Marienbad System

In the Marienbad System, white starts with 1. d4, aiming to control the center of the board and develop the queen's pawn. This move prepares for a solid and positional game, as it limits the opponent's possible move choices. By occupying the center, white gains a better control of the board and an opportunity to attack black's weak spots. With this setup, white can launch an assault on either side of the board according to the opponent's response. By playing d4, white sets up some of the main concepts on which the rest of the game will revolve upon.

After 1. d4, Black plays Nf6 to also control the center of the board. The knight move puts pressure on white's d4 pawn while preparing to develop the knight to a better position. Moreover, knights usually occupy the center more flexibly than the bishops. Nf6 poses a direct threat to white's e4 square, from where white could launch an attack. Additionally, it allows black to castle kingside and connect the rooks, making them more useful in the game. By playing Nf6, black sets up their pieces harmoniously and prepares for a counter-attack.

After 1. d4 Nf6, White plays Nf3 to continue developing a knight and supporting the pawn on d4. Nf3 also allows for the development of the kingside pieces and castling kingside. By following this setup, White aims to control more space and keep the game solid. Nf3 also prepares for the possibility of controlling the center with e4 in the future. This move strengthens the pawn chain, helps protect the pawn on d4, and prepares for a flexible game. By playing Nf3, White prepares to launch an attack on Black's position once they have fully developed their pieces.

In the Marienbad System, after 1. d4 Nf6 2. Nf3, Black plays b6 to develop the dark-squared bishop and prepare to control the center with c5. Bb7 is the next move, eyeing the diagonal from a7-g1. With this move, Black also aims to limit the activity of white's light-squared bishop, which would have the potential to become active on the f4-square. Additionally, b6 discourages the pawn push c4, which undermines the d4-pawn. Furthermore, the move b6 prepares Black's position for a future kingside expansion, allowing the rook on a8 to connect with the king. By playing b6, Black's position benefits from more control and flexibility.

After 1. d4 Nf6 2. Nf3 b6, White plays g3 to control the light squares on the board and prepare to fianchetto the bishop to g2. With this move, White limits the activity of Black's dark square bishop and sets up a solid defense. The pawn on g3 also helps White control the f4-square and prevents Black's knight from jumping to that square. The bishop on g2 will play an important role by providing more control over the center, supporting the pawn on d4 and eyeing the long diagonal. Additionally, g3 prepares for a future kingside castle and contributes to a flexible plan. In sum, g3 is a strategic move that aims to secure White's position while setting up opportunities for an effective attack.

After 1. d4 Nf6 2. Nf3 b6 3. g3, Black plays Bb7 to develop the light-squared bishop and control the long diagonal. This move provides more flexibility to Black's pieces and prepares the bishop for a potential exchange on the diagonal. The bishop on b7 also adds pressure on the pawn chain by aiming at the weakened squares of d3 and c4. Furthermore, Bb7 prepares Black's position for a future kingside castle, aiming for a strong defensive setup. This move is an essential part of Black's strategy, as it solidifies the position and avoids potential pinning by White's bishop on g2. By playing Bb7, Black sets up a coordinated position and aims for more control over the board.

In the Marienbad System, after 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7, White plays Bg2 to complete the fianchettoed bishop setup. The bishop on g2 aims towards the center and targets Black's weakened squares, such as f6 and d6. With this move, White gains more control over the important d4-square, and the bishop complement the knight on f3, creating a strong defense. The bishop on g2 also contributes to a future kingside attack as it can put pressure on the h7-square and attack Black's king-side pawns. Additionally, Bg2 prepares for a potential exchange with Black's bishop on b7. By playing Bg2, White consolidates their position, prepares to develop other pieces, and sets up for attacking or defensive plans.

After 1. d4 Nf6 2. Nf3 b6 3. g3 Bb7 4. Bg2, Black plays c5 to contest the center of the board and gain more space. This move aims to challenge the control of White's pawn on d4 and opens up a diagonal for the light-squared bishop. Additionally, c5 prepares for the development of Black's queen's knight to c6, supporting the pawn on d4 and preparing to attack White's position. The pawn push also impedes the activity of White's c-pawn. Moreover, c5 helps to restrict the movement of White's bishop on g2 and prepares for possible piece exchanges in the center. By playing c5, Black's position becomes more dynamic, and their pieces become better coordinated.