Alekhine Defense: Modern Variation, Alekhine Gambit

This aggressive chess opening challenges Black's kingside pawn structure and leads to highly tactical and complex middlegames.

The opening is characterized by an early pawn advance to e5 by White, which is met by Black's knight maneuver to d5. White then continues with c4, pushing the black knight to b6, and follows up with d4, establishing a strong pawn center. Black, in turn, aims to undermine this pawn center with moves like d6 and Bg4, pinning the white knight on f3. White's typical response is to develop the light-squared bishop to e2, breaking the pin and preparing to castle kingside.

This opening can lead to highly tactical and complex middlegames, with both sides vying for control of the center and attacking chances on the kingside. White's pawn center can be both a strength and a target, as Black will often look to chip away at it with pawn breaks and piece pressure. White, on the other hand, will try to maintain and expand their central presence, while also seeking opportunities to exploit weaknesses in Black's position.

The opening is a popular choice for players who enjoy sharp, double-edged positions and are not afraid to take risks in the opening. It has been employed by many top-level players, including its namesake, former World Champion Alexander Alekhine.