The Anti-Colle, ...Bf5 is a variation of the Colle System, catalogued as ECO A04. The line runs 1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 4. Bd3 e6 5. O-O Bd6, reaching the position shown below after 10 half-moves.
Both sides have pawns in the centre (White on d4, Black on d5). Development is level at two minor pieces each. It is White to move after five moves. White has castled while Black’s king is still uncommitted.
On the Colle System generally: ECO A04. A chess opening with 3 known variations.
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See all 6 Colle System variations →
The Anti-Colle, ...Bf5 goes 1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 4. Bd3 e6 5. O-O Bd6. It is a variation of the Colle System and is catalogued as ECO A04.
The Anti-Colle, ...Bf5 is ECO A04. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Colle System.
Stockfish evaluates the position after 1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 4. Bd3 e6 5. O-O Bd6 at +0.10 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 d4, Black on d5). Development is level at two minor pieces each. It is White to move. White has castled while Black’s king is still uncommitted.