Best response to the Ruy Lopez: Open Berlin Defense, Showalter Variation (C67)

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. Ba4 · Black to move

What is the best response to the Ruy Lopez: Open Berlin Defense, Showalter Variation (1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. d4 Nd6 6. Ba4)? Black to move. See the top replies ranked by opening theory and real-game results.

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