

A file with no pawns on it — ideal territory for rooks.

The arrangement of the pawns, which shapes the plans available to both sides.

A pawn with no friendly pawns on the files beside it, so no pawn can defend it.

Placing a piece directly in front of an enemy pawn to stop it advancing.

Preventing the opponent's ideas before pursuing your own.

A square that can no longer be defended by a pawn, inviting an enemy piece to settle there.

Two friendly pawns stacked on the same file after a capture.

A pawn left behind its neighbours that can't safely advance and is stuck defending a hole.

Advancing your fewer pawns on a wing against the opponent's majority to create a weakness.

Owning both bishops while the opponent has a bishop and knight, or two knights.

Active play that creates your own threats instead of passively defending.

Two adjacent friendly pawns on half-open files with no friendly pawns beside them.

One of the handful of moves worth calculating in a position.

Defending a key point more times than strictly necessary so the pieces doing it gain strength.

An isolated d-pawn — dynamic and space-giving in the middlegame, a target in the endgame.

Controlling more of the board with your pawns, giving your pieces more room than your opponent's.

A move that improves nothing but passes the turn, forcing the opponent to commit first.

Saving a lost position by setting a trap that the winning side falls into.

Advancing a wing of pawns en masse to blast open lines against the enemy king.

Bringing a rook into the attack along a rank, in front of its own pawns.

Persistent strength or weakness on squares of one colour — often after a key bishop is gone.

A file with no pawn of your own but an enemy pawn on it — a highway for your rooks.

A rook on the opponent's second rank — attacking pawns and boxing in the king.

More pawns than the opponent on one wing — the raw material for a passed pawn.

Two or more pawns side by side, controlling the squares in front of them together.

Limiting the mobility of an enemy piece — especially a knight — before you attack it.

Placing a rook on a closed file in anticipation of it opening later.

Marching the king across the board — to safety, or into the attack.

Two rooks on the same rank or file with nothing between them, defending each other.

The kings castle on different wings, turning the game into a pawn-storm race.

A pawn that can't advance and can't be defended by another pawn — a permanent target.

Non-material value — activity, initiative or structure — that offsets sacrificed material.

A pawn push that attacks an enemy pawn to open lines and get your pieces moving.

A bishop whose diagonals are open because your own pawns sit on the other colour.

A bishop hemmed in by its own pawns, which sit on its colour and block its diagonals.

Trading pieces to reach a clearer position — usually to convert an advantage or defuse an attack.

A bishop developed on the long diagonal from g2/b2 (or g7/b7) behind a knight-file pawn.

The classic minor-piece debate — the bishop's range against the knight's ability to hop and fork.

Both sides attack on different flanks — usually a race, often after opposite-side castling.

Two opposing pawns that could capture each other but haven't — a decision held in reserve.

A whole set of same-coloured squares left weak — usually after the bishop that guarded them is gone.

Placing pieces (and the king in the endgame) in or near the centre for maximum reach.

How much your pieces actually do — often worth more than a pawn or two of material.

A protected square in enemy territory where a knight can sit, immune to pawn attack.

Stacking both rooks on the same open file (or rank) to multiply their pressure.

Connected pawns advancing side by side, rolling forward to cramp or crash through the enemy position.

Pieces working together toward one goal — the whole worth more than the sum of the parts.

The bishop pair — two bishops versus bishop-and-knight or two knights, a small but lasting edge.

One weakness is rarely enough to win — create a second so the defender can't cover both.

Having more pieces in play than the opponent — a temporary edge that must be used quickly.

Habitually asking 'what does my opponent want?' and preventing it before pursuing your own plan.

An uncastled king stuck in the middle — a liability the moment the position opens.

Manually walking the king to safety when normal castling is unavailable.

Undermine a pawn chain at its root — the rear pawn that supports the whole structure.

Advancing a group of pawns where you outnumber the enemy, to create a passed pawn.

A heavy-piece battery of two rooks behind the queen, aimed down an open file.

Preventing an enemy pawn or piece from advancing before you attack it — Nimzowitsch's first step.

Parking a piece squarely in front of an enemy passed pawn to stop it dead.

More pawns than the opponent on the kingside — usable for an attack or a passed pawn.

A knight on the edge of the board controls fewer squares — usually a poorly-placed piece.

When you have no obvious plan, find your least-active piece and make it better.

Temporary, activity-based edges versus permanent, structural ones — and which suits the position.

Snatching material at the cost of time or safety — often punished, sometimes correct.

Advancing your queenside pawns to gain space, cramp the opponent, or start a minority attack.

A classic minor-piece imbalance: a knight that dominates fixed, same-coloured pawns against a bishop boxed in behind its own.

A cramped-looking pawn setup (pawns on a6/b6/d6/e6) that coils and waits to strike with a well-timed break.

Unequal trades of different piece types (e.g. two minor pieces for a rook and pawn) that need judgement, not just counting, to evaluate.

A diagonal with no pawns blocking it — a bishop or queen's highway across the board.

A king with a thin or missing pawn shield, regardless of whether it's castled — a standing target for anyone with pieces aimed at it.

A structural flaw — a hole, a backward pawn, a weak square — that can't be fixed by a single good move, only worked around or defended forever.

Activity, tempo, or an exposed enemy king that makes up for a material deficit — but only for as long as it lasts.

