How to Play the Modern Defense
The most flexible reply to 1.e4. Fianchetto the dark-squared bishop, delay everything else, and choose your structure based on White's setup. A full guide to the Standard Modern, Tiger Modern, Hippopotamus, and Sniper.
TL;DR — Quick Answer
- Move: 1.e4 g6 (then ...Bg7, choose your structure on move 3 or 4)
- Black's plan: Fianchetto the dark-squared bishop, delay every other commitment, choose between Pirc-style, Tiger, Hippopotamus, or Sniper based on what White does
- Key advantage: Sidesteps the Pirc's most dangerous line (150 Attack) while reaching the same kind of hypermodern middlegames
- Main systems: Standard Modern (...d6+...Nf6) — Tiger Modern (...a6+...b5) — Hippopotamus (double fianchetto) — Sniper (...c5)
- Best for: Intermediate players (1400+) who want maximum flexibility, a surprise weapon, or to avoid Pirc's 150 Attack
What Is the Modern Defense?
The Modern Defense (sometimes called the Robatsch Defense) is the hypermodern reply to 1.e4 that begins:
1. e4 g6
2. d4 Bg7
(then choose: ... d6, ... c5, ... b6, or ... a6)
The Modern's defining feature is radical flexibility on move 3. After the fianchetto, Black has not committed to a knight development, a pawn structure, or a central plan — and that ambiguity is the whole point. Depending on what White does, Black chooses between four completely different middlegames: a Pirc-style position (with ...d6 + ...Nf6), a Tiger Modern queenside expansion (with ...a6 + ...b5), a Hippopotamus double-fianchetto (with ...b6 + ...e6), or a Sicilian-style sharp counter (with ...c5).
The opening was popularized in the mid-20th century by Karl Robatsch and Duncan Suttles and revitalized in the 2000s by Tiger Hillarp Persson's book “Tiger's Modern.” Today it is used by Hikaru Nakamura, Richard Rapport, Baadur Jobava, and Magnus Carlsen (in rapid/blitz) as a surprise weapon that sidesteps both 1.e4 e5 theory and the heavy preparation that targets the Pirc and Sicilian.
Why 1...g6 Before Everything Else
The Modern's key insight is that playing ...g6 before ...d6 or ...Nf6 commits to nothing except the bishop fianchetto. That single delay unlocks every Modern sub-system:
1. ... g6 (fianchetto only)
2. ... Bg7 (still flexible)
(then ... d6 / ... c5 / ... b6 / ... a6)
Compare to the Pirc, which forces ...Nf6 on move 2: that knight commitment lets White play the 150 Attack (Be3+f3+Qd2+0-0-0+h4-h5) very effectively because the f6-knight is a target for both Bg5 pins and h4-h5 pushes. In the Modern, ...Nf6 either never happens (Tiger, Hippopotamus, Sniper) or arrives much later, so the 150 Attack has nothing to grab. White is forced into less ambitious setups where Black has more practical chances.
The cost of this flexibility: White can play 2.d4 Bg7 3.c4 transposing to King's Indian / Modern Benoni structures that Pirc players rule out by playing ...d6 early. So the Modern repertoire requires you to know how to play against c4 — usually with ...d6 + ...Nf6 + ...0-0 reaching standard King's Indian positions, which conveniently shares theory with the King's Indian Defense.
The Four Main Modern Systems
The Modern Defense isn't a single opening — it's a menu of four different middlegames sharing the same first move. Pick the one that matches your style:
Standard Modern — 2.d4 Bg7 3.Nc3 d6
2.d4 Bg7 3.Nc3 d6
The most popular Modern setup and the easiest to learn. Black fianchettoes the dark-squared bishop, plays ...d6 to support a future ...e5 break, and then chooses between ...Nf6 (transposing to a Pirc) or ...c6 + ...Nd7 (Tiger Modern). White's most common response is 4.Nf3 or 4.f4, both leading to Pirc-style positions where Black knows the standard ...c5 and ...e5 break patterns. If you only learn one Modern line, learn this one — it gives you 70% of the Modern's practical value with 20% of the theory.
