King's Indian Defense: Orthodox Variation, Classical System

Before the first move

The King's Indian Defense is a deep, strategic battle where Black allows White to build a massive center only to strike back later. In the Mar del Plata variation, the game becomes a race: White attacks on the queenside while Black launches a direct, dangerous pawn storm against the White king.

1. d4White

White starts with d4, the move that defines most closed games. By occupying the center immediately, White prepares to build a solid structure. You can respond with many moves, but Nf6 is the most flexible, keeping your options open for several different defensive systems.

1... Nf6Black · your move

Develop your knight to f6. This is the most flexible response, preventing White from immediately playing e4 and preparing to see how White will structure their center. It keeps your options open for the King's Indian, the Nimzo-Indian, or the Queen's Gambit Declined.

Other paths here: Na6 (Australian Defense) · g5 (Borg Defense: Borg Gambit) · b6 (English Defense) · e5 (Englund Gambit)

2. c4White

White plays c4, expanding their central control and preparing to develop the knight to c3. This is the main line, though White could also choose the London System with Bf4 or the Trompowsky with Bg5. By playing c4, White signals they are ready for a heavy theoretical battle.

Other paths here: f4 (Canard Opening) · g4 (Indian Defense: Gibbins-Weidenhagen Gambit) · e4 (Indian Defense: Omega Gambit) · d5 (Indian Defense: Pawn Push Variation)

2... g6Black · your move

Push your pawn to g6. You are preparing to fianchetto your bishop to g7, where it will exert long-range pressure across the board. This move is the hallmark of the King's Indian and Grunfeld defenses, signaling your intent to attack from the flanks.

Other paths here: g5 (Indian Defense: Medusa Gambit) · b5 (Indian Defense: Pyrenees Gambit) · a6 (Indian: 2.c4 a6) · Nc6 (Mexican Defense)

3. Nc3White

White plays Nc3, increasing the pressure on d5 and preparing to seize the full center with e4. White had options like g3 for a Fianchetto system or Nf3, but Nc3 is the most direct way to challenge Black's hypermodern setup.

Other paths here: d5 (Indian Defense: Anti-Grünfeld, Advance Variation) · f3 (Indian Defense: Anti-Grünfeld, Alekhine Variation) · h4 (Indian Defense: Anti-Grünfeld, Basman-Williams Attack) · g3 (King's Indian Defense: Fianchetto Variation, Immediate Fianchetto)

3... Bg7Black · your move

Fianchetto your bishop to g7. From this powerful diagonal, your bishop eyes the center and the queenside. This piece is the soul of your position, providing both defense for your king and a potent weapon for future counterattacks.

Other paths here: d5 (Grünfeld Defense) · c5 (King's Indian: 3.Nc3 c5) · c6 (King's Indian: 3.Nc3 c6) · d6 (King's Indian: 3.Nc3 d6)

4. e4White

White plays e4, completing the classical pawn trio in the center. This is the most aggressive and principled way to meet the King's Indian. White could have tried quieter lines like Nf3 or g3, but e4 challenges you to prove your setup works.

Other paths here: Bf4 (King's Indian: 4.Bf4) · Bg5 (King's Indian: 4.Bg5) · g3 (King's Indian: 4.g3) · Nf3 (King's Indian: 4.Nf3)

4... d6Black · your move

Push your pawn to d6. This move is essential to stop White from pushing e5 and to prepare your own central strike with e5 or c5. It also opens a path for your light-squared bishop and solidifies your control over the center.

Other paths here: O-O (King's Indian: 4.e4 O-O)

5. Nf3White

White plays Nf3, continuing natural development. This is the Classical Variation. White has many aggressive alternatives here, such as the Samisch (f3), the Four Pawns Attack (f4), or the Makogonov (h3), but Nf3 is the most flexible and solid choice.

