Catalan Opening

The Catalan Opening combines White pawns on d4 and c4 with g3 and Bg2. Developing the bishop this way is called a fianchetto: the g-pawn advances first and the bishop then goes to g2, where it looks along a long diagonal toward Black's queenside.

White is not necessarily trying to attack the king quickly. The practical point is often long-term pressure on the center and queenside, especially when the g2-bishop becomes active. Black develops and must decide how to handle the tension between the d5-pawn and White's c4-pawn.

That decision separates much of the opening's theory. In the Open Catalan, Black captures on c4 and temporarily takes a pawn. In the Closed Catalan, Black keeps the pawn on d5 and maintains a more compact structure. Both belong to the same opening family, but they create different strategic problems.

The fianchetto defines Catalan pressure

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Startg3d5Bg2

g3 begins the fianchetto while keeping a flexible structure around the king.

d4 and c4 leave the fianchetto ready

White already controls central space and prepares a long-range piece without resolving the structure yet.

1. g3 begins the fianchetto while keeping a flexible structure around the king.