English Opening: King's English Variation, Botvinnik System

In the English Opening: King's English Variation, Botvinnik System, the first move c4 is aimed at controlling the center of the board. White wants to establish a pawn presence in the center and restrict Black's pawn movements. The move is also known to invite Black to mirror the opening with e5, creating a symmetrical pawn structure. Additionally, it prepares for the development of White's knights and bishop.

Black plays e5 in response to c4 to also gain control of the center and challenge White's pawn presence. By pushing the pawn to e5, Black aims to open lines for the dark-squared bishop and queen. The move also puts pressure on White's pawn on d4, which is no longer supported by a pawn on c4. Furthermore, it can potentially lead to a symmetrical pawn structure if White chooses to capture the pawn on e5.

White plays Nc3 after 1. c4 e5 to reinforce the pawn on d4, establish control over the center, and prepare for further development. The knight can also be used to attack Black's pawns on d6 and e5 if Black is not careful. Additionally, Nc3 is a flexible move that allows White to have various options for the next moves, including playing d3 to further support the pawn on d4 or playing g3 to set up a fianchetto of the light-squared bishop.

In the English Opening: King's English Variation, Botvinnik System, Black plays Nc6 after 1. c4 e5 2. Nc3 to develop a piece and to prepare for a possible pawn capture on d4 by White. The knight also puts pressure on White's pawn on e4, which needs constant protection to maintain its foothold in the center. Moreover, the move brings Black one step closer to castling, which is a crucial step for the safety of the king. Additionally, by developing the knight, Black can later consider occupying the d4 square with another knight or bishop.

White plays g3 after 1. c4 e5 2. Nc3 Nc6 to prepare for a fianchetto of the light-squared bishop. The move creates a safe haven for the king to castle and makes the bishop more active than when placed on c1. Furthermore, it reinforces the pawn chain in the center of the board and restricts Black's pawn movements on the kingside. The move also allows White to control the h4-d8 diagonal, which can be important in some variations. Additionally, by playing g3, White can avoid any pin on the knight on f3 by Black's bishop on g4.

Black plays g6 after 1. c4 e5 2. Nc3 Nc6 3. g3 to prepare for a fianchetto of the dark-squared bishop. The move creates a pawn chain in the center of the board and makes the bishop more active than when placed on the original square. Furthermore, it reinforces the pawn structure on the kingside and restricts any potential attack or pressure on the d6-pawn. In some variations, g6 allows Black's knight on f6 to move to g4, which can put pressure on White's pawn structure on the kingside and make it harder for White's pieces to develop efficiently. Additionally, after playing g6, Black can consider castling on the kingside to further secure the king's safety.

In the English Opening: King's English Variation, Botvinnik System, White plays Bg2 after 1. c4 e5 2. Nc3 Nc6 3. g3 g6 to complete the fianchetto of the light-squared bishop. The move strengthens the defense of the pawn structure on the kingside and puts pressure on Black's positions on the center and queenside. The bishop also controls the diagonal b1-h7, which can be very useful in many variations. Additionally, the move is a crucial step towards castling on the kingside, which is a key defensive position for the king. The bishop can also be useful in supporting potential attacks or pressure on Black's king.

Black plays Bg7 after 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 to complete the fianchetto of the dark-squared bishop. The move provides additional support to Black's pawn chain on the kingside and contests control over the diagonal a1-h8. Moreover, the bishop can play an active role in any potential counter-attacks or pressure on White's kingside. The move also prepares for kingside castling, which can help protect Black's king and activate the rooks. Lastly, Bg7 allows Black to potentially trade-off White's bishop on g2 and weaken White's pawn structure.

White plays d3 after 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 to further support the pawn on d4 and prepare for castling on the kingside. The move also allows White to free up the squares for the development of the dark-squared bishop and the queen, which can be central to a potential attack. The move also limits any potential attacks on the e4-pawn by Black's knights on c6 and e6. Additionally, d3 is a flexible move that allows White to have various options for the next moves, including playing f4 to further attack Black's king or playing e4 to control the center with pawns.

In the English Opening: King's English Variation, Botvinnik System, Black plays d6 after 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 to reinforce the pawn chain in the center and prepare for a possible occupation of the d4 square. The move also allows for additional support to the knight on c6 and prepares for the bishop to potentially move to e6 or f5 depending on the situation. Moreover, the pawn on d6 can also help control the dark squares on the board. Additionally, the move prepares for a potential attack or defense on the kingside depending on the position of the pieces.

White plays e4 after 1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 to control the center with pawns and gain space on the board. The move frees up the bishop on g2 to become more active and helps White prepare for a potential attack on Black's king. Moreover, e4 can potentially create weaknesses in Black's pawn structure around the d6- and f6-pawns. The move also helps White's knights on c3 and f3 to become more active. Additionally, by playing e4, White can aim to gain control over more squares and limit Black's mobility.