Modern Defense: Lizard Defense, Mittenberger Gambit

A sharp and aggressive chess opening that aims to counter the opponent's central pawn structure while offering a pawn sacrifice for rapid development and counterplay.

The opening is a variation of the Modern Defense, which focuses on countering the opponent's central pawn structure. In this particular variation, Black aims to challenge White's pawn on e4 by playing d5, offering a pawn sacrifice in exchange for rapid development and counterplay.

The opening is characterized by an early fianchetto of Black's dark-squared bishop on g7, which exerts pressure on the long diagonal and supports the pawn break with d5. White typically responds by developing their knight to c3 and capturing the pawn on d5, accepting the gambit.

Black's main idea is to exploit the open lines and diagonals created by the pawn sacrifice, while also aiming to undermine White's pawn center. This can lead to sharp and double-edged positions, where both sides have chances for an advantage.

This variation is not as popular or well-studied as other lines in the Modern Defense, but it can be a surprise weapon for Black players who are well-prepared and enjoy playing aggressive, unbalanced positions. It is important for both sides to be familiar with the typical plans and tactics that can arise from this opening, as mistakes can be heavily punished.

Overall, this opening is an interesting and aggressive choice for Black players who are looking for a fighting game against 1.e4 and are willing to take some risks in the opening.