Vienna Gambit, with Max Lange Defense: Knight Variation: what should White play?

In the Vienna Gambit, with Max Lange Defense: Knight Variation, White's strongest continuation is to immediately regain the gambit pawn with Bxf4. This move solves the structural issue on the kingside, develops a minor piece, and establishes an engine evaluation of +1.08 across roughly 155K recorded games in this position. By capturing on f4, White maintains a dominant central presence while preparing queenside castling.

Regaining the Gambit Pawn with Bxf4

The primary choice for White is Bxf4, which eliminates Black's advanced f-pawn and develops the dark-squared bishop to an active post. Rather than fearing the pin on f3, White can calmly develop the queen and castle long. The engine's illustrative main line demonstrates this strategy via Bxf4 Nf6 Qd3 Be7 O-O-O O-O, leading to a harmonious setup where White's central space advantage provides a steady edge.

Alternatives: Bb5 and Developing Options

White also has secondary paths, the most prominent of which is Bb5, assessed at +0.82. This continuation pressures the c6 knight immediately, leading into lines like Bb5 a6 Bxc6+ bxc6 Bxf4 Ne7, where White damages Black's pawn structure prior to recovering the pawn on f4. More passive setups include Bc4 (+0.34) and Qd3 (+0.32), though both allow complications such as Bc4 Bxf3 Qxf3 Nxd4 Qf2 Ne6.

Central Complications

Another possibility seen in the database is Nd5, yielding an approximately equal evaluation (+0.01). This move provokes sharp tactical play, as shown in Nd5 Bxf3 gxf3 Qh4+ Ke2 O-O-O, which forces White's king to forfeit castling rights. Consequently, the straightforward Bxf4 remains the most reliable and effective option for White.