Openings and endgames
Checkmate patterns, endgame technique, and opening families.
435 terms
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Checkmate patterns
42- Back-rank mateCheckmate delivered by a rook or queen on the opponent's home rank against a king trapped by its own pieces.Basic
- Smothered mateA checkmate delivered by a knight to a king whose movement is blocked mainly by its own pieces.Basic
- Corridor mateA checkmate in which a king is confined to a narrow line and a long-range piece attacks along that line.Basic
- Corner mateA mating pattern against a king trapped in a corner, often with a knight delivering the final check.Basic
- Blind swine mateA mating pattern in which two coordinated rooks on the seventh rank confine the king to a two-by-two area.Basic
- Arabian mateA pattern in which a rook mates beside the enemy king while a knight protects the rook and covers the final escape.Intermediate
- Anastasia's mateA pattern where a rook or queen mates along an open line while a knight cuts off a king trapped by the board edge.Intermediate
- Boden's mateA mating pattern in which two bishops work on crossing diagonals against a king blocked by its own pieces.Intermediate
- Damiano's mateA mating pattern in which a queen supported by an advanced pawn checkmates a confined king at close range.Intermediate
- Epaulette mateA mate in which two defending pieces block the squares on either side of their king like ornamental epaulettes.Intermediate
- Greco's mateAn edge mating pattern in which a rook or queen checks while a bishop covers the king's diagonal escape.Intermediate
- Hook mateA mating pattern in which a rook, knight, and usually a pawn form a supporting chain around the enemy king.Intermediate
- Lolli's mateA pattern in which a queen enters beside a king sheltered by its pawns and delivers mate with support from a deeply advanced pawn.Intermediate
- Morphy's mateA rook-and-bishop pattern in which the bishop mates a cornered king while the rook cuts off its escape.Intermediate
- Dovetail mateA mate in which a protected queen sits diagonally beside the king while two of the defender's own pieces block the remaining exits.Intermediate
- Swallow's tail mateA mate in which a protected queen checks from a square beside the king on the same row or column while two of the defender's own pieces close its exits.Intermediate
- Ladder mateA technique in which two rooks, or a rook and queen, reduce the king's space along successive rows or columns.Beginner
- King and queen checkmateA winning method against a lone king in which the queen shrinks its space and the attacking king covers nearby squares.Beginner
- King and rook checkmateA winning method against a lone king in which the rook cuts lines and the attacking king helps drive it to the edge.Basic
- Two-bishop checkmateA mating method in which bishops traveling on different square colors and their king drive the enemy king to an edge or corner.Intermediate
- Bishop and knight checkmateA precise mating method in which king, bishop, and knight drive the enemy king to a corner matching the bishop's color.Advanced
- Fool's mateThe fastest possible checkmate from the starting position, caused by extreme weakening of the white king's diagonal.Beginner
- Scholar's mateAn early queen-and-bishop attack on f7 or f2 that can mate in four moves if the defender ignores the threat.Beginner
- Légal's mateAn early mating pattern in which a bishop and two knights mate after an apparent queen sacrifice.Basic
- Opera mateA mating pattern in which a rook gives checkmate while a bishop protects it and the enemy king has no escape.Intermediate
- Blackburne's mateA mating pattern against a castled king in which two bishops and a knight coordinate the attack and cover every escape square.Intermediate
- Anderssen's mateA pattern in which a rook attacks the king on the board's last row with no legal reply, diagonally supported by a protected advanced pawn.Intermediate
- Balestra mateA queen-and-bishop pattern in which the queen closes the exits and the bishop attacks the king with no legal reply.Intermediate
- Damiano's bishop mateA pattern in which a queen attacks beside the king with no legal reply, protected by a bishop that prevents its capture.Intermediate
- Double bishop mateA mating pattern in which two coordinated bishops attack along parallel diagonals and cover the king's exits.Intermediate
- Double knight mateA mating pattern in which one knight checks and the other covers the decisive escape squares.Advanced
- Kill box mateA queen-and-rook mating pattern that traps the king inside a three-by-three box and mates with the rook.Intermediate
- Max Lange's mateA pattern in which the queen gives mate with support from a bishop that also covers an escape square.Intermediate
- Mayet's mateA pattern in which a rook mates near the king while a distant bishop supports it along a long diagonal.Intermediate
- Pawn mateA checkmate in which a pawn is the piece that gives the final attack on the king.Basic
- Pillsbury's mateA pattern against a king near a corner in which a rook mates on an open file while a bishop controls the corner.Intermediate
- Rainbow mateA rare pattern in which both bishops and both knights form a curved, coordinated mating arrangement.Advanced
- Réti's mateA pattern in which a bishop mates with rook or queen support while the defender's own pieces imprison the king.Intermediate
- Stamma's mateAn endgame pattern in which king and knight mate because the enemy king is trapped in front of its own advanced rook pawn.Advanced
- Suffocation mateA pattern in which a knight gives mate while a bishop or queen controls the king's escape routes.Intermediate
- Triangle mateA pattern in which the queen mates with support from a rook two squares behind it on the same file.Intermediate
- Vuković's mateA pattern in which a protected rook mates at the board's edge while a knight covers the remaining exits.Intermediate
Endgame concepts and techniques
81- King and pawn versus king endingA three-piece ending in which a king and pawn try to promote against a lone defending king.Basic
- Pawn endingAn ending in which only the two kings and one or more pawns in total remain.Basic
- Rook endingAn ending in which rooks are the main remaining pieces, usually together with both kings and several pawns.Basic
- Rook and pawn versus rook endingA five-piece ending in which a king, rook, and pawn try to defeat a king and rook.Basic
- Bishop endingAn ending in which bishops are the main remaining pieces, normally together with kings and pawns.Basic
- Knight endingAn ending in which knights are the main remaining pieces, normally together with kings and pawns.Basic
- Minor-piece endingAn ending in which bishops or knights are the main remaining pieces, with no queens or rooks.Basic
- Queen endingAn ending in which queens are the main remaining pieces, normally together with kings and pawns.Basic
- Queen and pawn versus queen endingA five-piece ending in which a queen and pawn try to defeat a defending queen.Basic
- OppositionA relationship between the kings that uses their spacing and the move order to make one king yield an important square.Basic
- Direct oppositionA position in which the kings share a horizontal row or vertical column with exactly one empty square between them.Basic
- Distant oppositionA relationship in which aligned kings are separated by an odd number of empty squares greater than one.Basic
- Diagonal oppositionA relationship in which the kings stand on the same diagonal with one empty square between them.Basic
- Key squareA square that lets the attacking king force promotion in a king-and-pawn versus king ending when it is occupied.Basic
- Critical squareA square whose occupation forces a concrete goal, such as promoting a pawn or winning material.Basic
- Square of the pawnAn imaginary area showing whether a king has enough moves to catch a pawn before it promotes.Basic
