D46
Semi-Slav Defense: Main Line
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 under ECO code D46. It is reached after the moves 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 belongs to the Semi-Slav Defense family — one of many ways the line can branch. Understanding the parent system’s plans is the fastest way to play this variation well.
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