The Closed, Bogoljubow Variation is a variation of the Ruy Lopez, catalogued as ECO C91. The line runs 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. d4 Bg4, reaching the position shown below after 18 half-moves.
Both sides have pawns in the centre (White on d4 and e4, Black on e5), and one pawn capture is available, so the structure has not settled yet. Black is ahead in development, with four minor pieces out to White's two. It is White to move after nine moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.
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 Closed, Bogoljubow Variation goes 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. d4 Bg4. It is a variation of the Ruy Lopez and is catalogued as ECO C91.
The Closed, Bogoljubow Variation is ECO C91. 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 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. d4 Bg4 at +0.29 at depth 18, which is a slight pull for White, within normal opening margins. 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.
Both sides have pawns in the centre (White on d4 and e4, Black on e5), and one pawn capture is available, so the structure has not settled yet. Black is ahead in development, with four minor pieces out to White's two. It is White to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.