Tiger Modern — 3...d6 + ...a6 + ...Nd7 + ...b5
3...d6, ...a6, ...Nd7, ...b5
Tiger Hillarp Persson's signature system. After 1.e4 g6 2.d4 Bg7 3.Nc3 d6, Black plays ...a6 and ...Nd7 instead of ...Nf6 — preparing a fast queenside expansion with ...b5, ...Bb7, and ...c5 while keeping the f6-square free for a knight or pawn. The Tiger Modern delays ...Nf6 deliberately: White can't set up the 150 Attack effectively because ...Nf6 isn't there to be pinned by Bg5 or attacked by h4-h5. The cost is that Black is slower to challenge the center. Excellent surprise weapon and a strong choice for players who want maximum flexibility.
Hippopotamus — ...g6, ...b6, ...d6, ...e6, ...Bg7, ...Bb7, ...Nd7, ...Ne7
...g6, ...b6, ...d6, ...e6
Black's most provocative setup: develop every piece to the second rank and wait. Two fianchettoes (Bg7 and Bb7), two knights to e7 and d7, and pawns on a6/b6/d6/e6/g6/h6 — a 'crouching beast' that invites White to overextend. Boris Spassky famously used it twice in his 1966 world-championship match against Petrosian (both drawn). The theory: if White doesn't break through, Black's compact structure has no weaknesses and Black can break later with ...c5, ...d5, or ...f5. The Hippopotamus is unsound at the top level but devastatingly effective against players who don't know how to break it down — many sub-2000 opponents will overpush and self-destruct.
Sniper — 2.d4 Bg7 3.Nc3 c5
2.d4 Bg7 3.Nc3 c5
The Modern's sharpest sub-system: instead of supporting the center with ...d6, Black challenges it immediately with ...c5. After 4.dxc5 (the principled reply), Black plays 4...Qa5 hitting c5 and c2, and after 5.Bd2 Qxc5 reaches a Sicilian-like middlegame with the bishop already on g7. The Sniper combines Modern flexibility with Sicilian counterplay — a single ...c5 push and Black is playing an open game with the g7-bishop pointing straight at White's queenside. Sharp, principled, and almost completely untouched by club-level theory.
Practical tip: Start with the Standard Modern — it's the most common position type and shares 90% of its theory with the Pirc, so any Pirc preparation transfers directly. Once you know the Standard, add the Tiger Modern as your second weapon (this is the line that gives the Modern its real bite). Save the Hippopotamus and Sniper for surprise weapons in blitz — they're sharp but theoretically dubious against careful opposition.
Tiger Modern Main Line — Move by Move
The Tiger Modern is the system that gives the Modern its real identity — a queenside expansion that the Pirc physically cannot reach. The mainline runs:
1. e4 g6 2. d4 Bg7
3. Nc3 d6 4. Be3 a6
5. Qd2 Nd7 6. f3 b5
7. a3 Bb7 8. h4 h5
9. Nh3 Ngf6 10. O-O-O c5
By move 10, Black has reached a complex Modern middlegame with queenside expansion already complete and pieces well placed to support either ...c5 (the central break) or ...b4 (the queenside attack). Notice that ...Nf6 arrived on move 9 — too late for White's h4-h5 push to be a real threat (Black already played ...h5 on move 8 to freeze White's h-pawn). This is the exact sequence that makes the Modern superior to the Pirc against the 150 Attack: by delaying ...Nf6, Black neutralizes White's kingside plan before it starts.
- WhiteHas built a 150-Attack-style setup but the pawn storm (h4-h5) is blunted by Black's ...h5. White must shift to a queenside-attack plan with Nb1-Nd2-Nc4 or accept that the position is roughly balanced.
- BlackPlays for ...b4 forcing the Nc3 to retreat, or ...c5 hitting d4 with both rooks ready to swing to the c-file. The Bg7 + Bb7 double-fianchetto gives Black two long-diagonal bishops aimed at White's king and queenside.
Key Strategic Themes
Master these four concepts and you can navigate any Modern middlegame, regardless of which system you chose or which setup White plays:
Maximum flexibility — pick your structure on move 4
The Modern's core advantage over the Pirc is that 1...g6 commits to nothing except the bishop fianchetto. After 2.d4 Bg7, Black can choose between a Pirc-style ...d6+...Nf6 (Standard Modern), a queenside-expansion Tiger setup with ...d6+...a6+...b5, a hyper-flexible Hippopotamus with ...b6+...e6, or a Sicilian-style ...c5 (Sniper). Each system reaches a completely different middlegame, and Black chooses on move 3 or 4 based on what White does. This is the single biggest reason strong players use the Modern as a surprise weapon — White can prepare against the Pirc, but the Modern's tree of options is too wide to cover with normal preparation.
