King's Fianchetto Opening

The opening begins with 1.g3, meaning the pawn from g2 advances one square. Its immediate purpose is to clear g2 for the bishop on f1. When that bishop develops to g2 after the g-pawn moves, it is called a fianchetto: from g2 the bishop looks along a long diagonal toward the center and queenside, the half of the board where the queen begins.

White does not immediately occupy the center, especially d4, e4, d5, and e5. Black therefore has room to place pawns there, while White keeps many choices available: the g1-knight can develop to f3, the c-pawn can advance to pressure the center, and the d- and e-pawns can be placed later according to Black's setup. That flexibility lets the game move into other opening systems without the first move fixing White's entire pawn structure.

1.g3 prepares the bishop without fixing the center

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Startg3d5Bg2

1.g3 opens g2 for the bishop while leaving the c-, d-, and e-pawns unmoved.

The first move defines the opening

White chooses to prepare the king bishop before deciding how to occupy the center.

1. 1.g3 opens g2 for the bishop while leaving the c-, d-, and e-pawns unmoved.

The practical difference from the King's Indian Attack is the initial move order and commitment. In the King's Indian Attack, developing the g1-knight to f3 is normally an important part of the setup; here White starts directly with g3 and can decide later where that knight belongs. Some opening databases call 1.g3 the Hungarian Opening, so both labels may be encountered for the same first move.