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Tree path 5 levels Queen's Pawn Game › Queen's Gambit › Slav Defense › Slav Defense › Semi-Slav Defense: Main Line
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  2. Queen's Pawn Game D00
  3. Queen's Gambit D06
  4. Slav Defense D10
  5. Slav Defense D10
  6. Semi-Slav Defense: Main Line D45 you are here
D45

Semi-Slav Defense: Main Line

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Overview

Semi-Slav Defense: Main Line is a specific line in the Closed & Semi-Closed Games family (ECO D45), arising from a recognised theoretical 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.

It begins with 9 plies and takes 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 to reach the canonical position.

The line refines Slav Defense, which traces back to the root opening Queen's Pawn Game.

The line splits into 2 documented sub-systems: Semi-Slav Defense: Accelerated Meran Variation, Semi-Slav Defense: Normal Variation.

Together the deeper variations number 27 across the full subtree.

Explore the position on the interactive board, study its real-world results from Lichess, and challenge the engine when you are ready.

ECO code
D45
Group
Closed & Semi-Closed Games (D)
Plies
9
Parent
Slav Defense
Direct variations
2
Total in subtree
27

This overview is generated automatically from the opening's metadata. A more detailed, human-written description is on the way — and you can speed it up by suggesting one yourself.

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Variations (2)

Related variations at the same level

Sister lines that share the same parent Slav Defense:

Show all 27 sub-variations (full subtree)

https://test.av-webdevs.com/openings/semi-slav-defense-main-line