Sicilian Defense: Kan Variation

Strategic Summary & Main Idea

The Kan is the most flexible of the open Sicilians: after 4.Nxd4 a6, Black develops no piece and keeps the choice between the bishop on c5, e7 or d6, the knight on f6, c6 or e7, and the queen on c7. The position after 4...a6 measures +0.50, and the flexibility has a price — half a pawn, in the range of the open Sicilians. The entry's useful figure is that the Maróczy, with 5.c4, reputed to be the most awkward test, measures +0.23, and that White's two attempts to win material in the opening measure against White: 6.e5 loses at −1.30, and the capture on g7, −0.32.

The pawn structure this opening produces

The Kan comes from the typical open Sicilian structure: White has traded the d-pawn for the c-pawn and has a central pawn on e4 against Black's e6 and d7 pawns, which control d5 and f5. What defines the Kan is the pawn on a6, played before any piece. It prevents Nb5 and Bb5, prepares ...b5 and ...Bb7 against e4, and leaves every other decision open. White chooses between three structures. With 5.Bd3, the bishop defends e4 and prepares c4, and the position stays closed and manoeuvring. With 5.c4, White sets up the Maróczy: the c4 and e4 pawns take d5 from Black for good, but d4 becomes weak and a Black bishop pinning c3 with ...Bb4 finds a target. With 5.Nc3, White keeps the game open, and Black answers with ...Qc7 or ...b5. In all of them, Black's break is ...d5 — which only works when the e4 pawn cannot advance to e5 with tempo — and Black's weakness is the d6 square, left without a pawn since ...e6.

Main Variations of the Sicilian Defense: Kan Variation

Evaluations measured by us with Stockfish 19, depth 22, on 15/09/2026.

Frequently asked questions

What is the difference between the Kan and the Taimanov?

The fourth move. In the Kan Black plays 4...a6 and develops no piece; in the Taimanov Black plays 4...Nc6 and develops the knight. The Kan is more flexible — the b8 knight can go to d7 or c6 later — and avoids White's Nb5 lines, but gives White more freedom to choose the structure.

Is the Maróczy the best test against the Kan?

Not by the measurement. 5.c4 Nf6 6.Nc3 Bb4 7.Bd3 measures +0.23, the lowest evaluation in this entry. The 5.Bd3 lines measure between +0.51 and +0.73, and they are the ones that cost Black most. The Maróczy takes d5, but the pin on c3 gives Black the play the space took away.

Why is 6.e5 a mistake against the Kan?

Because Black's queen checks on a5 and attacks the pawn at the same time. After 5.Bd3 Nf6 6.e5 Qa5+, White cannot defend e5 and get out of check without losing material, and the position measures −1.30. It is the typical mistake of treating the Kan as a Sicilian without an active queen.

Guides on this opening

• The Sicilian Kan: a guide to 4...a6, its plans and what the move costs

Common Mistakes & Where Most Amateurs Go Wrong

• 01 Pushing 6.e5? against 5.Bd3 Nf6. The pawn attacks the knight, but 6...Qa5+ gives check and hits e5 at the same time, and White loses the pawn with a disorganised position: −1.30. The line: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 Nf6 6.e5 Qa5+ −1.30
• 02 Taking the g7 pawn with 8.Qxg7? after 5.Bd3 Bc5 6.Nb3 Ba7 7.Qg4 Nf6. The queen wins the pawn, but 8...Rg8 9.Qh6 opens the g-file and leaves f2 under the a7 bishop: the engine answers 9...Bxf2+ and the position measures −0.32. The line: 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 Bc5 6.Nb3 Ba7 7.Qg4 Nf6 8.Qxg7 Rg8 9.Qh6 −0.32