- Rule of the squareA visual test for whether a king can catch an unsupported pawn before it promotes.Basic
- Active kingA king that contributes usefully by attacking, defending, supporting pawns, or controlling important squares.Basic
- Cutting off the kingRestricting the opposing king with a controlled line, usually a rook's rank or file, to keep it away from the action.Basic
- Corresponding squaresPaired squares where occupying one requires a precise king response on the other to preserve the position.Intermediate
- TriangulationA maneuver that returns to an equivalent position with the move transferred to the opponent.Intermediate
- OutflankingA king maneuver that goes around the opposing king to penetrate from the side or reach a decisive square.Intermediate
- ShoulderingA king technique that controls the opposing king's route and forces it to take a longer path.Intermediate
- Spare tempoA saved waiting move, usually a pawn move, that transfers the critical obligation to move to the opponent.Intermediate
- Bridge buildingA winning rook-and-pawn method in which the rook shelters its king from side checks.Intermediate
- Rook on the seventh rankA rook placed on the opponent's second rank, where it often attacks pawns and restricts the king.Intermediate
- Wrong rook pawnAn edge-file pawn whose promotion square cannot be controlled by the bishop supporting it.Intermediate
- Wrong bishopA bishop that cannot control the square color required for a specific endgame task.Intermediate
- Opposite-colored bishopsA position where each side has a bishop that travels on a different color of squares.Intermediate
- Same-colored bishopsA position where both sides' bishops travel on squares of the same color.Intermediate
- Bishop versus knight endingAn ending in which one side has a bishop and the other has a knight, usually with kings and pawns still on the board.Intermediate
- Rook versus pawn endingAn ending where one side has a king and rook while the other tries to bring a lone pawn to the last rank with help from its king.Intermediate
- Queen versus rook endingA pawnless ending in which a king and queen try to defeat a king and rook.Advanced
- Stalemate resourceA defensive idea that forces or threatens stalemate to save a position that would otherwise be lost.Intermediate
- ZugzwangA position in which every legal move makes the situation worse for the player whose turn it is.Intermediate
- Mutual zugzwangA position in which either side would be disadvantaged if it were that side's turn to move.Intermediate
- Lucena positionA winning rook-and-pawn versus rook setup where the attacking king occupies the promotion square and builds shelter from checks.Advanced
- Philidor positionA drawing rook-and-pawn versus rook method that blocks the attacking king with a rook barrier, then checks from behind.Advanced
- Vancura positionA drawing defense against rook and rook pawn where the defending rook attacks from the side and gives lateral checks.Advanced
- Saavedra positionAn endgame study where a pawn defeats a rook by promoting to a rook and avoiding a stalemate resource.Advanced
- Troitsky lineA theoretical boundary used to judge when king and two knights can force mate against king and a securely blockaded pawn.Expert
- FortressA stable defensive setup where a side with fewer or less valuable pieces prevents all decisive progress.Intermediate
- Pawn raceAn ending situation where both sides advance passed pawns and compete to reach the last rank first or stop the opposing pawn.Basic
- Tarrasch ruleThe principle that a rook usually belongs behind a passed pawn, whether the pawn is friendly or hostile.Intermediate
- Pawn breakthroughA forcing sequence of pawn advances and sacrifices that creates a passed pawn able to reach the last rank.Intermediate
- Réti maneuverA diagonal king route that pursues two goals at once, usually supporting a friendly pawn while catching an enemy pawn.Intermediate
- Back-rank defenseA drawing method in rook and pawn versus rook: the king blocks the pawn while the rook waits on the row nearest its own side.Intermediate
- Bähr's ruleA geometric rule for evaluating certain endings with two blocked rook pawns and one distant passed pawn.Advanced
- Bishop and pawn versus bishop endingAn ending with king, bishop, and pawn against king and bishop, whose result depends on precise geometry.Advanced
- Bishop and pawn versus knight endingAn ending where king, bishop, and pawn try to overcome king and knight, with the result highly sensitive to position and move.Advanced
- Botvinnik's ruleThe principle that knight endings resemble pawn endings, although concrete knight tactics still matter.Intermediate
- Centurini's ruleA test for whether the defender can hold certain same-colored bishop endings while one pawn down.Advanced
- Checking distanceThe separation a rook needs to give repeated checks without being attacked or blocked with gain of time.Advanced
- Cochrane defenseA drawing method in rook versus rook and bishop that pins the bishop in front of its king and keeps the kings apart.Expert
- Endgame theoryThe organized body of positions, methods, and results used to play the final phase of a chess game correctly.Intermediate
- Frontal defenseA drawing method in rook versus rook and pawn where the defending rook stands in front of the pawn and checks the king head-on.Advanced
- Karstedt's fortressA specific king, bishop, and knight formation that can draw against a queen by blocking the opposing king's entry.Expert
- Knight and pawn versus bishop endingAn ending where king, knight, and pawn try to promote against a defending king and bishop.Advanced
- Knight and pawn versus knight endingAn ending where king, knight, and pawn try to overcome a defending king and knight blockade.Advanced
- Last-rank defenseA concrete drawing method where the defending rook maneuvers along the promotion rank against a highly advanced pawn.Advanced
- Lolli positionA theoretical winning rook and bishop versus rook position built on coordinated mating threats near the edge.Expert
- Mined squaresA pair of king squares where entering first allows a matching reply that creates zugzwang or decisive penetration.Advanced
- Pawnless endingAn ending with few pieces and no pawns, often decided by mating ability, fortresses, and piece coordination.Intermediate
- Queen versus bishop and knight endingA pawnless ending in which the queen normally wins, although exceptional defensive coordination can create a drawing fortress.Expert
- Queen versus pawn endingAn ending in which the queen usually stops the pawn and wins, with important exceptions when the pawn is one step from promotion.Intermediate
- Queen versus rook and minor piece endingA normally balanced pawnless ending in which the rook and a bishop or knight must coordinate against the queen's double attacks.Expert
- Queen versus two rooks endingA closely balanced ending that is usually drawn, but can swing according to king safety and the coordination of the rooks.Advanced
- Rook and bishop versus rook endingA pawnless ending that is usually drawn with correct defense, although the rook and bishop create difficult practical problems.Advanced
- Rook and knight versus rook endingA pawnless ending that is normally drawn, but poor placement of the king or rook can allow a forced win.Advanced
- Rook and two pawns versus rook endingAn ending in which a rook and two pawns try to defeat a lone opposing rook.Advanced
- Rook versus minor piece endingAn ending where a rook faces a bishop or knight, either with pawns or without them.Intermediate
- Rule of fiveA practical rule estimating whether a protected pawn wins when the rook cuts off the defending king by files.Advanced
- Rule of threeA defensive rule requiring at least three horizontal rows of checking distance in certain rook and pawn endings.Advanced
- Second Troitsky lineA refined theoretical boundary for winning with two knights against a pawn within the practical fifty-move limit.Expert
