Chess Puzzles from the Ruy Lopez, Old Steinitz Defense (ECO C62).
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Ruy Lopez - Wikipedia, PDF, Traditional Games
The Project Gutenberg eBook of The Blue Book of Chess, based on the work of Staunton and Modern Authorities.
Ruy Lopez, Old Steinitz Defense (C62), 1-0
Steinitz Defense: World Champion Openings
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The Steinitz Defense Deferred
Chess Kerala
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Chess openings: Ruy Lopez (C60)
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