Master the main chess lines with direct explanations, plans for White and Black, frequent mistakes and training with Stockfish 18.
1.e4 c5
The Sicilian Defense (1.e4 c5) is the sharpest and most popular answer to 1.e4. Black fights for the centre from the queenside, unbalancing the pawn structure and producing dynamic games with a high share of decisive results.
See the full guide and plans1.e4 e6 2.d4 d5
The French Defense (1.e4 e6 2.d4 d5) is defined by a solid, closed central pawn chain in which Black attacks the base of White's chain on d4 with ...c5, ...Nc6 and ...Qb6.
See the full guide and plans1.e4 c6 2.d4 d5
The Caro-Kann Defense (1.e4 c6 2.d4 d5) puts structural solidity first, letting Black develop the light-squared bishop to f5 before closing the pawn chain with ...e6.
See the full guide and plans1.e4 d5
The Scandinavian Defense (1.e4 d5) challenges White's central pawn on move one. Black aims for quick simplification and open piece lines, retreating the queen to safety or manoeuvring with ...Nf6.
See the full guide and plans1.e4 d6 2.d4 Nf6 3.Nc3 g6
The Pirc Defense (1.e4 d6 2.d4 Nf6 3.Nc3 g6) is a flexible, hypermodern reply. Black concedes the pawn centre to White and then counterattacks it with the fianchettoed bishop on g7 and the ...c5 or ...e5 breaks.
See the full guide and plans1.e4 Nf6
Invented by World Champion Alexander Alekhine, the Alekhine Defense (1.e4 Nf6) provokes White's pawns forward with e5 and d4, aiming to overextend the enemy centre and turn it into a target.
See the full guide and plans1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5
The Italian Game develops the minor pieces quickly and aims at Black's vulnerable f7 square, allowing both deeply positional lines (the Giuoco Pianissimo with d3 and c3) and blistering attacks (the Evans Gambit).
See the full guide and plans1.e4 e5 2.Nf3 Nc6 3.Bb5
Widely regarded as the queen of the open games, the Ruy Lopez (1.e4 e5 2.Nf3 Nc6 3.Bb5) pressures the central e5 pawn indirectly by attacking its defender on c6. It has been the opening of choice of virtually every world champion.
See the full guide and plans1.e4 e5 2.f4
The King's Gambit (1.e4 e5 2.f4) is the emblem of the romantic era of chess. White sacrifices the f-pawn on move two to deflect Black's e5 pawn, open the f-file and build a huge centre.
See the full guide and plans1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4
The Scotch Game (3.d4) opens the centre immediately on move three, sidestepping the vast theory of the Ruy Lopez and giving White open play with free diagonals for the bishops. It was one of Garry Kasparov's favourite weapons in world championship matches.
See the full guide and plans1.e4 e5 2.Nf3 Nf6
The Petrov Defense (1.e4 e5 2.Nf3 Nf6) counterattacks the e4 pawn at once instead of defending e5 passively. It is famous for its impenetrable solidity in world championship matches, and is the elite choice for neutralising White's initiative.
See the full guide and plans1.d4 d5 2.Bf4 Nf6 3.e3 c5 4.c3
The London System is one of the most popular openings in the world thanks to its solid pyramid structure (pawns on c3, d4, e3) and how easily it develops the bishop safely to f4 before the pawn chain closes.
See the full guide and plans1.d4 d5 2.c4 e6 3.Nc3 Nf6
The Queen's Gambit Declined (1.d4 d5 2.c4 e6) is the cornerstone of closed-opening theory. Black props up the central d5 pawn with ...e6, setting up a formidable defence and challenging White to find long-term plans.
See the full guide and plans1.d4 d5 2.c4 dxc4
In the Queen's Gambit Accepted (1.d4 d5 2.c4 dxc4) Black takes the temporarily offered pawn, conceding the centre to White in order to focus on quick development and counterplay against White's centre with ...c5 or ...e5.
See the full guide and plans1.d4 d5 2.c4 c6
The Slav Defense (1.d4 d5 2.c4 c6) supports the central d5 point with the c-pawn, keeping the c8-h3 diagonal open so the light-squared bishop can develop naturally before ...e6 shuts the position.