- Second-rank defenseA passive rook versus rook and bishop defense that keeps the king and rook one line from the board edge.Expert
- Short-side defenseA rook and pawn versus rook drawing method that places the king on the short side and rook on the long side.Advanced
- Szén positionA drawing formation in rook against rook and bishop, recognized by the L-shaped relationship between the kings.Expert
- TrébuchetA reciprocal-zugzwang pawn position where the player to move must abandon a pawn and loses.Intermediate
- Two knights versus pawn endingAn ending where two knights may use the enemy pawn to force a mate they could not force against a lone king.Expert
- Two minor pieces versus rook endingAn imbalanced ending where two bishops, bishop and knight, or two knights face a rook.Advanced
- UmbrellaA pawn that shelters the king from side or rear checks, especially in rook endings.Intermediate
Opening principles
21- NoveltyA new move or idea introduced in an opening position that was already known and studied.Basic
- Developing moveA move that brings a piece from its starting square to a square where it can participate more effectively.Beginner
- Central pawnA pawn located on one of the two central files, the d-file or e-file.Beginner
- Castle earlyAn opening principle that recommends castling before the king becomes exposed or the opportunity is lost.Beginner
- Fight for the centerThe principle of contesting the central squares to give your pieces more freedom and restrict the opponent's pieces.Beginner
- Connect the rooksTo clear the path between the two rooks so they can defend and coordinate along the same rank or file.Beginner
- Gain of tempoAn advantage created when a useful move forces the opponent to respond and delays the opponent's own plan.Basic
- Lead in developmentA temporary advantage held by the player whose pieces are more active, coordinated, and ready to act.Basic
- Open lineA clear straight path along which a rook, bishop, or queen can move without a blocking piece.Basic
- FianchettoThe development of a bishop to b2, g2, b7, or g7 after moving the pawn in front of that square.Basic
- TabiyaA familiar position reached after a heavily studied opening sequence, from which several important choices become available again.Intermediate
- Home preparationStudy completed before a game to understand openings, plans, replies, and possible surprises.Intermediate
- Book moveAn opening move known to theory and recorded in books, databases, or other established references.Basic
- CountergambitA gambit offered by the second player, normally Black, often as an active answer to an opening offer or pressure.Intermediate
- EqualizationThe point at which Black neutralizes White's small first-move advantage and reaches an approximately balanced position.Intermediate
- GambitA deliberate opening material offer made for compensation such as rapid development, initiative, space, or open lines.Basic
- Loss of tempoAn inefficient use of a move that requires an extra turn or lets the opponent improve while creating a threat.Basic
- Opening systemAn opening approach built around a reusable setup and plans against several opposing responses and move orders.Intermediate
- Opening theoryThe public body of studied moves, ideas, and evaluations for the early positions of a chess game.Intermediate
- Out of bookThe point at which a game leaves the opening moves a player or source knows and can follow from memory.Basic
- Reversed openingA known opening or setup played with the colors exchanged, usually giving White one extra move compared with the original version.Intermediate
Open games
72- Open GameThe family of openings that begins when White plays 1.e4 and Black answers 1...e5.
- Italian GameThe opening defined by 1.e4 e5 2.Nf3 Nc6 3.Bc4, with White's bishop aiming at f7.
- Giuoco PianoThe Italian Game branch defined by 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5.
- Giuoco PianissimoA quiet Italian Game system in which White plays d3 and delays opening the center.
- Evans GambitAn aggressive Giuoco Piano branch in which White plays 4.b4 and offers a pawn to gain activity and open the center.
- Two Knights DefenseAn Italian Game variation where Black develops the second knight to f6 and attacks White's e4-pawn.
- Fried Liver AttackA Two Knights Defense line where White sacrifices a knight on f7 to expose Black's king and start an attack.
- Scotch GameAn opening beginning 1.e4 e5 2.Nf3 Nc6 3.d4, where White immediately challenges Black's central e5-pawn.
- Scotch GambitA Scotch Game variation where White plays 4.Bc4, delays recapturing the pawn, and seeks rapid development.
- Petrov's DefenseA defense beginning 1.e4 e5 2.Nf3 Nf6, where Black counterattacks e4 instead of directly protecting e5.
- Vienna GameAn opening beginning 1.e4 e5 2.Nc3, developing the b1-knight first while preserving several attacking and positional options.
- Vienna GambitA Vienna Game system where White plays an early f4 to challenge e5 and gain activity, even if the pawn is offered.
- Four Knights GameAn opening where both players develop both knights toward the center within the first three moves.
- Ruy LopezAn opening beginning 1.e4 e5 2.Nf3 Nc6 3.Bb5, where White indirectly pressures Black's e5-pawn.
- Ruy Lopez, Exchange VariationA Ruy Lopez line where White trades the light-squared bishop for the c6-knight and changes Black's pawn structure.
- Berlin DefenseA Ruy Lopez defense with 3...Nf6 that develops a knight, attacks e4, and can lead to queenless strategic play.
- Marshall AttackA Closed Ruy Lopez gambit where Black plays ...d5 and offers a pawn to gain the initiative against White's king.
- Closed Ruy LopezA Ruy Lopez family defined by 5...Be7, where Black maintains the center and prepares to castle instead of taking e4.
- Open Ruy LopezA Ruy Lopez variation defined by 5...Nxe4, where Black takes the central pawn and accepts active play in a more open position.
- Ruy Lopez, Arkhangelsk VariationAn active Ruy Lopez defense where Black plays ...b5 and ...Bb7 to pressure the center from a long diagonal.
- Ruy Lopez, Breyer DefenseA Closed Ruy Lopez system where Black retreats the c6-knight to b8 so it can reorganize through d7.
- Ruy Lopez, Zaitsev SystemA dynamic Closed Ruy Lopez system in which Black develops the bishop to b7 to increase pressure on e4.
- Ruy Lopez, Chigorin DefenseA Closed Ruy Lopez defense in which Black plays ...Na5 to displace White's bishop and prepare ...c5.
- King's GambitAn opening in which White offers the f2-pawn to divert Black's e5-pawn and gain activity.
- King's Gambit AcceptedThe King's Gambit continuation in which Black takes the offered pawn with ...exf4.
- King's Gambit DeclinedA family of replies in which Black does not take the pawn on f4 and chooses development or central counterplay instead.
- Bishop's OpeningAn opening beginning with e4, e5, and Bc4, developing the bishop toward f7 before moving the king's knight.
- Center GameAn opening in which White immediately challenges Black's e5-pawn with d4 and usually recaptures on d4 with the queen.
- Danish GambitA gambit beginning with e4, e5, d4, and c3, offering pawns to develop both bishops very quickly.
- Ponziani OpeningAn opening in which White plays c3 on move three to prepare a broad center with d4.
- Philidor DefenseA defense beginning with e4, e5, Nf3, and ...d6, supporting the e5-pawn with a compact structure.
- Latvian GambitAn aggressive reply to e4 and Nf3 in which Black plays ...f5 and offers pawns to attack the center.
- Elephant GambitA countergambit in which Black answers e4 and Nf3 with ...d5, offering a pawn to open the center and gain time.
- Bishop's Opening, Urusov GambitA Bishop's Opening gambit in which White offers a pawn for rapid development and central pressure.
- Damiano DefenseThe reply 2...f6 to 1.e4 e5 2.Nf3, intended to support e5 but weakening the king and allowing a strong tactic.
- Four Knights Game, Belgrade GambitA Scotch Four Knights gambit in which White plays 5.Nd5 instead of immediately recovering the pawn.
