Bronstein Variation

The Bronstein Variation is a branch of the Gubinsky-Melts Defense, the Scandinavian line with 3...Qd6. After 4. d4 Nf6 5. Nf3, Black spends a tempo on 5...a6. The queen on d6 controls central squares but is a natural target. The main tactical nuisance is a knight jump to b5, which hits the queen and eyes c7. The pawn move rules that out, along with a bishop check from b5, so the queen can stay centralized without being harassed. The cost is time: Black is still behind in development in a position where White already has the d4 pawn and free piece play along the open lines.

White has several setups. The most frequent is 6. Bc4, which develops toward f7, though in practice Black scores slightly better against it. White does better with 6. g3, which prepares a kingside fianchetto, and with 6. Be3, which supports d4 and can be followed by long castling. Engines regard the position as clearly better for White and rate quiet moves such as g3, a3 and h3 highly. In online games, however, results are close to even, with Black winning marginally more often.