Avoiding the 150 Attack — Modern's edge over Pirc
The Pirc's worst nightmare is the 150 Attack (Be3+f3+Qd2+0-0-0+h4-h5), which scores +0.3 to +0.5 for White at the top level. The Modern sidesteps this entirely. By playing 1...g6 first and delaying ...Nf6, Black gives the 150 Attack nothing to grab: no f6-knight to pin with Bg5, no Nf6 for h4-h5 to chase, and no committed knight blocking the e-pawn. Modern players reach Pirc-like positions through different move orders without ever facing the most dangerous Pirc line. If the only thing you knew about the Modern was 'it avoids the 150 Attack,' that alone would justify learning it.
The g7-bishop and the long diagonal
Like the Pirc, King's Indian, and Grünfeld, the Modern's identity is the fianchettoed dark-squared bishop. The Bg7 pressures the a1-h8 diagonal, defends the king's dark squares, and supports every Black break (...c5 hits d4, ...e5 opens the diagonal, ...d5 challenges e4). Three rules that apply to almost every Modern middlegame: (1) never trade the g7-bishop without a concrete tactical reason, (2) avoid moves that block the diagonal (...e6 in non-Hippopotamus systems, ...Nf6 if it gets pinned by Bg5), and (3) when in doubt, find a move that activates the g7-bishop — even a tempo spent on ...Nb8-d7-f6-d7-f6 maneuvering is worth it if the bishop's diagonal opens.
Provoke first, attack second — the hypermodern timing rule
Modern players reverse the classical opening order: instead of developing pieces and then planning a break, you wait for White to commit a structure, then attack the weak square that structure created. Examples: against an early c4 setup play ...Nc6 + ...e5 (attacking d4); against f4 play ...c5 (the d4-square becomes Black's outpost after exchanges); against Be3+f3 play ...c6+...b5 (queenside attack before White's kingside attack arrives). The skill ceiling is high — you must read White's plan correctly before choosing your break — but the reward is positions where every Black piece has a clear job and every White advance creates a target.
Modern vs Other Defenses to 1.e4
How does the Modern compare to the other 1.e4 defenses you might already know?
Modern vs Pirc Defense (1...d6)
Same family, one critical move-order difference. The Pirc commits to ...Nf6 on move 2; the Modern delays it indefinitely. The Modern's flexibility gives Black three extra setups (Tiger, Hippopotamus, Sniper) and sidesteps the 150 Attack, the Pirc's worst line. The Pirc's precision rules out White's c4 Benoni transpositions. Most players who graduate from the Pirc add the Modern as a second weapon — same hypermodern philosophy, twice as many options.
Modern vs Alekhine's Defense (1...Nf6)
Both are hypermodern provocations, but they target different White weaknesses. Alekhine's lures White into a pawn chase (1...Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 — the Modern Variation) — the gambit is concrete and forcing. The Modern is positional and slow-burn — no immediate provocation, just patient flexibility. Alekhine's is better for tactical players who want sharp early decisions; the Modern is better for strategic players who want to outmaneuver opponents in the middlegame.
Modern vs King's Indian Defense (against 1.d4)
These two openings share enormous theory because the Modern transposes to King's Indian structures when White plays 2.d4 Bg7 3.c4. Most Modern players use the Modern against 1.e4 and the King's Indian against 1.d4 to get a unified, fianchetto-based repertoire that works against everything. The shared setup means you spend study time once and use the patterns in both openings.
Modern vs Caro-Kann (1...c6)
Opposite strategic philosophies. The Caro-Kann is classical — Black challenges the center with ...d5, reaches solid structures, and plays for clean endgames. The Modern is hypermodern — Black lets White take the center and counterattacks with pieces. The Caro-Kann is vastly safer and easier; the Modern is sharper, more flexible, and rewards understanding over memorization. Pick the Caro-Kann if you value reliability; pick the Modern if you value surprise value and creative play.
