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Zukertort Opening: Quiet System is a chess opening that arises after 1.Nf3 Nf6 2.e3. It is classified A05 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Zukertort Opening family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.Nf3 Nf6 2.e3.