French Defense: Winawer Variation, Fingerslip Variation

The move 1.e4 is intended to gain control over the center of the board. By occupying the e4 square, White aims to restrict Black's pawn movement and create space for their pieces to develop. The move also prepares for the development of the king's bishop and queen's knight. With the pawn on e4, the bishop can be developed to c4 or d3, while the knight can move to f3 or d2. Additionally, 1.e4 opens up diagonal access for the queen and queen's bishop.

Black's move e6 aims to control the d5 square and challenge White's control of the center. By placing a pawn on e6, Black restricts White's pawn on d4 from advancing and gaining more space in the center. The move also prepares for the development of the king's bishop and queen's knight, which can be directed to the e7 and d7 squares respectively. Additionally, the pawn on e6 protects the pawn on d5, which is an important pawn for Black's defense.

White's move d4 aims to further control the center of the board and gain more space for their pieces to develop. By placing a pawn on d4, White restricts Black's pawn on e5 from advancing and places pressure on Black's pawn on d5. The move also prepares for the development of the queen and queen's bishop, which have more space to move to and can aim at the weakened f7 square in the future. Additionally, the pawn on d4 frees up the knight on f3 to be developed and increases White's control of the d5 square.

In the French Defense: Winawer Variation, Fingerslip Variation, Black's move d5 is a counter-attack against White's pawn on d4 and aims to gain more control of the center. By pushing the pawn to d5, Black challenges White's control of the central squares and opens up diagonal access for their bishop on c8 and queen. The move also frees up Black's light-squared bishop and allows for development to either e7 or d6. Additionally, the pawn on d5 forces White's knight on c3 to move to a less desirable square and can sometimes create opening lines for Black's pieces.

White's move Nc3 in response to Black's d5 aims to maintain control over the central squares and support the pawn on d4. The knight on c3 actively attacks the pawn on d5, forcing Black to deal with the threat and use resources to defend it. The move also prepares for the development of the king's bishop to either d3 or e2, and allows for the possibility of the knight being redeployed to d2 to support the pawn on c4. Additionally, the knight on c3 restricts Black's pawn on e5 from advancing and may also help White control the d5 square.

Black's move Bb4 aims to attack White's knight on c3, which is thought to be one of White's most important pieces in this set-up. The move also increases the pressure on White's control of the d4 square and restricts the development of White's king's bishop. The bishop on b4 also indirectly attacks White's pawn on e4 and potentially threatens White's king if Black can create an opening on the f-file. Additionally, Bb4 pins the knight on c3, which means it cannot move without conceding material or control of important squares. In sum, Bb4 can create tactical opportunities for Black and force White to make some difficult decisions.

In the French Defense: Winawer Variation, Fingerslip Variation, White's move Bd2 aims to deal with the pin on the knight on c3 and remove the pressure on the d4 square. By developing the bishop to d2, White prepares to castle kingside and potentially gain control of the e1-h4 diagonal. The move also protects the pawn on c3 and frees up the knight to move to d2 or f2 if necessary. Additionally, the bishop on d2 can support the pawn on e3 and potentially protect White's king in the future. However, the move can also be seen as a loss of tempo for White, as they are moving a piece twice in the opening and allowing Black to further develop their own pieces.