- Four Knights Game, Halloween GambitAn aggressive gambit in which White sacrifices a knight on e5 to advance the central pawns with tempo.
- Four Knights Game, Rubinstein VariationThe active reply 4...Nd4 to the Spanish Four Knights, breaking symmetry and creating several simultaneous attacks.
- Four Knights Game, Scotch VariationA Four Knights branch in which White plays 4.d4 to challenge Black’s e5-pawn immediately.
- Four Knights Game, Spanish VariationA Four Knights branch in which 4.Bb5 pressures the knight that helps support Black’s e5-pawn.
- Italian Game, Hungarian DefenseA solid Italian Game defense in which Black plays 3...Be7 and avoids an immediate confrontation.
- Italian Game, Two Knights Defense, Lolli AttackAn attack defined by 6.d4, opening lines and strengthening White’s pressure instead of sacrificing immediately on f7.
- Italian Game, Two Knights Defense, Polerio DefenseThe defense 5...Na5, attacking the c4-bishop and avoiding the central recapture that permits the Lolli and Fried Liver attacks.
- Italian Game, Two Knights Defense, Traxler CounterattackThe tactical reply 4...Bc5, ignoring White’s pressure on f7 and creating immediate threats against f2 and the white king.
- Italian Game, Two Knights Defense, Ulvestad VariationThe reply 5...b5, immediately attacking the c4-bishop and gaining time before resolving White’s pawn on d5.
- King's Gambit Accepted, Bishop's GambitA King’s Gambit Accepted line in which White develops 3.Bc4, attacks f7, and delays the g1-knight.
- King's Gambit Accepted, Cunningham DefenseThe defense 3...Be7, developing the bishop and preparing ...Bh4+ against the white king in some lines.
- King's Gambit Accepted, Fischer DefenseThe defense 3...d6, controlling e5, restricting White’s knight, and preparing to support the extra pawn with ...g5.
- King's Gambit Accepted, Kieseritzky GambitAn attacking King’s Gambit branch in which White centralizes a knight and pressures the advanced pawns near Black’s king.
- King's Gambit Accepted, Muzio GambitAn extreme sacrifice in which White secures the king and may give up a knight to attack quickly.
- King's Gambit Declined, Falkbeer CountergambitA central reply to the King’s Gambit in which Black declines the offered pawn and counterattacks immediately.
- Max Lange AttackAn attacking system in which White secures the king and chases a black knight with a central pawn advance.
- Petrov's Defense, Classical AttackA main Petrov line in which the e-pawns are exchanged and White occupies the center with d4 to challenge the knight on e4.
- Petrov's Defense, Cochrane GambitA knight sacrifice that exposes the black king and seeks immediate activity in the center.
- Petrov's Defense, Modern AttackA system in which White challenges the center with a pawn before capturing Black’s advanced central pawn.
- Petrov's Defense, Stafford GambitA gambit in which Black offers a pawn to bring the pieces out quickly and create threats against the white king.
- Philidor Defense, Hanham VariationA compact system in which Black supports an advanced central pawn and places a knight behind it.
- Philidor Defense, Lion VariationA Philidor system in which Black places both knights around two central pawns that support each other.
- Ponziani Opening, Jaenisch CounterattackAn active Ponziani reply in which Black brings out a knight and immediately attacks White’s central pawn.
- Ruy Lopez, Bird VariationA Ruy Lopez defense in which Black moves the same knight twice, centralizes it, and attacks White’s bishop.
- Ruy Lopez, Classical VariationAn active defense in which Black aims the bishop at a pawn near White’s king before moving the king knight.
- Ruy Lopez, Cozio DefenseA flexible defense in which one black knight supports the other and prepares to reorganize later.
- Ruy Lopez, Modern Steinitz DefenseA system in which Black first challenges White’s bishop and then supports the center, gaining solidity but less space.
- Ruy Lopez, Morphy DefenseA fundamental reply that attacks White’s bishop and makes it choose between capturing the knight and retreating.
- Ruy Lopez, Neo-Arkhangelsk VariationAn active system in which Black gains space on the side where the queens begin and activates the bishop against the center and king.
- Ruy Lopez, Schliemann DefenseAn aggressive reply in which Black advances a pawn beside the king to attack White’s center and create immediate threats.
- Ruy Lopez, Steinitz DefenseA Ruy Lopez variation in which Black plays 3...d6 to support the e5-pawn immediately.
- Ruy Lopez, Worrall AttackA Closed Ruy Lopez system where White plays 6.Qe2 to support e4 and keep the rook available for d1.
- Scotch Game, Classical VariationA Scotch Game branch where Black develops with 4...Bc5 and immediately puts pressure on White's central knight on d4.
- Scotch Game, Göring GambitA Scotch Game gambit where White plays 4.c3, offering a pawn for rapid development and open lines.
- Scotch Game, Mieses VariationA Scotch line where 4...Nf6 attacks e4 and White answers with Nxc6 and e5 to gain space.
- Vienna Game, Frankenstein-Dracula VariationA Vienna Game line with early forcing threats and captures, beginning with Black's risky 3...Nxe4.
Semi-open games
77- Sicilian DefenseAn opening family defined by 1.e4 c5, where Black contests the center with a flank pawn.
- Sicilian Defense, Najdorf VariationAn Open Sicilian variation in which Black plays ...a6 to control b5 and preserve several possible central structures.
- Sicilian Defense, Dragon VariationAn Open Sicilian variation in which Black plays ...g6 to develop the bishop through g7 onto the long diagonal.
- Sicilian Defense, Accelerated DragonA Sicilian variation that prepares ...Bg7 without first playing ...d6, aiming to free the center with ...d5 in one move.
- Sicilian Defense, Classical VariationAn Open Sicilian variation in which Black develops both knights to f6 and c6 before committing the central pawn structure.
- Sicilian Defense, Sveshnikov VariationA dynamic Sicilian system where Black plays an early ...e5, gains space, and accepts a lasting weakness on d5.
- Sicilian Defense, Kalashnikov VariationA Sicilian variation in which Black plays ...e5 before developing the knight from g8.
- Sicilian Defense, Taimanov VariationA flexible Sicilian system with ...e6 and ...Nc6, designed to develop pieces and prepare the freeing ...d5 break.
- Sicilian Defense, Kan VariationA flexible Sicilian variation where Black plays ...e6 and ...a6 before deciding how to place the knights.
- Sicilian Defense, Scheveningen VariationA Sicilian system with black pawns on d6 and e6, a compact center, and counterplay on either wing.
- Sicilian Defense, Rossolimo VariationA response to 2...Nc6 where White develops the bishop to b5 and postpones opening the center with d4.
- Sicilian Defense, Alapin VariationAn anti-Sicilian system where White plays c3 to prepare a strong pawn center with d4.
- Smith-Morra GambitA gambit against the Sicilian where White offers a pawn for rapid development and open central lines.
- Grand Prix AttackAn aggressive anti-Sicilian plan where White plays f4 to gain space and prepare an attack on the king.
- Closed SicilianA family of positions beginning with 2.Nc3 where White usually delays d4 and builds the position more gradually.
