The Modern Benoni is a chess opening that begins with the moves 1.d4 Nf6 2.c4 c5 3.d5 e6. It is classified under the ECO codes A60–A79. After the initial moves, Black proceeds to capture on d5, creating a majority of black pawns on the queenside. To support their advance, the king's bishop is usually fianchettoed on g7. These two features differentiate Black's setup from the other Benoni defences and the King's Indian Defence, although transpositions between these openings are common.
Frank Marshall invented the Modern Benoni in 1927, but his experiments with the opening went largely ignored for over 20 years. In the 1950s the system was revitalized by players in the Soviet Union, chief among them Mikhail Tal. Its subsequent adoption by players of a similarly aggressive and uncompromising style such as Bobby Fischer and Garry Kasparov established the opening's reputation as one of Black's most dynamic, albeit risky, responses to 1.d4.
The Modern Benoni suffered a serious theoretical crisis in the 1980s and 1990s, when players as Black encountered great difficulties in meeting the Taimanov Attack and the Modern Main Line. Only in the 21st century has the opening's reputation and theoretical standing made a recovery. Notably, it was Vladimir Kramnik's choice when he needed a win with Black in the penultimate game of the 2004 World Championship, though that particular game resulted in a draw.
Initial moves
The standard move order for Black to enter the Modern Benoni is 1.d4 Nf6 2.c4 c5. Here it is possible for White to avoid 3.d5: respectable alternatives include 3.Nf3, typically transposing to a line of the English Opening, as well as 3.e3. Taking the pawn with 3.dxc5 is hardly ever seen, because Black easily recovers it after 3...e6 followed by ...Bxc5.
Still, 3.d5 has long been considered White's most challenging move, as it gains space in the centre. While it is possible for Black to avoid ...e7-e6 for the time being and play other moves such as 3...d6 or 3...g6, delaying this move until after White plays e2-e4 gives White the extra option of recapturing on d5 with the e-pawn. While recapturing in this fashion does not give White a central pawn majority, it maintains White's spatial advantage and denies Black the counterplay associated with possession of a queenside pawn majority. Thus players who are seeking the typical imbalance in pawn structure associated with the Modern Benoni tend to prefer the immediate 3...e6 followed by 4...exd5.
Alternative move orders and transpositions
It is possible, indeed common, for Black's second and third moves to be reversed: thus 1.d4 Nf6 2.c4 e6 3.Nc3 c5 and 1.d4 Nf6 2.c4 e6 3.Nf3 c5 will both transpose into the Modern Benoni if White allows it with 4.d5. The latter move order has been especially popular since the 1980s, as it allows Black to reach the Modern Benoni while sidestepping the Taimanov Attack. It also gives Black the additional option of meeting 4.d5 with 4...b5, the Blumenfeld Gambit. Players who use this move order will often choose a different defence against 3.Nc3, such as the Nimzo-Indian with 3...Bb4.
Another frequent transposition into the Modern Benoni occurs when White invites a Catalan Opening with 1.d4 Nf6 2.c4 e6 3.g3 and Black responds with 3...c5. If White responds with 4.d5 exd5 5.cxd5, Black can play 5...d6, which often transposes into the Fianchetto Variation; but a common alternative is 5...b5, which leads to independent positions.
Black can also try to reach the Modern Benoni through a Benoni Defence move order, i.e. 1.d4 c5 2.d5 Nf6, when 3.c4 e6 would complete the transposition. However, White often prefers not to play 3.c4, since it takes away a useful square from a white knight. Several lines of the King's Indian Defence, such as the Four Pawns Attack, the Sämisch Variation and the Fianchetto Variation, can also transpose into variations of the Modern Benoni if Black plays ...c5 followed by ...e6 and ...exd5 and White recaptures with the c-pawn.
History
thumb|upright=0.75|Frank James Marshall, inventor of the Modern Benoni
thumb|Bobby Fischer and Mikhail Tal, two pioneers of the Modern Benoni
thumb|Vugar Gashimov, a leading practitioner of the Modern Benoni
The Modern Benoni was invented by Frank Marshall at the New York 1927 chess tournament. He played it twice, gaining a draw against José Raúl Capablanca in the Fianchetto Variation, but losing soundly to Aron Nimzowitsch, who played the Knight's Tour. Nimzowitsch received the third special prize of the tournament for this game and labelled Marshall's opening an "unfortunate" "extravagance" in his annotations; as a result, it lay virtually abandoned for decades. However, Karel Hromádka's experiments with the Benoni Defence in the 1930s occasionally featured the moves ...e7-e6 and ...exd5, resulting in a transposition to the Modern Benoni.
