King's Defences Sub Groups

From MICOS code: B00.004.IK

Starts with 1.e4 a6, a rare and provocative response that immediately sidesteps theory. While seemingly passive, it prepares b5 and queenside expansion, aiming to unbalance opponents early and drag them into unfamiliar territory.

From MICOS code: B00.010.IK

Starts with 1.e4 b6, a flexible hypermodern choice aiming to fianchetto the queen’s bishop and apply pressure on the central light squares. Often underestimated, it leads to rich strategic play with long-term potential and unexpected counterplay.

From MICOS code: B01.008.SI

Starts with 1.e4 c5 2.b4, an aggressive sideline where White immediately sacrifices a wing pawn to deflect Black from the center. It aims to destabilize Black’s setup early and steer the game into sharp, offbeat territory.

From MICOS code: B01.018.SI

Starts with 1.e4 c5 2.c3, a solid and strategic anti-Sicilian system. White avoids mainline theory and builds a strong center with d4, aiming for clarity, control and long-term pressure without early tactical complications.

From MICOS code: B01.033.SI

The Sicilian Defence begins with 1.e4 c5, immediately challenging White’s central control while preparing for counterplay on the queenside. 

From MICOS code: B01.077.SI

Starts with 1.e4 c5 2.Nc3 e6, where Black chooses a flexible and restrained setup against the Closed Sicilian.

By delaying …d6 and …Nc6, Black keeps central options open and prepares a later strike with …d5 under favorable conditions.

From MICOS code: B01.084.SI

Starts with 1.e4 c5 2.Nc3 Nc6 3.g3, where White adopts a quiet, flexible setup with a kingside fianchetto. This line aims for long-term pressure and positional maneuvering, steering clear of early tactical skirmishes in favor of controlled buildup.

From MICOS code: B01.099.SI

Starts with 1.e4 c5 2.Nf3 a6, a flexible response that avoids mainline theory and prepares …b5. The O’Kelly aims to create early imbalances, delay central commitments and sidestep sharp preparation—perfect for players seeking originality.

From MICOS code: B01.124.SI

Starts with 1.e4 c5 2.Nf3 d6 3.Bb5+, where White immediately checks to disrupt Black’s natural development in the Sicilian Defence. By forcing an early response, White aims to steer the game away from heavily analyzed main lines and into more practical territory.

From MICOS code: B01.145.SI

Starts with 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6, one of the most respected and deeply analyzed openings in chess. The Najdorf gives Black dynamic counterplay, rich complexity and long-term flexibility.

From MICOS code: B01.174.SI

Starts with 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6, a classical and resilient structure. Black builds a solid center, prepares kingside safety and waits for the right moment to strike with …d5 or …b5.

From MICOS code: B01.201.SI

Starts with 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6, entering the famous Dragon variation. This hypermodern setup focuses on fianchetto control of the long diagonal and explosive counterplay on the queenside.

From MICOS code: B01.243.SI

Starts with 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2, where White chooses a restrained and flexible development scheme against the Classical Sicilian. By placing the bishop on e2, White prioritizes kingside safety and avoids early theoretical commitments.

From MICOS code: B01.248.SI

Starts with 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5, a powerful anti-Sicilian weapon. White aims for early pressure on the knight and potential kingside attacking chances in highly theoretical lines.

From MICOS code: B01.287.SI

Starts with 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6, where Black mixes Caro-Kann structure ideas into Sicilian territory. This hybrid line offers a positional feel with tactical potential and early central clarity.

From MICOS code: B01.302.SI

Starts with 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6, a flexible and modern response. Black delays committing the kingside, often combining rapid development with queenside counterplay in fluid, dynamic setups.

From MICOS code: B01.331.SI

Starts with 1.e4 c5 2.Nf3 g6 3.d4 Bg7, where Black combines Sicilian counterplay with a rapid kingside fianchetto. By delaying …d6 and …Nc6, Black keeps the structure flexible and aims for early pressure with dynamic piece play.