- French DefenseA defense to 1.e4 where Black prepares ...d5 with ...e6 and challenges White's center from move two.
- French Defense, Advance VariationA variation where White plays 3.e5, gains space, and fixes a pawn chain that Black will try to attack.
- French Defense, Tarrasch VariationA variation with 3.Nd2 that protects e4, leaves the c-pawn free, and avoids the typical Winawer position with a knight on c3.
- French Defense, Winawer VariationA sharp variation with 3...Bb4, where Black pins the c3-knight and creates early structural imbalance.
- French Defense, Classical VariationA variation with 3...Nf6 where Black develops a knight and increases pressure on e4 without resolving the center.
- French Defense, Rubinstein VariationA solid variation where Black exchanges on e4 early, simplifies the center, and accepts less space.
- Caro-Kann DefenseA solid defense where Black uses a side pawn to support the advance of the pawn in front of the queen and challenge the center.
- Caro-Kann Defense, Panov AttackAn aggressive Caro-Kann line where one of White's side pawns immediately attacks Black's central pawn.
- Caro-Kann Defense, Exchange VariationA line where White trades a central pawn and Black recaptures with a flank pawn, simplifying the center.
- Caro-Kann Defense, Two Knights VariationA system where White brings out both knights early and delays advancing the pawn that starts in front of the queen.
- Scandinavian DefenseA defense where Black immediately challenges the pawn in front of White's king with the pawn in front of Black's queen.
- Modern DefenseA flexible defense where Black allows White a broad pawn center and attacks it later from a distance.
- Pirc DefenseA defense where Black allows White a broad center and attacks it later with pieces and pawn advances.
- Alekhine DefenseA defense where a black knight attacks the pawn in front of White's king and invites the white pawns forward so they may become targets.
- Owen's DefenseAn uncommon defense where Black prepares the bishop that starts beside the queen on a long diagonal against White's center.
- Nimzowitsch DefenseA flexible defense where Black moves the knight beside the queen first and waits before deciding how to challenge the center.
- Open SicilianA family of Sicilian lines where White advances the pawn in front of the queen early and trades it for Black's c-pawn.
- Sicilian Defense, Moscow VariationA Sicilian system where White gives an early check with the bishop beside the king before opening the center.
- French Defense, Exchange VariationA line where White exchanges central pawns and leaves a symmetrical pawn arrangement.
- Caro-Kann Defense, Advance VariationA line where White advances the pawn in front of the king again, gains territory, and forms a pawn chain.
- Caro-Kann Defense, Classical VariationA common line where Black exchanges the pawn in front of White's king and brings out the bishop beside the queen before closing its diagonal.
- Alekhine Defense, Exchange VariationAn Alekhine Defense variation where White's e5-pawn captures on d6 and resolves the central tension early.
- Alekhine Defense, Four Pawns AttackAn ambitious Alekhine system where White occupies the center with pawns on e5, d4, c4, and f4.
- Alekhine Defense, Modern VariationAn Alekhine variation where White plays 4.Nf3, developing a piece and supporting the advanced e5-pawn.
- Caro-Kann Defense, Accelerated Panov AttackA Caro-Kann system where White plays 2.c4 and challenges d5 before establishing a pawn on d4.
- Caro-Kann Defense, Advance Variation, Short VariationAn Advance Caro-Kann line where White plays 4.Nf3 to develop and support the e5-pawn.
- Caro-Kann Defense, Advance Variation, Tal VariationAn aggressive Advance line where White plays 4.h4 to disturb the f5-bishop and gain kingside space.
- Caro-Kann Defense, Bronstein-Larsen VariationA Caro-Kann variation where ...gxf6 creates doubled pawns and a half-open g-file in return for attacking chances.
- Caro-Kann Defense, Fantasy VariationA White system against the Caro-Kann where 3.f3 supports e4 and prepares an f-pawn recapture if Black exchanges.
- Caro-Kann Defense, Gurgenidze SystemA Caro-Kann system where Black plays 3...g6 and prepares the bishop on g7 to pressure White's center.
- Caro-Kann Defense, Karpov VariationA Caro-Kann variation where Black plays 4...Nd7 to prepare ...Ngf6 without necessarily damaging the pawn structure.
- Caro-Kann Defense, Tartakower VariationA Caro-Kann variation where ...exf6 creates doubled pawns, keeps the g-pawn in place, and opens the e-file.
- Czech DefenseA Pirc-family system where Black plays ...c6 to support d5, control b5, and prepare central pawn breaks.
- French Defense, Advance Variation, Milner-Barry GambitA gambit in which White offers the d4-pawn to bring the pieces out quickly and create threats against the black king.
- French Defense, Alekhine-Chatard AttackAn attacking gambit beginning with 6.h4, in which White offers a pawn to open lines against the black king.
- French Defense, Classical Variation, Burn VariationA line in which Black plays 4...dxe4 to exchange the central pawn and give the pieces more freedom.
- French Defense, McCutcheon VariationA sharp response to 4.Bg5 in which Black plays 4...Bb4 and pins the c3-knight to the king.
- French Defense, Rubinstein Variation, Fort Knox VariationA solid system in which Black exchanges the central pawn early and brings the c8-bishop out through ...Bd7 and ...Bc6.
- French Defense, Steinitz VariationA variation in which White advances e5 after Nc3 and builds a pawn center that Black attacks with ...c5 and ...f6.
- French Defense, Tarrasch Variation, Guimard DefenseA response to 3.Nd2 in which Black brings out the b8-knight with 3...Nc6 and prepares pressure against White's center.
- French Defense, Winawer Variation, Poisoned Pawn VariationA highly concrete line in which White's queen takes pawns near Black's king while Black attacks the queen and White's center.
- Modern Defense, Averbakh SystemA system in which White builds a broad center with pawns on c4, d4, and e4 while Black prepares a counterattack.
- Pirc Defense, 150 AttackAn attacking system with Be3 and Qd2 in which White often castles long and advances pawns toward the black king.
- Pirc Defense, Austrian AttackAn aggressive line defined by 4.f4, with which White builds a large center and prepares the e5 advance.
- Pirc Defense, Classical VariationA flexible system with 4.Nf3 in which White brings out the second knight and keeps the central pawns on d4 and e4.
- Scandinavian Defense, Icelandic-Palme GambitA gambit in which Black offers the e6-pawn to bring pieces out quickly and open the center after 2...Nf6.
- Scandinavian Defense, Main LineAn immediate-recapture line in which Black takes on d5 with the queen and retreats to a5 after Nc3.
- Scandinavian Defense, Modern VariationA branch defined by 2...Nf6, with which Black brings out a knight and delays recovering the d5-pawn.
- Scandinavian Defense, Portuguese GambitA gambit with 3...Bg4 in which Black delays recovering the d5-pawn to bring out the bishop and create pressure.
- Sicilian Defense, Chekhover VariationA variation in which White recaptures on d4 with the queen instead of the knight and avoids many main branches.
- Sicilian Defense, Dragon Variation, Levenfish VariationAn attack against the Dragon defined by 6.f4, with which White prepares e5 and a rapid pawn advance toward the black king.
