The Lion Variation, Sozin Variation is a variation of the Philidor Defense, catalogued as ECO C41. The line runs 1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nbd7 5. Bc4 Be7 6. O-O O-O 7. Qe2 c6 8. a4 exd4, reaching the position shown below after 16 half-moves.
Both sides have pawns in the centre (White on e4, Black on d4). Development is level at three minor pieces each, and Black is up a pawn of material. It is White to move after eight moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank; Black has doubled pawns on the d-file.
On the Philidor Defense generally: A solid but somewhat passive defense. Black supports e5 with d6 for a strong center.
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The Lion Variation, Sozin Variation goes 1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nbd7 5. Bc4 Be7 6. O-O O-O 7. Qe2 c6 8. a4 exd4. It is a variation of the Philidor Defense and is catalogued as ECO C41.
The Lion Variation, Sozin Variation is ECO C41. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Philidor Defense.
Stockfish evaluates the position after 1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nbd7 5. Bc4 Be7 6. O-O O-O 7. Qe2 c6 8. a4 exd4 at -0.03 at depth 18, which is balanced. 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 e4, Black on d4). Development is level at three minor pieces each, and Black is up a pawn of material. It is White to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank; Black has doubled pawns on the d-file.