Sicilian Defense: what to play after c5?

The Sicilian Defense, categorized under ECO code B20, arises after the moves e4 c5. In this position, the most statistically successful and popular continuation for White is Nf3, which has been played in 398 million recorded games and maintains an engine evaluation of +0.24. This move prepares the central break d4 while developing a minor piece toward the center, accounting for 54.0% of all games from this position.

The dominance of Nf3

The move Nf3 is the standard approach to the Open Sicilian. By placing the knight on the f3 square, White prepares to support the d4 push, which aims to trade the e4 for Black's c5 to gain space and rapid development. According to database records, White scores 50.1% with this continuation. The main line typically proceeds with Nf3 Nc6 d4 cxd4 Nxd4 Nf6, leading to highly theoretical and sharp middlegame structures.

Closed and Anti-Sicilian alternatives

Players seeking to avoid the heavy theory of the Open Sicilian often opt for Nc3, known as the Closed Sicilian. This move is played in 10.3% of games (76 million recorded) and carries a slightly higher win rate for White at 51.3%, with an engine evaluation of +0.23. Another common alternative is the Alapin Variation via c3, played in 5.4% of games. The Alapin aims to establish a solid pawn center immediately, often following the line c3 Nf6 e5 Nd5 d4 cxd4.

Direct central challenges

The immediate d4, known as the Smith-Morra Gambit or the Mediterranean Variation depending on subsequent moves, is seen in 8.8% of games. While the engine evaluates this at +0.06, it remains a frequent choice for aggressive players, scoring 50.7% for White. A less common but viable developmental move is Ne2, which carries an evaluation of +0.11 and often transposes into lines involving Ne2 Nf6 Nbc3 a6 e5 Ng4.