Modern Defense (Robatsch Defense)

The Modern Defense is a King’s Pawn Opening, which starts with the moves 1.e4 g6 and the opening is closely related to the Pirc Defense as they can easily transpose to each other. At the same time, it employs the principles of the hypermodern school of chess, meaning that black allows white to build a strong center with pawns and then try to disrupt it with a timely counterattack.

In the 1960s and 1970s, the Austrian chess player Karl Robatsch made serious contributions to the opening theory of Modern Defense. Therefore, the move order is also known as the Robatsch Defense. While the Modern Defense is not frequently seen in today’s elite-level chess, it is still occasionally employed as a strategic weapon due to the imbalances it creates on the board. It is filed under ECO code B06, and because the …g6 / …Bg7 setup can be used against 1.d4 and other first moves as well, many club players adopt it as a universal, low-theory answer for black.

TL;DR

• The Modern Defense (1.e4 g6), also known as the Robatsch Defense (ECO B06), is a flexible hypermodern opening in which black hands white the center and strikes back with the fianchettoed g7-bishop and a well-timed …c5 or …e5.
• It works against both 1.e4 and 1.d4, transposes easily into the Pirc Defense, the King’s Indian, or the Benoni, and suits players who prefer counterattacking, asymmetrical middlegames over memorizing long forcing lines.
• Below you will find the main setups (Standard 4.Be3, Pseudo-Austrian 4.f4, Averbakh 3.c4, Pterodactyl 3…c5), YT video eith all variations covered, the common traps both sides fall into, and three annotated grandmaster games.

Winning Percentages on both sides

Video Tutorial: How to Play the Modern Defense

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Done with the quick video guide? Dive into the rest of the article to see move-by-move explanations and practical examples of the Modern Defense.

Opening’s Key Ideas

The Modern Opening is a flexible and complex system that can be transposed from many lines as well as can transpose into different systems. At the same time, the line creates an asymmetrical pawn structure on the board, which allows black to follow a clear plan to seek a counterplay and play for a win. So the opening is oftentimes preferred as a surprise weapon with the intention of playing for more than equalizing the game as black.

As a product of hypermodern philosophy, the Modern Defense shares a similar strategic approach to the Grunfeld Defense, focusing on applying pressure to white’s central pawn structure, specifically targeting the d4 pawn. The most thematic way to disrupt white’s center is to play …c5 at the right time, complementing the pressure of the fianchettoed bishop on g7 on the long diagonal. Mass exchanges of pieces typically don’t happen until the middlegame, when both sides have completed their development. This means the tension in the center will be maintained for a while, usually until both sides start launching a wing attack. White can choose to castle queenside, followed by a kingside attack with h4 or castle kingside and try to consolidate black’s queenside expansion by playing moves like a4. Black therefore has to often adapt white’s decision of game plan and seek a counterplay accordingly.

How to Set Up the Modern Defense

The strength of the Modern Defense is that black follows a simple, repeatable setup rather than a forcing line. The core moves are …g6, …Bg7, …d6, with …Nf6 or …c5 saved for later, which means the same plan can be reached against almost any first move by white. After 1.e4, black plays 1…g6 and meets 2.d4 with 2…Bg7, putting the dark-squared bishop straight onto the long diagonal. That bishop on g7 is the soul of the opening, so black avoids trading it and builds the rest of the position around its pressure on d4.

The same idea works against 1.d4 g6 and even 1.c4 or 1.Nf3, which is why many club players adopt the Modern as a universal answer to white’s first move. The one move order to treat with caution is 1.b3, where white’s bishop reaches b2 before black’s reaches g7. Once the fianchetto is in place, black picks a central break …c5 to hit d4 in Sicilian style, or …e5 for a King’s Indian type of structure, depending on how white develops. This wait-and-see approach is exactly what lets black keep the position flexible and steer the game toward the structures they understand best.

Modern Defense’s Theory

The Modern Defense is characterized by the setup of black with …g6, …d6, …Bg7 and can be played with different move orders. This setup is almost identical to Pirc Defense in appearance, with the difference that in Modern Defense, black delays the development …Nf6 to restrain white from playing e5 and it is therefore considered less risky than Pirc Defense. Against the Modern Opening, white has a free hand to choose the setup they wish. The most standard and natural line is to develop pieces to launch a kingside attack: 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Be3 a6 5.Qd2, known as the Standard Defense. A relatively more aggressive setup for white against 3…d6 is the Pseudo-Austrian Attack with 4.f4. Alternatively, black can play 3…c5, in a similar fashion to the Accelerated Dragon variation of the Sicilian Defense in order to disrupt white’s center early with 1.e4 g6 2.d4 Bg7 3.Nc3 c5 (Pterodactyl Variation). Lastly, instead of 3.Nc3, white may attempt to occupy a broader pawn center with the Averbakh System: 1.e4 g6 2.d4 Bg7 3.c4.

