Catalan Opening: what should White play?

In this position of the Catalan Opening, White's most statistically dominant and theoretically sound continuation is Bg2, which has been played in 97.5% of recorded games (94K instances). This move develops the light-squared bishop to the long diagonal, maintaining a slight engine advantage of +0.26 while preparing for kingside castling.

The Main Line with Bg2

The move Bg2 is the defining characteristic of the Catalan system, placing the g2 on a powerful diagonal to exert pressure on the queenside. According to the database, the most common continuation is Bg2 d5 O-O dxc4 Qc2 a6, where White aims to recover the pawn on c4 while maintaining central control. This approach focuses on long-term positional pressure rather than immediate tactical confrontation.

Development via Nc3

While significantly less common, Nc3 represents the primary alternative, appearing in 1.8% of games (1.8K recorded). This move carries an engine evaluation of +0.18 and often leads to the line Nc3 d5 Bg2 dxc4 Ne5 Nc6. By developing the knight before the bishop, White creates different tactical tensions in the center, though it deviates from the most traditional Catalan structures.

Rare Alternatives and Engine Evaluations

Other options at this juncture are statistically rare. The move Qc2 has been played in only 50 games (0.1%) and carries an even evaluation of +0.00, typically leading to Qc2 c5 dxc5 Qa5+ Nc3 Qxc5. The move b3 is even more infrequent with only 32 recorded games, while Qb3 has no recorded games in this specific database and a slight negative evaluation of -0.03. These sidelines generally allow Black easier equalization compared to the main line pressure exerted by the fianchettoed bishop.