The Siroccopteryx Variation is a variation of the Colle System, catalogued as ECO A40. The line runs 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+, reaching the position shown below after 10 half-moves.
The four central squares are empty of pawns, so the fight for them is being conducted by pieces. Development is level at two minor pieces each. It is White to move after five moves.
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 Siroccopteryx Variation goes 1. d4 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+. It is a variation of the Colle System and is catalogued as ECO A40.
The Siroccopteryx Variation is ECO A40. 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 g6 2. Nf3 Bg7 3. e3 c5 4. Bd3 cxd4 5. Nxd4 Qa5+ at +0.11 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.
The four central squares are empty of pawns, so the fight for them is being conducted by pieces. Development is level at two minor pieces each. It is White to move.