- Sicilian Defense, Dragon Variation, Yugoslav AttackAn aggressive system against the Dragon in which White prepares to place the king on c1 and advance pawns toward Black's king.
- Sicilian Defense, Four Knights VariationA Sicilian line in which both sides develop both knights quickly while preserving several choices for their central pawns.
- Sicilian Defense, Hyperaccelerated DragonA Sicilian move order in which Black plays 2...g6 to open a path for the f8-bishop toward g7.
- Sicilian Defense, Najdorf Variation, English AttackA system against the Najdorf beginning with Be3 and often followed by f3, Qd2, and a pawn attack against Black's king.
- Sicilian Defense, Najdorf Variation, Poisoned Pawn VariationA Najdorf branch full of concrete threats in which Black's queen captures on b2 and accepts danger in return for a pawn.
- Sicilian Defense, O'Kelly VariationA Sicilian line defined by 2...a6, a flexible move that controls b5 and prepares expansion on the queen's side.
- Sicilian Defense, Richter-Rauzer VariationAn aggressive system against the Classical Sicilian in which Bg5 pressures the f6-knight and helps White bring pieces into play quickly.
- Sicilian Defense, Scheveningen Variation, Keres AttackA direct attack against the Scheveningen beginning with 6.g4 and preparing g5 to drive away the f6-knight.
- Sicilian Defense, Sozin AttackA Sicilian system in which White moves the bishop from f1 to c4 to pressure f7 and accelerate attacking play.
- Sicilian Defense, Velimirović AttackA highly aggressive Sozin continuation with Bc4, Be3, and Qe2, usually aimed at placing White's king on c1 and attacking Black's king.
- Sicilian Defense, Wing GambitA gambit in which White offers 2.b4 to deflect the c5-pawn and build a broad center with d4.
Queen's Pawn and Indian systems
106- Queen's GambitAn opening where White attacks Black's central pawn with the pawn that starts in front of the bishop beside the queen.
- Queen's Gambit AcceptedA Queen's Gambit variation in which Black captures White's offered c4-pawn with the pawn from d5.
- Queen's Gambit DeclinedA Queen's Gambit response in which Black does not capture on c4 and supports the central d5-pawn with ...e6.
- Queen's Gambit Declined, Orthodox DefenseA classical Queen's Gambit Declined line in which Black develops with ...Be7, ...O-O, and ...Nbd7 before resolving the center.
- Queen's Gambit Declined, Lasker DefenseA Queen's Gambit Declined line in which Black plays ...h6 and ...Ne4 to exchange pieces and free the position.
- Queen's Gambit Declined, Tartakower VariationA Queen's Gambit Declined line in which Black plays ...h6 and ...b6 to activate the c8-bishop through b7.
- Cambridge Springs DefenseA Queen's Gambit Declined line in which Black plays ...Qa5 to create tactical pressure along the a5-e1 diagonal.
- Semi-Slav DefenseA defense to the Queen's Gambit in which Black supports d5 with pawns on both c6 and e6.
- Semi-Slav Defense, Meran VariationA Semi-Slav line in which Black captures on c4 after Bd3 and gains queenside space with ...b5 while developing.
- Semi-Slav Defense, Botvinnik VariationA very sharp Semi-Slav line in which Black captures on c4 and White builds a large center with e4.
- Semi-Slav Defense, Moscow VariationA Semi-Slav line in which White answers ...h6 by exchanging the g5-bishop for the f6-knight and Black's queen recaptures.
- Anti-Moscow GambitA sharp Semi-Slav line in which White retreats the bishop to h4 and offers a pawn for a strong center and attacking activity.
- Slav DefenseA defense to the Queen's Gambit in which Black protects the d5-pawn with the pawn move ...c6.
- Slav Defense, Chebanenko VariationA flexible Slav variation in which Black plays ...a6 to prepare ...b5 while keeping several pawn structures available.
- Queen's Pawn GameA broad name for openings that begin with White advancing the pawn from d2 to d4.
- London SystemAn opening system with d4 and an early development of the c1-bishop to f4 before e3 closes its diagonal.
- Colle SystemAn opening system with d4, e3, Nf3, Bd3, and c3 that prepares the central advance e4.
- Torre AttackA White setup with d4, Nf3, and Bg5 that emphasizes easy development and pressure on the center and kingside.
- Trompowsky AttackAn opening with 1.d4 and an early Bg5 that attacks the f6-knight and tries to unbalance the game immediately.
- Richter-Veresov AttackA d4 opening with Nc3 and Bg5 in which White develops quickly and often prepares the central e4 pawn push.
- Blackmar-Diemer GambitA queen's-pawn gambit in which White offers material to accelerate development and open attacking lines.
- Catalan OpeningA d4 and c4 opening in which White prepares Bg2 to create long-term pressure along the long diagonal.
- Catalan Opening, Open DefenseThe Catalan branch in which Black captures the c4-pawn and accepts pressure in return for the extra pawn.
- Catalan Opening, ClosedThe Catalan branch in which Black keeps the d5-pawn and builds a compact central position instead of capturing on c4.
- Bogo-Indian DefenseA defense to d4 in which Black develops the bishop to b4 with check after White's king knight has moved to f3.
- Queen's Indian DefenseA defense to d4 in which Black prepares ...Bb7 with ...b6 and controls the center with pieces rather than occupying it immediately.
- Nimzo-Indian DefenseA defense to d4 in which ...Bb4 pins the c3-knight and pressures White's center without filling it with black pawns.
- King's Indian DefenseA defense to d4 in which Black allows White to build a large pawn center and later challenges it with moves such as ...e5 or ...c5.
- King's Indian Defense, Sämisch VariationA King's Indian variation where White plays f3 to reinforce e4 and prepare an aggressive expansion.
- King's Indian Defense, Fianchetto VariationA King's Indian variation where White develops the bishop to g2 for king safety and long-range pressure.
- King's Indian Defense, Four Pawns AttackA variation where White places pawns on c4, d4, e4, and f4 to gain major space and dominate the center.
- Grünfeld DefenseA defense to d4 in which Black plays an early ...d5 and challenges White's pawn center immediately.
- Grünfeld Defense, Russian VariationA Grünfeld variation where White plays Qb3 to defend c4, pressure d5, and support a broad pawn center.
- Benoni DefenseA family of defenses in which Black challenges White's center after d4, usually with ...c5.
- Modern BenoniA Benoni branch in which Black challenges White's center with ...c5 and ...e6, accepting less central space in return for active play.
- Benko GambitAn opening where Black offers a pawn on the queen's side of the board to open lines and create lasting pressure.
- Blumenfeld CountergambitAn active Black pawn offer combining central pressure with an advanced c-pawn and a b-pawn push.
- Budapest GambitAn opening where Black offers an early central pawn to displace White's queen pawn, develop with threats, and try to regain the material.
- Old Indian DefenseA queen-pawn defense where Black builds a compact setup, prepares a central challenge with the e-pawn, and commonly develops the king-side bishop to e7.
- Stonewall AttackA White opening system that builds a rigid pawn chain to support a central knight and prepare direct play against Black's king.
