The Stoltz Variation is a variation of the Semi-Slav Defense, catalogued as ECO D45. The line runs 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3 Bb7, reaching the position shown below after 14 half-moves.
Both sides have pawns in the centre (White on d4, Black on d5), and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each. It is White to move after seven moves.
On the Semi-Slav Defense generally: A complex defense combining ideas from the Slav and Queen's Gambit Declined.
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The Stoltz Variation goes 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3 Bb7. It is a variation of the Semi-Slav Defense and is catalogued as ECO D45.
The Stoltz Variation is ECO D45. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Semi-Slav Defense.
Stockfish evaluates the position after 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 e6 5. Nf3 Nbd7 6. Qc2 b6 7. b3 Bb7 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, Black on d5), and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each. It is White to move.