Sicilian Defense: Modern Variations: what to play after c5?

In the Sicilian Defense: Modern Variations (ECO B50), White typically proceeds with the central break d4 to challenge Black's control of the center and open lines for the minor pieces. This move is the most frequent choice, appearing in 53.4% of recorded games, and maintains a slight engine advantage of +0.37. By playing d4, White aims to transition into Open Sicilian structures where active piece play and space advantages are prioritized.

The Central Break with d4

The move d4 is the theoretical cornerstone of this position, leading to the main line d4 cxd4 Nxd4 Nf6 Nc3 a6. With over 68 million recorded games, it remains the most successful way for White to contest the d4 and c5 squares. The engine evaluation of +0.37 reflects White's ability to secure a space advantage and rapid development, resulting in a 50.4% scoring rate from this point.

Positional Alternatives and the Moscow Variation

White may opt for Bb5+, known as the Moscow Variation, which is played in 6.8% of games. This check forces Black to interpose a piece, often leading to the sequence Bb5+ Bd7 Bxd7+ Qxd7 O-O Nf6. While the engine evaluation is slightly lower at +0.10, White scores a notable 51.4% here, as the simplification often leads to a stable, long-term positional edge.

Developmental Options and Sidelines

Other common continuations include Bc4, played in 16.9% of games, and Nc3, played in 7.5% of games. The move Bc4 targets the f7 square and often leads to the line Bc4 Nf6 Nc3 a6 d4 cxd4. Meanwhile, Nc3 prepares a Closed Sicilian or Grand Prix style setup, evaluated at +0.25. A rarer prophylactic choice is Be2, seen in 0.7% of games, which focuses on flexible development before committing the central pawns.