The Schliemann Defense, Kostić Defense is a variation of the Ruy Lopez, catalogued as ECO C63. The line runs 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 Be7, reaching the position shown below after 10 half-moves.
Black holds the centre with pawns on e5. Development is level at three minor pieces each. It is White to move after five moves.
On the Ruy Lopez generally: One of the oldest and most classical openings. White develops rapidly and puts pressure on Black's center.
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The Schliemann Defense, Kostić Defense goes 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 Be7. It is a variation of the Ruy Lopez and is catalogued as ECO C63.
The Schliemann Defense, Kostić Defense is ECO C63. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Ruy Lopez.
Stockfish evaluates the position after 1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 fxe4 5. Nxe4 Be7 at +1.06 at depth 18, which is a small but real edge for White. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
Black holds the centre with pawns on e5. Development is level at three minor pieces each. It is White to move.