Zukertort Opening: Tennison Gambit: what to play after e5?

In this position arising from the Zukertort Opening: Tennison Gambit, Black's most effective continuation is Bg4, pinning the f3 and securing active piece development before committing the pawn structure. Black leads the engine evaluations with this move at +0.17, allowing Black to smoothly transition into a sound setup without trapping the light-squared bishop.

Bishop Development Options

The position is overwhelmingly defined by the development of Black's light-squared bishop outside the pawn chain. The primary choice, Bg4, appears in 49.0% of recorded games (5.36M recorded) and holds White to a 46.1% scoring rate. The alternative active square is Bf5, which accounts for 39.5% of games (4.33M recorded) with an evaluation of +0.47 and White scoring 48.6%. Both moves solve the central challenge for Black by activating the bishop prior to closing the diagonal with an eventual pawn push to e6.

The Main Line Continuations

When Black initiates Bg4, the primary engine continuation unfolds with Bg4 d4 e6 c3 Nd7 Be2. Black bolsters the center and readies kingside piece development while White establishes a central presence on d4. By contrast, after the secondary move Bf5, play proceeds along Bf5 d4 e6 Be2 Nd7 O-O, demonstrating a similar structure where White breaks the tension with simple piece mobilization and castling.

Alternative Central Approaches

Players looking to contest the center immediately sometimes select c5, which appears in 11.0% of encounters (1.21M recorded) and carries an evaluation of +0.40. The main engine line runs c5 d4 cxd4 Qxd4 Nc6 Qf4, prompting an early queen sortie from White while Black gains time developing the knight. Flank pawn moves such as a6 (0.3% of games, eval +0.40) and h6 (0.2% of games, eval +0.43) are rare sidelines that typically transpose back to the main bishop setups after White pushes d4.