- Queen's Gambit Declined, Exchange VariationA variation where White trades the c-pawn for Black's central d-pawn, creating the asymmetric Carlsbad pawn structure.
- Tarrasch DefenseAn active Queen's Gambit defense where Black challenges the center early and often accepts a central pawn without support from neighboring pawns.
- Semi-Tarrasch DefenseA Queen's Gambit defense where Black develops the king-side knight before challenging the center with the c-pawn, often enabling a knight recapture.
- Ragozin DefenseA Queen's Gambit Declined defense combining a solid center with a bishop pin on White's knight to increase central pressure.
- Chigorin DefenseA Queen's Gambit defense where Black develops the queen-side knight early and pressures the center with pieces instead of reinforcing it with pawns.
- Albin CountergambitAn aggressive Queen's Gambit reply where Black offers a central pawn and seeks activity through a deeply advanced queen pawn.
- Slav Defense, Exchange VariationA Slav variation where White trades the c-pawn for Black's d-pawn and Black recaptures with the c-pawn.
- King's Indian Defense, Classical VariationA major King's Indian line where White builds a broad center while Black prepares pawn advances that attack it.
- Grünfeld Defense, Exchange VariationA Grünfeld line where White removes a central black pawn and builds a broad pawn center that Black immediately tries to attack.
- Barry AttackA system with d4, Nf3, Nc3, and Bf4 that brings pieces out easily and creates pressure against ...g6 and ...d5 setups.
- Benko Gambit AcceptedThe Benko branch in which White captures on b5 and wins a pawn while Black gains lasting pressure.
- Benko Gambit DeclinedA family of responses in which White does not capture the b5-pawn and avoids the positions created by accepting it.
- Black Knights' TangoA flexible defense to 1.d4 in which Black moves both knights before deciding how to advance the central pawns.
- Blackmar-Diemer Gambit AcceptedA line in which Black captures on e4 and then f3, while White remains a pawn down to bring pieces out quickly and create threats.
- Blackmar-Diemer Gambit DeclinedA family of lines in which Black takes on e4 but declines to capture the pawn offered on f3.
- Bogo-Indian Defense, Nimzowitsch VariationA Bogo-Indian line in which White blocks the check with Bd2 and Black supports the bishop with ...Qe7.
- Bogo-Indian Defense, Retreat VariationA Bogo-Indian branch in which Black gives a bishop check and, after White blocks it, retreats without exchanging.
- Budapest Gambit, Fajarowicz VariationA Budapest Gambit line where Black centralizes a knight to create quick threats instead of immediately recovering the offered pawn.
- Colle-Zukertort SystemA White system that uses a stable piece-and-pawn setup and brings the dark-squared bishop onto a long diagonal.
- Czech BenoniA defense to the queen pawn where Black places a pawn on e5 and normally builds pawn chains that close the center.
- English DefenseA defense to the queen pawn where Black brings a bishop onto a long diagonal and later attacks White's central pawns.
- Englund GambitAn immediate gambit against the queen pawn in which Black offers a pawn to bring pieces out quickly and create threats.
- Grünfeld Defense, Brinckmann AttackA response to the Grünfeld where White moves the bishop beside the queen out early, before pawns can close its diagonal.
- Grünfeld Defense, Three Knights VariationA Grünfeld variation in which both white knights and one black knight leave their starting squares early.
- Indian DefenseThe broad name for an opening family in which Black answers the queen pawn by moving the kingside knight out first.
- Jobava London SystemA White system combining the usual London bishop placement with an early, active move by the knight beside the queen.
- King's Indian Defense, Averbakh VariationA King's Indian variation where White actively places the queenside bishop to restrain Black's central pawn advance.
- King's Indian Defense, Bayonet AttackA King's Indian branch where White rapidly advances pawns on the side where the queen began.
- King's Indian Defense, Gligorić-Taimanov SystemA King's Indian system where White moves the bishop beside the queen out before deciding whether to lock the center.
- King's Indian Defense, Makogonov VariationA King's Indian variation where White advances the h-pawn early to control a square used by Black's knight.
- King's Indian Defense, Mar del Plata VariationA closed King's Indian line where White advances on the side where the queen began and Black advances on the side where the king began.
- King's Indian Defense, Petrosian VariationA King's Indian variation where White locks the center before securing the king and tries to restrict Black's play.
- King's Indian Defense, Sämisch Variation, Panno FormationA Black formation against the Sämisch that prepares expansion and pressure on the side where the queens began.
- Levitsky AttackA White opening that moves the bishop beside the queen out very early to influence how Black organizes the pieces.
- Modern Benoni, Classical VariationA Modern Benoni line in which White develops quickly and keeps several ways to use the central space advantage.
- Modern Benoni, Fianchetto VariationA Modern Benoni line where White develops the king's bishop to g2 to reinforce the center and shelter the king.
- Modern Benoni, Taimanov VariationA critical Modern Benoni line where White advances the f-pawn and gives an early bishop check from b5.
- Neo-Grünfeld DefenseAn opening family where White develops the king's knight first and Black answers with a fianchetto and a central d5 strike.
- Nimzo-Indian Defense, Classical VariationA Nimzo-Indian variation where White's queen goes to c2 to support e4 and prepare a queen recapture on c3.
- Nimzo-Indian Defense, Gligorić SystemA Nimzo-Indian system where White develops with e3, a knight on f3, and a bishop on d3 while Black attacks the center.
- Nimzo-Indian Defense, Hübner VariationA Nimzo-Indian line where Black exchanges the bishop for the c3-knight, damages White's structure, and aims to close the center.
- Nimzo-Indian Defense, Kmoch VariationAn ambitious Nimzo-Indian variation where White advances the f-pawn to prepare a broad center with e4.
- Nimzo-Indian Defense, Leningrad VariationA Nimzo-Indian variation where White develops the dark-squared bishop to g5 before restricting it with e3.
- Nimzo-Indian Defense, Romanishin VariationA flexible Nimzo-Indian variation where White advances the g-pawn and prepares the king's bishop for g2.
- Nimzo-Indian Defense, Rubinstein SystemA broad Nimzo-Indian system defined by the e3 advance, a solid move that frees the king's bishop and permits flexible development.
- Nimzo-Indian Defense, Sämisch VariationA Nimzo-Indian variation where White advances the a-pawn, invites the exchange on c3, and accepts doubled pawns for two bishops.
- Nimzo-Indian Defense, Spielmann VariationA Nimzo-Indian variation where White's queen goes to b3 to attack Black's bishop on b4 immediately.
- Nimzo-Indian Defense, St. Petersburg VariationA Nimzo-Indian variation where Black answers e3 with b6 and prepares to develop the queen's bishop on b7.
- Nimzo-Indian Defense, Three Knights VariationA Nimzo-Indian variation where White develops the king's knight to f3 before fixing the central pawn structure.
- Old BenoniAn opening where Black answers d4 immediately with the c-pawn to c5 and creates an unbalanced structure.
- Queen's Gambit Accepted, Central VariationA Queen's Gambit Accepted line where White advances the e-pawn to e4 and immediately builds a broad center.
