Benko Gambit - Modern Fianchetto with b3
A modern system to reduce Benko pressure: fianchetto on g2, b3 and Bb2 to oppose the g7 bishop, and the knight on h3 heading for f4. Black keeps his play on the files and looks for the ...c4 break.
1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.g3 d6 7.Bg2 g6 8.b3 Bg7 9.Bb2 O-O 10.Nh3 Nbd7 11.O-O Qb6 12.Bc3
Move by move
- 1.d4 – White occupies the centre with the queen's pawn and frees the c1 bishop. Against 1.d4 this course offers two systems based on ...c5: the Benko and the Benoni.
- 1...Nf6 – A flexible move: it controls e4, stops 2.e4 and does not yet reveal the structure. It is better to wait for 2.c4 before ...c5, so that White cannot answer with a comfortable e2-e4.
- 2.c4 – White gains space and controls d5. However, the c4 pawn will support a future pawn on d5: it is exactly the target the Benko will hit with ...b5.
- 2...c5 – Black hits d4 at once. After 3.Nf3 cxd4 the structures become symmetrical; the main reply is 3.d5, which gains space but creates the c4-d5 chain that Black will undermine.
- 3.d5 – White advances, gaining space and taking c6 away from the b8 knight. Now the d5 pawn depends on c4: Black can choose between ...b5 (Benko) and ...e6 (Benoni).
- 3...b5 – The Benko Gambit: Black offers the b-pawn to undermine c4, the support of d5. If White accepts, after ...a6 the a- and b-files open for Black's rooks.
- 4.cxb5 – White accepts the pawn, the most direct choice. Black is in no hurry to win it back: he offers the a-pawn too in order to open lines.
- 4...a6 – Black offers a second pawn. After 5.bxa6 the bishop recaptures on a6, developing with tempo, and the a- and b-files become highways for the rooks against a2 and b2.
- 5.bxa6 – White accepts the second pawn too. He stays a pawn up, but Black gets quick development and two half-open files on the queenside.
- 5...Bxa6 – The bishop recaptures, developing on the a6-f1 diagonal: if White plays e4, the exchange ...Bxf1 takes away his castling. The a-file is already open for the a8 rook.
- 6.g3 – White opts for the fianchetto at once: the bishop goes to g2 and the ...Bxf1 exchange will not be possible. The g1 knight stays flexible.
- 6...d6 – Black reinforces c5 and controls e5, as in all Benko lines, preparing ...g6 and ...Bg7.
- 7.Bg2 – The bishop settles on the long diagonal, protects d5 and covers the king. White can choose between Nf3 and Nh3 depending on his plans.
- 7...g6 – Black prepares his own fianchetto: the bishops on g7 and g2 will face each other along the long diagonals.
- 8.b3 – The modern system: White prepares Bb2 to neutralise the g7 bishop and protects c4. In return the a2 pawn remains weak on the a-file.
- 8...Bg7 – The bishop takes the diagonal despite the coming opposition: if White exchanges bishops, Black's king loses a defender but White also loses control of the dark squares.
- 9.Bb2 – White opposes his bishop on the a1-h8 diagonal: this is the heart of the system, reducing Black's pressure on b2 and c3.
- 9...O-O – Black castles before choosing his plan. White has not developed his knights yet: Black wants to exploit this delay with ...Nbd7 and ...Qb6.
- 10.Nh3 – The knight goes to h3 instead of f3: it does not block the g2 bishop's diagonal and can continue to f4, from where it supports d5 and controls e6.
- 10...Nbd7 – The knight develops and controls e5 and c5. It can go to e5 or b6, and it frees b8 for a rook.
- 11.O-O – White castles. His b1 knight is still at home: it will go to d2 or c3, but meanwhile Black can increase the pressure on the queenside.
- 11...Qb6 – The queen vacates d8 to connect the rooks and presses down the b-file against b3 and along the diagonal towards the king. It prepares ...Rfb8.
- 12.Bc3 – The bishop leaves the b-file, where it could become a target for Black's rooks, and keeps opposing the g7 bishop. Now it is Black's turn to choose how to increase the pressure.
How to exploit the position
White is a pawn up with a solid position, but b3 has weakened c3 and the a2 pawn, and the b1 knight is not developed yet.
- ...Rfb8 doubles the pressure on the b-file against b3, supported by the b6 queen.
- The ...c4 push attacks b3 and opens lines: the a6 bishop supports it and a knight on e5 can reach c4 or d3.
- The f6 knight can go to e4 to challenge the c3 bishop and free the g7 bishop's diagonal.
- Watch the h3 knight heading for f4: from there it supports d5 and threatens to land on e6.
Master tips
Exploit the development lag
In this system the b1 knight stays at home for a long time: this is the moment to bring the queen and rooks to the queenside.