Scandinavian Defense: Portuguese Gambit, Banker Variation

The move 1.e4 is a common opening move for White because it controls the center of the board and allows for the development of the king's knight. By opening with e4, White also puts pressure on Black's position, forcing them to respond and potentially giving White an advantage in the early stages of the game. This move sets the tone for the game and can dictate the types of positions that arise later.

The move d5 by Black is a direct counter-attack on White's pawn on e4, challenging White's control of the center of the board. It also allows Black's queen's pawn to be developed while putting pressure on White's e4 pawn. By playing d5, Black aims to create an equal or greater presence in the center of the board while also opening lines for their minor pieces to be developed. This move is a common response to White's e4 and can lead to several variations, including the Scandinavian Defense: Portuguese Gambit, Banker Variation.

White's move exd5 captures Black's pawn and opens up a diagonal for White's queen to enter the game. By capturing the pawn on d5, White also gains control over the center of the board, which is a key goal in the opening stages of the game. This move can also force Black to use their knight to recapture the pawn, which may not be the most desirable development for their pieces. In sum, the move exd5 is a common response to Black's d5 and can potentially give White a small advantage in the opening.

In the Scandinavian Defense: Portuguese Gambit, Banker Variation, the move Nf6 by Black develops a knight and attacks White's pawn on d5. By developing the knight, Black aims to gain control of the center of the board while also creating pressure on White's position. Additionally, Nf6 prepares for the future development of Black's king's bishop. This move is a common response to White's exd5 in the Scandinavian Defense and can lead to several variations in the opening.

White's move d4 following Black's Nf6 move in the Scandinavian Defense is to gain complete control of the center with pawns. It also defends the pawn on e4 and opens lines for White's pieces, such as the queen and bishops. This move also puts pressure on Black's knight, which may be forced to retreat or be exchanged for White's central pawn. By playing d4, White can solidify their position and gain an advantage in the opening stage of the game.

Black's move Bg4 after White's move d4 in the Scandinavian Defense develops a bishop, pins the knight on f3, and puts pressure on White's position. The bishop on g4 attacks White's knight, forcing it to move and potentially weakening White's pawn structure. Additionally, Bg4 prepares for the future development of Black's queen's knight while also defending Black's d5 pawn indirectly. This move is a common idea in the opening and can lead to several variations, including the Scandinavian Defense: Portuguese Gambit, Banker Variation.

In the Scandinavian Defense: Portuguese Gambit, Banker Variation, White's move f3 after Black's Bg4 move is to force Black's bishop to retreat, which removes the pin on White's knight. It also gains more control of the center of the board and prepares to develop White's pieces, including the king's bishop and queen. Additionally, f3 creates a potential weakness in White's pawn structure, but it can also lead to an attack on Black's position if White's pieces are developed efficiently. In sum, f3 is a useful move in the opening that can have both advantages and disadvantages for both sides.

In the Scandinavian Defense: Portuguese Gambit, Banker Variation, Black's move Bf5 after White's move f3 develops a bishop, attacks White's knight, and gains control over the center of the board. By developing the bishop to f5, Black puts pressure on White's knight and forces it to make a decision that may be unfavorable to White's position. Additionally, Bf5 prepares for the future development of Black's queen, while also connecting Black's rooks and potentially allowing for a more coordinated attack. This move is a common idea in the opening and can lead to several variations.

White's move c4 in response to Black's Bf5 move in the Scandinavian Defense aims to control the center of the board, and create a strong pawn chain. The pawn on c4 is defended by White's pawn on d4, thus securing White's central pawn structure. This move also prepares the development of White's queen's bishop and creates the opportunity for White's queen to be developed later in the game. Additionally, c4 may put pressure on Black's position and potentially gain White a small advantage in the opening.