Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation, Modern Line

The move d4 by white is a common opening move in chess, called the Queen's Pawn Opening. It allows white to control the center and prepares for the development of the knight to c3, which supports the pawn on d4. This move also opens up the bishop on c1 to be developed, and potentially attacks the black knight on f6. In sum, d4 is a strong move that sets up the foundation for white's game plan.

Black's move Nf6 is a natural response to d4 as it challenges white's control over the center. By developing the knight, black seeks to control the dark squares and prepare for the possibility of e5. The knight on f6 also puts pressure on the pawn on d4, creating a potential threat of a pawn capture. Additionally, this move allows black to prepare for future piece development, such as the bishop on c8 or the pawn on b7.

White's move c4 is known as the Queen's Gambit, offering a pawn to gain more control over the center. The pawn on c4 supports the pawn on d4 and prepares for the development of the knight to c3. By playing c4, white also hopes to restrict black's pawn on d5 and prevent a future pawn break in the center. This move also opens up lines for the light-squared bishop on c1 to be developed. In sum, c4 is a strong move that sets up a solid position for white.

In the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation, Modern Line, Black's move e6 is a common response to c4 which prepares to contest white's control over the center. This move supports the pawn on d5 and establishes a strong pawn chain in the center, while also creating a potential defense for the king. The move e6 also prepares for the bishop on c8 to be developed to either d6 or b4, depending on game circumstances. In some tactical situations, e6 can also open up lines for the bishop to activate in the future.

White's move Nf3 is a natural developing move, which supports the pawn on d4 and opens up lines for the light-squared bishop on c1. This move also prepares for future pieces to be developed, such as the knight on c3 or the bishop on f4. Additionally, Nf3 controls the center and puts pressure on black's position, making it more difficult for black to defend. This move is a common response in many openings, including this variation of the Nimzo-Indian Defense, and helps to set up a strong position for white.

Black's move b6 is a common move in the Nimzo-Indian Defense, Three Knights Variation, Duchamp Variation, Modern Line. This move prepares to fianchetto the bishop to b7, which helps black to control the center and put pressure on white's pawn structure. The pawn on b6 also creates potential threats on the queen-side, and can open lines for the bishop on b7 to attack white's pawn chain. In some tactical situations, b6 can also help to secure black's king position. In sum, this move is an important part of black's strategy in this opening.

In the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation, Modern Line, White's move Nc3 is a natural developing move that supports the pawn on d4 and prepares for future piece development. This move also puts pressure on black's pawn on d5 and prepares to contest black's control over the center. Additionally, Nc3 develops a new piece and adds more flexibility to white's position, which could potentially prepare for a future pawn push to e4. This move is also a common response in this variation of the Nimzo-Indian Defense and helps to set up a strong position for white.

Black's move Bb4 is a common response to Nc3, which attacks black's knight on d5 and contests black's control over the center. This move pins the knight on c3 against white's king, and could potentially lead to future tactical opportunities. Additionally, Bb4 develops a new piece and puts pressure on white's pawn structure. In some variations of the Nimzo-Indian Defense, Bb4 is a important part of black's strategy because it prevents white from playing pawn to e4, limiting white's options in the center. In sum, this move is an important part of black's response in this variation.

White's move Bg5 is a strategic move aimed at exchanging black's powerful bishop on b4 which controls the center. By exchanging this bishop, white can weaken black's pawn structure. Additionally, Bg5 pins the knight on f6 against black's king, creating the possibility of future tactical opportunities. This move also prepares for white to castle kingside and connects the rooks, improving white's position. Furthermore, Bg5 prevents black from playing the move e6-e5, which could further strengthen black's control over the center. In sum, this move is an important part of white's strategy in this variation of the Nimzo-Indian Defense.

In the Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation, Modern Line, Black's move Bb7 is a common response to Bg5, which attacks the knight on f6 and prepares for possible tactical opportunities. This move also completes black's development by fianchettoing the bishop to b7, which helps to control the center and puts pressure on the pawn structure on the queen-side. Additionally, Bb7 allows black to potentially trade the bishop for white's knight on c3, improving black's position. The bishop on b7 also controls the important diagonal h1-a8, which potentially opens up checkmate opportunities on the king-side. In sum, this move is an important part of black's strategy in this variation of the Nimzo-Indian Defense.

White's move Nd2 is a flexible move that prepares for the development of other pieces and allows for the possibility of future tactical opportunities. This move also supports the pawn on c4 and prepares for the pawn to be captured with the Knight if needed, in order to recapture with the pawn and strengthen the pawn chain. Additionally, this move helps to connect the rooks and improves white's control over the center. The knight on d2 can also support the knight on f3 and prepare for the development of the bishop on c1. In sum, this move is an important part of white's strategy in this variation of the Nimzo-Indian Defense.