Studying Ruy Lopez opening. Why is e7 best for Black's bishop, but

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Studying Ruy Lopez opening. Why is e7 best for Black's bishop, but d6 is inaccurate? : r/chessbeginners

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Why does black have a good amount of advantage here? : r/chessbeginners

In these typical Ruy Lopez positions, why is White doing better when Black's bishop has gone to g4 rather than when it's placed more normally on b7 or d7/e6? : r/chess