Semi-open games

Rat Defense

1.e4 d6 2.f4

The Rat Defense starts with 1.e4 d6 2.f4 and is catalogued under ECO B00, in the semi-open games half of the book. The catalog indexes 11 lines inside it, grouped into 11 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. 1d6

    Advances to d6 to claim central space and control nearby key squares.

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

  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. 2e5

    Advances to e5 to claim central space and control nearby key squares.

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

  5. 3.dxe5

    Captures the pawn on e5 and changes the local pawn or piece balance.

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

  6. 3Be6

    Develops the bishop to e6, bringing it into the game.

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

Book continuations

Waiting for Lichess game popularity.

0 moves
This is the end of the indexed line.

Named variations

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

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