Ruy Lopez: Morphy Defense, Schliemann Defense Deferred, Jaenisch Gambit Deferred

The Ruy Lopez: Morphy Defense, Schliemann Defense Deferred, Jaenisch Gambit Deferred opening begins with e4 e5, followed by Nf3 and Nc6. In this line, White's third move is Bb5, pinning Black's knight and preparing to castle. Ba4 is then played to defend the bishop and attack the a6 pawn. The move f5 by Black is a common response to sacrifice a pawn in order to gain control of the e4 square and open up lines for the bishop on c8. White responds with exf5, opening the e-file and centralizing the pawns. This move aims to keep control of the center and put pressure on Black's position from the early stages of the game.

Playing e5 in response to e4 is a common and aggressive move by Black in many openings. It opens up the center and creates potential for mobility for Black's pieces. By advancing their pawn to e5, Black also gains control of the d4 square and puts pressure on White's pawn structure. Furthermore, it allows Black's knight to gain more options to move and attack as it clears the way. In summary, playing e5 is a bold move by Black to seize control of the center and gain strategic advantages early in the game.

The move Nf3 by White after the moves 1.e4 e5 is a common and natural development move. It attacks Black's pawn on e5, forcing Black to either move the pawn or defend it with another piece. Nf3 also allows White's knight to be developed to a central square and support control of the center. Additionally, it aims to control key squares such as d4 and e5. Finally, it prepares for the king to castle and connect the rooks. In sum, Nf3 is a strong and flexible move in the opening, as it supports development and control early on.

In the Ruy Lopez: Morphy Defense, Schliemann Defense Deferred, Jaenisch Gambit Deferred, Black usually responds to 2.Nf3 with Nc6. This move aims to develop a piece and fight for control of the center. By placing the knight on c6, Black also prepares to bring their pawn to d5, further increasing their control of the center. Additionally, the knight on c6 attacks White's pawn on e5, preventing White from advancing it without first protecting it with another piece. Therefore, Nc6 is a flexible move that both develops a piece and increases Black's control and influence in the center of the board.

Playing Bb5 in response to 1.e4 e5 2.Nf3 Nc6 is a typical move in many openings, putting pressure on Black's knight and challenging Black's control of the center. This move also prepares for White to castle kingside, developing their king's bishop to an active square and increasing control over the d4 square. Furthermore, Bb5 can force Black's hand by either blocking their pawn or trading off the knight for the bishop, leading to doubled pawns. In sum, Bb5 is a move that puts pressure on Black's position early in the game, creating tactical opportunities and control of the center.

In response to 3.Bb5, Black often plays a6, known as the "Ruy Lopez-Arkhangelsk Variation" or the "Moeller Defense". The move a6 aims to deter White's bishop from occupying the important square on b5 and disrupting Black's pawn structure. It also prepares for Black's own pawn to move to b5, either forcing the bishop to retreat to a4 or giving Black control of the square. By playing a6, Black can also gain more flexibility in their pieces and prevent White from forcing doubled pawns on Black's queenside. In sum, a6 is a flexible move that can create more options and space for Black's pieces while avoiding any potential threats from White's bishop on b5.

In the Ruy Lopez: Morphy Defense, Schliemann Defense Deferred, Jaenisch Gambit Deferred opening, White usually responds to Black's 3...a6 move with Ba4. This move provides protection for the bishop and attacks Black's pawn on a6, putting pressure on Black's queenside. Additionally, Ba4 prepares for White to castle and connect the rooks, giving White an overall safer king position. By playing Ba4, White can also control the b5 square and prevent Black from playing a later b5. In summary, Ba4 is a solid and natural continuation in the Ruy Lopez that both improves White's position and disrupts Black's pawn structure.

In response to 4.Ba4, Black sometimes plays f5, also known as the "Schliemann Defense Deferred". This move aims to challenge White's position and gain control of the center, while also creating potential weaknesses in Black's own position. By advancing the f-pawn, Black aims to gain more space and mobility for their pieces, and put pressure on White's pawn structure. Furthermore, f5 prepares for Black's king's bishop to be developed to f6, putting pressure on White's e5 pawn. However, this move also creates a potential weakness on Black's kingside, as the pawn on f5 may become a target for White's pieces. In summary, f5 is a bold move by Black that aims to gain more control and put pressure on White's position, although it also comes with certain risks.

In the given position, White responds to 4...f5 by playing exf5, known as the "Jaenisch Gambit Deferred". This move aims to open up the center and gain control of the e-file while also attacking Black's f-pawn. By taking with the pawn on f5, White centralizes their pawns and puts pressure on Black's position, forcing Black to make a decision about how to defend the f-pawn. Additionally, exf5 prepares for White's queen to be developed to e2 or d3 with tempo, adding pressure on Black's position. By taking on f5, White also creates an issue with Black's pawn structure that may be exploited later in the game. In sum, exf5 is a dynamic move by White that creates immediate pressure and opportunities to gain control of the center and attack Black's position.