Sicilian Defense: what should White play?

In the Sicilian Defense (ECO B50), White typically continues with the recapture Nxd4, which is the standard approach to the Open Sicilian. This move is played in 88.8% of recorded games (58 million instances) and maintains a slight engine evaluation of +0.29. By occupying the d4 square with the d4, White secures central influence and prepares for rapid development of the queenside pieces.

The Main Line Continuation

The move Nxd4 is the most frequent choice because it establishes a powerful central presence. Following this recapture, the most common sequence is Nxd4 Nf6 Nc3 a6 Bg5 e6, leading into the Najdorf or Richter-Rauzer variations depending on Black's subsequent choices. While White scores exactly 50.0% from this position, the move is favored for its theoretical depth and the dynamic winning chances it offers both sides.

Strategic Alternatives

White may opt for the variation Qxd4, which occurs in 6.3% of games (4.14 million recorded). This line leads to a different pawn structure and often involves the sequence Qxd4 Nf6 Be2 g6 O-O Bg7. Statistically, this move yields a higher win rate for White at 52.1%, despite a lower engine evaluation of +0.12. Another option is the Alapin-style transition with c3, played in 3.4% of games, which carries the highest win percentage for White at 52.6% but a lower engine evaluation of -0.21.

Minor Variations and Development

Less common responses include Bc4 and the check Bb5+. The move Bc4 is seen in 0.9% of games and carries an engine evaluation of -0.02, typically leading to Bc4 Nf6 Qxd4 g6 Nc3 Bg7. The check Bb5+ is played in 0.3% of games (208,000 recorded) and results in a score of 49.2% for White. These sidelines often aim to take Black out of deeply studied theoretical paths while maintaining a relatively balanced position.