The Polish Defence arises after 1.d4 b5. ECO code: A40.

Overview

This rare and provocative defence mirrors the Polish Opening (1.b4) with reversed colours. Black immediately advances the b-pawn, planning to fianchetto the queen's bishop.

Strategic Themes & Plans

Black aims for Bb7 and long-diagonal pressure, but the early b5 advance weakens the queenside and wastes time on a flank operation while the centre is uncontested. White should respond with e4, seizing the centre, and aim for natural development. The defence is considered dubious and is virtually unseen at the master level.