Queen's Gambit Declined: Harrwitz Attack 9…Qa5 10. O-O-O
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Statistics from Lichess
1,275 games: White 50.7% / Draw 6.2% / Black 43.1%
| Next move | Games | White / Draw / BlackW / D / B |
|---|---|---|
| 418418 | ||
| 266266 | ||
| 138138 | ||
| 130130 | ||
| 9696 | ||
| 9595 | ||
| 9090 | ||
| 1717 |
Rated Lichess games between players rated 1600 to 2500, from the Lichess opening explorer, updated Oct 29, 2026
Engine evaluation
+0.09 The position is about equal
Best play: 10... Be7 11. g4 dxc4 12. Bxc4 e5 13. g5 exf4 14. gxf6 Bxf6 15. Nd5
Stockfish 19, depth 30, after the line's last move. Scores are in pawns, from White's side.
Overview
Queen's Gambit Declined: Harrwitz Attack (ECO D37, Closed & Semi-Closed Games) is a declined gambit in the Queen's Gambit Declined: Harrwitz Attack, Main Line, reached after 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 O-O 6. e3 c5 7. dxc5 Bxc5 8. Qc2 Nc6 9. a3 Qa5 10. O-O-O (10 moves).
In 1,275 rated Lichess games between players rated 1600 to 2500, White won 50.7%, Black 43.1% and 6.2% were drawn. Black's most played move here is 10…Be7, in 33% of those games.
Written from the Lichess opening list and explorer. Know this line well? Write about it.
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How to answer 10. O-O-O
The most played answer, 10…Be7, also scores best for Black: 49.6%, with Black winning 46.4% and White 47.1% of 418 games. Of the main answers, 10…Rd8 scores lowest: 41.9%. Stockfish's first choice is also 10…Be7.
Main answers: those played in at least 5% of these games. Score: Black's wins plus half the draws, in rated Lichess games between players rated 1600 to 2500. How to play against other popular openings
Cite this page
Caissa Codex. “Queen's Gambit Declined: Harrwitz Attack (D37)”. Lichess data as of 29 Oct 2026. https://chesscodex.org/openings/queens-gambit-declined-harrwitz-attack-4