Modern vs Sicilian Defense (1...c5)
The Sicilian gives Black the highest winning chances of any 1.e4 reply but at the cost of memorizing massive theory (the Najdorf alone has 30+ playable sub-variations). The Modern reaches a wide variety of middlegames with almost no forced theory — flexibility is its substitute for sharp memorization. If you have unlimited study time, pick the Sicilian. If you want a sound, low-prep weapon that adapts to any opponent, pick the Modern.
How to Learn the Modern Defense (Step by Step)
- Memorize the fianchetto trigger. Black's first two moves are always the same: 1...g6, 2...Bg7. Drill these against every White first move — they work identically against 1.e4, 1.d4, 1.c4, and 1.Nf3. The decisions start on move 3 with which Modern system to deploy.
- Learn the Standard Modern first. Play 1...g6 2...Bg7 3...d6 and head into Pirc-style positions. This shares ~90% of its theory with the Pirc Defense, so any Pirc study transfers directly. The Standard Modern is your “safe choice” when you don't want to gamble on a surprise weapon. Master this before anything else.
- Add the Tiger Modern as your second weapon. The signature line: 1...g6 2...Bg7 3...d6 4...a6 5...Nd7 6...b5 — queenside expansion before White can build the 150 Attack. This is what the Modern adds that the Pirc cannot: a fast queenside attack while keeping the f6-square empty. Tiger Hillarp Persson's book “Tiger's Modern” is the definitive guide.
- Analyze your Modern games for free. The Modern is a strategic opening where one inaccurate move-order choice can ruin an entire game. You need to verify that you picked the right system against White's setup, timed your breaks (...c5, ...e5, ...b5) correctly, and didn't give up the g7-bishop without a concrete reason. Export your PGN and use chess.rodeo for full Stockfish analysis — see exactly which system the engine recommended, whether your ...b5 push was a tempo too slow, and how Stockfish evaluates your Bg7's contribution. No account, no paywall, unlimited depth.
Frequently Asked Questions
What is the Modern Defense?
The Modern Defense (or Robatsch Defense) is the chess opening 1.e4 g6 — Black immediately fianchettoes the dark-squared bishop and delays every other commitment. From this start, Black can choose between four middlegames: Standard Modern (Pirc-style), Tiger Modern (queenside expansion), Hippopotamus (double fianchetto), or Sniper (Sicilian-style ...c5). It is in the same hypermodern family as the Pirc and the King's Indian.
Modern Defense vs Pirc Defense — what's the difference?
Move order. The Pirc commits to ...Nf6 on move 2 (1.e4 d6 2.d4 Nf6). The Modern delays ...Nf6 indefinitely. That one difference unlocks three extra Modern systems (Tiger, Hippopotamus, Sniper) and sidesteps the 150 Attack — the Pirc's most dangerous line. The cost is that White can play 3.c4 reaching King's Indian structures the Pirc rules out. Play the Pirc for simplicity, the Modern for flexibility.
Is the Modern Defense good for beginners?
Better for intermediate players (1400+) than absolute beginners. The Modern requires choosing between four different middlegame structures on move 3 or 4 — a strategic decision that needs experience. Pure beginners should start with the Caro-Kann or Scandinavian — fewer decisions, easier to play correctly.
What is the Hippopotamus and does it actually work?
The Hippopotamus is the most provocative Modern setup — every piece on the second rank, every pawn one square out, no center commitment. It is unsound by computer evaluation (~+0.6 for White) but devastatingly effective against opponents who don't know how to break it. Spassky used it twice against Petrosian in 1966 (both drawn). Play it as a surprise weapon below 2000 — many opponents will overextend and self-destruct. Against careful play, it requires precise defense.
Which grandmasters play the Modern Defense?
Boris Spassky (Hippopotamus vs Petrosian 1966), Tigran Petrosian, Tiger Hillarp Persson (built his career around the Tiger Modern), Hikaru Nakamura, Richard Rapport, Baadur Jobava, and Magnus Carlsen (in rapid/ blitz). It is rare in classical world-championship play because elite players prefer Berlin or Sicilian for sharper winning chances — but it has full grandmaster respect as a surprise weapon.
Analyze your Modern games — free, no account
The Modern rewards correct system choice — picking Tiger when you should have played Standard can ruin a whole game. Export your PGN and use chess.rodeo for full Stockfish analysis. See which system the engine prefers in your exact line, whether your queenside expansion was a tempo too slow, and how Stockfish evaluates your g7-bishop's contribution. No account, no paywall, unlimited games.