Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation

The opening move 1. d4 by white is a common way to control the center of the board and gain space. It also frees the queen's bishop to develop towards a more active square. This move sets up a strong pawn structure and can be followed up with a number of different openings. The d4 pawn can also put pressure on black's knight on f6. This move is essential in the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation as it allows white to control the center and attack black's pieces.

The move Nf6 by Black is an attempt to challenge white's control over the center of the board. By developing a knight towards the center, Black aims to put pressure on the white pawn on d4. Additionally, the knight on f6 may also have the possibility of attacking the bishop on c4. Playing Nf6 also prepares for a future pawn push to d5, which can help Black gain space and counterattack. The move Nf6 is a common response to 1. d4 and is an essential part of the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation.

White's move c4 is a standard response to Black's Nf6. This move aims to control the center of the board and gain more space. By advancing the c-pawn, White also frees up their queen's bishop, allowing it to be developed towards a more active square. Playing c4 can help White to challenge Black's control over the center and set up a flexible pawn structure. Additionally, this move can prepare for a future pawn push to d5, which can help to open up lines for White's pieces. In sum, c4 is a key move in the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation and is an important element in many other openings as well.

In the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation, Black's move e6 is a natural response to White's c4. This move prepares to develop the dark-squared bishop to a more active position, usually to b7 or d7. It also controls the square d5, which can prevent White's knights from jumping to that square. By developing the bishop to b4, Black creates additional pressure on White's pawn on c3, disrupting their pawn structure and potentially creating weaknesses. The move e6 also supports a future pawn push to d5, which can help Black to gain more space and counterattack. In sum, e6 is an essential move in this opening system as it helps Black to develop their pieces and control the center of the board.

White's move Nf3 is a logical development move, aiming to control the central squares and support the d4 pawn. This knight can also prepare to jump to the central square d5, putting pressure on Black's position. Additionally, Nf3 helps to protect the pawn on c4, which can be targeted by Black's light-squared bishop. The knight on f3 can also support a future attack on Black's position, as it can potentially jump to g5 or h4. In sum, playing Nf3 is a common move in many chess openings and is a key component of the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation.

Black's move b6 is a common idea in many openings, including the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation. The move b6 prepares to develop the dark-squared bishop to a more active position on the long diagonal, often to b7. By doing so, Black puts pressure on the pawn on c4, which can potentially be captured with the bishop, disrupting White's pawn structure. Additionally, b6 helps to control the square c5, which can be used as an outpost for Black's pieces. This move also prepares for a future pawn push to d5, which can help Black gain space and counterattack. In sum, b6 is a flexible move that helps Black to develop their pieces and prepare for different strategic plans.

In the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation, White's move Nc3 is a logical response to Black's b6. This knight supports the d4 pawn and prepares to jump to the square d5, putting pressure on Black's pieces. Additionally, Nc3 helps White to control the central squares and can potentially help to develop the light-squared bishop to a more active position on the c4-e2 diagonal. This move also sets up the possibility for the further development of White's pieces and the creation of new opportunities for attacking Black's position. In sum, Nc3 is a key move in this opening and helps to make White's position more dynamic.

Black's move Bb4 in response to 4. Nc3 aims to increase the pressure on White's pawn on c4. By pinning the knight, Black creates a potential threat of capturing the pawn with their bishop. Additionally, the bishop on b4 helps to control the square d2, potentially preventing White's knight from jumping to that square. This move also develops the bishop to a more active position and prepares for future moves such as castling and a pawn push to d5. In sum, playing Bb4 is an important move in the Nimzo-Indian Defense and is especially effective in the Three Knights Variation, Duchamp Variation.