Best response to the Ruy Lopez: Spanish Countergambit, Harding Countergambit, Fricke Gambit (C60)

1. e4 e5 2. Nf3 Nc6 3. Bb5 d5 4. Nxe5 Qg5 5. O-O · Black to move

What is the best response to the Ruy Lopez: Spanish Countergambit, Harding Countergambit, Fricke Gambit (1. e4 e5 2. Nf3 Nc6 3. Bb5 d5 4. Nxe5 Qg5 5. O-O)? Black to move. See the top replies ranked by opening theory and real-game results.

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