ECO E73
King's Indian Defense: Averbakh Variation
Also known as: KID, Averbakh System
The Averbakh Variation is a King's Indian Defense system reached after 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5, when White pins the f6-knight before Black can play the freeing ...e5. Named after Yuri Averbakh, it aims to take the sting out of the King's Indian by clamping the centre with space and the pin. Black usually replies with the Benoni-style ...c5, and after 7.d5 e6 8.Qd2 the players contest a slightly awkward but resilient structure full of strategic tension.
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. d5 e6 8. Qd2
Strategic ideas
White's central idea is control and restraint. By developing the bishop to g5 before playing Nf3, White pins the f6-knight and takes aim at the freeing ...e5 break that gives the King's Indian its life. With pawns on c4, d4 and e4 White enjoys a broad space advantage and can expand on either flank, while the pin makes ...e5 awkward because the advance would run into tactical possibilities on the a1-h8 diagonal. Black must therefore seek counterplay by other means, most naturally with ...c5, striking at the base of White's centre and inviting a Benoni-style transformation of the pawn structure.
After 6...c5 7.d5 e6 the centre becomes fluid. If White captures on e6 Black gains open lines and central play; if White maintains the tension with 8.Qd2, the second player can continue with ...exd5 followed by ...Re8, or ...h6 hitting the g5-bishop to clarify matters. Thematic factors include the fate of the pinned knight, the potential trade of dark-squared bishops if White plays Bh6, and Black's chances against the e4-pawn and along the half-open e-file. White's trumps are space and bishop-pair potential; Black's are piece activity, the fianchettoed bishop, and queenside pressure with ...a6 and ...b5.
Main variations
The tabiya arises after 6.Bg5 c5 7.d5 e6 8.Qd2, a flexible move preparing to meet ...h6 with Bh6 and to castle long. Black's principal try is 8...exd5 9.exd5 (or 9.cxd5) reaching a Modern Benoni structure where Black plays ...Re8, ...a6 and ...b5 for queenside counterplay while eyeing the d5-pawn. Alternatively Black delays with ...h6, when 9.Bh4 keeps the pin and White may later gain the bishop pair. Each capture on d5 leads to slightly different piece deployments, but the strategic battle over ...e5, ...b5 and the d5-square remains constant.
Black also has independent set-ups. Instead of an early ...c5 Black can prepare ...h6 and ...e5 under improved circumstances, or develop with ...Nbd7 and ...a6 aiming for a slow King's Indian build-up. White, for his part, chooses between the direct Qd2 and Bh6 plan trading the dark-squared bishops, a kingside pawn advance with f4 in some lines, or quiet consolidation followed by queenside expansion. Because White has not committed the knight to f3, he retains the option of Nge2 or f3 supporting the centre, which gives the Averbakh its characteristic flexibility and a slightly different feel from the Classical King's Indian.
History and background
The variation bears the name of the Soviet grandmaster Yuri Averbakh, who developed and popularised the early Bg5 plan in the 1950s as a practical way to blunt the increasingly fashionable King's Indian Defense. By delaying Nf3 and pinning the knight, Averbakh's system sidesteps the sharpest classical main lines and steers the game toward positions where White's space and restraint can be exploited. It has remained a respected weapon at every level, valued by players who prefer strategic clamping over the wild opposite-wing races of the Mar del Plata. Modern practice continues to refine Black's counterplay with ...c5 and ...b5.
Key ideas
- 6.Bg5 pins the f6-knight to restrain Black's freeing ...e5 break
- White builds a broad pawn centre on c4, d4 and e4 with extra space
- Black strikes back with the Benoni-style ...c5 against d4
- After d5 e6, tension over the d5-square and half-open e-file defines play
- Qd2 prepares Bh6 to trade dark-squared bishops and often long castling
- Black seeks queenside counterplay with ...a6 and ...b5, targeting d5 and e4
Typical plans
White
- Maintain the pin with Bg5-h4 and pressure the f6-knight
- Play Qd2 and Bh6 to exchange the strong g7-bishop
- Clamp the centre with d5 and expand where Black is weakest
- Castle long and consider a kingside pawn storm in some lines
- Use the c4/e4 space to restrain ...e5 and ...b5 counterplay
Black
- Challenge the centre immediately with ...c5 and ...e6
- Transform into a Modern Benoni and play ...Re8, ...a6, ...b5
- Break the pin with ...h6 and reroute pieces for ...e5
- Pressure d5 and e4 with pieces and the half-open e-file
- Generate queenside play with ...a6, ...b5 and minor-piece activity