- Queen's Gambit Accepted, Classical DefenseA main Queen's Gambit Accepted line where both sides develop, White recovers c4, and Black attacks d4 with c5.
- Queen's Gambit Declined, Baltic DefenseA defense in which Black develops the c8-bishop to f5 before supporting the central d5-pawn with the e-pawn.
- Queen's Gambit Declined, Harrwitz AttackA Queen's Gambit Declined system defined by White's early development of the c1-bishop to f4.
- Queen's Gambit Declined, Janowski VariationA variation where Black advances the a7-pawn to a6 early, preparing a capture on c4 that the b-pawn can support.
- Queen's Gambit Declined, Vienna VariationA Three Knights line where Black captures on c4 and challenges White to build or recover the center.
- Queen's Indian Defense, Classical VariationA line in which both sides develop a bishop on a long diagonal before deciding how to occupy or challenge the center.
- Queen's Indian Defense, Fianchetto VariationA White system that prepares the bishop on g2 to control a long diagonal, support the center, and help secure the king.
- Queen's Indian Defense, Kasparov VariationA line where White immediately develops the b1-knight to c3 and allows Black’s bishop to move to b4.
- Queen's Indian Defense, Petrosian VariationA White system that advances the a2-pawn to a3, preventing Black’s bishop from reaching b4 and preparing the knight on c3.
- Queen's Indian Defense, Spassky SystemA flexible system that advances the e2-pawn to e3, frees the f1-bishop, and helps White secure the king quickly.
- Semi-Slav Defense, Chigorin DefenseA Semi-Slav line where Black’s f8-bishop goes to d6 to support a central advance and help secure the king quickly.
- Semi-Slav Defense, Marshall GambitAn aggressive line where White offers the e4-pawn to open the center against Black’s pawns on c6, d5, and e6.
- Semi-Slav Defense, Noteboom VariationA line from Black’s c6, d5, and e6 pawn setup where Black captures on c4 and seeks two neighboring advancing pawns.
- Semi-Slav Defense, Stoltz VariationA Semi-Slav line where White’s queen goes to c2 to support e4 and delay the decision about the f1-bishop.
- Slav Defense, Czech VariationA classical Slav line where Black captures on c4 and develops the c8-bishop to f5 before advancing the e7-pawn.
Flank openings and other systems
36- King's Indian AttackA White opening system that develops a knight early, prepares the kingside bishop on a long diagonal, and delays a direct central pawn confrontation.
- King's Fianchetto OpeningA flexible opening where White immediately prepares a long diagonal for the kingside bishop while keeping the central pawns uncommitted.
- English OpeningA flank opening where White begins with a queenside pawn to control the center from the side while preserving several central options.
- Réti OpeningA flexible opening family where White often develops the kingside knight first, pressuring the center without immediately occupying it with pawns.
- Bird OpeningAn opening where White advances a kingside pawn immediately to control a central square and gain space, while accepting some weaknesses.
- Dutch DefenseAn active defense where Black answers White's queen-pawn advance by pushing a kingside pawn to contest the center.
- Dutch Defense, Classical VariationA Dutch Defense branch where Black develops the kingside bishop directly rather than on the long flank diagonal, while keeping central flexibility.
- Dutch Defense, Leningrad VariationA Dutch Defense branch combining an early pawn advance on the king's side with the kingside bishop on a long diagonal.
- Dutch Defense, Stonewall VariationA Dutch Defense branch built around a fixed wall of four pawns that controls central squares, gains space, and restricts some of Black's pieces.
- Polish OpeningAn opening where White advances a queenside pawn two squares to gain space and prepare the bishop on a long diagonal.
- Larsen's OpeningA flexible opening where White advances a queenside pawn one square to prepare the bishop on a long diagonal.
- Grob OpeningAn irregular opening where White advances a kingside pawn two squares, gaining space but immediately weakening the area around the king.
- Hippopotamus DefenseA flexible defensive system where Black keeps many pieces and pawns near their starting area, concedes central space, and waits to counterattack.
- Bird Opening, From's GambitA reply to Bird’s Opening in which Black advances the e7-pawn to e5 and offers it for rapid development and an attack on White’s king.
- Dutch Defense, Hopton AttackA reply to the Dutch Defense where White’s c1-bishop goes to g5 and questions Black’s natural knight development.
- Dutch Defense, Ilyin-Zhenevsky VariationA Classical Dutch system where Black’s queen goes to e8 to support the e6-pawn’s advance to e5 and a possible king attack.
- Dutch Defense, Staunton GambitAn aggressive line where White advances the e2-pawn to e4 and offers it to open the center against the Dutch Defense.
- English Opening, Agincourt DefenseA flexible reply to 1.c4 in which Black plays ...e6 and usually prepares ...d5.
- English Opening, Anglo-Dutch DefenseThe reply 1...f5 to the English Opening, controlling e4 and seeking active play in the center and on the king's side.
- English Opening, Anglo-Grünfeld DefenseAn English Opening system where Black develops the knight to f6 and challenges the center early with ...d5.
- English Opening, Anglo-Indian DefenseA flexible family beginning when Black answers 1.c4 by developing the king's knight to f6.
- English Opening, Anglo-Scandinavian DefenseThe immediate reply 1...d5 to the English Opening, creating a direct clash between the c4-pawn and d5-pawn.
- English Opening, Carls-Bremen SystemAn English setup with c4, Nc3, and g3 against ...e5 and ...Nf6, preparing to develop the bishop on g2.
- English Opening, King's English VariationThe major English Opening family beginning when Black answers 1.c4 with ...e5.
- English Opening, King's English Variation, Botvinnik SystemAn English setup with White's pawns on c4, d3, and e4, a knight on c3, and the bishop developed to g2.
- English Opening, King's English Variation, Four Knights VariationA King's English branch where both sides develop both knights toward the center.
- English Opening, King's English Variation, Reversed Closed SicilianA closed, maneuvering branch of 1.c4 e5 that resembles a Closed Sicilian with the colors exchanged.
- English Opening, Mikenas-Carls VariationAn ambitious system where White combines c4 and Nc3 with an early e4 to occupy a large share of the center.
- English Opening, Neo-CatalanAn English or Réti move order with c4, Nf3, and g3 against ...e6 and ...d5 while White's d-pawn remains uncommitted.
- English Opening, Symmetrical VariationThe English Opening branch beginning with 1.c4 c5, where Black mirrors White's c-pawn advance.
- Réti Opening, Advance VariationA Réti branch where Black answers White's c4 challenge by advancing the d-pawn from d5 to d4.
- Réti Opening, Anglo-Slav VariationA Réti family against Black's ...c6 and ...d5 structure, with White normally delaying the advance d4.
- Réti Opening, Réti AcceptedA Réti branch where Black accepts the pawn offer by capturing on c4 with the d-pawn.
- Van Geet OpeningAn opening beginning with 1.Nc3, developing the queen's knight without committing a central pawn.
- Zukertort OpeningThe general name for openings beginning with 1.Nf3 before White defines the pawn structure.
- Zukertort Opening, Lisitsyn GambitA gambit beginning with 1.Nf3 f5 2.e4, where White offers a pawn to gain faster activity.