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Zukertort Opening is a chess opening that arises after 1.Nf3. It is classified A04 in the ECO system, and the position after these moves has black to move.
This position can also be reached by 3 other move orders, including 1.Nf3 d5.
Each of these is a named opening reached by playing on from 1.Nf3. Open any of them to load the position on the board.