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In the Ruy Lopez opening, are 4. Ba4 and 4. Bxc6 the only viable moves for the bishop after 3. … a6? - Quora

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Ruy Lopez - Spanish Opening (Theory, Variations, Lines, Strategy) - PPQTY

In the Ruy Lopez chess opening is it always better for the bishop to take the knight creating doubled up pawns? - Quora

Ruy Lopez Main Line: Flear, Glenn: 9781857443516: : Books