Blackmar-Diemer Gambit Declined: Vienna Defense

In the Blackmar-Diemer Gambit Declined: Vienna Defense, white starts the game with the move d4. This move controls the center and opens the way for the bishop on c1 and the queen on d1. By playing d4, white also gains space on the board and prepares to develop the pieces rapidly. The move d4 also supports the pawn on e5 and prepares to castle the king. In sum, this move is essential in setting up a strong position for white in the opening phase of the game.

Black's move d5 is a classical response to white's move d4. This move immediately fights for control of the central squares and opens up lines for Black's own pieces to enter the game. By advancing the d-pawn, Black gains space and prepares to control the game from the center. Additionally, the move d5 creates a pawn structure that is flexible and allows Black the possibility to choose between different pawn formations depending on the course of the game. All in all, d5 is an effective move in the opening that sets the tone for the rest of the game.

In the position after 1. d4 d5, White's move e4 is known as the Queen Pawn Game. This move aims to further control the center and increase the pressure on Black's position. The pawn on e4 can also help to develop the bishop on c1 and potentially threaten Black's d5 pawn. Playing e4 also opens up the possibility of a pawn exchange that can lead to a more open position with more tactical opportunities. In sum, the move e4 is a strong attack on Black's center that can lead to an active and dynamic game.

In the Blackmar-Diemer Gambit Declined: Vienna Defense, Black's move dxe4 accepts the gambit pawn offered by White and gains a pawn in the center. By capturing the pawn on e4, Black gains control of the key central square and gains more space on the board. This move also opens the diagonal for Black's light-squared bishop and allows it to become an active piece. Although accepting the gambit pawn can lead to a more complicated game, it can also be a good practical option for players who want to challenge White's aggression while maintaining control of the center.

In the position after 1. d4 d5 2. e4 dxe4, White's move Nc3 develops the knight and attacks the pawn on e4. By placing the knight on c3, White prepares to add more pressure on Black's position and supports the pawn on d4. Furthermore, the knight on c3 can potentially attack Black's e4 pawn once again after the black knight on f6 moves. This move is an essential step in the opening for White and sets up for an aggressive continuation with the pawn push f3 and the development of the pieces on the kingside.

In the position after 1. d4 d5 2. e4 dxe4 3. Nc3, Black's move Nf6 develops a piece and defends the pawn on e4. By placing the knight on f6, Black prepares to make more moves towards the center and prepares to castle on the kingside. The knight on f6 can also become a good defender of the pawn on d5 if needed. Moreover, developing the knight on f6 allows Black to attack the pawn on e4 if the white knight on c3 moves. Nf6 is a natural move in the opening that aims to control the center and develop the pieces.

In the Blackmar-Diemer Gambit Declined: Vienna Defense, White's move f3 is a natural continuation to gain more control of the center and create more space for the pieces. By advancing the f-pawn, White gains more control of the e4 square and prepares to castle on the kingside. Additionally, f3 creates a possible threat to Black's bishop on c8 and forces it to make a decision on where to go. This move can also potentially prepare for an attack on the kingside and allows White to bring in more pieces into the game. In sum, f3 is an aggressive move in the opening that aims to exploit the open lines and uncastled position of Black's pieces.

In the position after 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3, Black's move Bf5 attacks the pawn on e4 and creates a pin on the knight on c3. This move also develops the bishop and prepares to castle on the kingside. By placing the bishop on f5, Black aims to control the diagonal and put some pressure on White's position. Moreover, Bf5 allows Black to keep the pawn on e4 under constant pressure and potentially force White to make some concessions. Although the bishop on f5 can be targeted by white pawns later in the game, Black's move is a reasonable development move in the opening that creates some imbalances and takes the initiative in the game.