The Modern Defense begins with a refusal. After 1. e4 g6 2. d4 Bg7, Black has not occupied the centre, has not pinned a knight, and has not threatened anything specific. The bishop on g7 stares at the broad white pawn centre and waits to see how big it can grow before becoming a target. With 3.Nc3, White begins to defend the centre that Black has invited him to overextend.
The Modern Defense belongs to ECO B06 and the Standard Line refers to the most common path — White’s quick central setup with knights to c3 and f3, often followed by Be3 and f3 as in a Saemisch-like structure. The opening is closely related to the Pirc Defense (which begins with …d6 before …g6) and to the King’s Indian Defense, but its character is distinct: the Modern refuses to commit to …d6 early, which gives Black more flexibility but allows White more options for the central setup.
Origins
The Modern Defense’s name comes from its hypermodern parentage. The opening’s structural argument — that the centre can be controlled from a distance rather than occupied directly — comes from the writings of Réti and Nimzowitsch in the 1920s. The Modern itself, however, became a distinct defence later. Throughout the early twentieth century, hypermodern ideas were typically expressed through the King’s Indian and the Grünfeld; the Modern’s specific move order, with …g6 before …Nf6, was treated as eccentric.
The defence became respectable in the 1960s and 1970s, when several creative grandmasters adopted it as a primary weapon. Vlastimil Hort, Anatoly Lutikov, and especially the Yugoslav grandmaster Milan Matulović used the Modern at the highest level. The Yugoslav writer Nikola Karaklajić wrote an influential book on the opening, and the line acquired a small but devoted following.
The Modern’s reputation grew further in the 1980s and 1990s. Tony Miles, the British grandmaster who famously beat Karpov with 1…a6, used the Modern Defense as one of his standard answers to 1.e4. Bent Larsen treated it as a serious defence. The line acquired the reputation it has today: not the most ambitious response to 1.e4, but a genuinely creative one whose strategic possibilities remain unexhausted.
The empty centre
The Modern’s defining feature is the empty Black centre. After 1.e4 g6 2.d4 Bg7, Black has placed no pawn on the fourth rank and no piece on the third rank. The bishop on g7 is the entire Black presence in the centre, and its influence is felt only on the long diagonal a1–h8.
White’s natural response is to occupy the centre with 3.Nc3 and follow with 4.Be3, 5.f3, and 6.Qd2 — the so-called 150 Attack, a Saemisch-style setup with kingside-castling intent. The plan is straightforward: build the broad centre, prepare O-O-O, and attack on the kingside with h4 and g4. Against this plan, Black’s responses depend on how willing he is to provoke White.
The most ambitious black plan is the so-called Hippopotamus setup — pieces on a6, b6, d6, e6, g6, h6, with no pawn beyond the third rank. This is a defensive shell that invites White to push the centre as far as he likes, with the intention of demonstrating later that the over-extended pawns are weaknesses. The Hippopotamus has been used at world-championship level (Spassky played it against Petrosian in their 1966 match) but is rare in modern grandmaster practice.
The more common modern plan involves …d6 followed by …c6 and …b5, expanding on the queenside while preparing the central break …e5 at a moment when it does the most damage. This is sometimes called the Tiger Modern, after the Swedish grandmaster Tiger Hillarp Persson, who has written extensively on the system.
Main paths
The Standard Line proper, with 3.Nc3 and the various Saemisch-style setups, is the most common modern path. White can follow with 4.Be3 (intending the kingside attack), 4.f4 (the Austrian Attack, more aggressive but theoretically less established), or 4.Bc4 (a more positional setup aiming for slow development).
The 150 Attack (named for British amateurs who used the line successfully) is the most dangerous of the modern White systems. After 3.Nc3 d6 4.Be3 a6 5.Qd2 b5, White can play 6.f3 with the plan of O-O-O and h4. Black must defend precisely, and the typical middlegame is a race between White’s kingside attack and Black’s queenside expansion.
A second path is 3.Nf3 with 4.Be2, a slower setup that aims for positional play without an immediate attack. The Standard Defense (B06 sub-line) refers to the variation in which Black answers 3.Nc3 with 3…d6 rather than retaining flexibility. The difference is subtle but matters for move-order purposes.
Historical context
The Modern Defense has never been a primary world-championship weapon. Spassky’s use of the Hippopotamus against Petrosian in 1966 is the most famous appearance of the line at that level, and it served Spassky well — he held the position against Petrosian’s careful play and went on to win the match in their later encounters. Most modern world-championship matches do not feature the Modern, because top players prefer the better-known King’s Indian and Pirc structures.
The opening’s value has always been in club and grandmaster practice. Players who use the Modern as a primary defence — including several modern English and Scandinavian grandmasters — exploit the line’s surprise value. Against opponents who do not know the specific theoretical state of the 150 Attack or the Austrian Attack, the Modern can produce decisive games even at the master level.
Magnus Carlsen has used the Modern occasionally in rapid and online play. Hikaru Nakamura uses it as part of a flexible black repertoire. The defence is most associated, in modern times, with the Swedish school — Tiger Hillarp Persson’s writing has made the Tiger Modern (with …a6 and …b5) the standard treatment for serious tournament players.
How to study it
For Black, the choice is between the structural setups. The classical Modern with …d6 and …Nf6 often transposes to the Pirc Defense, and a player who studies both openings together can switch between them based on move order. The Tiger Modern with …a6 and queenside expansion is more theoretically distinct and produces middlegames that are less explored than the Pirc.
The Hippopotamus is a historical curiosity worth knowing about but rarely worth playing. Its defensive possibilities are real but limited.
For White, the most ambitious system is the 150 Attack with Be3, Qd2, f3, and queenside castling. The Austrian Attack with f4 is more committal and theoretically less established. The slower positional systems with Nf3 and Be2 offer fewer winning chances but are easier to play.
Model games should include Spassky–Petrosian games from the 1966 match (for the Hippopotamus), several Miles and Hort games from the 1970s and 1980s, and modern Hillarp Persson practice for the Tiger Modern. The opening’s theory is less rigid than that of the King’s Indian or the Pirc, and creative play remains both possible and rewarded.
The Modern Defense’s claim is not refutation. It is provocation. Black invites White to overextend in the centre and then plays a long middlegame proving that the invitation was a trap. The defence asks Black to defend with imagination rather than with theory, and that requirement has kept it alive for sixty years.
— Editor’s desk, 23 May 2026