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Chess openings

Opening family

Sicilian Defense Lines and Variations

The Sicilian Defense family contains 385 named lines in this opening book, spanning ECO B20 to B99. Use this page as the map, then open individual lines for exact move orders and diagrams.

Named lines
385
ECO coverage
B20, B21, B22, B23 ... B97, B98, B99
ECO volume
B (semi-open games, especially Sicilian, Caro-Kann, Pirc, Alekhine, and related systems)
Shortest line
B20 Sicilian Defense: 1. e4 c5

How to study this family

White

White usually tries to turn the first-move initiative into direct pressure before Black finishes queenside development.

Black

Black accepts asymmetry from move one, fighting for central counterplay and often using the c-file as a long-term asset.

Start with the shortest line, then branch to the variations that change the pawn structure or tactical target. Memorizing every branch before understanding the family plan is usually wasted work.

Main named lines

Deep theory branches

Start with the root lineDrill this family