Semi-open games

Sicilian Defense

1.e4 c5

The Sicilian Defense starts with 1.e4 c5 and is catalogued under ECO B20, in the semi-open games half of the book. The catalog indexes 388 lines inside it, grouped into 327 named variations.

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Current setup

Move ideas

  1. 1.e4

    Claims the center with a pawn and opens lines for the queen and king’s bishop.

    Idea: Build quick development and make early castling possible.

  2. 1c5

    Challenges d4 from the flank instead of mirroring White’s e-pawn.

    Idea: Create an unbalanced center and active queenside counterplay.

  3. 2.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.

  4. 2d6

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

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

  5. 3.Bb5+

    Develops the bishop to b5, bringing it into the game, forcing the king to answer a check.

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

  6. 3Bd7

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

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

  7. 4.Bxd7+

    Captures the bishop on d7 and changes the local pawn or piece balance, forcing the king to answer a check.

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

  8. 4Qxd7

    Captures the bishop on d7 and changes the local pawn or piece balance.

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

  9. 5.c4

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

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

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 Sicilian Defense. Open one to load it on the board and keep exploring from that position.

303 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 Sicilian Defense.