Other paths here: Bg5 (King's Indian Defense: Accelerated Averbakh Variation) · Nge2 (King's Indian Defense: Kramer Variation) · Bd3 (King's Indian: 4.e4 d6 5.Bd3) · h3 (King's Indian Defense: Makogonov Variation)

5... O-OBlack · your move

Castle your king to safety. By tucking your king away on g8, you complete your initial development and prepare to launch a counterstrike in the center. Your king is well-protected behind the fianchettoed bishop and the solid pawn chain.

Other paths here: Bg4 (King's Indian: 5.Nf3 Bg4) · c5 (King's Indian: 5.Nf3 c5) · Nbd7 (King's Indian: 5.Nf3 Nbd7)

6. Be2White

White plays Be2, the hallmark of the Classical Variation. By placing the bishop here, White avoids some of the tactical tricks associated with Bd3 or Bg5. It's a prophylactic move, preparing for the battle that will soon erupt in the center.

Other paths here: Be3 (King's Indian Defense: Larsen Variation) · Bg5 (King's Indian Defense: Zinnowitz Variation) · Bd3 (King's Indian: 5.Nf3 O-O 6.Bd3) · h3 (King's Indian: 5.Nf3 O-O 6.h3)

6... e5Black · your move

Push your pawn to e5. This is the critical central break in the King's Indian. You are directly challenging White's d4 pawn and forcing a decision. This move often leads to a closed center where the real strategic battle begins.

Other paths here: Na6 (King's Indian Defense: Kazakh Variation) · a5 (King's Indian: 6.Be2 a5) · a6 (King's Indian: 6.Be2 a6) · Bg4 (King's Indian: 6.Be2 Bg4)

7. O-OWhite

White castles, ignoring the tension on d4 for a moment. This is the main line. White could also choose the Exchange Variation with dxe5 or the Petrosian Variation with d5, but castling keeps the most options alive for the middlegame struggle.

Other paths here: dxe5 (King's Indian Defense: Exchange Variation) · Be3 (King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System) · d5 (King's Indian Defense: Petrosian Variation)

7... Nc6Black · your move

Develop your knight to c6. You are putting maximum pressure on the d4 pawn, forcing White to finally make a decision about the central structure. This move is the starting point for the famous Mar del Plata variation.

Other paths here: c6 (King's Indian Defense: Orthodox Variation, Donner Defense) · Na6 (King's Indian Defense: Orthodox Variation, Glek Defense) · a5 (King's Indian Defense: Orthodox Variation, Ukrainian Defense) · exd4 (King's Indian: 7.O-O exd4)

8. d5White

White plays d5, closing the center. This is the signal for the race to begin. By locking the middle, White ensures that the game will be fought on the wings. You'll have to move your knight, but you'll gain a clear plan in return.

Other paths here: Be3 (King's Indian: Mar del Plata, 8.Be3) · dxe5 (King's Indian: Mar del Plata, 8.dxe5)

8... Ne7Black · your move

Retreat your knight to e7. From here, the knight will swing over to the kingside to support your upcoming pawn storm. You are clearing the way for your f-pawn to charge forward and begin the assault on the White king.

9. Ne1White

White plays Ne1, the classical response. By moving the knight back, White prepares to meet your f5 push with f3, solidifying their king's defense. Alternatives like the Bayonet Attack (b4) or the Korchnoi Attack (Bd2) are much more aggressive and lead to different pawn structures.

Other paths here: b4 (King's Indian Defense: Orthodox Variation, Bayonet Attack) · Bd2 (King's Indian Defense: Orthodox Variation, Korchnoi Attack) · Nd2 (King's Indian Defense: Orthodox Variation, Modern System) · Bg5 (King's Indian: Mar del Plata, Odessa Variation)

Where you stand

The center is locked, and the race has begun. White will expand on the queenside with b4 and c5, aiming to break through and create threats. Black will counter with f5, g5, and f4, launching a direct pawn storm against the White king. Success depends on who can crash through their respective side of the board first.

• f6-e8 Relocate knight to prepare f5 push
• f7-f5 Begin the kingside pawn storm
• e1-d3 Position knight to support c5 break
• c4-c5 Open lines on the queenside
• f2-f3 Solidify the e4 pawn and king