Only in the 1950s was interest in the system revived, when the King's Indian Defence gained in popularity among Soviet players and their investigations branched into related opening systems such as the Modern Benoni. The imbalance inherent in its pawn structure and the counter-chances this implied for Black appealed to aggressive players such as Rashid Nezhmetdinov and Alexander Tolush; the Israeli master Moshe Czerniak also employed it frequently. Lev Polugaevsky, Boris Spassky and Alexey Suetin were among the younger generation of Soviet players who used it regularly in the 1950s and 1960s.
But the player primarily responsible for elevating the Modern Benoni to the status of a major opening was Mikhail Tal, who took up the opening in 1953 after seeing one of Nezhmetdinov's games. The tactical positions it led to were a perfect fit for Tal's combinatorial gifts and he crushed many opponents in brilliant style. Famous examples include his game against Bukhuti Gurgenidze at the 1957 USSR championship, excerpted below, and his win against Yuri Averbakh at the same tournament the following year.
He also became the first player to use the Modern Benoni in a world championship match, playing it twice against Mikhail Botvinnik in 1960. Former World Champion and opening authority Max Euwe acknowledged Tal's contribution to the opening by naming it the "Tal-System" in his 1965 opening encyclopedia.
These developments did not go unnoticed outside the Soviet Union: the name "Modern Benoni" had appeared in print by 1955. In the 1960s Larry Evans began employing the system frequently, and from 1966 onwards, Bobby Fischer also included it in his repertoire, albeit as a secondary weapon. Even so, Fischer was responsible for one of the most famous games ever played with the opening: down 2–0 in the 1972 World Championship match, he answered Spassky's 1.d4 with the Modern Benoni in Game 3 and scored a momentum-changing victory.
The successes of Tal and Fischer inspired a new generation of players to take up the Modern Benoni in the 1970s and 1980s, including Walter Browne, Ljubomir Ljubojević, John Nunn, Dragoljub Velimirović, Lev Psakhis, Mihai Șubă and Nick de Firmian. The young Garry Kasparov also had the defence in his arsenal—his win against Viktor Korchnoi at the 1982 Lucerne Olympiad
was considered the highlight of the tournament and remains one of the most famous games ever played in the opening. It became a favoured weapon for players needing to win against 1.d4: for example, Psakhis used it to defeat Yuri Razuvaev in the penultimate round of the 1980 USSR Championship,
catching Alexander Beliavsky in the lead and ultimately sharing first place with him.
But in the early 1980s, White scored several crushing victories at high-profile tournaments using the aggressive Taimanov Attack, which caused players to question the fundamental soundness of Black's opening. By the end of the decade, the Modern Main Line had also emerged as a dangerous weapon for White, which only compounded Black's troubles. As a result, the opening declined in popularity and a number of grandmasters gave it up altogether. Those who continued to play it often chose to do so via the move order 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5, when White's early development of the knight to f3 rules out the Taimanov Attack and gives Black opportunities to avoid the Modern Main Line.
Mired in this theoretical crisis, the Modern Benoni remained unpopular in the 1990s. Veselin Topalov was the only top-level player to play it regularly, and he too generally preferred the 2...e6 3.Nf3 c5 move order. At the beginning of the new millennium, the theoretician John Watson published a well-regarded survey of the opening that may have contributed to the opening's revival. Many of the ideas he recommended, such as 9...Qh4+ versus the Taimanov Attack and 9...Nh5 in the Modern Main Line, grew in popularity after its publication. The opening regained some more of its former respectability when Vladimir Kramnik, needing a win with Black against Peter Leko, played it in the second to last game of the 2004 World Championship. While he did achieve a winning position at one point, the game ended in a draw. Nevertheless, Étienne Bacrot, Boris Gelfand and Vassily Ivanchuk have all since used the Modern Benoni at the highest levels of competition, while Vugar Gashimov became the opening's most notable proponent. He was the strongest player willing to use the original 1.d4 Nf6 2.c4 c5 3.d5 e6 move order and defend Black's cause in both the Taimanov Attack and the Modern Main Line.
Strategy
The Modern Benoni is one of Black's sharpest and most active defences against 1.d4. The exchange of White's c-pawn for Black's e-pawn leaves White with a pawn majority in the centre and Black with one on the queenside. This asymmetry suggests that White will try to play on the kingside and in the centre, while Black will seek counterplay on the queenside. However, this simplistic generalization does not hold in many cases—depending on how the pieces are arranged, either side may be able to fight back on the flank where they are theoretically weaker.
The creation of such a pronounced structural imbalance so early on in the game implies that Black aims to counterattack rather than equalize. Thus the opening has acquired a reputation for being risky: as Psakhis once wrote, the Modern Benoni "is definitely not an opening for cowards." Since White's central superiority typically constitutes a positional advantage, Black must frequently resort to tactical play and material sacrifices in order not to be forced into passivity.
