English Opening: King's English, Erbenheimer Gambit

In the English Opening: King's English, Erbenheimer Gambit, the move c4 by White is a hallmark of this opening. This move aims to control the center and prepare for a rapid deployment of the pieces. By advancing the pawn to c4, White invites Black to take control of the d5 square with e5. This can result in a symmetric pawn structure, which is a typical characteristic of the English Opening. However, the position can quickly change if White chooses to play the Erbenheimer Gambit with Ng5 and Ng4. This can result in a complex game with a lot of tactical possibilities.

Black plays e5 in response to 1. c4 as a way to fight for control of the center. This move aims to create a pawn structure similar to that of a Sicilian Defense in which Black has a pawn on d6 and e6, allowing for a solid pawn formation. By playing e5, Black aims to obstruct White's plans of placing a pawn on d5 and controlling the center. This move also provides an opportunity for Black's knights to gain space and maneuverability. However, Black must be careful not to expose their king's position by creating weaknesses on the f7 and d6 squares.

White plays Nc3 in response to Black's e5 as a way to develop a piece and prepare to control the center with d4. The knight on c3 supports the pawn on d4 and prepares for the possibility of attacking Black's pawn chain. By placing the knight on c3, White also prevents Black's knight from jumping to c5, which could challenge White's control of the d4 square. Moreover, the knight on c3 can later be used to support a pawn advance to b4, creating potential weaknesses of Black's queenside. In sum, White's move Nc3 is a versatile and flexible move that prepares for various attacking and strategical opportunities later in the game.

In the English Opening: King's English, Erbenheimer Gambit, Black plays Nf6 in response to White's Nc3 as a way to develop a piece and prepare for central control with d5. The knight's move to f6 also points towards the e4 square, creating potential threats against White's pawn chain. By placing the knight on f6, Black also prepares to complete their kingside development and potentially castle kingside. However, Black must be careful not to expose their king by disregarding their pawn structure. In sum, the move Nf6 is a flexible move that harmonizes Black's pieces and prepares for various attacking and defensive opportunities.

White plays Nf3 after Black develops their knight to f6, as a way to also develop their pieces and control the center. The knight on f3 supports the pawn on d4, which aims to restrict Black's pawn on e5 and control the center. With the knight on f3, White also prepares to castle kingside and complete their kingside development. Additionally, the knight on f3 can help to control the e5 square and support a potential pawn advance to e4, which could create attacking opportunities for White. In sum, the move Nf3 is a solid developing move that prepares for various strategic and tactical possibilities.

When White develops their knight to f3, Black often responds with e4 in the hope of gaining control of the center. This move is also in line with Black's overall idea to challenge White's pawn structures and create counterplay. The move e4 places pressure on White's knight and pawn on d4, which can potentially force pieces exchanges that would improve Black's pawn structure. It also opens a diagonal for Black's dark-squared bishop, which can become an active piece in the game. However, Black must be cautious as the move e4 often leads to an open center and can lead to tactical opportunities for both sides. Therefore, this move requires precise calculation and a solid understanding of the potential consequences of opening the position.

In the English Opening: King's English, Erbenheimer Gambit, after Black advances their pawn to e4, White often responds with the move Ng5. This move aims to attack the f7 pawn and create tactical opportunities for White. By placing the knight on g5, White also supports the pawn on e4, which restricts Black's pawn on d5 and can potentially force an exchange of pawns that would favor White. The move Ng5 also prepares for a follow-up move Ng4, which can pressure Black's knight on f6 and also threaten to win the d5 pawn. However, this move also comes with risks, as the knight on g5 can become isolated and vulnerable to Black's pieces. Therefore, White must be careful when playing this move and calculate potential consequences before committing to it.

When White places their knight on g5, Black often responds with Ng4 in an attempt to exchange pieces and attack White's knight. This move also aims to create a check against White's king, which can disrupt White's plans and force them to move their king or block it with a piece. The move Ng4 also prepares for a potential pawn advance to d5, which can attack White's pawn on e4 and create more central control for Black. However, Black must be careful not to expose their king's position after playing Ng4, as they may have weakened their pawn structure around the king. In sum, Ng4 is a tactical move that aims to challenge White's central control and create counterplay.