origins: ruy lopez: book iii: main lines after 3 a6

In this volume, the authors cover the main lines of the Closed Ruy Lopez. These lines include: The Marshall Attack, The Anti-Marshall, The Zaitsev Variation, The Breyer Variation, The Chigorin Variation, and a number of minor lines, such as the Bogoljubow Variation, The Smyslov Variation, The Keres Variation and more.
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