Three Knights Variation, Hungarian Variation

The Hungarian Variation (ECO D93) arises when White meets the Grünfeld with 4. Nf3 and 5. Bf4, then follows 5...O-O with 6. e3. Instead of sharper treatments of the Hungarian Attack such as 6. Qb3, White reinforces d4 and keeps the dark-squared bishop outside the pawn chain, a modest scheme that resembles a queen's pawn setup more than a fight over a broad center. Because White has not played e4, Black is under no pressure to break up a big pawn front. The question is how to pressure White's c4-d4-e3 chain.

The most common answer by a wide margin is 6...c5, which attacks d4 immediately and suits the g7-bishop. It is also an engine choice, and Black scores well with it on Lichess. 6...c6 is the main solid alternative, reinforcing d5 in Slav style, and White does somewhat better against it. 6...dxc4 gives up the center to gain time against White's queenside. The engine rates the position as roughly balanced, and Black wins slightly more often than White in the Lichess games that reach it.