From MICOS code: B01.343.SI

Starts with 1.e4 c5 2.Nf3 Nc6 3.Bb5, aiming to provoke structural weaknesses and avoid heavy theory. A smart choice for those who want positional pressure and piece activity without diving into mainline warfare.

From MICOS code: B01.351.SI

Starts with 1.e4 c5 2.Nf3 Nc6 3.d4, opening the door to the deepest branches of Sicilian theory. This central breakout leads to sharp, double-edged battles where initiative, calculation and preparation reign.

From MICOS code: B01.383.SI

Starts with 1.e4 c5 2.Nf3 Nf6, where Black immediately challenges White’s central intentions without committing to a specific pawn structure. By developing the knight early, Black keeps maximum flexibility and invites White to define the center first.

From MICOS code: B02.008.CK

Starts with 1.e4 c6 2.c4, where White immediately challenges the Caro–Kann structure by expanding in the center before Black commits to …d5. The early c-pawn advance aims to seize space and steer the game into Panov-type structures by an uncommon move order.

From MICOS code: B02.022.CK

Starts with 1.e4 c6 2.d4 d5 3.e5, where White immediately grabs space and restricts Black’s central counterplay. This line sets the tone for a long-term positional battle with potential for powerful kingside attacks.

From MICOS code: B02.035.CK

Starts with 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4, introducing early central tension and open lines. White challenges Black’s structure with dynamic play and aims for quick development and pressure on the d5 pawn.

From MICOS code: B02.058.CK

Starts with 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5, a time-tested and solid line where Black develops quickly and aims for a rock-solid position. Known for its resilience and clarity, it often leads to strategic, maneuvering battles.

From MICOS code: B02.068.CK

Starts with 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7, a refined and flexible variation named after the former World Champion. Black avoids early commitments and prepares a solid, counterattacking setup with deep strategic potential.

From MICOS code: B02.097.CK

Starts with 1.e4 c6 2.Nc3 d5 3.Nf3, where White develops naturally and applies early pressure to the center without committing the c-pawn. The setup emphasizes flexibility and rapid piece coordination against the Caro–Kann structure.

From MICOS code: B03.012.SC

Starts with 1.e4 d5 2.exd5 Nf6 3.d4 Bg4, offering quick piece activity in exchange for structure. This bold gambit seeks rapid development, early kingside pressure and dynamic chances, often catching opponents off guard in the opening phase.

From MICOS code: B03.033.SC

Starts with 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 e5, where Black counters White’s central expansion with an immediate pawn break. Instead of retreating into passive defence, Black actively challenges the center and seeks dynamic equality through piece activity.

From MICOS code: B03.037.SC

Starts with 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6, where Black develops naturally instead of striking the center immediately. The focus is on piece activity and solid coordination, keeping central tension intact.

From MICOS code: B04.019.PI

Starts with 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4, where White grabs space and aggressively challenges Black’s setup. This sharp and ambitious line puts immediate pressure on the center and often leads to complex, double-edged positions.

From MICOS code: B04.028.PI

Starts with 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3, where White develops harmoniously and avoids early confrontation. Both sides focus on solid structure and flexible piece placement rather than immediate tactical clashes.

From MICOS code: B05.013.FR

Starts with 1.e4 e6 2.d4 a6, where Black immediately prepares queenside expansion rather than contesting the center directly. The move …a6 signals an unorthodox strategy aimed at provoking White and steering the game into uncommon structures.

From MICOS code: B05.025.FR

Starts with 1.e4 e6 2.d4 d5 3.e5, where White immediately stakes space and locks in tension. This ambitious setup leads to rich positional battles, with long-term attacking chances and deep strategic planning on both sides.

