What are the differences between 12.d3 and 12.d4 in the Ruy Lopez

What are the differences between 12.d3 and 12.d4 in the Ruy Lopez, Marshall counter-attack? What does white hope to achieve with each? - Quora

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Learn Chess Opening: The Ruy Lopez, by Alfi Futuhi

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Chess Ruy Lopez Most Common Variation Poster for Sale by reenea84

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Frontiers Debates in Pancreatic Beta Cell Biology: Proliferation Versus Progenitor Differentiation and Transdifferentiation in Restoring β Cell Mass

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Chess Opening Secrets Revealed*: Chess: Understanding the Ruy Lopez Opening (Marshall Gambit)

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