Ruy Lopez: Morphy Defense, Modern Steinitz Defense (variation 3)

This opening is a solid defense for Black against the Ruy Lopez, aiming to control the center and develop pieces efficiently.

In this variation, Black opts for a solid pawn structure by playing d6 early on, allowing for the development of the light-squared bishop while maintaining control over the e5 square.

By delaying the typical pawn push to d5, Black aims to avoid potential pawn weaknesses and instead focuses on completing development and preparing for the middlegame.

White's bishop on b5 is forced to retreat after a6, allowing Black to catch up in development and potentially gain a slight initiative.

The move c4 by White aims to control the center and potentially support a future d4 pawn break, challenging Black's central control.

Both sides have solid pawn structures and good piece placement, setting the stage for a strategic battle in the middlegame.

Black can choose to continue developing pieces and preparing for the middlegame, while White may look to expand on the queenside or initiate a central pawn break.

Overall, this variation offers both sides opportunities to play for the initiative and create imbalances on the board.