Ruy Lopez: Schliemann Defense, Kostić Defense

The Ruy Lopez: Schliemann Defense, Kostić Defense is a chess opening classified under ECO code C63 in the Open Games & French Defense family, beginning with 1.e4 e5 or 1.e4 e6, including the Italian Game, Ruy Lopez, and French Defense. It is reached after 5 moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 Be7. The resulting position leaves white to move.