Bird Opening: Dutch Variation: what to play after d5?

In the Bird Opening: Dutch Variation, White's most precise and statistically sound options are b3 and e3, both evaluated by the engine at -0.22. While e3 represents the overwhelming practical choice, played in 70.4% of games (2.19M recorded) with a 55.5% White score, the immediate queenside fianchetto with b3 claims the engine's top rank, appearing in 5.9% of games (185K recorded) and scoring 54.3% for White.

The Strategy Behind b3 and e3

Both primary moves focus on coordinating White's minor pieces around central outposts, particularly e5. An immediate b3 prepares the bishop deployment to b2 without prematurely committing the e2 pawn. In contrast, e3 blunts Black's dark-squared bishop along the diagonal toward h2 while securing central space. Both approaches tend to transpose smoothly; for example, the primary continuation for b3 leads to b3 Be7 Bb2 Nf6 e3 O-O, reaching identical piece configurations to the e3 Be7 b3 Nf6 Bb2 O-O sequence.

Kingside Fianchetto and Central Setups

White can also steer the game toward a double fianchetto with g3, which is chosen in 14.1% of games (441K recorded) with an engine evaluation of -0.25 and a 55.2% White score. An illustrative line after g3 continues with g3 Be7 d3 Nf6 a4 c5. A related setup features d3, seen in 7.9% of games (247K recorded) with an evaluation of -0.24, which often flows into similar pawn structures as seen in d3 Nf6 g3 Be7 a4 c5.

Developing the Queenside Knight

The least common option among the engine's top choices is Nc3, played in just 1.6% of games (51K recorded). It scores lower than the alternatives at 48.9%, carrying an evaluation of -0.29. The engine illustrates development via Nc3 Nf6 g3 d4 Nb1 b6, showing that placing the knight in front of the c-pawn allows Black to claim central space early.