Chess Openings Lab
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Hungarian Opening

The Hungarian Opening starts with 1.g3, preparing Bg2 to control the long light diagonal before choosing a central plan. White can transpose to English, Catalan or King's Indian Attack structures, while Black usually takes the center with ...d5, ...e5 or ...Nf6 and develops freely.

Moves
1.g3
ECO
A00
Engine
+0.26 · level (Stockfish 17.1, depth 20)
Played
43,706 games in our lichess sample
White scores
51.3%

Key ideas for both sides

White

  • Fianchetto with Bg2 so the bishop hits d5, e4 and b7 along the long diagonal.
  • Against ...d5, combine Nf3, d4 and c4 for a Catalan structure, as in the engine line.
  • Against ...e5, play c4 for a reversed Sicilian or English setup with an extra tempo.
  • Keep the center flexible with d3 and e4 if you prefer a King's Indian Attack.

Black

  • Take the center with ...d5 and support it with ...c6 or ...e6 to blunt the g2 bishop.
  • Play ...e5 to grab space, then ...c6 and ...d5 for a big classical center.
  • Mirror with ...g6 and a bishop on g7 if you want a slow symmetrical game.
  • Use ...c5 and ...Nc6 to fight for d4 in Sicilian Invitation structures.

Plans and pawn structure

White's plans depend on Black's center. Against ...d5, the bishop on g2 presses on d5, and Nf3, d4 and c4 form a Catalan structure. Against ...e5, c4 and Bg2 aim at d5, as in the engine line 1...Nf6 2.c4 e5 3.Bg2 c6 4.Nf3 e4 5.Nd4. Black's simplest plan is a firm center supported by ...c6 or ...e6, then normal development. The game usually stays balanced and maneuvering.

What the Hungarian Opening is about

1.g3 prepares Bg2, where the bishop controls the long diagonal from h1 to a8. White does not commit a center pawn yet. Depending on Black's reply, the game can turn into an English with c4, a Catalan with d4 and c4, or a King's Indian Attack with d3 and e4.

Across 43706 games from the starting position White scored 51.3%. The engine's top replies, 1...Nf6, 1...d5 and 1...e5, all leave White only slightly better. The opening is sound and flexible, but it gives Black a free hand in the center.

The main variations

The Slav Formation, 1...d5 2.Bg2 c6, is the most played line. Black supports d5 with a pawn so the g2 bishop meets a solid wall. The engine line 3.Nf3 g6 4.d4 Bg7 5.a4 shows White grabbing queenside space while Black sets up a Slav center with a kingside fianchetto. The c8 bishop often goes to f5 or g4 before Black castles.

The Catalan Formation, 1...d5 2.Bg2 e6, supports d5 with the e-pawn. The engine line 3.d4 c5 4.Nf3 cxd4 5.Nxd4 opens the center early. White scored 53.2% here, the best result among the main lines.

The Indian Defense, 1...Nf6, keeps Black flexible. The engine likes 2.c4 e5 3.Bg2 c6, a reversed Sicilian structure where Black builds a center with ...d5.

The Symmetrical Variation, 1...g6, copies White's fianchetto. Play is slow, and White often takes the center with d4 and c4.

The Sicilian Invitation, 1...c5, fights for d4. White usually answers with c4 and Nc3 for a symmetrical English.

The Reversed Modern Defense, 2...c5, takes more space with ...d5 and ...c5, and White strikes back with d4 or Nf3 and c4.

Typical plans for White

White builds the fianchetto first, then chooses a center based on Black's setup. The bishop on g2 is White's key piece, so keep its diagonal open.

  • Catalan structure: against ...d5 and ...e6, play Nf3, d4 and c4, putting pressure on d5 and b7.
  • English structure: against ...e5, play c4 and Nc3 and use the extra tempo for queenside play.
  • King's Indian Attack: with d3, Nf3, O-O and e4, aim for a kingside attack later.
  • Queenside space: a4 and a5, as in the Slav Formation engine line, can cramp Black's queenside.

Typical plans for Black

Black's simplest plan is a firm center that blunts the g2 bishop. ...d5 with ...c6 or ...e6 does this well. With ...e5, Black takes more space and can add ...c6 and ...d5 for a big classical center.

  • Develop the c8 bishop before closing it in with ...e6, often to f5 or g4.
  • Against c4, support d5 or exchange on c4 when it gains time.
  • In the symmetrical lines, choose a break, ...c5 or ...e5, so the game does not stay passive.

Mistakes club players make

  • White playing with no central plan. Bg2 alone does not create pressure; decide between d4, c4 or e4.
  • Black leaving b7 or d5 loose. The g2 bishop punishes undefended pawns on the long diagonal.
  • Overpressing in the Reversed Alekhine. After 1...e5 2.Nf3, the push ...e4 chases the knight, but the engine sees equal play, so do not expect more.
  • Black copying White forever. Symmetrical play often hands White the first useful break.

Who should play it

1.g3 suits White players who like fianchetto structures and know the English, Catalan or King's Indian Attack well. It allows White to wait and choose the center after seeing Black's setup.

For Black, it is not dangerous. A center with ...d5 and ...c6 or ...e6 gives an easy game. The main risk is drifting into a passive position by copying White without a plan.

Because so many games transpose, both sides gain the most by studying structures rather than move orders. Know where your pieces belong in the Catalan, the reversed Sicilian and the King's Indian Attack, and you will recognize the plans no matter how the game started. White should also remember that the bishop on g2 is a defender of the king; trading it cheaply leaves the light squares around g2 and h3 weak.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position +0.26: level. Its three top choices for Black:

  1. +0.26 1...Nf6 2.c4 e5 3.Bg2 c6 4.Nf3
  2. +0.27 1...d5 2.Nf3 g6 3.d4 Bg7 4.Bg2
  3. +0.27 1...e5 2.c4 c6 3.d4 exd4 4.Qxd4

Pawns, from White's side.

How it scores on lichess

43,706 rated lichess games reached this position; White scored 51.3%.

under 120051.1%
1200–159951.3%
1600–199951.3%
2000 and up51.4%

Light: White wins. Grey: draws. Dark: Black wins. About the sample.

Variations of the Hungarian Opening (1.g3)

How to play against it

As Black, take the center with ...d5 or ...e5 and support it so the g2 bishop has nothing to bite on. The Slav Formation, ...d5 with ...c6, is a solid choice. Don't drift into passive symmetry; if you mirror with ...g6, have a plan for ...c5 or ...e5.

Questions

What are the moves of the Hungarian Opening (1.g3)?

The Hungarian Opening starts 1.g3. Its ECO code is A00.

Is the Hungarian Opening (1.g3) good for White?

Stockfish 17.1 rates the position +0.26 at depth 20, which is level. In 43,706 lichess games from our sample, White scored 51.3%. A flexible, low-risk choice for players who like fianchetto structures and transpositions, though it gives Black easy equality.

What is the main idea of the Hungarian Opening (1.g3)?

White fianchettoes the king's bishop first and waits for Black to commit to a center. The opening often transposes into English, Catalan or King's Indian Attack structures, so it suits players who know those well.

What should Black play next?

The engine's first choice is Nf6, with d5 and e5 close behind. 1...Nf6 develops and waits, keeping ...d5, ...e5 and ...g6 all available against White's next move.

Updated October 2026. Sources and method.