Closed games

Semi-Slav Defense

1.d4 d5 2.c4 e6 3.Nc3 c6

The Semi-Slav Defense starts with 1.d4 d5 2.c4 e6 3.Nc3 c6 and is catalogued under ECO D31, in the closed games half of the book. The catalog indexes 69 lines inside it, grouped into 49 named variations.

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Current setup

Move ideas

  1. 1.d4

    Takes central space with a protected pawn and frees the queen’s bishop.

    Idea: Build a stable center that supports a broad positional setup.

  2. 1d5

    Mirrors White’s central claim and prevents an easy e4 expansion.

    Idea: Establish a firm center and develop behind the pawn chain.

  3. 2.c4

    Advances the c-pawn to gain queenside space and control new squares.

    Idea: Create useful wing space while keeping the central structure flexible.

  4. 2c6

    Advances the c-pawn to gain queenside space and control new squares.

    Idea: Create useful wing space while keeping the central structure flexible.

  5. 3.Nf3

    Develops the knight to f3, bringing it into the game.

    Idea: Improve piece coordination and clear the back rank for castling and the rooks.

  6. 3Nf6

    Develops the knight to f6, bringing it into the game.

    Idea: Improve piece coordination and clear the back rank for castling and the rooks.

  7. 4.Nc3

    Develops the knight to c3, bringing it into the game.

    Idea: Improve piece coordination and clear the back rank for castling and the rooks.

  8. 4e6

    Advances to e6 to claim central space and control nearby key squares.

    Idea: Give the pieces room to develop behind a durable central foothold.

  9. 5.Bg5

    Develops the bishop to g5, bringing it into the game.

    Idea: Improve piece coordination and clear the back rank for castling and the rooks.

  10. 5Nbd7

    Develops the knight to d7, bringing it into the game.

    Idea: Improve piece coordination and clear the back rank for castling and the rooks.

  11. 6.e3

    Advances to e3 to claim central space and control nearby key squares.

    Idea: Give the pieces room to develop behind a durable central foothold.

  12. 6Qa5

    Repositions the queen to a5, where it influences a new part of the board.

    Idea: Coordinate threats carefully while avoiding unnecessary tempi against the queen.

  13. 7.cxd5

    Captures the pawn on d5 and changes the local pawn or piece balance.

    Idea: Open lines in the center and reshape the center for the next phase.

  14. 7Nxd5

    Captures the pawn on d5 and changes the local pawn or piece balance.

    Idea: Remove an active defender and improve the moving piece’s influence.

Book continuations

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0 moves
This is the end of the indexed line.

Named variations

Each line below is an indexed entry under Semi-Slav Defense. Open one to load it on the board and keep exploring from that position.

25 more named lines sit inside this family — the tree above walks all of them.

ECO groups openings by the structures they lead to, so these families tend to share plans with the Semi-Slav Defense.