Nimzo-Indian Defense: Hübner Variation, Main Line

The move d4 is the main reason behind starting with 1. d4. It aims to control the center and increase the mobility of the queen’s pawn. Black responds with Nf6, which attacks the center and prepares to develop the light-squared bishop. As White continues with c4, they look to reinforce the center while Black brings out their bishop to pin the knight on c3. The opening then proceeds with the strong move e6, that prepares for a solid pawn structure and allows for better control of e4.

After the move 1. d4 by White, Black responds with Nf6 to attack White’s central pawn and take control of the center. This move prepares the development of the dark-squared bishop, and puts pressure on White's central pawn and the c4 square. Nf6 is a common move in many openings and is used to control space and restrict the opponent's potential pawn advances. Black's idea behind Nf6 is to also threaten the possibility of capturing the pawn on d4 with the knight and creating an unbalanced position.

The move c4 by White is a strong attempt to control the center and put pressure on Black’s knight on f6. It is also known as the Queen's Pawn Opening, which can lead to a variety of different openings depending on Black's response. By advancing the pawn on c4, White aims to expand their control over the d5 square and prevent Black from occupying it with a pawn or knight. c4 is an important and common move in many opening systems, including the English and the Queen’s Gambit.

In the Nimzo-Indian Defense: Hübner Variation, Main Line, Black responds to the move c4 by playing e6. This move aims to block White's pawn on c4 and prevent the pawn from advancing further. By playing e6, Black looks to create a strong pawn structure in the center, with pawns on d6 and e6 protecting each other. Additionally, the move e6 prepares to activate the bishop on the long diagonal and puts pressure on White's pawn on d4. This move also limits the possibilities for White to create a pawn center with pawns on e4 and d4, which is typical in other openings.

After the moves 1. d4 Nf6 2. c4 e6, White develops their knight to c3. This move aims to control the d5 square and increase the pressure on Black's pawn on e6. The knight on c3 also prepares for a future pawn move to d4, which would give the knight the ability to control more central squares. Additionally, the move Nc3 supports White's pawn on c4 and allows the development of the bishop to d3 or e2 in the future. By playing Nc3, White looks to complete their development in the opening phase and gain control of the center.

After the moves 1. d4 Nf6 2. c4 e6 3. Nc3, Black decides to place their bishop on b4. This move pins White's knight on c3 and creates tactical pressure on the center, as White cannot respond with dxc3 without losing the central pawn. By playing Bb4, Black also prepares to exchange the knight on c3, which is a strong defender of the d4-pawn. This weakening of White's pawn structure can result in a slight initiative for Black. Moreover, the bishop on b4 puts pressure on White’s pawn on e3 and limits the development of the Light-Squared Bishop. With this move, Black develops their bishop to an active square and exerts early pressure on White's position.

In the Nimzo-Indian Defense: Hübner Variation, Main Line, White responds to the move Bb4 by playing e3. This move aims to provide a solid position for White's king and prevent any future pins of Black's bishop on the c1-h6 diagonal. By playing e3, White also prepares to develop the light-squared bishop to either d3 or e2, and reinforces the d4 pawn. The pawn on e3 also provides an additional defense for the knight on c3. The move e3 is an important step in many opening systems to solidify the pawn structure, control the center and prepare for further piece development.

After the moves 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3, Black chooses to challenge White's control of the center by advancing their pawn to c5. This move counterattacks White’s pawn chain and tries to reduce its power by targeting the pawn on d4. Additionally, c5 opens lines for Black's dark-squared bishop and queen, which could be useful in future tactics. By playing c5, Black also gains more space on the board, increases their control over the center, and prepares for a possible future attack on White’s pawn structure. This move is typical in many opening systems and can lead to dynamic and unbalanced positions.

After the moves 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5, White develops their bishop to d3. This move aims to control the long diagonal and pressure the pawn on f7, which is a potential weakness in Black’s position. By playing Bd3, White also prepares for castle kingside and ensures their pieces are coordinated. The bishop on d3 also supports the pawn on e3 and prepares for a possible future advancement on the kingside. The move Bd3 is a common development move in many openings, which aims to position pieces on active and useful squares.

In the Nimzo-Indian Defense: Hübner Variation, Main Line, Black responds to the move Bd3 by playing Nc6. This move aims to control the d4 square and add pressure to White's pawn chain. The knight on c6 also supports the pawn on d5, which creates a strong pawn structure in the center. Additionally, by moving the knight, Black frees the dark-squared bishop and prepares to castle kingside. The move Nc6 can be seen as a flexible move that allows Black to coordinate their pieces and develop their position. It is also typical in many opening systems to bring the knight to an active square in the center of the board.

After the moves 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6, White develops their knight to f3. This move allows the knight to guard the e4-square and pressure Black's pawn on d5. Nf3 is a strong move that supports the development of other pieces such as the kingside bishop and the queen. By playing Nf3, White also prepares for future castling kingside and solidifies their position. The knight on f3 also makes it difficult for Black to advance e5, blocking their pawn structure. Nf3 is often a standard move in many opening systems and is used to develop pieces rapidly and build a strong defense.

After the moves 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. Nf3, Black captures the knight on c3 with their bishop by playing Bxc3+. This move removes a strong defender of White's pawn on d4 and weakens White's pawn structure. By playing Bxc3+, Black also doubles White's pawns, which adds to the pressure on their pawn chain. This move also leaves the b4-square available for the Black queen or knight to use in the future, for example to support a pawn push to b4. Additionally, by capturing the knight on c3, Black gets closer to the completion of their development while creating a small advantage in the center. The move Bxc3+ can be seen as a tactical and strategic decision that aims to destabilize White's position and increase the chances of achieving a favorable outcome.

In the Nimzo-Indian Defense: Hübner Variation, Main Line, White responds to the capture of their knight on c3 with bxc3. This move rescues the pawn on d4 and removes the doubled pawns on the c-file. By playing bxc3, White avoids the creation of an isolated pawn on the c-file and reduces the negative impact of the doubled pawns. This move also opens the b-file, which can be used for future rook activity. Additionally, by capturing with the pawn, White prepares for possible pawn breaks on the queenside while strengthening their position in the center. The move bxc3 can be seen as a strategic decision that aims to improve White's pawn structure and gain more control over the board.

After the moves 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 Nc6 6. Nf3 Bxc3+ 7. bxc3, Black plays d6 to support their knight on c6, create a strong pawn structure, and limit White's potential pawn breaks. The pawn on d6 protects the knight and prepares to control the central squares. Additionally, d6 creates a barrier that makes it difficult for White to advance their pawns on the queenside. By playing d6, Black also prepares for the development of the light-squared bishop and castle kingside. This move can be seen as a solid defensive move that establishes a strong pawn chain and minimizes the possibility of weaknesses in their position.