Black's queenside play
The game Donner–Tal, Zurich 1959, Position after 18...axb5
The central pawn majority is White's main positional trump in the Modern Benoni. By staking out an advantage in space on the kingside, it allows White to develop an initiative on that side of the board. The most important tool in White's arsenal is the e4-e5 pawn advance, which can open up lines and squares for the white pieces, and result in the creation of a passed d-pawn if Black answers with ...dxe5.
A famous example of the e4-e5 break leading to a kingside attack occurred in the game Penrose–Tal from the 1960 Leipzig Olympiad.
and Korchnoi–Tal, USSR championship, Yerevan 1962.
Black's kingside play
The half-open e-file gives Black a certain degree of influence over the kingside. A rook on e8 puts pressure on White's e-pawn and restrains it from advancing. Tactics involving ...Nxe4 are not uncommon—the games Averbakh–Tal, USSR championship, Riga 1958, are well-known examples. Black can initiate further kingside activity by playing ...Nd7-e5 followed by ...g7-g5. The pawn move prevents White from driving away the knight with f2-f4, and sets up the possibility of Black bringing a knight on f4 via g6 or h5. Further space-gaining pawn advances such as ...g5-g4 and ...f7-f5 may even be possible.
En route to winning his first USSR championship, Tal provided a brilliant example of how Black's dark-square control could lead to a kingside attack. Against Gurgenidze at the 1957 championship in Moscow, Position after 21...b5
When Black prepares the ...b7-b5 pawn break with ...a6, White usually tries to hinder it by playing a2-a4, even though this advance weakens the b4-square. As a further deterrent to Black's queenside expansion, White often moves the knight on f3 to c4 via d2. With the knight on c4, Black's ...b7-b5 break may be met by axb5 followed by Na5, when the arrival of a white knight on c6 could severely disrupt Black's position. The knight on c4 also attacks Black's backward pawn on d6, and White can often increase the pressure on this pawn by playing Bf4 or Nb5. The strength of White's knight on c4 often induces Black to exchange it off: typical ways of doing so are ...Nb6, ...Ne5, or ...b7-b6 followed by ...Ba6.
Even if Black should succeed in enforcing the ...b7-b5 break, White may halt the b-pawn's further advance by simply playing b2-b4. Even though this would give Black the opportunity to establish a passed c-pawn with ...c5-c4, blockading the queenside in this manner may allow White to pursue play in the centre and on the kingside undisturbed. The ...c5-c4 advance would also relinquish Black's control over the d4-square, which may be occupied to good effect by a white knight or bishop.
A successful demonstration of this last idea occurred in the game Pintér–Brynell at the 1998 Elista Olympiad. where Black intends to attack White's centre with ...f5. Alternatively, if White immediately completes the knight manoeuvre and attacks the pawn on d6 with 8.Nc4 0-0 9.Bf4, Black can either defend it with 9...Ne8 or sacrifice it with 9...Na6 or 9...b6.
7.Bf4
The move 7.Bf4 is similar in spirit to 7.Nd2, in that White hopes to inconvenience Black by a quick attack on d6. After 7...Bg7 8.Qa4+! Bd7 9.Qb3 White attacks both b7 and d6, and Black must be careful not to drift into a passive position after 9...Qc7 10.e4 0-0.
More commonly Black prefers to rule out White's queen check with 7...a6, which incidentally threatens to expand on the queenside. White can ignore this with 8.e4 b5 9.Qe2, aiming to quickly overrun Black in the centre with the e4-e5 advance. However, 8.a4 Bg7 is the most popular continuation, when White can aim for a transposition to the Classical Main Line with 9.e4. Another possibility is 9.h3 0-0 10.e3, which gives the bishop a retreat square in case of ...Nh5 and delays further expansion in the centre until the White's development is complete. Although a number of opening books recommended the 7.Bf4 variation for White in the early 21st century, Black appears to be able to maintain the balance in this line.
7.Bg5: Uhlmann Variation
The variation with 7.Bg5 is named after Wolfgang Uhlmann, who played it a few times in the 1960s. Botvinnik also employed it in his 1960 world championship match against Tal. By pinning the knight, White aims to transpose into favourable lines of the Averbakh Variation of the King's Indian Defence, which may occur after 7...0-0 8.Nd2!. To prevent this, Black can either break the pin immediately with 7...h6 8.Bh4 g5 9.Bg3 Nh5, or after developing with 7...Bg7 8.e4 h6 9.Bh4. At this point 9...g5 10.Bg3 Nh5 runs into the pawn sacrifice 11.Bb5+ Kf8 12.e5! when White has a dangerous attack, and in the late 1970s this line was even thought to have refuted the Modern Benoni. Later it was realized that Black can prevent the bishop check with 9...a6!: the only way White can forestall ...g5 and ...Nh5 is with 10.Nd2, but this allows Black to expand on the queenside with 10...b5 and reach a satisfactory position.