Scandinavian Defense: Portuguese Gambit, Jadoul Variation

One of the most commonly played opening moves in chess is e4. This move frees the bishop and queen, and allows for the control of the center of the board. Control of the center is critical as it gives flexibility to the pieces, and can also lead to a quick attack against the opponent. In the Scandinavian Defense, the move e4 is still important but is countered with d5, attacking white's pawn. By taking the pawn with exd5, white now has an option to gambit with Nf6 or to play safe and retreat the knight.

Black plays d5 in response to e4 to gain control of the center. By pushing the pawn to d5, Black has created a pawn chain that controls the squares in the center of the board and puts pressure on white's pawn on e4. In addition, it frees up the bishop on c8 and the queen on d8 to get into the game quickly. D5 is a strong move that is commonly played in various openings in chess, including the Scandinavian Defense.

White plays exd5 after Black's d5 to capture the pawn and open up the center. By taking the pawn, White also gains control of the square on d5 and limits Black's mobility. This move can be risky as it leads to a gambit, giving up a pawn for a quick development. However, it can also result in a stronger position for White if Black doesn't respond correctly. Exd5 is a common move played in many openings, including the Scandinavian Defense.

In the Scandinavian Defense: Portuguese Gambit, Jadoul Variation, Black plays Nf6 after exd5 to attack white's pawn on e4 and gain tempo. This move also develops the knight, putting pressure on the center and supporting the pawn on d5. The knight's placement on f6 also blocks the bishop on c1 and limits white's ability to move their pawns forward. In sum, Nf6 is a strong move that is frequently played in the Scandinavian Defense.

After Black's Nf6, White plays d4 to reinforce the pawn on e4 and gain more control of the center. This move also frees up the queen on d1 and bishop on c1, allowing for more flexibility in the game. By playing d4, White is protecting their pawn and putting pressure on Black's knight, forcing them to either retreat or exchange. This move is commonly played in many openings, including the Scandinavian Defense, to control the center of the board and develop pieces.

After White's d4, Black plays Bg4 to pin the knight on f3 and disrupt White's pawn structure. This move also develops the bishop on g4 and applies pressure to White's center. By pinning the knight, Black can threaten to capture with their pawn on d5, breaking apart White's pawn structure and gaining more control of the center. In sum, Bg4 is a strong move that is frequently played in many openings, including the Scandinavian Defense.

In the Scandinavian Defense: Portuguese Gambit, Jadoul Variation, White plays f3 after Black's Bg4 to kick the bishop back and prevent it from being able to pin the knight. By playing f3, White reinforces their pawn on e4, preventing Black's bishop on g4 from attacking it. This move also prepares for the castle on the kingside and gains more control of the center. However, f3 also has potential downsides, as it weakens White's pawn structure and creates a weakness on the kingside. In sum, f3 is a tactical move that must be played carefully to avoid exposing the king.

After White's f3, Black plays Bf5 to develop the bishop and attack the knight on c3. By moving the bishop to f5, Black puts pressure on White's pawn structure and blocks the diagonal for the bishop on c1. This move also prepares for the castle on the kingside and supports the pawn on d5. Moreover, White's knight on c3 is vulnerable to attack from Black's bishop, and it can potentially force the knight to retreat to a passive position. In sum, Bf5 is a useful move that develops the pieces and puts pressure on White's position.

After Black's Bf5, White plays Bb5+ to attack the knight on f6 and force it to move, potentially weakening Black's pawn structure. By playing Bb5+, White also pins the bishop on f5 and threatens to capture it with the knight on c3. This move can also be useful in disturbing Black's development, as it forces them to either move their king or block the check with their queen. Additionally, Bb5+ can also prepare for the castle on the kingside, improving the positioning of the king and rook. In sum, Bb5+ is a tactical move that disrupts Black's position and puts pressure on the knight and bishop.

In the Scandinavian Defense: Portuguese Gambit, Jadoul Variation, Black plays Nbd7 after White's Bb5+ to block the check and develop the knight. By playing Nbd7, Black adds another defender to the pawn on d5 and brings the knight closer to the center of the board. This move also prepares for the castle on the kingside and supports the bishop on f5. Furthermore, the knight on d7 can later initiate an attack on White's position or be used to support Black's pawns in the center. In sum, Nbd7 is a useful move that strengthens Black's position and develops the pieces.

After Black's Nbd7, White plays c4 to gain more control of the center and expand their position. This move supports the pawn on d4 and puts pressure on Black's knight on d7. By playing c4, White also opens up potential lines of attack for their queen, bishop and knight. Moreover, c4 can help White to gain more space on the board, restricting Black's movement and ability to advance their pawns. Despite these potential benefits, playing c4 too quickly can leave the pawn exposed, so this move needs to be done with care. In sum, c4 is a flexible move that is frequently played in many openings, including the Scandinavian Defense.