Benko Gambit

The Benko Gambit (1.d4 Nf6 2.c4 c5 3.d5 b5) is the soundest pawn sacrifice in chess. Pál Benkö, a Hungarian-American grandmaster, popularised the line in the 1960s and 70s. Black gives up a pawn to open the a- and b-files, get long-term pressure on White's queenside, and seize the initiative. Unlike most gambits, the Benko's compensation lasts into the endgame - White's extra pawn is often a permanent burden, not an advantage.

Main line: Accepted (4.cxb5 a6)

White takes the pawn. After 4.cxb5 a6 5.bxa6 (or 5.Nc3 declining to take twice), Black plays 5...Bxa6 and reaches the Benko's classical setup: half-open a- and b-files for the rooks, fianchetto bishop coming to g7, pawn structure with d6 and c5 supporting the centre. The plan: develop quickly, double rooks on the a- or b-file, and let the queenside pressure do the rest.

Variations

Fully Accepted (5.bxa6 g6)

White takes both pawns and tries to consolidate. After 5...g6 6.Nc3 Bxa6 7.e4 Bxf1 8.Kxf1 d6 9.g3, White keeps the extra pawn but the king is awkward on f1 and the queenside is wide open for Black's rooks. Decades of theory agree: Black has full compensation.

Half-Accepted (5.b6)

White returns the pawn by pushing it forward. After 5.b6 Qxb6 (or 5...e6) White avoids opening the queenside files entirely. The position is calmer and gives Black less of the Benko's signature pressure, but it's also less ambitious - White isn't really fighting for an opening edge.

Declined (4.Nf3 or 4.a4)

Many White players avoid taking the pawn entirely. 4.Nf3 transposes into Benoni-style structures; 4.a4 challenges Black's b-pawn directly. Either way, the position becomes a Modern Benoni-like middlegame where Black's b5 push is less effective. Practical and avoids deep gambit theory.

Common traps

Don't trade rooks carelessly: in Benko endgames, the rooks on the a- and b-files are Black's main asset. If White can force rook trades on those files, Black's compensation evaporates and the extra pawn finally counts. Always be ready to keep at least one rook on the queenside files.

The Bg7 bishop is sacred: in the Benko, the bishop on g7 hits a1 along the long diagonal. Many Benko games are won by tactical shots involving ...Bxa1 (after the rook is overloaded) or ...Nc4 hitting b2. Never trade this bishop for nothing.

Typical plans for Black

The Benko's structural plan is one of the cleanest in chess: develop with ...Bg7, ...d6, ...Nbd7, ...O-O, ...Qa5 or ...Qb6, then double rooks on the a-file. The pressure on a2, b2, and c3 is constant. White has to defend three weak squares with no counterplay - eventually one falls, and Black wins material. In the endgame, the queenside majority converts cleanly. Many Benko games end with Black winning a pawn back at move 30 and then winning the endgame at move 60.

If you want a Black opening where you sacrifice a pawn on move three and never get it back - and still win - the Benko is the only one. The drills below cover the Accepted, Half-Accepted, and Declined.