Standard Defense: 4.Be3 a6 5.Qd2

After 1.e4 g6 2.d4 Bg7, white has to make the first critical decision for their opening setup by choosing between 3.c4 and 3.Nc3. The latter is the most played continuation and aims for quick queenside development. Black then restrains the white center with 3…d6, preparing …e5 or …c5 later, and white will continue to develop queenside pieces with 4.Be3. This setup by white is also known as 150 Attack and white has a clear plan of eliminating black’s dark-squared bishop, which is the key piece in black’s set up. Unless black wants to transpose to the Pirc Defense with 4…Nf6, black now has two main ways to continue, and both of them involve expanding on the queenside: The first option is 4…c6 5.Qd2 b5 6.Bd3 (6.0-0-0 Qa5 with promising attacking chances for black) Nd7

But the most flexible and a more popular option after 4.Be3 is 4…a6. Black’s intention is the same as with 4…c6, aiming to expand on the queenside by playing …b5. It is important to note that this idea is efficient only if white has developed Nc3, because the idea behind …b5 is to advance to …b4 to dislodge the knight and attack the pawn on e4 with Bb7-Nf6. 5.Qd2, not only preparing queenside castle but also preparing Bh6, once the g8-Knight develops, 5…b5 6.f3 Nd7, still delaying …Nf6 and preparing …c5. Now white can either challenge black on the queenside with 7.a4 or directly launch a kingside attack with 7.h4, which is the most commonly played move.

Black needs to take some safety measures and deal with white’s aggressive approach by playing 7…h5 (7…h6 is also possible). A possible game continuation would be: 8.Nh3 Bb7 9.Ng5 Ngf6 10. 0-0-0 e6 11.Kb1 Qe7 and after ….Rc8 or …Rd8, black will attempt a pawn break in the center with …c6-c5 or …e5.

Pterodactyl Variation: 3…c5

In the Pterodactly Variation, black can expect white to either capture 4.dxc5 or play 4.d5. The latter transposes to a structure of Benoni Defense, so black has to be prepared for the ideas in that opening. After 4.dxc5, black continues to apply cross-diagonal pressure with 4…Qa5, double attacking the knight on c3.

However, white has no problems after 5.Bd2 Qxc5 and can cause black some trouble with 6.Nd5, threatening Bb4. For example, after 6…Na6 7.Nf3 e6 8.Bc3 and white manages to exchange black’s key piece on g7, creating structural dark-square weaknesses. Therefore, the Pterodactly Variation is not very commonly played by black.

Pseudo-Austrian Attack: 4.f4

The Pseudo-Austrian Attack with 4.f4 is one of the most aggressive approaches white can employ against Modern Defense. The basic idea behind 4.f4 is to support the advance of e5 and seize a space advantage. At the same time e5 will weaken the control of d5 square, so black will usually transpose to Pirc Defense by playing 4…Nf6 and aiming not only to castle quickly but also to meet 5.Nf3 0-0 6.e5 dxe5 7.fxe5 with 7…Nd5. Therefore, white should not hurry with e5 and continue with development 6.Bd3.

On the other hand, white has spent some time building a center with pawn moves, while has black completed development on the kingside and is therefore ready to undermine white’s center with either 6…Na6 7.0-0 c5 or 6…Nc6 7.0-0 e5 followed by …Bg4, pinning the knight.

Averbakh System: 3.c4

Similar to the Austrian Attack with 4.f4, Averbakh System with 3.c4 is another way white can try to occupy the center to control as many key squares as possible. This system is quite versatile and has a high chance of transposing to the King’s Indian Defense. Therefore, it is recommended for black to be familiar with the ideas of the opening. On the other hand, 3.c4 deprives white of the support of the pawn on d4 with c3 later as well as blocking Bc4. After 3…d6 4.Nc3, black can transpose to King’s Indian Defense with 4…Nd7 or 4…Nf6. The most common way for black to keep the game in the territory of Modern Opening is 4..e5. Transitioning into the endgame with 5.dxe5 dxe5 6.Qxd8 Kxd8 gives white no advantage, so white usually prefers to close the position with 5.d5

The main idea for black in this pawn structure is to eventually play ..f5. 5…f5 now would be premature, so black usually prepares the pawn break with 5…a5 (stopping white’s b4) 6.Bd3 Na6 7.Nge2 Nc5 8.Bc2 Nf6 9. 0-0 0-0 10.f3 Ne8 followed by …f5 next.

Common Traps in the Modern Defense

Because both sides develop quickly and the center stays fluid, the Modern Defense hides several practical traps that decide club games before the middlegame even begins.

Trap #1

The first one targets black’s most important piece. After 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Be3, white’s whole plan is Qd2 followed by Bh6, trading off the g7-bishop and leaving black with weak dark squares. A player who castles kingside too early often walks straight into this exchange. The standard antidote is to delay …Nf6 and …0-0, keep the bishop on g7, and only allow the trade when the white queen can be chased back with tempo or when black has counterplay ready on the queenside.

Trap #2

A second trap runs the other way. In the Pterodactyl lines with an early …c5, an unprepared white player who grabs the pawn with 4.dxc5 can be met by 4…Qa5, pinning the knight on c3 and regaining the pawn with a comfortable game. White has to know 5.Bd2 here; natural-looking defenses often cost a pawn or the exchange.

