Semi-Slav Defense: Main Line (9… O-O 10. Bb2)
1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3 Bb7 8. Bd3 Be7 9. O-O O-O 10. Bb2
The Semi-Slav Defense: Main Line is a chess opening classified as ECO D46, reached after 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3 Bb7 8. Bd3 Be7 9. O-O O-O 10. Bb2. It is a line of the Semi-Slav Defense. Black is to move.
This exact move order didn't appear in our sample of 12.6 million Lichess games: it's a rare line.
Engine evaluation: +0.28 (Stockfish, depth 36; best line 10… h6 11. Rad1 Qc7 12. Qe2 Rad8 13. Bb1)
- ECO
- D46
- Moves
- 19 plies
- FEN
r2q1rk1/pb1nbppp/1pp1pn2/3p4/2PP4/1PNBPN2/PBQ2PPP/R4RK1 b - - 6 10- PGN
1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3 Bb7 8. Bd3 Be7 9. O-O O-O 10. Bb2
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Master games
3 over-the-board games are classified under this line (White 33%, draw 34%, Black 33%). The strongest:
- GM Michal Krasenkow (2520) – GM Alexander Motylev (2595) 0-1 · II Estiko Blitz 2025 · 2025-04-24
- GM Lubomir Ftacnik (2554) – Jan Smolen (2437) 1-0 · TCh-SVK 2015-16 · 2015-11-22
- IM Ramil Faizrakhmanov (2483) – FM Alexander Timerkhanov (2401) 1/2-1/2 · TCh-RUS Rapid 2021 · 2021-10-16
Search all games of the Semi-Slav Defense: Main Line and its sub-variations
Comes from
Semi-Slav Defense: Chigorin Defense (7… Bb7 8. Bd3) 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3 Bb7 8. Bd3
More Semi-Slav Defense lines (all)
- Semi-Slav Defense: Quiet Variation (4… e6 5. Nbd2) D30
- Semi-Slav Defense: Quiet Variation (5. Nbd2 Nbd7) D30
- Semi-Slav Defense: Accelerated Move Order D31
- Semi-Slav Defense: Anti-Noteboom, Stonewall Variation D31
- Semi-Slav Defense: Anti-Noteboom, Stonewall Variation, Portisch Gambit D31
- Semi-Slav Defense: Gunderam Gambit D31
- Semi-Slav Defense: Marshall Gambit D31
- Semi-Slav Defense: Marshall Gambit, Forgotten Variation D31
- Semi-Slav Defense: Marshall Gambit, Main Line D31
- Semi-Slav Defense: Marshall Gambit, Tolush Variation D31
- Semi-Slav Defense: Noteboom Variation D31
- Semi-Slav Defense: Noteboom Variation, Abrahams Variation D31
Opening names and moves from the Lichess openings dataset; statistics from the Lichess open database, 2026-09 (CC0), sample of 12.6 million games, bots excluded; evaluations from Lichess cloud analysis (all CC0). Master games from The Week in Chess #920–#1664 by Mark Crowther, used with permission.