Simplifying toward an endgame specifically because your material or structural edge gets clearer, not smaller, as pieces come off.

Pushing pawns or pieces further than they can be supported, creating weaknesses behind the advance.

Bringing your pieces off the back rank into active, useful positions.

The starter rules: control the centre, develop pieces, castle early, don't move the queen out too soon.

An opening that sacrifices material (usually a pawn) for development, the centre, or attacking chances.

Developing a bishop to the long diagonal from b2, g2, b7 or g7.

The body of established, analysed best moves in known openings and standard endgames.

Reaching the same position by a different move order.

A standard, well-known starting position that theory branches out from.

A new move in a known position that departs from established theory.

A prepared line that punishes a natural-looking but mistaken reply.

A pawn that looks free but whose capture leads to trouble — often a trapped piece.

Your chosen set of openings for White and Black — the lines you know and play by design.

A pawn with no enemy pawns able to block or capture it on its way to promotion.

A pawn reaching the last rank becomes any piece you choose — almost always a queen.

Kings facing each other with one square between them; the side NOT to move usually holds the advantage.

A position where every legal move worsens your position — but passing is not allowed, so you must move.

In the endgame the king becomes a strong piece and should march toward the action.

An unbroken series of checks the opponent can never escape, forcing a draw by repetition.

The fundamental winning technique in rook endgames — 'building a bridge'.

The fundamental drawing technique in rook endgames — the third-rank defence.

Losing a tempo with the king (taking three moves to reach a square two allow) to put the opponent in zugzwang.

A drawn setup the stronger side cannot break down despite being materially ahead.

Each side has one bishop, on opposite colours — strongly drawish in the endgame, sharp in the middlegame.

Two adjacent passed pawns that defend each other as they advance.

A passed pawn far from the main body of pawns — a decisive trump in king-and-pawn endings.

A bishop that doesn't control the queening square of a rook's pawn — a famous drawn fortress.

Pairs of squares in a locked pawn ending where each king must mirror the other to hold or win.

A pawn sacrifice that forces a passed pawn through a seemingly solid pawn wall.

A square whose control decides a king-and-pawn ending.

Trapping a piece that has many squares but nowhere safe to go.

A mutual zugzwang in a king-and-pawn ending where whoever moves loses.

Using your king to physically block the enemy king's path in an endgame.

Both sides pushing passed pawns to queen first — often decided by a single tempo or a check.

The most common endgame of all — rook and pawns each side, famously drawish and technique-heavy.

The winning technique in the Lucena position — use your rook to shield your king from checks.

In the endgame the king becomes a fighting piece — centralise it and use it to attack and support.

Both sides push passed pawns for promotion — often a matter of a single tempo.

A rook's pawn plus a bishop that can't control the promotion square — a notorious drawn exception.

A king that chases two goals at once by taking a diagonal path — the idea behind Réti's famous study.

Kings and pawns only — the most exact phase of chess, where a single tempo decides everything.

A drawn result forced by a setup — a fortress or perpetual — despite a big material deficit.

A defensive resource that engineers stalemate to steal a draw from a lost position.

An endgame maxim — improve every piece to the max before committing to the decisive break.

A position that is zugzwang for whoever is to move — the losing spot changes hands with the move.

Sacrificing one or two pawns to force a passed pawn through the enemy line.

The precise, patient method of converting a clear advantage into a win without fireworks.

The hardest basic checkmate — forcing mate with king, bishop and knight against a lone king.

A queen usually beats a lone pawn on the 7th — except for a rook's or bishop's pawn, which can draw.

A key drawing method in rook-and-rook's-pawn endings — the rook harasses from the side.

A spare pawn move held back to lose a move at will and put the opponent in zugzwang.

Using your king to block the enemy king's path — a body-check that wins the race.

A defensive setup the stronger side can't break, so being material down draws anyway.

A pure pawn endgame reduced to counting: whose passed pawn queens first?

The final phase of the game, once most pieces are traded off and the king becomes an active fighting piece.

The one move where the king and a rook move together, tucking the king to safety.

A special pawn capture of a pawn that just advanced two squares, as if it had moved only one.

The side to move has no legal move and is not in check — the game is an immediate draw.

The king is in check and there is no legal way out — the game is over.

The standard way to record moves: files a–h, ranks 1–8, so e4 and Nf3 mean exact squares.

A single line of text that captures an exact position — pieces, side to move, castling rights and more.

The standard text format for recording a whole game — its moves, players, result and comments.

Either player may claim a draw after 50 moves with no capture and no pawn move.

A draw may be claimed when the same position occurs three times with the same player to move.

Blocking a check by placing a piece between the checking piece and the king.

Promoting a pawn to a knight, rook or bishop instead of a queen — occasionally the only winning move.

A number measuring playing strength; you gain points for beating higher-rated players and lose them for losing to lower-rated ones.

A refinement of Elo that also tracks how certain your rating is (your 'rating deviation').

The time-control categories, from a minute a side (bullet) to hours (classical).

Time added to your clock after each move, so you are not flagged with a winning position.

A strong tournament result that counts toward earning an IM or GM title.

A tournament format that pairs players on equal scores each round without anyone being eliminated.

A fast time control, usually 3–5 minutes per player for the whole game.