D37
Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line
1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 Be7 5. Bf4 O-O 6. e3 Nbd7 7. c5
The Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line is a chess opening classified under ECO code D37. It is reached after the moves 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 Be7 5. Bf4 O-O 6. e3 Nbd7 7. c5.
It belongs to the Queen's Gambit Declined family — one of many ways the line can branch. Understanding the parent system’s plans is the fastest way to play this variation well.
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