Italian Game: Two Knights Defense: what should White play?

In the Italian Game: Two Knights Defense, White faces a critical choice at the square a3 variation. The engine-preferred continuation is d3, which maintains a slight evaluation advantage of +0.01 and is the most popular choice, appearing in 47.3% of the 523,344 recorded games. This move solidifies the center and prepares for a slow, maneuvering struggle characteristic of the Giuoco Piano structures.

The Strategic Role of d3

The move d3 is the primary theoretical recommendation, chosen in 287,000 games to stabilize the pawn on e4 and open the diagonal for the c1. By opting for the main line d3 d6 Nc3 a6 O-O h6, White avoids immediate tactical complications and focuses on long-term development. This approach keeps the evaluation nearly equal at +0.01, reflecting a balanced position where White retains a slight first-move initiative.

Development via Nc3

The second most frequent response is Nc3, played in 21.8% of recorded games (132,000 instances). This move carries an engine evaluation of +0.03 and leads to the line Nc3 d6 d3 a5 O-O O-O. By developing the b1 to its most natural square, White prepares to control the center while remaining flexible regarding the eventual placement of the central pawns.

Aggressive and Alternative Options

White occasionally employs the Evans-style expansion b4, which occurs in 11.8% of games (72,000 recorded). While the engine evaluates this at -0.25, it forces Black to respond to the threat against the c5, often leading to the sequence b4 Bb6 d3 a5 b5 Nd4. Less common alternatives include O-O, played in 5.0% of games, and the rare Qe2, which appears in only 0.5% of the database. These moves generally offer Black a slight edge in evaluation compared to the solid d3 or Nc3 lines.