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Polish Opening: Queenside Defense is a chess opening that arises after 1.b4 e6 2.Bb2 Nf6 3.b5 a6. It is classified A00 in the ECO system, and the position after these moves has white to move.
This line is a variation within the Polish Opening family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.b4 e6 2.Bb2 Nf6 3.b5 a6.
Each of these is a named opening reached by playing on from 1.b4 e6 2.Bb2 Nf6 3.b5 a6. Open any of them to load the position on the board.