Queen's Indian Defense: Classical Variation, Polugaevsky Gambit

The opening begins with the move 1. d4, which is played by white. This move helps white to control the center of the board and frees the c1 bishop. It also enables white to develop the queen's knight to f3 to support the center control. By playing d4, white increases the pressure on the black pawn on d5, which is a key pawn for black's center control. In sum, this opening is a strong choice for white to gain initial dominance on the board and to create a strong foundation for further development.

After the move 1. d4 by white, Black responds with Nf6. This move aims to control the central squares on the board and prepares for the development of the kingside pieces. The knight also supports the pawn on d5, which is crucial for Black's central control. In addition, the move Nf6 allows Black to potentially attack the White pawn on e4 using the bishop. In sum, Nf6 is a good response by Black to gain control over the center and to prepare for further development.

After the moves 1. d4 Nf6, White intends to play c4 to control more space in the center and to potentially support the d4 pawn with the c3 pawn. The move also allows White to develop the queen's bishop and opens up lines for the queen to control the center. Playing c4 puts pressure on the black knight on f6 and reduces its mobility, which can limit Black's options for development. In sum, c4 is a strong move that improves White's position and increases the pressure on Black.

In the Queen's Indian Defense: Classical Variation, Polugaevsky Gambit, after the moves 1. d4 Nf6 2. c4, Black usually plays e6. This move supports the pawn on d5 and helps Black to control the central squares by limiting the scope of the White bishop. Moreover, e6 prepares for the development of the bishop on b7, which will add further control to the central squares. Playing e6 also maintains some tension within the position, keeping the possibility of a pawn break with d5 open. In sum, this move is a solid and flexible option for Black that allows for a range of possible variations arising from the opening.

After the moves 1. d4 Nf6 2. c4 e6, White usually responds with Nf3. This move prepares to further control the center of the board by supporting the pawn on d4 and attacking the pawn on e5. By playing Nf3, White also opens up the possibility of developing the bishop to g5, which can pin the Black knight on f6 and limit Black's development. The knight on f3 also has the potential to move to g5 or e5 to increase the pressure on Black's position. In sum, Nf3 is a solid and versatile move for White that supports many different pawn structures and variations in the opening.

After the moves 1. d4 Nf6 2. c4 e6 3. Nf3, Black often plays b6. This move prepares to develop the bishop on the long diagonal to b7, which will give Black added control over the central squares. Playing b6 also supports the pawn on d5 and prepares for the possibility of a future pawn break by c5. Moreover, b6 prevents the development of the White knight to c3, which can limit White's options for development. In sum, this move is a solid and flexible option for Black that prepares for further development and maintains control of critical squares.

In the Queen's Indian Defense: Classical Variation, Polugaevsky Gambit, after the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6, White often plays g3. This move prepares to develop the bishop on the kingside to g2 and fianchetto it. The bishop on g2 will control the long diagonal and support the pawn on d4, helping to maintain central control. Playing g3 also prepares for the possibility of castling kingside, allowing White's king to find safety and potentially improving the coordination of White's pieces. In sum, this move is a solid and flexible option for White that prepares for further development and stability in the position.

After the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3, Black usually plays Bb7. This move develops the bishop on the long diagonal, putting pressure on the central squares in the position. The bishop on b7 also supports the pawn on d5, helping Black to maintain central control. In addition, playing Bb7 prepares for the possibility of castling queenside, which can improve the king's safety and increase the coordination of Black's pieces. Moving the bishop to b7 also eliminates any potential for pinning the knight on f6 by a future White bishop on g2. In sum, this move is a solid and flexible option for Black that develops a piece, supports central control, and prepares for further development.

After the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7, White usually plays Bg2. This move completes the fianchetto of the bishop on the kingside, which will control the long diagonal and support the pawn on d4. The bishop on g2 also helps to maintain central control and can potentially support a future kingside attack. Moreover, Bg2 allows White to castle kingside and improve the safety of the king. By placing the bishop on g2, White also puts pressure on the d5 pawn, which is a crucial pawn for Black's central control. In sum, this move is a logical and strong continuation of developing White's pieces and putting pressure on Black.

In the Queen's Indian Defense: Classical Variation, Polugaevsky Gambit, after the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2, Black often plays Be7. This move develops the bishop and supports the pawn on d5. The bishop on e7 also puts pressure on the pawn on d4, which can limit White's options for central control. Additionally, Be7 prepares for the potential of castling kingside, which can improve Black's king safety and increase the coordination of Black's pieces. In sum, this move is a solid and flexible option for Black that develops a piece, supports central control, and prepares for further development.

After the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7, White usually castles kingside with O-O. This move brings the king to safety and connects the rooks, which can improve the coordination of White's pieces. Additionally, castling makes it easier for White to put pressure on the center of the board and potentially support an attack on the Black position. The move also frees the rook on h1, which can be used to potentially control the open h-file or support the g-pawn in a future kingside attack. In sum, this is a standard move in the opening that allows White to develop their pieces and prepare for further play.

After the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O, Black usually castles kingside with O-O. This move helps to connect the rooks and improve the safety of the king. Additionally, castling can increase the flexibility of Black's pieces and can help to maintain central control. The move also prepares for the potential of a rook lift to the g-file, which can be used to support an attack on White's position. In sum, this is a standard move in the opening that allows Black to develop their pieces and prepare for further play.

In the Queen's Indian Defense: Classical Variation, Polugaevsky Gambit, after the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O, White often plays d5. This move aims to establish a strong pawn center and gain more space on the board. Furthermore, d5 can force the Black knight on f6 to move, which can disrupt Black's piece coordination and limit their options for development. Playing d5 also opens up a diagonal for the White bishop on g2 and can help to create potential attacking chances on the kingside. In sum, this move is a strong and aggressive continuation by White that aims to gain more control of the board and create potential threats against Black.

After the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. d5, Black often captures the pawn with exd5. This move opens up lines for Black's pieces and helps in controlling the center of the board. Furthermore, the captured pawn on d5 was blocking Black's bishop on c8. By advancing the pawn to d5, White has weakened their own pawn structure, creating potential vulnerabilities and targets for Black to exploit. Capturing the pawn also creates an open file for Black's rook on the d-file, which can be used in conjunction with the bishop and queen to potentially put pressure on White's position. In sum, exd5 is a solid move for Black that gains central control and creates potential tactical opportunities.

After the moves 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. d5 exd5, White often plays Nh4. This move is a tactical idea to put pressure on the Black queen and gain greater control over the center of the board. By attacking the queen, White may force Black to move their queen to a less preferred square, potentially disrupting the coordination of Black's pieces. Additionally, the knight on h4 eyes the f5 square, which if occupied, can lead to further pressure on the Black position. Nh4 may also be played to prepare for a future kingside attack if the position merits it. In sum, this move is a strong and aggressive continuation by White that aims to gain greater control of the board and create potential threats against Black.