Scandinavian Defense: Anderssen Counterattack, Collijn Variation

This aggressive chess opening features early central pawn exchanges and rapid piece development for counterplay.

The opening is a variation of the Scandinavian Defense, which arises after the initial moves. In this specific variation, Black aims to create counterplay by developing their pieces quickly and striking at the center with a pawn move. This opening is named after a Swedish chess player, who was a strong advocate of this line.

In this variation, Black sacrifices a pawn early in the game to open up lines for their pieces and create attacking chances. The key move for Black is pinning the White knight and preparing to push the pawn forward. White usually responds by challenging Black's center and opening up the position.

Black's main idea is to create counterplay and imbalance in the position, making it difficult for White to consolidate their extra pawn. The opening can lead to sharp tactical battles, where both sides need to be precise in their calculations and resourceful in their play.

While this opening is not as popular as other lines in the Scandinavian Defense, it has been employed by strong players, including a former World Champion. This variation can be a surprise weapon for Black, catching unprepared opponents off guard and leading to exciting, dynamic games.