Pterodactyl Defense: Central, Benoni Pterodactyl

1. d4 is a crucial move for White because it helps them occupy the center of the board. 2. By advancing the d-pawn two spaces, White hopes to control the e5 and c5 squares. 3. This can lead to more opportunities for White to develop their pieces and launch effective attacks on Black's king. 4. Additionally, d4 often opens up the diagonal for White's queen to participate in the game. 5. With careful play, White can gain a small advantage in the opening by controlling the center of the board.

1. Black's move g6 is an attempt to control the e4 square. 2. By fianchettoing their bishop, Black hopes to attack White's center pawn with their bishop and knight. 3. Additionally, g6 prepares for a possible kingside castling for Black's king, offering extra protection. 4. This move also aims to discourage White from advancing their e-pawn to e5, which could create a strong central pawn chain. 5. By playing g6, Black is developing their pieces and getting ready to defend their position against any potential attacks from White.

1. White's move c4 is also known as the Queen's Pawn Opening, and it aims to control even more space in the center of the board. 2. By advancing their c-pawn two spaces, White is threatening to create a strong pawn chain with d4. 3. This move also frees up White's dark-squared bishop to attack Black's position. 4. Additionally, c4 creates the possibility of later playing b2-b3, developing White's light-squared bishop and further controlling the c5 square. 5. In sum, c4 helps White build a strong position and gain a spatial advantage over Black.

In the Pterodactyl Defense: Central, Benoni Pterodactyl, Black's move Bg7 is a natural developing move which serves several purposes. Firstly, it completes the fianchetto of Black's king bishop, providing additional defense for the king. Secondly, it puts pressure on White's center by controlling the d4 square, discouraging White from advancing their d-pawn further. Thirdly, it prepares Black for a potential kingside castle, providing a safe haven for the king. In sum, Bg7 helps Black establish a solid position while keeping White's options limited.

The White move e4 is a way to aggressively attack Black's pawn on d5 and seize more space in the center of the board. By advancing their pawn two squares, White can potentially open up their light-squared bishop on c1, aiming at Black's kingside. Additionally, e4 can provide more support to the d5 pawn and prevent Black from advancing their own e pawn. This move also intends to disrupt Black's development and force them to make a difficult decision early in the game. If Black captures the pawn on e4, it will give White the opportunity to recapture with their pawn or develop their knight to d5 with tempo. In sum, e4 is a sharp move that aims to keep Black on their toes and disrupt their plans.

Black's move c5 after White's e4 is a typical response in similar pawn structures. Black wants to challenge White's central pawn with a pawn of their own and try to gain more control in the center. By advancing the c-pawn, Black also hopes to gain more space on the queenside, which can later be used for counterplay or to put pressure on White's position. This move also allows Black to develop their pieces, especially the queen's knight, which can potentially be placed on the c6 square. In sum, c5 is a dynamic move that aims to disrupt White's center and improve Black's position.

In the Pterodactyl Defense: Central, Benoni Pterodactyl, White's move d5 aims to block Black's pawn from advancing to d5 and restrict the mobility of Black's pieces. Additionally, it helps White gain more space in the center of the board and continues to exert pressure on Black's position. If Black captures the pawn on d5, White can follow up with exd5, opening up their light-squared bishop which has potential for active play. This move also creates more support for the e4 pawn, making it more difficult for Black to challenge White's center. In sum, d5 is a sharp move that aims to control the center of the board and create advantageous pawn structures.

Black's move Qa5+ after White's d5 aims to put pressure on White's pawn on d5 by attacking it with the queen. This move also prevents White from gaining control over the c5 square, which can be important for Black's knight development. Additionally, Qa5+ forces White to spend more time and resources defending their position, which can help Black catch up in development. If White responds to Qa5+ with cxd5, Black can recapture with their knight and gain a powerful outpost on the d5 square. In sum, Qa5+ is an aggressive move that aims to create imbalances in the position and put pressure on White's position.