Tree path 7 levels Queen's Pawn Game › Queen's Gambit › Queen's Gambit Declined › Queen's Knight Variation › Semi-Slav Defense: Accelerated Move Order › Semi-Slav Defense: Noteboom Variation › Queen's Gambit Declined: Semi-Slav, Koomen Variation
- Chess Codex
- Queen's Pawn Game D00
- Queen's Gambit D06
- Queen's Gambit Declined D30
- Queen's Knight Variation D31
- Semi-Slav Defense: Accelerated Move Order D31
- Semi-Slav Defense: Noteboom Variation D31
- Queen's Gambit Declined: Semi-Slav, Koomen Variation D31 you are here
Queen's Gambit Declined: Semi-Slav, Koomen Variation
Overview
Queen's Gambit Declined: Semi-Slav, Koomen Variation is a sacrificial opening line filed under ECO D31 in the Closed & Semi-Closed Games group. The defining idea is the early concession of material to seize the initiative and unbalance the position.
The Closed & Semi-Closed Games group covers closed and semi-closed games — 1.d4 systems characterised by long strategic manoeuvring rather than early tactics.
Play reaches this position via 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. e3 b5 6. a4 Bb4 7. Bd2 Qe7, after 14 plies of opening development.
In the opening tree, this line branches off from Semi-Slav Defense: Noteboom Variation, part of the broader Queen's Pawn Game system.
Use the board to walk through every move, check how the position has scored on Lichess, or take it head-to-head against Stockfish.
- ECO code
- D31
- Group
- Closed & Semi-Closed Games (D)
- Plies
- 14
This overview is generated automatically from the opening's metadata. Know this line well? Write a description — submissions are reviewed before publishing.
Statistics from Lichess
884 games · White 37.6% / Draw 6.8% / Black 55.7%
| Moves | Games | W / D / B |
|---|---|---|
| axb5 | 628 | |
| Ne5 | 90 | |
| b3 | 78 | |
| Be2 | 44 | |
| Rb1 | 13 | |
| Ne4 | 10 | |
| Qc2 | 9 | |
| Qb1 | 5 |
Source: Lichess Opening Explorer · cached 2026-09-26 02:59:43
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Submissions are reviewed before publishing.