The most common pitfall for black, though, is purely positional: rushing …Nf6 before it is needed. In the Modern, the knight is deliberately kept off f6 so that white cannot gain space and time with e5. Black who plays …Nf6 on autopilot frequently allows e5, after which the g7-bishop is blunted and white enjoys a free space advantage, exactly the position the Modern is designed to avoid.

Modern Defense vs the Pirc and King’s Indian Defense

Anyone researching the Modern Defense quickly runs into two close relatives, and knowing the difference helps you pick the right setup. Against the Pirc Defense, the structures are nearly identical, both rely on …g6, …d6 and the g7-bishop, but the Modern delays …Nf6. That single difference is the whole point: by keeping the knight at home, black stops white from grabbing space with an early e5 and keeps …c5 and …e5 available. The trade-off is that white can sometimes blunt the bishop with an early c2-c3, an idea that disappears once a knight sits on f6.

The King’s Indian Defense comparison shows up mainly through the Averbakh System with 3.c4, which can transpose directly into King’s Indian structures after …d6 and …Nf6. The practical takeaway is that a Modern Defense player should be comfortable with King’s Indian breaks like …e5 and …f5, because white can steer the game there at will. In short, the Modern is the most flexible member of the family, it can become a Pirc, a King’s Indian, or a Benoni depending on white’s reaction, which is exactly why it appeals to players who would rather understand plans than memorize lines.

Quick Tests for Opening’s Revision

№1

The position appears after 1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Be3 a6 5. Qd2 b5 6. f3 Nd7:

Note: White to play.

Hint: Launch a kingside attack with one of your pawns.

№2

The position appears after 1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 Nf6 5. Nf3 O-O 6. Bd3 Na6 7. O-O:

Note: Black to play.

Hint: Exchange White’s d4-pawn.

№3

The position appears after 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. dxc5 Qa5 5. Bd2 Qxc5 6. Nd5 Na6 7. Nf3 e6:

Note: White to play.

Hint: Exchange both dark-squared Bishops.

Pros and Cons

Conclusion

In conclusion, the Modern Defense offers a dynamic and unorthodox opening choice with its hypermodern philosophy. The opening is versatile, and due to potential transpositions, it requires a certain degree of familiarity with structures that occur in King’s Indian Defense or Benoni Defense. However, the line also carries risks, such as leading to a passive position for black. Therefore, precise move orders and good timing of counterattacks are essential. Overall, the Modern Defense is rather suited for intermediate to advanced players, but it can also help beginners gain familiarity with game

Written by

Deniz Tasdelen, FIDE-rated player

FIDE-rated player (ID 6305946) with 20+ years of competitive experience. Top-20 finish at the European Youth Championship, three-time 3rd at the Turkish Youth Championship, and competed at the World Youth and World Junior Championships. Defeated both Hikaru Nakamura and Fabiano Caruana at the FIDE Fischer Random World Championship — both games live-streamed by chess.com.

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Grandmaster games with Modern Defense

1. Abhimanyu Mishra vs. Hikaru Nakamura, 2025

2. Anish Giri vs. Magnus Carlsen, 2022

3. Daniil Dubov vs. Rauf Mamedov, 2022

FAQ’s

Do grandmasters play the Modern Defense?

Yes, grandmasters do play the Modern Defense. It’s a flexible and dynamic opening that has been employed by many top-level players, especially those who prefer unorthodox and less predictable lines.

Is the Modern Defense a good opening?

The Modern Defense is considered a good opening for players who enjoy a hypermodern style of play. It allows for a strong counter-attack and control of the center from a distance. However, its effectiveness can depend on the player’s style and proficiency in handling asymmetrical positions.

Why is the Modern Defense also called the Robatsch Defense?

The opening is named after the Austrian grandmaster Karl Robatsch, who developed much of its early theory in the 1960s and 1970s. Both names describe the same opening 1.e4 g6 with a quick …Bg7, filed under ECO code B06. English-language sources tend to say “Modern Defense,” while older books and game databases often use “Robatsch Defense.”

Can you play the Modern Defense against 1.d4?

Yes. One of its biggest practical advantages is that the …g6, …Bg7, …d6 setup works against almost any first move, including 1.d4, 1.c4 and 1.Nf3. Against 1.d4 the game often takes on a King’s Indian or Benoni character, so black should be ready for those structures. The main exception is 1.b3, where white’s bishop reaches the long diagonal first and black has to play more carefully.

Is the Modern Defense good for beginners?

It is a reasonable choice for beginners who want to spend less time memorizing theory, because it relies on one repeatable setup rather than long forcing lines. The trade-off is that white usually gets more space and decides where the action happens, so beginners need to develop a feel for counterattacking and for handling slightly passive positions. Many players use it as a practical surprise weapon while they build that experience.

What is the Gurgenidze variation of the Modern Defense?

The Gurgenidze System is a solid, structure-based way to meet white’s broad center, reached after 1.e4 g6 2.d4 Bg7 3.Nc3 c6 and a later …d5. Instead of the usual counterattack on d4, black challenges e4 directly and builds a Caro-Kann-like pawn chain, aiming for a slower strategic game. It is a useful option for players who prefer structure over sharp tactics.