See the full guide and plans1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2
The Catalan Opening combines the Queen's Gambit with a fianchetto of the light-squared bishop on g2. The mighty Catalan bishop exerts enormous pressure along the h1-a8 diagonal, paralysing Black's queenside.
See the full guide and plans1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6
The King's Indian Defense (KID) is the favourite weapon of hypermodern, aggressive players such as Garry Kasparov and Bobby Fischer. Black hands White the early centre and then attacks it with ...e5 and an avalanche of kingside pawns.
See the full guide and plans1.d4 Nf6 2.c4 g6 3.Nc3 d5
The Grünfeld Defense (1.d4 Nf6 2.c4 g6 3.Nc3 d5) challenges White's centre immediately with ...d5. When White captures and builds a big centre with e4, Black uses ...c5, ...Bg7 and ...Qa5 to bombard and demolish it.
See the full guide and plans1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
Developed by Aron Nimzowitsch, the Nimzo-Indian Defense (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4) pins the c3 knight and stops White from playing e4. Black seeks a firm positional grip on the central squares and often doubles White's pawns with ...Bxc3+.
See the full guide and plans1.d4 f5
The Dutch Defense (1.d4 f5) fights for control of the e4 square from move one. Black looks for asymmetric, combative play, generating strong kingside attacks through the Leningrad Variation or the Stonewall structure.
See the full guide and plans1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6
The Modern Benoni (1.d4 Nf6 2.c4 c5 3.d5 e6) produces one of the sharpest structural imbalances in chess. White gets a central pawn majority (e4/d5) while Black gets a queenside majority (a6/b5) and huge activity from the g7 bishop.
See the full guide and plans1.c4
The English Opening (1.c4) controls the central d5 square from the flank. It is highly flexible and can transpose into the Queen's Gambit, the Catalan, a Reversed Sicilian (1...e5) or closed systems full of deep manoeuvring.
See the full guide and plans1.Nf3 d5 2.c4
Created by the hypermodern master Richard Réti, the Réti Opening (1.Nf3 d5 2.c4) attacks the central d5 pawn from the flank without occupying the centre with its own pawns, combining minor-piece pressure with double fianchettos.
See the full guide and plans1.f4
Bird's Opening (1.f4) takes control of the central e5 square on move one. It is the Dutch Defense with colours reversed, leading to asymmetric games outside the classical books, with clear kingside attacking plans.
See the full guide and plans1.e4 g6 2.d4 Bg7 3.Nc3 d6
The Modern Defense lets White occupy the centre so Black can attack it later with fianchettoed pieces and breaks such as ...c5 or ...e5. By delaying the g8 knight, Black keeps maximum flexibility and can transpose into Pirc or King's Indian structures.
See the full guide and plans1.e4 c5 2.Nc3 Nc6 3.g3
In the Closed Sicilian, White avoids the immediate d4 exchange and builds a kingside attack with g3, Bg2 and f4. Black usually replies with queenside expansion and central pressure.
See the full guide and plans1.e4 c5 2.c3
The Alapin Variation prepares d4 to build a pawn centre and cuts down the amount of Open Sicilian theory. In exchange, the b1 knight temporarily loses its natural square on c3.
See the full guide and plans1.e4 e5 2.Nc3
The Vienna Game develops the b1 knight while keeping the f-pawn free for an aggressive advance. It blends the positional ideas of the Italian with the attacks typical of the King's Gambit.
See the full guide and plans1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6
The Four Knights Game develops the minor pieces naturally and fights for the centre without immediate risk. Despite the symmetrical look, lines such as the Spanish, the Scotch and the Rubinstein produce very different games.
See the full guide and plans1.e4 e5 2.Nf3 d6
The Philidor Defense props up the e5 pawn with ...d6 and aims for a compact structure. Black accepts less space early on in order to prepare ...Nf6, ...Be7 and a later ...d5 break.
See the full guide and plans1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6
The Semi-Slav combines the Slav's ...c6 support with the Queen's Gambit Declined's solid ...e6. The pawn triangle is rock-hard, but the c8 bishop needs an active solution.
See the full guide and plans1.d4 d5 2.c4 e6 3.Nc3 c5
The Tarrasch Defense meets the Queen's Gambit with the immediate ...c5 break. Black often accepts an isolated pawn on d5 in return for open lines, space and piece activity.
