Nimzo-Indian Defense: Normal Variation, Gligoric System, Keres Variation

The move 1. d4 is a typical opening move for a player who controls the center. By occupying the d4 square, White aims to limit Black's options and gain more space on the board. This move also prepares the way for the development of the c1 bishop, which can now be played to the most active square, d3.

The move 1...Nf6 is a common response to 1. d4. Black develops a knight and targets the center. This move allows Black to establish control over the e4 square, and possibly support the move e5 later on. Additionally, the knight on f6 defends the king and prepares for the castling move. With 1...Nf6, Black takes the first step towards a solid and flexible opening position.

The move c4 is a crucial move in many opening variations for White. By playing c4, White hopes to control more space in the center, and create a strong pawn structure. This move also paves the way for the development of the queen's bishop and knight. Additionally, the pawn on c4 gives White more options and flexibility in the early-middle game, allowing for various pawn breaks and attacks. In sum, c4 is a solid move that sets the stage for a powerful and dynamic game.

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With the move Nc3, White develops a key piece and prepares to control more space in the center. This move also supports the d4 pawn and reinforces White's control over the e5 square. Additionally, the knight on c3 prepares to attack the d5 square and blockades any possible advance of Black's pawn on c6. By playing Nc3, White also keeps the option open to transition into various set-ups and pawn structures, making this move a flexible choice for the opening.

The move Bb4 pins White's knight on c3 and puts pressure on White's pawn on d4. This move also helps Black develop a bishop to an active square and increases the control over the central squares. By playing Bb4, Black also prepares to trade the knight on c3, which may weaken White's pawn structure or create a target for future attacks. In sum, Bb4 is a principled move that introduces new strategic elements into the game, while maintaining a solid position.

In the Nimzo-Indian Defense, Normal Variation, Gligoric System, Keres Variation, the move e3 is a common response to Bb4. By playing e3, White prepares to establish better control over the d4 pawn, protecting it from potential attacks by Black's Bishop on b4. This move also prepares the way for the king's bishop to be developed to the d3 square, where it will help defend White's kingside and maybe put pressure on Black's weakened queenside. Additionally, e3 prevents Black from playing Ng4, which would put more pressure on White's position. All in all, e3 is a useful and flexible move that sets up the foundation for a solid opening game.

The move O-O is a common move in many openings that aims to improve the safety of the king. By castling kingside, Black connects the rooks and puts the king in a more secure position. This move also prepares for the deployment of the f8 bishop, which can be moved to the g7 square, adding more support to the king’s defense, and potentially creating an attack on White’s position. Additionally, by castling, Black avoids any potential tactical threats from White, such as Ng5 and h4-h5, which could threaten Black’s pawn structure. In sum, O-O is an essential move that strengthens Black’s position and helps prepare for the mid-game.

The move Bd3 is a logical development move for White that places the bishop on an active square and prepares to castle kingside. By developing the bishop, White connects the rooks and adds more support to the d4 pawn while directly looking at Black's king's position. This move also helps control the e4 square and puts pressure on Black's pawn on d5, potentially weakening Black's central pawns. Additionally, the bishop on d3 can later support a push of the f-pawn, leading to a kingside attack. In sum, Bd3 is a flexible move that prepares White's pieces for future developments and puts some pressure on Black's position.

In the Nimzo-Indian Defense, Normal Variation, Gligoric System, Keres Variation, the move d5 is a typical response to Bd3. This move puts pressure on White's central pawn and aims to gain more space in the center. By pushing the pawn to d5, Black frees the dark-squared bishop, which can be deployed to the e6-square, and also opens lines for the queen’s bishop and queen. This move also helps reduce the mobility of White's knight on c3, which becomes less active as d4 becomes more vulnerable. In sum, d5 is a solid move that aims to increase Black's control of the center and options for development.

The move Nf3 is a standard response for White in many openings and is typical in the Nimzo-Indian Defense. By playing Nf3, White develops a knight to an active square and defends the pawn on d4. This move also prepares the way for the white-squared bishop to be developed to f4 or g5, potentially pinning Black's knight. Additionally, with Nf3, White maintains control of the e5 square, preventing any potential move from Black's knight to that square. This move also puts pressure on Black's pawn on d5 and can lead to various pawn exchanges, which can create weak squares that White can potentially exploit. In sum, Nf3 is a flexible move that prepares White's position for further developments while keeping Black's options in check.

The move c5 is a common response to Nf3 in many openings and is suitable for the Nimzo-Indian Defense. By playing c5, Black gains even more space and control in the center. This move also prepares to exchanges pawns on d4 and opens up the queen’s bishop diagonal to put more pressure on White's position. Additionally, this move may tempt White to push the d4 pawn to d5, which could create more weak squares in White's pawn structure. By playing c5, Black also prepares for a potential queenside expansion or attack, gaining more space for the pieces. In sum, c5 is a dynamic move that keeps the position fluid and allows for more options in the future game.

In the Nimzo-Indian Defense, Normal Variation, Gligoric System, Keres Variation, the move O-O is a natural development move for White. Castling kingside puts the king in a safer position, connects the rooks, and prepares to defend the center. This move also allows the rook on h1 to potentially enter the game by using the g1 square. Additionally, by castling, White creates a wall of pawns that can help protect the king-side from potential attacks. Furthermore, this move may discourage any tactical threats from Black, such as a timely Ng4. In sum, O-O is a useful move that solidifies White's position, prepares for future developments, and can lead to a more aggressive play in the future.

The move b6 is often a standard part of Black's strategy in many openings and is an option in the Nimzo-Indian Defense. By playing b6, Black develops the bishop on b7 and puts pressure on the d5 pawn, which is often a target in these positions. This move also prepares to create a pawn chain on the queenside and control the b5 square, potentially limiting White's options. Additionally, given the position of Black's pawns and pieces, the move b6 can also provide a potential escape route for the bishop on b4. In sum, b6 is a flexible move that allows for further developments and keeps White guessing about Black's final intentions.