Ruy López' Analysis of the Ruy López Opening

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The Ruy López (also called the Spanish Opening) is one of the oldest and most famous openings in chess history, named after Ruy López because of his analysis of this opening in his 1561 book. The photo above shows this original analysis.

Roughly translated: The white king's pawn moves two. If black plays the king's pawn two, white plays the king's knight to the 3rd square of the bishop, over the pawn. If black guards by playing the queen's knight to the 3rd square of the bishop: white plays the king's bishop to the 4th square of the aforementioned black Queen's knight.