See the full guide and plans1.d4 Nf6 2.c4 e6 3.Nf3 b6
The Queen's Indian controls e4 with the bishop fianchettoed on b7 and avoids committing the central structure early. It is one of the most respected positional answers when White plays Nf3 and rules out the Nimzo-Indian.
See the full guide and plans1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+
The Bogo-Indian throws in a useful ...Bb4+ check before committing the central pawns. It is solid and flexible, and often transposes into Queen's Indian or Queen's Gambit structures.
See the full guide and plans1.d4 Nf6 2.c4 c5 3.d5 b5
In the Benko Gambit, Black offers a queenside pawn to open the a- and b-files and activate the g7 bishop. The compensation is positional and can last all the way into the endgame.
See the full guide and plans1.d4 Nf6 2.c4 e5
The Budapest Gambit challenges the d4 pawn immediately with ...e5. Black gives up a pawn temporarily to speed up development and create pressure on e5 and the b4-e1 diagonal.
See the full guide and plans1.d4 Nf6 2.Bg5
The Trompowsky Attack develops the bishop with an immediate threat of Bxf6, dodging most of the theory of the Indian defences. White is happy to give up the bishop pair to damage Black's structure or gain tempi in the centre.
See the full guide and plans1.d4 d5 2.Nf3 Nf6 3.e3 e6 4.Bd3
The Colle System uses a solid set-up with d4, Nf3, e3 and Bd3 before preparing e4. The scheme is easy to recognise, but it depends on getting the central break right or it turns passive.
See the full guide and plans1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 4.O-O Be7 5.d3
The King's Indian Attack is a developing system with Nf3, g3, Bg2, O-O and d3. White concedes space early on in order to prepare e4-e5 and a coordinated kingside attack.
See the full guide and plans1.b3
The Nimzo-Larsen Attack prepares the b2 fianchetto to press the centre from a distance. It is a flexible opening that can transpose into English, Réti or Bird structures.
See the full guide and plans1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6
The Najdorf is the most famous line of the Sicilian: ...a6 prepares ...e5 and ...b5, rules out Bb5+ and takes tactical control of the queenside. It is the weapon of choice of champions such as Kasparov and Carlsen.
See the full guide and plans1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6
The Sicilian Dragon fianchettoes the bishop on g7 for maximum pressure along the long diagonal and prepares the ...Rxc3 exchange sacrifice. Games are often decided by a race of opposite-side attacks.
See the full guide and plans1.e4 e5 2.d4 exd4 3.c3
The Danish Gambit offers central pawns in return for lightning development and open diagonals for the bishops. Taking everything can hand White a dangerous attack; the best defence is to give material back at the right moment.
See the full guide and plans1.d4 d5 2.c4 Nc6
The Chigorin Defense develops the b8 knight before playing ...e6, pressing d4 and going for active piece play instead of passively propping up the centre. It was Mikhail Chigorin's weapon in the 19th century.
See the full guide and plans1.d4 e5
The Englund Gambit sacrifices a pawn with ...e5 to destabilise White's centre and set opening traps. It is a sideline, but a popular one in amateur chess because of how many immediate traps it carries.
See the full guide and plans1.d4 d5 2.e4
The Blackmar-Diemer offers the e4 pawn on move two to get an open centre, free files and a fast attack against the black king. Accepting the sacrifice leaves White with a strong practical initiative.
See the full guide and plans1.e4 b6
The Owen Defense prepares the b7 fianchetto to press e4 from a distance. It is a flexible hypermodern choice that often transposes into Hippopotamus or Owen system structures.
See the full guide and plans1.e4 Nc6
The Nimzowitsch Defense develops the b8 knight on move one, leaving the e5 push for later with ...e5 or ...d5. It is an elastic choice that goes for imbalance from the start.
See the full guide and plans1.b4
The Sokolsky Opening, also known as the Polish or Orangutan, pushes the b-pawn to gain queenside space and fianchetto the bishop on b2. It is rare, but it takes Black out of theory immediately.
See the full guide and plans1.d4 Nf6 2.c4 d6
The Old Indian holds a compact centre with ...d6, ...e5 and ...Nbd7, then expands on the kingside or in the centre. It is a solid, flexible alternative to the King's Indian, with less early commitment.
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