Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line

1.
1. d4
2. Nf6
2.
3. c4
4. e6
3.
5. Nc3
6. d5
4.
7. Nf3
8. Be7
5.
9. Bf4
10. O-O
6.
11. e3
12. Nbd7
7.
13. c5

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The Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line is a chess opening classified under ECO code D37 (Closed & Semi-Closed games). It is a variation of the Queen's Gambit Declined family. Step through the moves on the board above, then play the line yourself or review it with the built-in engine.