From MICOS code: B05.045.FR

Starts with 1.e4 e6 2.d4 d5 3.exd5, where White immediately clarifies the central tension in the French Defence. By exchanging on d5, White avoids closed pawn chains and steers the game toward more open and symmetrical structures.

From MICOS code: B05.052.FR

Starts with 1.e4 e6 2.d4 d5 3.Nc3 a6 4.Nf3 Nf6 5.e5 Nfd7, where Black adopts a restrained French structure with …a6, delaying central confrontation and preparing flexible piece coordination. The position clarifies quickly after the advance e5, leading to concrete plans rather than prolonged system development.

From MICOS code: B05.095.FR

Starts with 1.e4 e6 2.d4 d5 3.Nc3 dxe4, a calm and solid option that neutralizes early complexity. Black simplifies the center and aims for piece activity, often leading to quiet but strategic middlegames.

From MICOS code: B05.108.FR

Starts with 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4, a counter-attacking system that disrupts White’s plans early. Tension rises quickly as both sides fight for initiative in a line filled with sharp tactics and complex ideas.

From MICOS code: B05.121.FR

Starts with 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7, a time-honored and flexible structure. Black develops calmly, allowing for safe king placement while keeping central counterplay options open for the middlegame.

From MICOS code: B05.151.FR

Starts with 1.e4 e6 2.d4 d5 3.Nd2, a positional and prophylactic approach. White avoids early exchanges and keeps central tension alive, leading to rich strategic battles with reduced theory and solid structure.

From MICOS code: B06.008.RO

Starts with 1.e4 g6 2.d4 Bg7 3.c4 c5, where Black immediately challenges White’s central setup and steers the game into Benoni-type pawn structures reached via 1.e4. Unlike Modern or Pirc systems, the early …c5 creates direct central tension and defines the character of the opening from the outset.

From MICOS code: B06.012.RO

Starts with 1.e4 g6 2.d4 Bg7 3.c4 c5 4.Nf3, where Black combines kingside fianchetto ideas with an immediate queenside challenge. The check on a5 introduces early pressure and disrupts White’s natural development.

From MICOS code: B07.010.PT

Starts with 1.e4 g6 2.d4 Bg7 3.Nc3 c5 4.Nf3 Qa5, where Black adopts a Pterodactyl-style setup and immediately pressures the center with an early queen check. White replies with practical developing moves that resolve the tension quickly.

From MICOS code: B08.009.ND

Starts with 1.e4 Nc6 2.d4 d5 3.e5, where White advances the e-pawn to gain space and restrict Black’s central counterplay.  The advance defines the structure early and forces Black to seek active piece play rather than immediate central equality.

From MICOS code: B08.022.ND

begins with 1.e4 Nc6 2.d4 e5, where Black immediately challenges the center with a direct pawn thrust. Instead of delaying central contact, Black opts for confrontation, aiming to unbalance the game at an early stage.

From MICOS code: B08.043.ND

El Columpio Defence arises after 1.e4 Nc6 2.Nf3 Nf6 3.e5 Ng4, where Black invites early tension by provoking the e-pawn advance and rerouting the knight aggressively. The resulting positions are sharp and concrete, with early commitments from both sides.

From MICOS code: B09.012.AL

Starts with 1.e4 Nf6 2.e5 Nd5 3.c4 Nb6 4.c5 Nd5, where White gains space and drives Black’s knight repeatedly before committing to central resolution. The resulting structure is aggressive and unbalanced, with White emphasizing space and piece activity over immediate development harmony.

From MICOS code: B09.027.AL

Starts with 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4 with a sharp and aggressive system where White seizes maximum central space early. Ideal for players who thrive on initiative, dynamic pawn structures and direct confrontation in the opening.

From MICOS code: B09.036.AL

Modern Defence arises from  Alekhine’s Defence after 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3. White builds a broad pawn center and rapid piece development, aiming to restrict Black’s typical counterplay. It’s a principled, strategic setup that challenges Black’s provocative first move while preparing long-term central control.