Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line
Overview
Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense, Blockade Line is a gambit, classified under ECO code D37 within the Closed & Semi-Closed Games family. As with all gambits, one side sacrifices material early — usually a pawn — in exchange for development, open lines, or initiative.
The Closed & Semi-Closed Games group covers closed and semi-closed games — 1.d4 systems characterised by long strategic manoeuvring rather than early tactics.
It is reached after 13 plies of play, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 Be7 5. Bf4 O-O 6. e3 Nbd7 7. c5.
Step through the moves on the interactive board below, review the live Lichess statistics, or play this position against Stockfish at one of six difficulty levels.
- ECO code
- D37
- Group
- Closed & Semi-Closed Games (D)
- Plies
- 13
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Statistics from Lichess
33,850 games · White 54.0% / Draw 7.2% / Black 38.8%
| Moves | Games | W / D / B |
|---|---|---|
| c6 | 20,194 | |
| Nh5 | 5,255 | |
| b6 | 3,847 | |
| Ne4 | 2,298 | |
| Re8 | 866 | |
| a5 | 556 | |
| a6 | 503 | |
| h6 | 207 |
Source: Lichess Opening Explorer · cached 2026-09-26 02:51:36
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