Polish Defense: what should Black play?

In the Polish Defense, Black faces a critical decision regarding the development of the queenside and the protection of the b5 pawn. The engine-preferred continuation is Ba6, which is played in 7.2% of recorded games and aims to defend the b-pawn while preparing to challenge the center. This move carries an evaluation of +1.38, offering a solid structural foundation compared to more aggressive alternatives.

Strategic objectives for Black

The primary goal for Black in this position is to stabilize the queenside while White maintains a central space advantage with d4 and e4. While Ba6 is the top engine choice, the most popular responses among the 32,608 recorded games are b4 and c6, each appearing in 20.4% of games. The move b4 forces the white knight to move but allows White to continue development with b4 Bd3 e6 O-O Be7 e5, resulting in an evaluation of +1.43.

White's central response

White typically responds to Black's setup by developing the light-squared bishop to d3 to bolster the center and prepare for kingside castling. In the main line following Ba6, the sequence Ba6 Bd3 e6 O-O Be7 e5 shows White seizing space and restricting Black's kingside pieces. If Black chooses c6, White often proceeds with c6 Bd3 b4 O-O d5 exd5, leading to a central confrontation where White retains a +1.52 advantage.

Alternative development paths

Black may also consider Bb7, played in 6.2% of games, which places the bishop on the long diagonal but allows White to maintain pressure after Bb7 Bd3 e6 O-O b4 Re1. The least frequent high-level choice is e6, occurring in only 2.6% of games. This move is evaluated at +1.98, as it permits White to immediately capture material or create significant pressure with e6 Bxb5 Bb7 Qe2 Nf6 e5.