The Anderssen Counterattack, Collijn Variation is a variation of the Scandinavian Defense, catalogued as ECO B01. The line runs 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. Nf3 Bg4, reaching the position shown below after 10 half-moves.
Both sides have pawns in the centre (White on d4, Black on e5), 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 five moves.
On the Scandinavian Defense generally: Black immediately challenges White's e4 pawn. Simple to learn but strategically deep.
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The Anderssen Counterattack, Collijn Variation goes 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. Nf3 Bg4. It is a variation of the Scandinavian Defense and is catalogued as ECO B01.
The Anderssen Counterattack, Collijn Variation is ECO B01. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Scandinavian Defense.
Stockfish evaluates the position after 1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 e5 5. Nf3 Bg4 at +1.39 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.
Both sides have pawns in the centre (White on d4, Black on e5), 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.