D45 · Semi-Slav Defense
Semi-Slav Defense: Main Line
1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3
In the Semi-Slav Defense: Main Line, aim to understand the plans and pawn structures, not just memorize the first moves.
The Semi-Slav Defense: Main Line is a chess opening classified under ECO code D45. It is reached after the moves 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3: 9 moves in, with Black to play.
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.
Club players rarely lose the Semi-Slav Defense: Main Line in the opening itself. They lose it a few moves later, when the plan behind the moves runs out: that is what reading your own games in this line shows you.
Play the Semi-Slav Defense: Main Line? See where you go wrong.
Deepline reviews your real games, finds the exact moves that cost you, and trains the fixes.
Analyze my games free →Related openings
Semi-Slav Defense: Quiet VariationSemi-Slav Defense: Quiet VariationSemi-Slav Defense: Accelerated Move OrderSemi-Slav Defense: Anti-Noteboom, Stonewall Variation, Portisch GambitSemi-Slav Defense: Gunderam GambitSemi-Slav Defense: Marshall GambitSemi-Slav Defense: Marshall Gambit, Forgotten VariationSemi-Slav Defense: Marshall Gambit, Main LineSemi-Slav Defense: Marshall Gambit, Tolush VariationSemi-Slav Defense: Noteboom Variation