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ECO B20Semi-open game

Sicilian Defense

Answer not with a mirror, but with a strike from the side

  • Sharp play
  • Asymmetry

The Sicilian Defense begins 1.e4 c5, and is statistically Black's most successful reply to 1.e4 at every level of competitive play.

Interactive Opening Board

5.Nc3

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Black
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White
5.Nc3
Speed:

Moves

(9 plies • 5 moves)
5.Nc3Tabiya

The knight covers e4 and completes development. Now Black reaches a fork: …a6, …g6, …e6 or …Nc6.

  1. 1–5moves
  2. 1.
  3. 2.
  4. 3.
  5. 4.
  6. 5.

Defining move

1…c5! — a strike from the side

The move that sets the Sicilian apart from every other answer to 1.e4

After 1…e5 Black builds the same chain as White and the game mirrors itself. The c5 pawn breaks the symmetry: it hits d4, prepares to trade for a central pawn and opens the c-file. White cannot calmly build a big centre, and Black gets a plan of its own.

Tabiya

The Open Sicilian

The position from which the whole Sicilian theory grows. White has a knight on d4 and a pawn on e4; Black has a pawn on d6 and a knight on f6. Now Black chooses the character of the game: …a6 leads to the Najdorf, …g6 to the Dragon, …e6 to the Scheveningen, …Nc6 to the Classical system. Four moves, four entirely different worlds.

The centre

A central pawn against a wing pawn

White keeps the e4 pawn, Black the d6 pawn. Black gets the central majority (d and e pawns against one), White the queenside majority (a, b, c against a, b). So White usually attacks on the kingside while Black presses along the c-file.

Key squaresd4d5e5

Outposts

  • d4White's key knight

    From here the knight bears on b5, e6 and f5. Black tries to trade it off, White to keep it.

  • d5The hole in the centre

    Without a pawn on e6 the d5 square is weak. A white knight on d5 can be very strong, which is why Black so often plays …e6 or …d5.

Thematic breaks

  • d5Black

    The freeing strike …d6-d5

    Trade off the e4 pawn and take away White's central edge.

    What follows: The centre opens and Black equalises. That is why White does everything to prevent it, or attacks first.

  • g4White

    The kingside pawn storm

    Drive Black's pieces from the kingside and open lines towards the king.

    What follows: The game becomes a race: while White storms, Black must create counterplay on the c-file in time.

  • b5Black

    The …b7-b5 thrust

    Push White's pieces back, win space and attack if the White king has gone to the queenside.

    What follows: Both kings come under fire, and the more accurate calculator wins.

White’s plan

  • Develop quickly: Be3, f3 or f4, Qd2, then castle, often long.
  • Attack on the kingside with the f, g and h pawns.
  • Keep Black from the freeing …d5, and strike first when it is being prepared.

Black’s plan

  • Use the c-file: put a rook on c8 and press on c2.
  • Counterattack on the queenside with …a6, …b5, …Qc7.
  • Choose the structure to taste: …e5 with a hole on d5, …e6 with a flexible chain, or …g6 with a bishop on the long diagonal.

History

The Italian Giulio Polerio left the first written analysis of the move in the late sixteenth century. The Sicilian was taken up seriously in the La Bourdonnais–McDonnell matches of 1834. It found a second life in the middle of the twentieth century, when Soviet masters, followed by the Argentine Miguel Najdorf, Bobby Fischer and Garry Kasparov, made it Black's main weapon against 1.e4. In 1985 Kasparov won the last game of his match with it and became world champion.

The Sicilian Defense begins 1.e4 c5, and is statistically Black's most successful reply to 1.e4 at every level of competitive play. Rather than meeting White's central pawn symmetrically, Black creates an immediate imbalance: White typically gains a central space advantage, while Black gains active piece play and a semi-open c-file for a rook, often aiming to counterattack on the queenside while White attacks on the kingside. The Sicilian branches into many distinct systems named for the pawn structures and plans they produce — the Najdorf, the Dragon, the Scheveningen, and others — each with its own strategic character, which is why the Sicilian alone accounts for a large share of published opening theory.

Written: 2026-09-19
Ruy Lopez (Spanish Opening)All OpeningsGrünfeld Defense

Legends who played it