Polish Opening: Zukertort System

1.
1. Nf3
2. Nf6
2.
3. b4

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The Polish Opening: Zukertort System is a chess opening classified under ECO code A05 (Flank openings). It is a variation of the Polish Opening family. Step through the moves on the board above, then play the line yourself or review it with the built-in engine.