Queen's Pawn Game: Zukertort Variation

The Queen's Pawn Game: Zukertort Variation is a chess opening classified under ECO code D05 in the Closed & Semi-Closed Games family, arising from 1.d4 d5, including the Queen's Gambit, Slav Defense, and related systems. It is reached after 5 moves: 1. d4 d5 2. Nf3 c5 3. e3 Nf6 4. Nbd2 e6 5. b3. The resulting position leaves black to move.